src/tweak-context.cpp

   1 #define __SP_TWEAK_CONTEXT_C__
   2
   3 /*
   4  * tweaking paths without node editing
   5  *
   6  * Authors:
   7  *   bulia byak
   8  *
   9  * Copyright (C) 2007 authors
  10  *
  11  * Released under GNU GPL, read the file 'COPYING' for more information
  12  */
  13
  14 #include "config.h"
  15
  16 #include <gtk/gtk.h>
  17 #include <gdk/gdkkeysyms.h>
  18 #include <glibmm/i18n.h>
  19
  20 #include <numeric>
  21
  22 #include "svg/svg.h"
  23 #include "display/canvas-bpath.h"
  24 #include "display/bezier-utils.h"
  25
  26 #include <glib/gmem.h>
  27 #include "macros.h"
  28 #include "document.h"
  29 #include "selection.h"
  30 #include "desktop.h"
  31 #include "desktop-events.h"
  32 #include "desktop-handles.h"
  33 #include "desktop-affine.h"
  34 #include "desktop-style.h"
  35 #include "message-context.h"
  36 #include "pixmaps/cursor-thin.xpm"
  37 #include "pixmaps/cursor-thicken.xpm"
  38 #include "pixmaps/cursor-attract.xpm"
  39 #include "pixmaps/cursor-repel.xpm"
  40 #include "pixmaps/cursor-push.xpm"
  41 #include "pixmaps/cursor-roughen.xpm"
  42 #include "pixmaps/cursor-color.xpm"
  43 #include "libnr/n-art-bpath.h"
  44 #include "libnr/nr-path.h"
  45 #include "libnr/nr-maybe.h"
  46 #include "libnr/nr-matrix-ops.h"
  47 #include "libnr/nr-scale-translate-ops.h"
  48 #include "xml/repr.h"
  49 #include "context-fns.h"
  50 #include "sp-item.h"
  51 #include "inkscape.h"
  52 #include "color.h"
  53 #include "svg/svg-color.h"
  54 #include "splivarot.h"
  55 #include "sp-item-group.h"
  56 #include "sp-shape.h"
  57 #include "sp-path.h"
  58 #include "path-chemistry.h"
  59 #include "sp-gradient.h"
  60 #include "sp-stop.h"
  61 #include "sp-stop-fns.h"
  62 #include "sp-gradient-reference.h"
  63 #include "sp-linear-gradient.h"
  64 #include "sp-radial-gradient.h"
  65 #include "gradient-chemistry.h"
  66 #include "sp-text.h"
  67 #include "sp-flowtext.h"
  68 #include "display/canvas-bpath.h"
  69 #include "display/canvas-arena.h"
  70 #include "livarot/Shape.h"
  71 #include "isnan.h"
  72 #include "prefs-utils.h"
  73 #include "style.h"
  74 #include "box3d.h"
  75
  76 #include "tweak-context.h"
  77
  78 #define DDC_RED_RGBA 0xff0000ff
  79
  80 #define DYNA_MIN_WIDTH 1.0e-6
  81
  82 // FIXME: move it to some shared file to be reused by both calligraphy and dropper
  83 #define C1 0.552
  84 static NArtBpath const hatch_area_circle[] = {
  85     { NR_MOVETO, 0, 0, 0, 0, -1, 0 },
  86     { NR_CURVETO, -1, C1, -C1, 1, 0, 1 },
  87     { NR_CURVETO, C1, 1, 1, C1, 1, 0 },
  88     { NR_CURVETO, 1, -C1, C1, -1, 0, -1 },
  89     { NR_CURVETO, -C1, -1, -1, -C1, -1, 0 },
  90     { NR_END, 0, 0, 0, 0, 0, 0 }
  91 };
  92 #undef C1
  93
  94
  95 static void sp_tweak_context_class_init(SPTweakContextClass *klass);
  96 static void sp_tweak_context_init(SPTweakContext *ddc);
  97 static void sp_tweak_context_dispose(GObject *object);
  98
  99 static void sp_tweak_context_setup(SPEventContext *ec);
 100 static void sp_tweak_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
 101 static gint sp_tweak_context_root_handler(SPEventContext *ec, GdkEvent *event);
 102
 103 static SPEventContextClass *parent_class;
 104
 105 GtkType
 106 sp_tweak_context_get_type(void)
 107 {
 108     static GType type = 0;
 109     if (!type) {
 110         GTypeInfo info = {
 111             sizeof(SPTweakContextClass),
 112             NULL, NULL,
 113             (GClassInitFunc) sp_tweak_context_class_init,
 114             NULL, NULL,
 115             sizeof(SPTweakContext),
 116             4,
 117             (GInstanceInitFunc) sp_tweak_context_init,
 118             NULL,   /* value_table */
 119         };
 120         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPTweakContext", &info, (GTypeFlags)0);
 121     }
 122     return type;
 123 }
 124
 125 static void
 126 sp_tweak_context_class_init(SPTweakContextClass *klass)
 127 {
 128     GObjectClass *object_class = (GObjectClass *) klass;
 129     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
 130
 131     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 132
 133     object_class->dispose = sp_tweak_context_dispose;
 134
 135     event_context_class->setup = sp_tweak_context_setup;
 136     event_context_class->set = sp_tweak_context_set;
 137     event_context_class->root_handler = sp_tweak_context_root_handler;
 138 }
 139
 140 static void
 141 sp_tweak_context_init(SPTweakContext *tc)
 142 {
 143     SPEventContext *event_context = SP_EVENT_CONTEXT(tc);
 144
 145     event_context->cursor_shape = cursor_push_xpm;
 146     event_context->hot_x = 4;
 147     event_context->hot_y = 4;
 148
 149     /* attributes */
 150     tc->dragging = FALSE;
 151
 152     tc->width = 0.2;
 153     tc->force = 0.2;
 154     tc->pressure = TC_DEFAULT_PRESSURE;
 155
 156     tc->is_dilating = false;
 157     tc->has_dilated = false;
 158
 159     tc->do_h = true;
 160     tc->do_s = true;
 161     tc->do_l = true;
 162     tc->do_o = false;
 163
 164     new (&tc->style_set_connection) sigc::connection();
 165 }
 166
 167 static void
 168 sp_tweak_context_dispose(GObject *object)
 169 {
 170     SPTweakContext *tc = SP_TWEAK_CONTEXT(object);
 171
 172     tc->style_set_connection.disconnect();
 173     tc->style_set_connection.~connection();
 174
 175     if (tc->dilate_area) {
 176         gtk_object_destroy(GTK_OBJECT(tc->dilate_area));
 177         tc->dilate_area = NULL;
 178     }
 179
 180     if (tc->_message_context) {
 181         delete tc->_message_context;
 182     }
 183
 184     G_OBJECT_CLASS(parent_class)->dispose(object);
 185 }
 186
 187 void
 188 sp_tweak_update_cursor (SPTweakContext *tc, gint mode)
 189 {
 190     SPEventContext *event_context = SP_EVENT_CONTEXT(tc);
 191    switch (mode) {
 192        case TWEAK_MODE_PUSH:
 193            event_context->cursor_shape = cursor_push_xpm;
 194            break;
 195        case TWEAK_MODE_SHRINK:
 196            event_context->cursor_shape = cursor_thin_xpm;
 197            break;
 198        case TWEAK_MODE_GROW:
 199            event_context->cursor_shape = cursor_thicken_xpm;
 200            break;
 201        case TWEAK_MODE_ATTRACT:
 202            event_context->cursor_shape = cursor_attract_xpm;
 203            break;
 204        case TWEAK_MODE_REPEL:
 205            event_context->cursor_shape = cursor_repel_xpm;
 206            break;
 207        case TWEAK_MODE_ROUGHEN:
 208            event_context->cursor_shape = cursor_roughen_xpm;
 209            break;
 210        case TWEAK_MODE_COLORPAINT:
 211        case TWEAK_MODE_COLORJITTER:
 212            event_context->cursor_shape = cursor_color_xpm;
 213            break;
 214    }
 215    sp_event_context_update_cursor(event_context);
 216 }
 217
 218 static bool
 219 sp_tweak_context_style_set(SPCSSAttr const *css, SPTweakContext *tc)
 220 {
 221     if (tc->mode == TWEAK_MODE_COLORPAINT) { // intercept color setting only in this mode
 222         // we cannot store properties with uris
 223         css = sp_css_attr_unset_uris ((SPCSSAttr *) css);
 224
 225         sp_repr_css_change (inkscape_get_repr (INKSCAPE, "tools.tweak"), (SPCSSAttr *) css, "style");
 226
 227         return true;
 228     }
 229     return false;
 230 }
 231
 232
 233 static void
 234 sp_tweak_context_setup(SPEventContext *ec)
 235 {
 236     SPTweakContext *tc = SP_TWEAK_CONTEXT(ec);
 237
 238     if (((SPEventContextClass *) parent_class)->setup)
 239         ((SPEventContextClass *) parent_class)->setup(ec);
 240
 241     {
 242         SPCurve *c = sp_curve_new_from_foreign_bpath(hatch_area_circle);
 243         tc->dilate_area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c);
 244         sp_curve_unref(c);
 245         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(tc->dilate_area), 0x00000000,(SPWindRule)0);
 246         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(tc->dilate_area), 0xff9900ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 247         sp_canvas_item_hide(tc->dilate_area);
 248     }
 249
 250     sp_event_context_read(ec, "width");
 251     sp_event_context_read(ec, "mode");
 252     sp_event_context_read(ec, "fidelity");
 253     sp_event_context_read(ec, "force");
 254     sp_event_context_read(ec, "usepressure");
 255     sp_event_context_read(ec, "doh");
 256     sp_event_context_read(ec, "dol");
 257     sp_event_context_read(ec, "dos");
 258     sp_event_context_read(ec, "doo");
 259
 260     tc->is_drawing = false;
 261
 262     tc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 263
 264     tc->style_set_connection = ec->desktop->connectSetStyle( // catch style-setting signal in this tool
 265         sigc::bind(sigc::ptr_fun(&sp_tweak_context_style_set), tc)
 266     );
 267 }
 268
 269 static void
 270 sp_tweak_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 271 {
 272     SPTweakContext *tc = SP_TWEAK_CONTEXT(ec);
 273
 274     if (!strcmp(key, "width")) {
 275         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
 276         tc->width = CLAMP(dval, -1000.0, 1000.0);
 277     } else if (!strcmp(key, "mode")) {
 278         gint64 const dval = ( val ? g_ascii_strtoll (val, NULL, 10) : 0 );
 279         tc->mode = dval;
 280         sp_tweak_update_cursor(tc, tc->mode);
 281     } else if (!strcmp(key, "fidelity")) {
 282         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
 283         tc->fidelity = CLAMP(dval, 0.0, 1.0);
 284     } else if (!strcmp(key, "force")) {
 285         double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
 286         tc->force = CLAMP(dval, 0, 1.0);
 287     } else if (!strcmp(key, "usepressure")) {
 288         tc->usepressure = (val && strcmp(val, "0"));
 289     } else if (!strcmp(key, "doh")) {
 290         tc->do_h = (val && strcmp(val, "0"));
 291     } else if (!strcmp(key, "dos")) {
 292         tc->do_s = (val && strcmp(val, "0"));
 293     } else if (!strcmp(key, "dol")) {
 294         tc->do_l = (val && strcmp(val, "0"));
 295     } else if (!strcmp(key, "doo")) {
 296         tc->do_o = (val && strcmp(val, "0"));
 297     }
 298 }
 299
 300 static void
 301 sp_tweak_extinput(SPTweakContext *tc, GdkEvent *event)
 302 {
 303     if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &tc->pressure))
 304         tc->pressure = CLAMP (tc->pressure, TC_MIN_PRESSURE, TC_MAX_PRESSURE);
 305     else
 306         tc->pressure = TC_DEFAULT_PRESSURE;
 307 }
 308
 309 double
 310 get_dilate_radius (SPTweakContext *tc)
 311 {
 312     // 10 times the pen width:
 313     return 500 * tc->width/SP_EVENT_CONTEXT(tc)->desktop->current_zoom();
 314 }
 315
 316 double
 317 get_dilate_force (SPTweakContext *tc)
 318 {
 319     double force = 8 * (tc->usepressure? tc->pressure : TC_DEFAULT_PRESSURE)
 320         /sqrt(SP_EVENT_CONTEXT(tc)->desktop->current_zoom());
 321     if (force > 3) {
 322         force += 4 * (force - 3);
 323     }
 324     return force * tc->force;
 325 }
 326
 327 bool
 328 sp_tweak_dilate_recursive (Inkscape::Selection *selection, SPItem *item, NR::Point p, NR::Point vector, gint mode, double radius, double force, double fidelity)
 329 {
 330     bool did = false;
 331
 332     if (SP_IS_GROUP(item)) {
 333         for (SPObject *child = sp_object_first_child(SP_OBJECT(item)) ; child != NULL; child = SP_OBJECT_NEXT(child) ) {
 334             if (SP_IS_ITEM(child)) {
 335                 if (sp_tweak_dilate_recursive (selection, SP_ITEM(child), p, vector, mode, radius, force, fidelity))
 336                     did = true;
 337             }
 338         }
 339
 340     } else if (SP_IS_PATH(item) || SP_IS_SHAPE(item) || SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
 341
 342         Inkscape::XML::Node *newrepr = NULL;
 343         gint pos = 0;
 344         Inkscape::XML::Node *parent = NULL;
 345         char const *id = NULL;
 346         if (!SP_IS_PATH(item)) {
 347             newrepr = sp_selected_item_to_curved_repr(item, 0);
 348             if (!newrepr)
 349                 return false;
 350
 351             // remember the position of the item
 352             pos = SP_OBJECT_REPR(item)->position();
 353             // remember parent
 354             parent = SP_OBJECT_REPR(item)->parent();
 355             // remember id
 356             id = SP_OBJECT_REPR(item)->attribute("id");
 357         }
 358
 359
 360         // skip those paths whose bboxes are entirely out of reach with our radius
 361         NR::Maybe<NR::Rect> bbox = item->getBounds(sp_item_i2doc_affine(item));
 362         if (bbox) {
 363             bbox->growBy(radius);
 364             if (!bbox->contains(p)) {
 365                 return false;
 366             }
 367         }
 368
 369         Path *orig = Path_for_item(item, false);
 370         if (orig == NULL) {
 371             return false;
 372         }
 373
 374         Path *res = new Path;
 375         res->SetBackData(false);
 376
 377         Shape *theShape = new Shape;
 378         Shape *theRes = new Shape;
 379
 380         orig->ConvertWithBackData(0.08 - (0.07 * fidelity)); // default 0.059
 381         orig->Fill(theShape, 0);
 382
 383         SPCSSAttr *css = sp_repr_css_attr(SP_OBJECT_REPR(item), "style");
 384         gchar const *val = sp_repr_css_property(css, "fill-rule", NULL);
 385         if (val && strcmp(val, "nonzero") == 0)
 386         {
 387             theRes->ConvertToShape(theShape, fill_nonZero);
 388         }
 389         else if (val && strcmp(val, "evenodd") == 0)
 390         {
 391             theRes->ConvertToShape(theShape, fill_oddEven);
 392         }
 393         else
 394         {
 395             theRes->ConvertToShape(theShape, fill_nonZero);
 396         }
 397
 398         if (NR::L2(vector) != 0)
 399             vector = 1/NR::L2(vector) * vector;
 400
 401         bool did_this = false;
 402         NR::Matrix i2doc(sp_item_i2doc_affine(item));
 403         if (mode == TWEAK_MODE_SHRINK || mode == TWEAK_MODE_GROW) {
 404             if (theShape->MakeTweak(tweak_mode_grow, theRes,
 405                                  mode == TWEAK_MODE_GROW? force : -force,
 406                                  join_straight, 4.0,
 407                                  true, p, NR::Point(0,0), radius, &i2doc) == 0) // 0 means the shape was actually changed
 408               did_this = true;
 409         } else if (mode == TWEAK_MODE_ATTRACT || mode == TWEAK_MODE_REPEL) {
 410             if (theShape->MakeTweak(tweak_mode_repel, theRes,
 411                                  mode == TWEAK_MODE_REPEL? force : -force,
 412                                  join_straight, 4.0,
 413                                  true, p, NR::Point(0,0), radius, &i2doc) == 0)
 414               did_this = true;
 415         } else if (mode == TWEAK_MODE_PUSH) {
 416             if (theShape->MakeTweak(tweak_mode_push, theRes,
 417                                  0,
 418                                  join_straight, 4.0,
 419                                  true, p, force*2*vector, radius, &i2doc) == 0)
 420               did_this = true;
 421         } else if (mode == TWEAK_MODE_ROUGHEN) {
 422             if (theShape->MakeTweak(tweak_mode_roughen, theRes,
 423                                  force,
 424                                  join_straight, 4.0,
 425                                  true, p, NR::Point(0,0), radius, &i2doc) == 0)
 426               did_this = true;
 427         }
 428
 429         // the rest only makes sense if we actually changed the path
 430         if (did_this) {
 431             theRes->ConvertToShape(theShape, fill_positive);
 432
 433             res->Reset();
 434             theRes->ConvertToForme(res);
 435
 436             double th_max = 0.6 - 0.59*sqrt(fidelity);
 437             double threshold = MAX(th_max, th_max*force);
 438             res->ConvertEvenLines(threshold);
 439             res->Simplify(threshold);
 440
 441             if (newrepr) { // converting to path, need to replace the repr
 442                 bool is_selected = selection->includes(item);
 443                 if (is_selected)
 444                     selection->remove(item);
 445
 446                 // It's going to resurrect, so we delete without notifying listeners.
 447                 SP_OBJECT(item)->deleteObject(false);
 448
 449                 // restore id
 450                 newrepr->setAttribute("id", id);
 451                 // add the new repr to the parent
 452                 parent->appendChild(newrepr);
 453                 // move to the saved position
 454                 newrepr->setPosition(pos > 0 ? pos : 0);
 455
 456                 if (is_selected)
 457                     selection->add(newrepr);
 458             }
 459
 460             if (res->descr_cmd.size() > 1) {
 461                 gchar *str = res->svg_dump_path();
 462                 if (newrepr) {
 463                     newrepr->setAttribute("d", str);
 464                 } else {
 465                     if (SP_IS_SHAPE(item) && SP_SHAPE(item)->path_effect_href) {
 466                         SP_OBJECT_REPR(item)->setAttribute("inkscape:original-d", str);
 467                     } else {
 468                         SP_OBJECT_REPR(item)->setAttribute("d", str);
 469                     }
 470                 }
 471                 g_free(str);
 472             } else {
 473                 // TODO: if there's 0 or 1 node left, delete this path altogether
 474             }
 475
 476             if (newrepr) {
 477                 Inkscape::GC::release(newrepr);
 478                 newrepr = NULL;
 479             }
 480         }
 481
 482         delete theShape;
 483         delete theRes;
 484         delete orig;
 485         delete res;
 486
 487         if (did_this)
 488             did = true;
 489     }
 490
 491     return did;
 492 }
 493
 494 void
 495 tweak_colorpaint (float *color, guint32 goal, double force, bool do_h, bool do_s, bool do_l)
 496 {
 497     float rgb_g[3];
 498
 499     if (!do_h || !do_s || !do_l) {
 500         float hsl_g[3];
 501         sp_color_rgb_to_hsl_floatv (hsl_g, SP_RGBA32_R_F(goal), SP_RGBA32_G_F(goal), SP_RGBA32_B_F(goal));
 502         float hsl_c[3];
 503         sp_color_rgb_to_hsl_floatv (hsl_c, color[0], color[1], color[2]);
 504         if (!do_h)
 505             hsl_g[0] = hsl_c[0];
 506         if (!do_s)
 507             hsl_g[1] = hsl_c[1];
 508         if (!do_l)
 509             hsl_g[2] = hsl_c[2];
 510         sp_color_hsl_to_rgb_floatv (rgb_g, hsl_g[0], hsl_g[1], hsl_g[2]);
 511     } else {
 512         rgb_g[0] = SP_RGBA32_R_F(goal);
 513         rgb_g[1] = SP_RGBA32_G_F(goal);
 514         rgb_g[2] = SP_RGBA32_B_F(goal);
 515     }
 516
 517     for (int i = 0; i < 3; i++) {
 518         double d = rgb_g[i] - color[i];
 519         color[i] += d * force;
 520     }
 521 }
 522
 523 void
 524 tweak_colorjitter (float *color, double force, bool do_h, bool do_s, bool do_l)
 525 {
 526     float hsl_c[3];
 527     sp_color_rgb_to_hsl_floatv (hsl_c, color[0], color[1], color[2]);
 528
 529     if (do_h) {
 530         hsl_c[0] += g_random_double_range(-0.5, 0.5) * force;
 531         if (hsl_c[0] > 1)
 532             hsl_c[0] -= 1;
 533         if (hsl_c[0] < 0)
 534             hsl_c[0] += 1;
 535     }
 536     if (do_s) {
 537         hsl_c[1] += g_random_double_range(-hsl_c[1], 1 - hsl_c[1]) * force;
 538     }
 539     if (do_l) {
 540         hsl_c[2] += g_random_double_range(-hsl_c[2], 1 - hsl_c[2]) * force;
 541     }
 542
 543     sp_color_hsl_to_rgb_floatv (color, hsl_c[0], hsl_c[1], hsl_c[2]);
 544 }
 545
 546 void
 547 tweak_color (guint mode, float *color, guint32 goal, double force, bool do_h, bool do_s, bool do_l)
 548 {
 549     if (mode == TWEAK_MODE_COLORPAINT) {
 550         tweak_colorpaint (color, goal, force, do_h, do_s, do_l);
 551     } else if (mode == TWEAK_MODE_COLORJITTER) {
 552         tweak_colorjitter (color, force, do_h, do_s, do_l);
 553     }
 554 }
 555
 556 void
 557 tweak_opacity (guint mode, SPIScale24 *style_opacity, double opacity_goal, double force)
 558 {
 559     double opacity = SP_SCALE24_TO_FLOAT (style_opacity->value);
 560
 561     if (mode == TWEAK_MODE_COLORPAINT) {
 562         double d = opacity_goal - opacity;
 563         opacity += d * force;
 564     } else if (mode == TWEAK_MODE_COLORJITTER) {
 565         opacity += g_random_double_range(-opacity, 1 - opacity) * force;
 566     }
 567
 568     style_opacity->value = SP_SCALE24_FROM_FLOAT(opacity);
 569 }
 570
 571
 572 double
 573 tweak_profile (double dist, double radius)
 574 {
 575     if (radius == 0)
 576         return 0;
 577     double x = dist / radius;
 578     double alpha = 1;
 579     if (x >= 1) {
 580         return 0;
 581     } else if (x <= 0) {
 582         return 1;
 583     } else {
 584         return (0.5 * cos (M_PI * (pow(x, alpha))) + 0.5);
 585     }
 586 }
 587
 588 void
 589 tweak_colors_in_gradient (SPItem *item, bool fill_or_stroke,
 590                           guint32 const rgb_goal, NR::Point p_w, double radius, double force, guint mode,
 591                           bool do_h, bool do_s, bool do_l, bool /*do_o*/)
 592 {
 593     SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
 594
 595     if (!gradient || !SP_IS_GRADIENT(gradient))
 596         return;
 597
 598     NR::Matrix i2d = sp_item_i2doc_affine (item);
 599     NR::Point p = p_w * i2d.inverse();
 600     p *= (gradient->gradientTransform).inverse();
 601     // now p is in gradient's original coordinates
 602
 603     double pos = 0;
 604     double r = 0;
 605     if (SP_IS_LINEARGRADIENT(gradient)) {
 606         SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
 607
 608         NR::Point p1(lg->x1.computed, lg->y1.computed);
 609         NR::Point p2(lg->x2.computed, lg->y2.computed);
 610         NR::Point pdiff(p2 - p1);
 611         double vl = NR::L2(pdiff);
 612
 613         // This is the matrix which moves and rotates the gradient line
 614         // so it's oriented along the X axis:
 615         NR::Matrix norm = NR::Matrix(NR::translate(-p1)) * NR::Matrix(NR::rotate(-atan2(pdiff[NR::Y], pdiff[NR::X])));
 616
 617         // Transform the mouse point by it to find out its projection onto the gradient line:
 618         NR::Point pnorm = p * norm;
 619
 620         // Scale its X coordinate to match the length of the gradient line:
 621         pos = pnorm[NR::X] / vl;
 622         // Calculate radius in lenfth-of-gradient-line units
 623         r = radius / vl;
 624
 625     } else if (SP_IS_RADIALGRADIENT(gradient)) {
 626         SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
 627         NR::Point c (rg->cx.computed, rg->cy.computed);
 628         pos = NR::L2(p - c) / rg->r.computed;
 629         r = radius / rg->r.computed;
 630     }
 631
 632     // Normalize pos to 0..1, taking into accound gradient spread:
 633     double pos_e = pos;
 634     if (gradient->spread == SP_GRADIENT_SPREAD_PAD) {
 635         if (pos > 1)
 636             pos_e = 1;
 637         if (pos < 0)
 638             pos_e = 0;
 639     } else if (gradient->spread == SP_GRADIENT_SPREAD_REPEAT) {
 640         if (pos > 1 || pos < 0)
 641             pos_e = pos - floor(pos);
 642     } else if (gradient->spread == SP_GRADIENT_SPREAD_REFLECT) {
 643         if (pos > 1 || pos < 0) {
 644             bool odd = ((int)(floor(pos)) % 2 == 1);
 645             pos_e = pos - floor(pos);
 646             if (odd)
 647                 pos_e = 1 - pos_e;
 648         }
 649     }
 650
 651     SPGradient *vector = sp_gradient_get_forked_vector_if_necessary(gradient, false);
 652
 653     double offset_l = 0;
 654     double offset_h = 0;
 655     SPObject *child_prev = NULL;
 656     for (SPObject *child = sp_object_first_child(vector);
 657          child != NULL; child = SP_OBJECT_NEXT(child)) {
 658         if (!SP_IS_STOP(child))
 659             continue;
 660         SPStop *stop = SP_STOP (child);
 661
 662         offset_h = stop->offset;
 663
 664         if (child_prev) {
 665
 666             if (offset_h - offset_l > r && pos_e >= offset_l && pos_e <= offset_h) {
 667                 // the summit falls in this interstop, and the radius is small,
 668                 // so it only affects the ends of this interstop;
 669                 // distribute the force between the two endstops so that they
 670                 // get all the painting even if they are not touched by the brush
 671                 tweak_color (mode, stop->specified_color.v.c, rgb_goal,
 672                                   force * (pos_e - offset_l) / (offset_h - offset_l),
 673                                   do_h, do_s, do_l);
 674                 tweak_color (mode, SP_STOP(child_prev)->specified_color.v.c, rgb_goal,
 675                                   force * (offset_h - pos_e) / (offset_h - offset_l),
 676                                   do_h, do_s, do_l);
 677                 SP_OBJECT(stop)->updateRepr();
 678                 child_prev->updateRepr();
 679                 break;
 680             } else {
 681                 // wide brush, may affect more than 2 stops,
 682                 // paint each stop by the force from the profile curve
 683                 if (offset_l <= pos_e && offset_l > pos_e - r) {
 684                     tweak_color (mode, SP_STOP(child_prev)->specified_color.v.c, rgb_goal,
 685                                  force * tweak_profile (fabs (pos_e - offset_l), r),
 686                                  do_h, do_s, do_l);
 687                     child_prev->updateRepr();
 688                 }
 689
 690                 if (offset_h >= pos_e && offset_h < pos_e + r) {
 691                     tweak_color (mode, stop->specified_color.v.c, rgb_goal,
 692                                  force * tweak_profile (fabs (pos_e - offset_h), r),
 693                                  do_h, do_s, do_l);
 694                     SP_OBJECT(stop)->updateRepr();
 695                 }
 696             }
 697         }
 698
 699         offset_l = offset_h;
 700         child_prev = child;
 701     }
 702 }
 703
 704 bool
 705 sp_tweak_color_recursive (guint mode, SPItem *item, SPItem *item_at_point,
 706                           guint32 fill_goal, bool do_fill,
 707                           guint32 stroke_goal, bool do_stroke,
 708                           float opacity_goal, bool do_opacity,
 709                           NR::Point p, double radius, double force,
 710                           bool do_h, bool do_s, bool do_l, bool do_o)
 711 {
 712     bool did = false;
 713
 714     if (SP_IS_GROUP(item)) {
 715         for (SPObject *child = sp_object_first_child(SP_OBJECT(item)) ; child != NULL; child = SP_OBJECT_NEXT(child) ) {
 716             if (SP_IS_ITEM(child)) {
 717                 if (sp_tweak_color_recursive (mode, SP_ITEM(child), item_at_point,
 718                                           fill_goal, do_fill,
 719                                           stroke_goal, do_stroke,
 720                                           opacity_goal, do_opacity,
 721                                           p, radius, force, do_h, do_s, do_l, do_o));
 722                     did = true;
 723             }
 724         }
 725
 726     } else {
 727         SPStyle *style = SP_OBJECT_STYLE(item);
 728         if (!style) {
 729             return false;
 730         }
 731         NR::Maybe<NR::Rect> bbox = item->getBounds(sp_item_i2doc_affine(item),
 732                                                         SPItem::GEOMETRIC_BBOX);
 733         if (!bbox) {
 734             return false;
 735         }
 736
 737         NR::Rect brush(p - NR::Point(radius, radius), p + NR::Point(radius, radius));
 738
 739         NR::Point center = bbox->midpoint();
 740         double this_force;
 741
 742 // if item == item_at_point, use max force
 743         if (item == item_at_point) {
 744             this_force = force;
 745 // else if no overlap of bbox and brush box, skip:
 746         } else if (!bbox->intersects(brush)) {
 747             return false;
 748 //TODO:
 749 // else if object > 1.5 brush: test 4/8/16 points in the brush on hitting the object, choose max
 750         //} else if (bbox->maxExtent() > 3 * radius) {
 751         //}
 752 // else if object > 0.5 brush: test 4 corners of bbox and center on being in the brush, choose max
 753 // else if still smaller, then check only the object center:
 754         } else {
 755             this_force = force * tweak_profile (NR::L2 (p - center), radius);
 756         }
 757
 758         if (this_force > 0.002) {
 759
 760             if (do_fill) {
 761                 if (style->fill.isPaintserver()) {
 762                     tweak_colors_in_gradient (item, true, fill_goal, p, radius, this_force, mode, do_h, do_s, do_l, do_o);
 763                     did = true;
 764                 } else if (style->fill.isColor()) {
 765                     tweak_color (mode, style->fill.value.color.v.c, fill_goal, this_force, do_h, do_s, do_l);
 766                     item->updateRepr();
 767                     did = true;
 768                 }
 769             }
 770             if (do_stroke) {
 771                 if (style->stroke.isPaintserver()) {
 772                     tweak_colors_in_gradient (item, false, stroke_goal, p, radius, this_force, mode, do_h, do_s, do_l, do_o);
 773                     did = true;
 774                 } else if (style->stroke.isColor()) {
 775                     tweak_color (mode, style->stroke.value.color.v.c, stroke_goal, this_force, do_h, do_s, do_l);
 776                     item->updateRepr();
 777                     did = true;
 778                 }
 779             }
 780             if (do_opacity && do_o) {
 781                 tweak_opacity (mode, &style->opacity, opacity_goal, this_force);
 782             }
 783         }
 784     }
 785
 786     return did;
 787 }
 788
 789
 790 bool
 791 sp_tweak_dilate (SPTweakContext *tc, NR::Point event_p, NR::Point p, NR::Point vector)
 792 {
 793     Inkscape::Selection *selection = sp_desktop_selection(SP_EVENT_CONTEXT(tc)->desktop);
 794
 795     if (selection->isEmpty()) {
 796         return false;
 797     }
 798
 799     bool did = false;
 800     double radius = get_dilate_radius(tc);
 801     double force = get_dilate_force(tc);
 802     if (radius == 0 || force == 0) {
 803         return false;
 804     }
 805     double color_force = MIN(sqrt(force)/20.0, 1);
 806
 807     SPItem *item_at_point = SP_EVENT_CONTEXT(tc)->desktop->item_at_point(event_p, TRUE);
 808     Inkscape::XML::Node *tool_repr = inkscape_get_repr(INKSCAPE, "tools.tweak");
 809     SPCSSAttr *css = sp_repr_css_attr_inherited(tool_repr, "style");
 810     if (tc->mode == TWEAK_MODE_COLORPAINT && !css)
 811         return false;
 812
 813     bool do_fill = false, do_stroke = false, do_opacity = false;
 814     guint32 fill_goal = 0, stroke_goal = 0;
 815     float opacity_goal = 1;
 816
 817     const gchar *fill_prop = sp_repr_css_property(css, "fill", NULL);
 818     if (fill_prop && strcmp(fill_prop, "none")) {
 819         do_fill = true;
 820         fill_goal = sp_svg_read_color(fill_prop, 0);
 821     }
 822     const gchar *stroke_prop = sp_repr_css_property(css, "stroke", NULL);
 823     if (stroke_prop && strcmp(stroke_prop, "none")) {
 824         do_stroke = true;
 825         stroke_goal = sp_svg_read_color(stroke_prop, 0);
 826     }
 827     const gchar *opacity_prop = sp_repr_css_property(css, "opacity", NULL);
 828     if (opacity_prop) {
 829         do_opacity = true;
 830         sp_svg_number_read_f(opacity_prop, &opacity_goal);
 831     }
 832
 833     for (GSList *items = g_slist_copy((GSList *) selection->itemList());
 834          items != NULL;
 835          items = items->next) {
 836
 837         SPItem *item = (SPItem *) items->data;
 838
 839         if (SP_IS_BOX3D(item)) {
 840             // convert 3D boxes to ordinary groups before tweaking their shapes
 841             item = SP_ITEM(box3d_convert_to_group(SP_BOX3D(item)));
 842             selection->add(item);
 843         }
 844
 845         if (tc->mode == TWEAK_MODE_COLORPAINT || tc->mode == TWEAK_MODE_COLORJITTER) {
 846             if (do_fill || do_stroke || do_opacity) {
 847                 if (sp_tweak_color_recursive (tc->mode, item, item_at_point,
 848                                           fill_goal, do_fill,
 849                                           stroke_goal, do_stroke,
 850                                           opacity_goal, do_opacity,
 851                                           p, radius, color_force, tc->do_h, tc->do_s, tc->do_l, tc->do_o))
 852                 did = true;
 853             }
 854         } else {
 855             if (sp_tweak_dilate_recursive (selection, item, p, vector, tc->mode, radius, force, tc->fidelity))
 856                 did = true;
 857         }
 858     }
 859
 860     return did;
 861 }
 862
 863 void
 864 sp_tweak_update_area (SPTweakContext *tc)
 865 {
 866         double radius = get_dilate_radius(tc);
 867         NR::Matrix const sm (NR::scale(radius, radius) * NR::translate(SP_EVENT_CONTEXT(tc)->desktop->point()));
 868         sp_canvas_item_affine_absolute(tc->dilate_area, sm);
 869         sp_canvas_item_show(tc->dilate_area);
 870 }
 871
 872 void
 873 sp_tweak_switch_mode (SPTweakContext *tc, gint mode)
 874 {
 875     SP_EVENT_CONTEXT(tc)->desktop->setToolboxSelectOneValue ("tweak_tool_mode", mode);
 876     // need to set explicitly, because the prefs may not have changed by the previous
 877     tc->mode = mode;
 878     sp_tweak_update_cursor (tc, mode);
 879 }
 880
 881 void
 882 sp_tweak_switch_mode_temporarily (SPTweakContext *tc, gint mode)
 883 {
 884    // Juggling about so that prefs have the old value but tc->mode and the button show new mode:
 885    gint now_mode = prefs_get_int_attribute("tools.tweak", "mode", 0);
 886    SP_EVENT_CONTEXT(tc)->desktop->setToolboxSelectOneValue ("tweak_tool_mode", mode);
 887    // button has changed prefs, restore
 888    prefs_set_int_attribute("tools.tweak", "mode", now_mode);
 889    // changing prefs changed tc->mode, restore back :)
 890    tc->mode = mode;
 891    sp_tweak_update_cursor (tc, mode);
 892 }
 893
 894 gint
 895 sp_tweak_context_root_handler(SPEventContext *event_context,
 896                                   GdkEvent *event)
 897 {
 898     SPTweakContext *tc = SP_TWEAK_CONTEXT(event_context);
 899     SPDesktop *desktop = event_context->desktop;
 900
 901     gint ret = FALSE;
 902
 903     switch (event->type) {
 904         case GDK_ENTER_NOTIFY:
 905             sp_canvas_item_show(tc->dilate_area);
 906             break;
 907         case GDK_LEAVE_NOTIFY:
 908             sp_canvas_item_hide(tc->dilate_area);
 909             break;
 910         case GDK_BUTTON_PRESS:
 911             if (event->button.button == 1 && !event_context->space_panning) {
 912
 913                 if (Inkscape::have_viable_layer(desktop, tc->_message_context) == false) {
 914                     return TRUE;
 915                 }
 916
 917                 NR::Point const button_w(event->button.x,
 918                                          event->button.y);
 919                 NR::Point const button_dt(desktop->w2d(button_w));
 920                 tc->last_push = desktop->dt2doc(button_dt);
 921
 922                 sp_tweak_extinput(tc, event);
 923
 924                 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 3);
 925                 tc->is_drawing = true;
 926                 tc->is_dilating = true;
 927                 tc->has_dilated = false;
 928
 929                 ret = TRUE;
 930             }
 931             break;
 932         case GDK_MOTION_NOTIFY:
 933         {
 934             NR::Point const motion_w(event->motion.x,
 935                                      event->motion.y);
 936             NR::Point motion_dt(desktop->w2d(motion_w));
 937             NR::Point motion_doc(desktop->dt2doc(motion_dt));
 938             sp_tweak_extinput(tc, event);
 939
 940             // draw the dilating cursor
 941                 double radius = get_dilate_radius(tc);
 942                 NR::Matrix const sm (NR::scale(radius, radius) * NR::translate(desktop->w2d(motion_w)));
 943                 sp_canvas_item_affine_absolute(tc->dilate_area, sm);
 944                 sp_canvas_item_show(tc->dilate_area);
 945
 946                 guint num = 0;
 947                 if (!desktop->selection->isEmpty()) {
 948                     num = g_slist_length((GSList *) desktop->selection->itemList());
 949                 }
 950                 if (num == 0) {
 951                     tc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Nothing selected!</b> Select objects to tweak."));
 952                 } else {
 953                     switch (tc->mode) {
 954                         case TWEAK_MODE_PUSH:
 955                            tc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
 956                                                       ngettext("<b>Pushing %d</b> selected object",
 957                                                       "<b>Pushing %d</b> selected objects", num), num);
 958                            break;
 959                         case TWEAK_MODE_SHRINK:
 960                            tc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
 961                                                       ngettext("<b>Shrinking %d</b> selected object",
 962                                                       "<b>Shrinking %d</b> selected objects", num), num);
 963                            break;
 964                         case TWEAK_MODE_GROW:
 965                            tc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
 966                                                       ngettext("<b>Growing %d</b> selected object",
 967                                                       "<b>Growing %d</b> selected objects", num), num);
 968                            break;
 969                         case TWEAK_MODE_ATTRACT:
 970                            tc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
 971                                                       ngettext("<b>Attracting %d</b> selected object",
 972                                                       "<b>Attracting %d</b> selected objects", num), num);
 973                            break;
 974                         case TWEAK_MODE_REPEL:
 975                            tc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
 976                                                       ngettext("<b>Repelling %d</b> selected object",
 977                                                       "<b>Repelling %d</b> selected objects", num), num);
 978                            break;
 979                         case TWEAK_MODE_ROUGHEN:
 980                            tc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
 981                                                       ngettext("<b>Roughening %d</b> selected object",
 982                                                       "<b>Roughening %d</b> selected objects", num), num);
 983                         case TWEAK_MODE_COLORPAINT:
 984                            tc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
 985                                                       ngettext("<b>Painting %d</b> selected object",
 986                                                       "<b>Painting %d</b> selected objects", num), num);
 987                            break;
 988                         case TWEAK_MODE_COLORJITTER:
 989                            tc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
 990                                                       ngettext("<b>Jittering colors in %d</b> selected object",
 991                                                       "<b>Jittering colors in %d</b> selected objects", num), num);
 992                            break;
 993                     }
 994                 }
 995
 996
 997             // dilating:
 998             if (tc->is_drawing && ( event->motion.state & GDK_BUTTON1_MASK )) {
 999                 sp_tweak_dilate (tc, motion_w, motion_doc, motion_doc - tc->last_push);
1000                 //tc->last_push = motion_doc;
1001                 tc->has_dilated = true;
1002                 // it's slow, so prevent clogging up with events
1003                 gobble_motion_events(GDK_BUTTON1_MASK);
1004                 return TRUE;
1005             }
1006
1007         }
1008         break;
1009
1010
1011     case GDK_BUTTON_RELEASE:
1012     {
1013         NR::Point const motion_w(event->button.x, event->button.y);
1014         NR::Point const motion_dt(desktop->w2d(motion_w));
1015
1016         sp_canvas_end_forced_full_redraws(desktop->canvas);
1017         tc->is_drawing = false;
1018
1019         if (tc->is_dilating && event->button.button == 1 && !event_context->space_panning) {
1020             if (!tc->has_dilated) {
1021                 // if we did not rub, do a light tap
1022                 tc->pressure = 0.03;
1023                 sp_tweak_dilate (tc, motion_w, desktop->dt2doc(motion_dt), NR::Point(0,0));
1024             }
1025             tc->is_dilating = false;
1026             tc->has_dilated = false;
1027             switch (tc->mode) {
1028                 case TWEAK_MODE_PUSH:
1029                     sp_document_done(sp_desktop_document(SP_EVENT_CONTEXT(tc)->desktop),
1030                                      SP_VERB_CONTEXT_TWEAK, _("Push tweak"));
1031                     break;
1032                 case TWEAK_MODE_SHRINK:
1033                     sp_document_done(sp_desktop_document(SP_EVENT_CONTEXT(tc)->desktop),
1034                                      SP_VERB_CONTEXT_TWEAK, _("Shrink tweak"));
1035                     break;
1036                 case TWEAK_MODE_GROW:
1037                     sp_document_done(sp_desktop_document(SP_EVENT_CONTEXT(tc)->desktop),
1038                                      SP_VERB_CONTEXT_TWEAK, _("Grow tweak"));
1039                     break;
1040                 case TWEAK_MODE_ATTRACT:
1041                     sp_document_done(sp_desktop_document(SP_EVENT_CONTEXT(tc)->desktop),
1042                                      SP_VERB_CONTEXT_TWEAK, _("Attract tweak"));
1043                     break;
1044                 case TWEAK_MODE_REPEL:
1045                     sp_document_done(sp_desktop_document(SP_EVENT_CONTEXT(tc)->desktop),
1046                                      SP_VERB_CONTEXT_TWEAK, _("Repel tweak"));
1047                     break;
1048                 case TWEAK_MODE_ROUGHEN:
1049                     sp_document_done(sp_desktop_document(SP_EVENT_CONTEXT(tc)->desktop),
1050                                      SP_VERB_CONTEXT_TWEAK, _("Roughen tweak"));
1051                     break;
1052                 case TWEAK_MODE_COLORPAINT:
1053                     sp_document_done(sp_desktop_document(SP_EVENT_CONTEXT(tc)->desktop),
1054                                      SP_VERB_CONTEXT_TWEAK, _("Color paint tweak"));
1055                 case TWEAK_MODE_COLORJITTER:
1056                     sp_document_done(sp_desktop_document(SP_EVENT_CONTEXT(tc)->desktop),
1057                                      SP_VERB_CONTEXT_TWEAK, _("Color jitter tweak"));
1058                     break;
1059             }
1060         }
1061         break;
1062     }
1063
1064     case GDK_KEY_PRESS:
1065         switch (get_group0_keyval (&event->key)) {
1066         case GDK_p:
1067         case GDK_P:
1068         case GDK_1:
1069             if (MOD__SHIFT_ONLY) {
1070                 sp_tweak_switch_mode(tc, TWEAK_MODE_PUSH);
1071                 ret = TRUE;
1072             }
1073             break;
1074         case GDK_s:
1075         case GDK_S:
1076         case GDK_2:
1077             if (MOD__SHIFT_ONLY) {
1078                 sp_tweak_switch_mode(tc, TWEAK_MODE_SHRINK);
1079                 ret = TRUE;
1080             }
1081             break;
1082         case GDK_g:
1083         case GDK_G:
1084         case GDK_3:
1085             if (MOD__SHIFT_ONLY) {
1086                 sp_tweak_switch_mode(tc, TWEAK_MODE_GROW);
1087                 ret = TRUE;
1088             }
1089             break;
1090         case GDK_a:
1091         case GDK_A:
1092         case GDK_4:
1093             if (MOD__SHIFT_ONLY) {
1094                 sp_tweak_switch_mode(tc, TWEAK_MODE_ATTRACT);
1095                 ret = TRUE;
1096             }
1097             break;
1098         case GDK_e:
1099         case GDK_E:
1100         case GDK_5:
1101             if (MOD__SHIFT_ONLY) {
1102                 sp_tweak_switch_mode(tc, TWEAK_MODE_REPEL);
1103                 ret = TRUE;
1104             }
1105             break;
1106         case GDK_r:
1107         case GDK_R:
1108         case GDK_6:
1109             if (MOD__SHIFT_ONLY) {
1110                 sp_tweak_switch_mode(tc, TWEAK_MODE_ROUGHEN);
1111                 ret = TRUE;
1112             }
1113             break;
1114         case GDK_c:
1115         case GDK_C:
1116         case GDK_7:
1117             if (MOD__SHIFT_ONLY) {
1118                 sp_tweak_switch_mode(tc, TWEAK_MODE_COLORPAINT);
1119                 ret = TRUE;
1120             }
1121             break;
1122         case GDK_j:
1123         case GDK_J:
1124         case GDK_8:
1125             if (MOD__SHIFT_ONLY) {
1126                 sp_tweak_switch_mode(tc, TWEAK_MODE_COLORJITTER);
1127                 ret = TRUE;
1128             }
1129             break;
1130
1131         case GDK_Up:
1132         case GDK_KP_Up:
1133             if (!MOD__CTRL_ONLY) {
1134                 tc->force += 0.05;
1135                 if (tc->force > 1.0)
1136                     tc->force = 1.0;
1137                 desktop->setToolboxAdjustmentValue ("tweak-force", tc->force * 100);
1138                 ret = TRUE;
1139             }
1140             break;
1141         case GDK_Down:
1142         case GDK_KP_Down:
1143             if (!MOD__CTRL_ONLY) {
1144                 tc->force -= 0.05;
1145                 if (tc->force < 0.0)
1146                     tc->force = 0.0;
1147                 desktop->setToolboxAdjustmentValue ("tweak-force", tc->force * 100);
1148                 ret = TRUE;
1149             }
1150             break;
1151         case GDK_Right:
1152         case GDK_KP_Right:
1153             if (!MOD__CTRL_ONLY) {
1154                 tc->width += 0.01;
1155                 if (tc->width > 1.0)
1156                     tc->width = 1.0;
1157                 desktop->setToolboxAdjustmentValue ("altx-tweak", tc->width * 100); // the same spinbutton is for alt+x
1158                 sp_tweak_update_area(tc);
1159                 ret = TRUE;
1160             }
1161             break;
1162         case GDK_Left:
1163         case GDK_KP_Left:
1164             if (!MOD__CTRL_ONLY) {
1165                 tc->width -= 0.01;
1166                 if (tc->width < 0.01)
1167                     tc->width = 0.01;
1168                 desktop->setToolboxAdjustmentValue ("altx-tweak", tc->width * 100);
1169                 sp_tweak_update_area(tc);
1170                 ret = TRUE;
1171             }
1172             break;
1173         case GDK_Home:
1174         case GDK_KP_Home:
1175             tc->width = 0.01;
1176             desktop->setToolboxAdjustmentValue ("altx-tweak", tc->width * 100);
1177             sp_tweak_update_area(tc);
1178             ret = TRUE;
1179             break;
1180         case GDK_End:
1181         case GDK_KP_End:
1182             tc->width = 1.0;
1183             desktop->setToolboxAdjustmentValue ("altx-tweak", tc->width * 100);
1184             sp_tweak_update_area(tc);
1185             ret = TRUE;
1186             break;
1187         case GDK_x:
1188         case GDK_X:
1189             if (MOD__ALT_ONLY) {
1190                 desktop->setToolboxFocusTo ("altx-tweak");
1191                 ret = TRUE;
1192             }
1193             break;
1194
1195         case GDK_Control_L:
1196         case GDK_Control_R:
1197             if (MOD__SHIFT) {
1198                 sp_tweak_switch_mode_temporarily(tc, TWEAK_MODE_GROW);
1199             } else {
1200                 sp_tweak_switch_mode_temporarily(tc, TWEAK_MODE_SHRINK);
1201             }
1202             break;
1203         case GDK_Shift_L:
1204         case GDK_Shift_R:
1205             if (MOD__CTRL) {
1206                 sp_tweak_switch_mode_temporarily(tc, TWEAK_MODE_GROW);
1207             }
1208             break;
1209         default:
1210             break;
1211         }
1212         break;
1213
1214     case GDK_KEY_RELEASE:
1215         switch (get_group0_keyval(&event->key)) {
1216             case GDK_Control_L:
1217             case GDK_Control_R:
1218                 sp_tweak_switch_mode (tc, prefs_get_int_attribute("tools.tweak", "mode", 0));
1219                 tc->_message_context->clear();
1220                 break;
1221             case GDK_Shift_L:
1222             case GDK_Shift_R:
1223                 if (MOD__CTRL) {
1224                     sp_tweak_switch_mode_temporarily(tc, TWEAK_MODE_SHRINK);
1225                 }
1226                 break;
1227             break;
1228             default:
1229                 sp_tweak_switch_mode (tc, prefs_get_int_attribute("tools.tweak", "mode", 0));
1230                 break;
1231         }
1232
1233     default:
1234         break;
1235     }
1236
1237     if (!ret) {
1238         if (((SPEventContextClass *) parent_class)->root_handler) {
1239             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
1240         }
1241     }
1242
1243     return ret;
1244 }
1245
1246
1247 /*
1248   Local Variables:
1249   mode:c++
1250   c-file-style:"stroustrup"
1251   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1252   indent-tabs-mode:nil
1253   fill-column:99
1254   End:
1255 */
1256 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :