1 #define CANVAS_AXONOMGRID_C
3 /*
4 * Copyright (C) 2006-2008 Johan Engelen <johan@shouraizou.nl>
5 */
7 /*
8 * Current limits are: one axis (y-axis) is always vertical. The other two
9 * axes are bound to a certain range of angles. The z-axis always has an angle
10 * smaller than 90 degrees (measured from horizontal, 0 degrees being a line extending
11 * to the right). The x-axis will always have an angle between 0 and 90 degrees.
12 */
14 /*
15 * TODO:
16 * THIS FILE AND THE HEADER FILE NEED CLEANING UP. PLEASE DO NOT HESISTATE TO DO SO.
17 * For example: the line drawing code should not be here. There _must_ be a function somewhere else that can provide this functionality...
18 */
20 #include "sp-canvas-util.h"
21 #include "canvas-axonomgrid.h"
22 #include "util/mathfns.h"
23 #include "2geom/geom.h"
24 #include "display-forward.h"
25 #include <libnr/nr-pixops.h>
27 #include "canvas-grid.h"
28 #include "desktop-handles.h"
29 #include "helper/units.h"
30 #include "svg/svg-color.h"
31 #include "xml/node-event-vector.h"
32 #include "sp-object.h"
34 #include "sp-namedview.h"
35 #include "inkscape.h"
36 #include "desktop.h"
38 #include "document.h"
39 #include "prefs-utils.h"
41 #define SAFE_SETPIXEL //undefine this when it is certain that setpixel is never called with invalid params
43 enum Dim3 { X=0, Y, Z };
45 #ifndef M_PI
46 # define M_PI 3.14159265358979323846
47 #endif
49 static double deg_to_rad(double deg) { return deg*M_PI/180.0;}
52 /**
53 \brief This function renders a pixel on a particular buffer.
55 The topleft of the buffer equals
56 ( rect.x0 , rect.y0 ) in screen coordinates
57 ( 0 , 0 ) in setpixel coordinates
58 The bottomright of the buffer equals
59 ( rect.x1 , rect,y1 ) in screen coordinates
60 ( rect.x1 - rect.x0 , rect.y1 - rect.y0 ) in setpixel coordinates
61 */
62 static void
63 sp_caxonomgrid_setpixel (SPCanvasBuf *buf, gint x, gint y, guint32 rgba)
64 {
65 #ifdef SAFE_SETPIXEL
66 if ( (x >= buf->rect.x0) && (x < buf->rect.x1) && (y >= buf->rect.y0) && (y < buf->rect.y1) ) {
67 #endif
68 guint r, g, b, a;
69 r = NR_RGBA32_R (rgba);
70 g = NR_RGBA32_G (rgba);
71 b = NR_RGBA32_B (rgba);
72 a = NR_RGBA32_A (rgba);
73 guchar * p = buf->buf + (y - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;
74 p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
75 p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
76 p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
77 #ifdef SAFE_SETPIXEL
78 }
79 #endif
80 }
82 /**
83 \brief This function renders a line on a particular canvas buffer,
84 using Bresenham's line drawing function.
85 http://www.cs.unc.edu/~mcmillan/comp136/Lecture6/Lines.html
86 Coordinates are interpreted as SCREENcoordinates
87 */
88 static void
89 sp_caxonomgrid_drawline (SPCanvasBuf *buf, gint x0, gint y0, gint x1, gint y1, guint32 rgba)
90 {
91 int dy = y1 - y0;
92 int dx = x1 - x0;
93 int stepx, stepy;
95 if (dy < 0) { dy = -dy; stepy = -1; } else { stepy = 1; }
96 if (dx < 0) { dx = -dx; stepx = -1; } else { stepx = 1; }
97 dy <<= 1; // dy is now 2*dy
98 dx <<= 1; // dx is now 2*dx
100 sp_caxonomgrid_setpixel(buf, x0, y0, rgba);
101 if (dx > dy) {
102 int fraction = dy - (dx >> 1); // same as 2*dy - dx
103 while (x0 != x1) {
104 if (fraction >= 0) {
105 y0 += stepy;
106 fraction -= dx; // same as fraction -= 2*dx
107 }
108 x0 += stepx;
109 fraction += dy; // same as fraction -= 2*dy
110 sp_caxonomgrid_setpixel(buf, x0, y0, rgba);
111 }
112 } else {
113 int fraction = dx - (dy >> 1);
114 while (y0 != y1) {
115 if (fraction >= 0) {
116 x0 += stepx;
117 fraction -= dy;
118 }
119 y0 += stepy;
120 fraction += dx;
121 sp_caxonomgrid_setpixel(buf, x0, y0, rgba);
122 }
123 }
125 }
127 static void
128 sp_grid_vline (SPCanvasBuf *buf, gint x, gint ys, gint ye, guint32 rgba)
129 {
130 if ((x >= buf->rect.x0) && (x < buf->rect.x1)) {
131 guint r, g, b, a;
132 gint y0, y1, y;
133 guchar *p;
134 r = NR_RGBA32_R(rgba);
135 g = NR_RGBA32_G (rgba);
136 b = NR_RGBA32_B (rgba);
137 a = NR_RGBA32_A (rgba);
138 y0 = MAX (buf->rect.y0, ys);
139 y1 = MIN (buf->rect.y1, ye + 1);
140 p = buf->buf + (y0 - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;
141 for (y = y0; y < y1; y++) {
142 p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
143 p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
144 p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
145 p += buf->buf_rowstride;
146 }
147 }
148 }
150 namespace Inkscape {
153 /**
154 * A DIRECT COPY-PASTE FROM DOCUMENT-PROPERTIES.CPP TO QUICKLY GET RESULTS
155 *
156 * Helper function that attachs widgets in a 3xn table. The widgets come in an
157 * array that has two entries per table row. The two entries code for four
158 * possible cases: (0,0) means insert space in first column; (0, non-0) means
159 * widget in columns 2-3; (non-0, 0) means label in columns 1-3; and
160 * (non-0, non-0) means two widgets in columns 2 and 3.
161 **/
162 #define SPACE_SIZE_X 15
163 #define SPACE_SIZE_Y 10
164 static inline void
165 attach_all(Gtk::Table &table, Gtk::Widget const *const arr[], unsigned size, int start = 0)
166 {
167 for (unsigned i=0, r=start; i<size/sizeof(Gtk::Widget*); i+=2) {
168 if (arr[i] && arr[i+1]) {
169 table.attach (const_cast<Gtk::Widget&>(*arr[i]), 1, 2, r, r+1,
170 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
171 table.attach (const_cast<Gtk::Widget&>(*arr[i+1]), 2, 3, r, r+1,
172 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
173 } else {
174 if (arr[i+1]) {
175 table.attach (const_cast<Gtk::Widget&>(*arr[i+1]), 1, 3, r, r+1,
176 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
177 } else if (arr[i]) {
178 Gtk::Label& label = reinterpret_cast<Gtk::Label&> (const_cast<Gtk::Widget&>(*arr[i]));
179 label.set_alignment (0.0);
180 table.attach (label, 0, 3, r, r+1,
181 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
182 } else {
183 Gtk::HBox *space = manage (new Gtk::HBox);
184 space->set_size_request (SPACE_SIZE_X, SPACE_SIZE_Y);
185 table.attach (*space, 0, 1, r, r+1,
186 (Gtk::AttachOptions)0, (Gtk::AttachOptions)0,0,0);
187 }
188 }
189 ++r;
190 }
191 }
193 CanvasAxonomGrid::CanvasAxonomGrid (SPNamedView * nv, Inkscape::XML::Node * in_repr, SPDocument * in_doc)
194 : CanvasGrid(nv, in_repr, in_doc, GRID_AXONOMETRIC)
195 {
196 gridunit = sp_unit_get_by_abbreviation( prefs_get_string_attribute("options.grids.axonom", "units") );
197 if (!gridunit)
198 gridunit = &sp_unit_get_by_id(SP_UNIT_PX);
199 origin[NR::X] = sp_units_get_pixels( prefs_get_double_attribute ("options.grids.axonom", "origin_x", 0.0), *(gridunit) );
200 origin[NR::Y] = sp_units_get_pixels( prefs_get_double_attribute ("options.grids.axonom", "origin_y", 0.0), *(gridunit) );
201 color = prefs_get_int_attribute("options.grids.axonom", "color", 0x0000ff20);
202 empcolor = prefs_get_int_attribute("options.grids.axonom", "empcolor", 0x0000ff40);
203 empspacing = prefs_get_int_attribute("options.grids.axonom", "empspacing", 5);
204 lengthy = sp_units_get_pixels( prefs_get_double_attribute ("options.grids.axonom", "spacing_y", 1.0), *(gridunit) );
205 angle_deg[X] = prefs_get_double_attribute ("options.grids.axonom", "angle_x", 30.0);
206 angle_deg[Z] = prefs_get_double_attribute ("options.grids.axonom", "angle_z", 30.0);
207 angle_deg[Y] = 0;
209 angle_rad[X] = deg_to_rad(angle_deg[X]);
210 tan_angle[X] = tan(angle_rad[X]);
211 angle_rad[Z] = deg_to_rad(angle_deg[Z]);
212 tan_angle[Z] = tan(angle_rad[Z]);
214 snapper = new CanvasAxonomGridSnapper(this, namedview, 0);
215 }
217 CanvasAxonomGrid::~CanvasAxonomGrid ()
218 {
219 if (snapper) delete snapper;
220 }
223 /* fixme: Collect all these length parsing methods and think common sane API */
225 static gboolean sp_nv_read_length(gchar const *str, guint base, gdouble *val, SPUnit const **unit)
226 {
227 if (!str) {
228 return FALSE;
229 }
231 gchar *u;
232 gdouble v = g_ascii_strtod(str, &u);
233 if (!u) {
234 return FALSE;
235 }
236 while (isspace(*u)) {
237 u += 1;
238 }
240 if (!*u) {
241 /* No unit specified - keep default */
242 *val = v;
243 return TRUE;
244 }
246 if (base & SP_UNIT_DEVICE) {
247 if (u[0] && u[1] && !isalnum(u[2]) && !strncmp(u, "px", 2)) {
248 *unit = &sp_unit_get_by_id(SP_UNIT_PX);
249 *val = v;
250 return TRUE;
251 }
252 }
254 if (base & SP_UNIT_ABSOLUTE) {
255 if (!strncmp(u, "pt", 2)) {
256 *unit = &sp_unit_get_by_id(SP_UNIT_PT);
257 } else if (!strncmp(u, "mm", 2)) {
258 *unit = &sp_unit_get_by_id(SP_UNIT_MM);
259 } else if (!strncmp(u, "cm", 2)) {
260 *unit = &sp_unit_get_by_id(SP_UNIT_CM);
261 } else if (!strncmp(u, "m", 1)) {
262 *unit = &sp_unit_get_by_id(SP_UNIT_M);
263 } else if (!strncmp(u, "in", 2)) {
264 *unit = &sp_unit_get_by_id(SP_UNIT_IN);
265 } else {
266 return FALSE;
267 }
268 *val = v;
269 return TRUE;
270 }
272 return FALSE;
273 }
275 static gboolean sp_nv_read_opacity(gchar const *str, guint32 *color)
276 {
277 if (!str) {
278 return FALSE;
279 }
281 gchar *u;
282 gdouble v = g_ascii_strtod(str, &u);
283 if (!u) {
284 return FALSE;
285 }
286 v = CLAMP(v, 0.0, 1.0);
288 *color = (*color & 0xffffff00) | (guint32) floor(v * 255.9999);
290 return TRUE;
291 }
295 void
296 CanvasAxonomGrid::readRepr()
297 {
298 gchar const *value;
299 if ( (value = repr->attribute("originx")) ) {
300 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &origin[NR::X], &gridunit);
301 origin[NR::X] = sp_units_get_pixels(origin[NR::X], *(gridunit));
302 }
303 if ( (value = repr->attribute("originy")) ) {
304 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &origin[NR::Y], &gridunit);
305 origin[NR::Y] = sp_units_get_pixels(origin[NR::Y], *(gridunit));
306 }
308 if ( (value = repr->attribute("spacingy")) ) {
309 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &lengthy, &gridunit);
310 lengthy = sp_units_get_pixels(lengthy, *(gridunit));
311 if (lengthy < 1.0) lengthy = 1.0;
312 }
314 if ( (value = repr->attribute("gridanglex")) ) {
315 angle_deg[X] = g_ascii_strtod(value, NULL);
316 if (angle_deg[X] < 1.0) angle_deg[X] = 1.0;
317 if (angle_deg[X] > 89.0) angle_deg[X] = 89.0;
318 angle_rad[X] = deg_to_rad(angle_deg[X]);
319 tan_angle[X] = tan(angle_rad[X]);
320 }
322 if ( (value = repr->attribute("gridanglez")) ) {
323 angle_deg[Z] = g_ascii_strtod(value, NULL);
324 if (angle_deg[Z] < 1.0) angle_deg[Z] = 1.0;
325 if (angle_deg[Z] > 89.0) angle_deg[Z] = 89.0;
326 angle_rad[Z] = deg_to_rad(angle_deg[Z]);
327 tan_angle[Z] = tan(angle_rad[Z]);
328 }
330 if ( (value = repr->attribute("color")) ) {
331 color = (color & 0xff) | sp_svg_read_color(value, color);
332 }
334 if ( (value = repr->attribute("empcolor")) ) {
335 empcolor = (empcolor & 0xff) | sp_svg_read_color(value, empcolor);
336 }
338 if ( (value = repr->attribute("opacity")) ) {
339 sp_nv_read_opacity(value, &color);
340 }
341 if ( (value = repr->attribute("empopacity")) ) {
342 sp_nv_read_opacity(value, &empcolor);
343 }
345 if ( (value = repr->attribute("empspacing")) ) {
346 empspacing = atoi(value);
347 }
349 if ( (value = repr->attribute("visible")) ) {
350 visible = (strcmp(value,"true") == 0);
351 }
353 if ( (value = repr->attribute("enabled")) ) {
354 g_assert(snapper != NULL);
355 snapper->setEnabled(strcmp(value,"true") == 0);
356 }
358 for (GSList *l = canvasitems; l != NULL; l = l->next) {
359 sp_canvas_item_request_update ( SP_CANVAS_ITEM(l->data) );
360 }
361 return;
362 }
364 /**
365 * Called when XML node attribute changed; updates dialog widgets if change was not done by widgets themselves.
366 */
367 void
368 CanvasAxonomGrid::onReprAttrChanged(Inkscape::XML::Node */*repr*/, gchar const */*key*/, gchar const */*oldval*/, gchar const */*newval*/, bool /*is_interactive*/)
369 {
370 readRepr();
372 if ( ! (_wr.isUpdating()) )
373 updateWidgets();
374 }
379 Gtk::Widget *
380 CanvasAxonomGrid::newSpecificWidget()
381 {
382 Gtk::Table * table = Gtk::manage( new Gtk::Table(1,1) );
383 table->set_spacings(2);
385 _wr.setUpdating (true);
387 Inkscape::UI::Widget::RegisteredUnitMenu *_rumg = new Inkscape::UI::Widget::RegisteredUnitMenu();
388 Inkscape::UI::Widget::RegisteredScalarUnit *_rsu_ox = new Inkscape::UI::Widget::RegisteredScalarUnit();
389 Inkscape::UI::Widget::RegisteredScalarUnit *_rsu_oy = new Inkscape::UI::Widget::RegisteredScalarUnit();
390 Inkscape::UI::Widget::RegisteredScalarUnit *_rsu_sy = new Inkscape::UI::Widget::RegisteredScalarUnit();
391 Inkscape::UI::Widget::RegisteredScalar *_rsu_ax = Gtk::manage( new Inkscape::UI::Widget::RegisteredScalar(
392 _("Angle X:"), _("Angle of x-axis"), "gridanglex", _wr, repr, doc ) );
393 Inkscape::UI::Widget::RegisteredScalar *_rsu_az = Gtk::manage( new Inkscape::UI::Widget::RegisteredScalar(
394 _("Angle Z:"), _("Angle of z-axis"), "gridanglez", _wr, repr, doc ) );
396 Inkscape::UI::Widget::RegisteredColorPicker *_rcp_gcol = Gtk::manage(
397 new Inkscape::UI::Widget::RegisteredColorPicker(
398 _("Grid line _color:"), _("Grid line color"), _("Color of grid lines"),
399 "color", "opacity", _wr, repr, doc));
401 Inkscape::UI::Widget::RegisteredColorPicker *_rcp_gmcol = Gtk::manage(
402 new Inkscape::UI::Widget::RegisteredColorPicker(
403 _("Ma_jor grid line color:"), _("Major grid line color"),
404 _("Color of the major (highlighted) grid lines"),
405 "empcolor", "empopacity", _wr, repr, doc));
407 Inkscape::UI::Widget::RegisteredSuffixedInteger *_rsi = new Inkscape::UI::Widget::RegisteredSuffixedInteger();
409 Inkscape::UI::Widget::ScalarUnit * sutemp = NULL;
410 _rumg->init (_("Grid _units:"), "units", _wr, repr, doc);
411 _rsu_ox->init (_("_Origin X:"), _("X coordinate of grid origin"),
412 "originx", *_rumg, _wr, repr, doc);
413 sutemp = _rsu_ox->getSU();
414 sutemp->setDigits(4);
415 sutemp->setIncrements(0.1, 1.0);
416 _rsu_oy->init (_("O_rigin Y:"), _("Y coordinate of grid origin"),
417 "originy", *_rumg, _wr, repr, doc);
418 sutemp = _rsu_oy->getSU();
419 sutemp->setDigits(4);
420 sutemp->setIncrements(0.1, 1.0);
421 _rsu_sy->init (_("Spacing _Y:"), _("Base length of z-axis"),
422 "spacingy", *_rumg, _wr, repr, doc);
423 sutemp = _rsu_sy->getSU();
424 sutemp->setDigits(4);
425 sutemp->setIncrements(0.1, 1.0);
426 _rsi->init (_("_Major grid line every:"), _("lines"), "empspacing", _wr, repr, doc);
427 _wr.setUpdating (false);
429 Gtk::Widget const *const widget_array[] = {
430 _rumg->_label, _rumg->_sel,
431 0, _rsu_ox->getSU(),
432 0, _rsu_oy->getSU(),
433 0, _rsu_sy->getSU(),
434 0, _rsu_ax,
435 0, _rsu_az,
436 _rcp_gcol->_label, _rcp_gcol,
437 0, 0,
438 _rcp_gmcol->_label, _rcp_gmcol,
439 _rsi->_label, &_rsi->_hbox,
440 };
442 attach_all (*table, widget_array, sizeof(widget_array));
444 if (repr) readRepr();
446 // set widget values
447 _rumg->setUnit (gridunit);
449 gdouble val;
450 val = origin[NR::X];
451 val = sp_pixels_get_units (val, *(gridunit));
452 _rsu_ox->setValue (val);
453 val = origin[NR::Y];
454 val = sp_pixels_get_units (val, *(gridunit));
455 _rsu_oy->setValue (val);
456 val = lengthy;
457 double gridy = sp_pixels_get_units (val, *(gridunit));
458 _rsu_sy->setValue (gridy);
460 _rsu_ax->setValue(angle_deg[X]);
461 _rsu_az->setValue(angle_deg[Z]);
463 _rcp_gcol->setRgba32 (color);
464 _rcp_gmcol->setRgba32 (empcolor);
465 _rsi->setValue (empspacing);
467 return table;
468 }
471 /**
472 * Update dialog widgets from object's values.
473 */
474 void
475 CanvasAxonomGrid::updateWidgets()
476 {
477 /* if (_wr.isUpdating()) return;
479 _wr.setUpdating (true);
481 _rcb_visible.setActive(visible);
482 if (snapper != NULL) {
483 _rcb_enabled.setActive(snapper->getEnabled());
484 }
486 _rumg.setUnit (gridunit);
488 gdouble val;
489 val = origin[NR::X];
490 val = sp_pixels_get_units (val, *(gridunit));
491 _rsu_ox.setValue (val);
492 val = origin[NR::Y];
493 val = sp_pixels_get_units (val, *(gridunit));
494 _rsu_oy.setValue (val);
495 val = lengthy;
496 double gridy = sp_pixels_get_units (val, *(gridunit));
497 _rsu_sy.setValue (gridy);
499 _rsu_ax.setValue(angle_deg[X]);
500 _rsu_az.setValue(angle_deg[Z]);
502 _rcp_gcol.setRgba32 (color);
503 _rcp_gmcol.setRgba32 (empcolor);
504 _rsi.setValue (empspacing);
506 _wr.setUpdating (false);
508 return;
509 */
510 }
514 void
515 CanvasAxonomGrid::Update (NR::Matrix const &affine, unsigned int /*flags*/)
516 {
517 ow = origin * affine;
518 sw = NR::Point(fabs(affine[0]),fabs(affine[3]));
520 for(int dim = 0; dim < 2; dim++) {
521 gint scaling_factor = empspacing;
523 if (scaling_factor <= 1)
524 scaling_factor = 5;
526 scaled = FALSE;
527 int watchdog = 0;
528 while ( (sw[dim] < 8.0) & (watchdog < 100) ) {
529 scaled = TRUE;
530 sw[dim] *= scaling_factor;
531 // First pass, go up to the major line spacing, then
532 // keep increasing by two.
533 scaling_factor = 2;
534 watchdog++;
535 }
537 }
539 spacing_ylines = sw[NR::X] * lengthy /(tan_angle[X] + tan_angle[Z]);
540 lyw = sw[NR::Y] * lengthy;
541 lxw_x = (lengthy / tan_angle[X]) * sw[NR::X];
542 lxw_z = (lengthy / tan_angle[Z]) * sw[NR::X];
544 if (empspacing == 0) {
545 scaled = TRUE;
546 }
548 }
550 void
551 CanvasAxonomGrid::Render (SPCanvasBuf *buf)
552 {
553 //set correct coloring, depending preference (when zoomed out, always major coloring or minor coloring)
554 guint32 _empcolor;
555 bool preference = prefs_get_int_attribute ("options.grids", "no_emphasize_when_zoomedout", 0) == 1;
556 if( scaled && preference ) {
557 _empcolor = color;
558 } else {
559 _empcolor = empcolor;
560 }
562 // gc = gridcoordinates (the coordinates calculated from the grids origin 'grid->ow'.
563 // sc = screencoordinates ( for example "buf->rect.x0" is in screencoordinates )
564 // bc = buffer patch coordinates
566 // tl = topleft ; br = bottomright
567 NR::Point buf_tl_gc;
568 NR::Point buf_br_gc;
569 buf_tl_gc[NR::X] = buf->rect.x0 - ow[NR::X];
570 buf_tl_gc[NR::Y] = buf->rect.y0 - ow[NR::Y];
571 buf_br_gc[NR::X] = buf->rect.x1 - ow[NR::X];
572 buf_br_gc[NR::Y] = buf->rect.y1 - ow[NR::Y];
574 gdouble x;
575 gdouble y;
577 // render the three separate line groups representing the main-axes
579 // x-axis always goes from topleft to bottomright. (0,0) - (1,1)
580 gdouble const xintercept_y_bc = (buf_tl_gc[NR::X] * tan_angle[X]) - buf_tl_gc[NR::Y] ;
581 gdouble const xstart_y_sc = ( xintercept_y_bc - floor(xintercept_y_bc/lyw)*lyw ) + buf->rect.y0;
582 gint const xlinestart = (gint) Inkscape::round( (xstart_y_sc - buf->rect.x0*tan_angle[X] -ow[NR::Y]) / lyw );
583 gint xlinenum = xlinestart;
584 // lines starting on left side.
585 for (y = xstart_y_sc; y < buf->rect.y1; y += lyw, xlinenum++) {
586 gint const x0 = buf->rect.x0;
587 gint const y0 = (gint) Inkscape::round(y);
588 gint const x1 = x0 + (gint) Inkscape::round( (buf->rect.y1 - y) / tan_angle[X] );
589 gint const y1 = buf->rect.y1;
591 if (!scaled && (xlinenum % empspacing) != 0) {
592 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, color);
593 } else {
594 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, _empcolor);
595 }
596 }
597 // lines starting from top side
598 gdouble const xstart_x_sc = buf->rect.x0 + (lxw_x - (xstart_y_sc - buf->rect.y0) / tan_angle[X]) ;
599 xlinenum = xlinestart-1;
600 for (x = xstart_x_sc; x < buf->rect.x1; x += lxw_x, xlinenum--) {
601 gint const y0 = buf->rect.y0;
602 gint const y1 = buf->rect.y1;
603 gint const x0 = (gint) Inkscape::round(x);
604 gint const x1 = x0 + (gint) Inkscape::round( (y1 - y0) / tan_angle[X] );
606 if (!scaled && (xlinenum % empspacing) != 0) {
607 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, color);
608 } else {
609 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, _empcolor);
610 }
611 }
613 // y-axis lines (vertical)
614 gdouble const ystart_x_sc = floor (buf_tl_gc[NR::X] / spacing_ylines) * spacing_ylines + ow[NR::X];
615 gint const ylinestart = (gint) Inkscape::round((ystart_x_sc - ow[NR::X]) / spacing_ylines);
616 gint ylinenum = ylinestart;
617 for (x = ystart_x_sc; x < buf->rect.x1; x += spacing_ylines, ylinenum++) {
618 gint const x0 = (gint) Inkscape::round(x);
620 if (!scaled && (ylinenum % empspacing) != 0) {
621 sp_grid_vline (buf, x0, buf->rect.y0, buf->rect.y1 - 1, color);
622 } else {
623 sp_grid_vline (buf, x0, buf->rect.y0, buf->rect.y1 - 1, _empcolor);
624 }
625 }
627 // z-axis always goes from bottomleft to topright. (0,1) - (1,0)
628 gdouble const zintercept_y_bc = (buf_tl_gc[NR::X] * -tan_angle[Z]) - buf_tl_gc[NR::Y] ;
629 gdouble const zstart_y_sc = ( zintercept_y_bc - floor(zintercept_y_bc/lyw)*lyw ) + buf->rect.y0;
630 gint const zlinestart = (gint) Inkscape::round( (zstart_y_sc + buf->rect.x0*tan_angle[Z] - ow[NR::Y]) / lyw );
631 gint zlinenum = zlinestart;
632 // lines starting from left side
633 for (y = zstart_y_sc; y < buf->rect.y1; y += lyw, zlinenum++) {
634 gint const x0 = buf->rect.x0;
635 gint const y0 = (gint) Inkscape::round(y);
636 gint const x1 = x0 + (gint) Inkscape::round( (y - buf->rect.y0 ) / tan_angle[Z] );
637 gint const y1 = buf->rect.y0;
639 if (!scaled && (zlinenum % empspacing) != 0) {
640 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, color);
641 } else {
642 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, _empcolor);
643 }
644 }
645 // draw lines from bottom-up
646 gdouble const zstart_x_sc = buf->rect.x0 + (y - buf->rect.y1) / tan_angle[Z] ;
647 for (x = zstart_x_sc; x < buf->rect.x1; x += lxw_z, zlinenum++) {
648 gint const y0 = buf->rect.y1;
649 gint const y1 = buf->rect.y0;
650 gint const x0 = (gint) Inkscape::round(x);
651 gint const x1 = x0 + (gint) Inkscape::round( (buf->rect.y1 - buf->rect.y0) / tan_angle[Z] );
653 if (!scaled && (zlinenum % empspacing) != 0) {
654 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, color);
655 } else {
656 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, _empcolor);
657 }
658 }
659 }
661 CanvasAxonomGridSnapper::CanvasAxonomGridSnapper(CanvasAxonomGrid *grid, SPNamedView const *nv, NR::Coord const d) : LineSnapper(nv, d)
662 {
663 this->grid = grid;
664 }
666 LineSnapper::LineList
667 CanvasAxonomGridSnapper::_getSnapLines(NR::Point const &p) const
668 {
669 LineList s;
671 if ( grid == NULL ) {
672 return s;
673 }
675 /* This is to make sure we snap to only visible grid lines */
676 double scaled_spacing_h = grid->spacing_ylines; // this is spacing of visible lines if screen pixels
677 double scaled_spacing_v = grid->lyw; // vertical
679 // convert screen pixels to px
680 // FIXME: after we switch to snapping dist in screen pixels, this will be unnecessary
681 if (SP_ACTIVE_DESKTOP) {
682 scaled_spacing_h /= SP_ACTIVE_DESKTOP->current_zoom();
683 scaled_spacing_v /= SP_ACTIVE_DESKTOP->current_zoom();
684 }
686 // In an axonometric grid, any point will be surrounded by 6 grid lines:
687 // - 2 vertical grid lines, one left and one right from the point
688 // - 2 angled z grid lines, one above and one below the point
689 // - 2 angled x grid lines, one above and one below the point
691 // Calculate the x coordinate of the vertical grid lines
692 NR::Coord x_max = Inkscape::Util::round_to_upper_multiple_plus(p[NR::X], scaled_spacing_h, grid->origin[NR::X]);
693 NR::Coord x_min = Inkscape::Util::round_to_lower_multiple_plus(p[NR::X], scaled_spacing_h, grid->origin[NR::X]);
695 // Calculate the y coordinate of the intersection of the angled grid lines with the y-axis
696 double y_proj_along_z = p[NR::Y] - grid->tan_angle[Z]*(p[NR::X] - grid->origin[NR::X]);
697 double y_proj_along_x = p[NR::Y] + grid->tan_angle[X]*(p[NR::X] - grid->origin[NR::X]);
698 double y_proj_along_z_max = Inkscape::Util::round_to_upper_multiple_plus(y_proj_along_z, scaled_spacing_v, grid->origin[NR::Y]);
699 double y_proj_along_z_min = Inkscape::Util::round_to_lower_multiple_plus(y_proj_along_z, scaled_spacing_v, grid->origin[NR::Y]);
700 double y_proj_along_x_max = Inkscape::Util::round_to_upper_multiple_plus(y_proj_along_x, scaled_spacing_v, grid->origin[NR::Y]);
701 double y_proj_along_x_min = Inkscape::Util::round_to_lower_multiple_plus(y_proj_along_x, scaled_spacing_v, grid->origin[NR::Y]);
703 // Calculate the normal for the angled grid lines
704 NR::Point norm_x = NR::rot90(NR::Point(1, -grid->tan_angle[X]));
705 NR::Point norm_z = NR::rot90(NR::Point(1, grid->tan_angle[Z]));
707 // The four angled grid lines form a parallellogram, enclosing the point
708 // One of the two vertical grid lines divides this parallellogram in two triangles
709 // We will now try to find out in which half (i.e. triangle) our point is, and return
710 // only the three grid lines defining that triangle
712 // The vertical grid line is at the intersection of two angled grid lines.
713 // Now go find that intersection!
714 Geom::Point result;
715 Geom::IntersectorKind is = line_intersection(norm_x.to_2geom(), norm_x[NR::Y]*y_proj_along_x_max,
716 norm_z.to_2geom(), norm_z[NR::Y]*y_proj_along_z_max,
717 result);
719 // Determine which half of the parallellogram to use
720 bool use_left_half = true;
721 bool use_right_half = true;
723 if (is == Geom::intersects) {
724 use_left_half = (p[NR::X] - grid->origin[NR::X]) < result[Geom::X];
725 use_right_half = !use_left_half;
726 }
728 //std::cout << "intersection at " << result << " leads to use_left_half = " << use_left_half << " and use_right_half = " << use_right_half << std::endl;
730 // Return the three grid lines which define the triangle that encloses our point
731 // If we didn't find an intersection above, all 6 grid lines will be returned
732 if (use_left_half) {
733 s.push_back(std::make_pair(norm_z, NR::Point(grid->origin[NR::X], y_proj_along_z_max)));
734 s.push_back(std::make_pair(norm_x, NR::Point(grid->origin[NR::X], y_proj_along_x_min)));
735 s.push_back(std::make_pair(component_vectors[NR::X], NR::Point(x_max, 0)));
736 }
738 if (use_right_half) {
739 s.push_back(std::make_pair(norm_z, NR::Point(grid->origin[NR::X], y_proj_along_z_min)));
740 s.push_back(std::make_pair(norm_x, NR::Point(grid->origin[NR::X], y_proj_along_x_max)));
741 s.push_back(std::make_pair(component_vectors[NR::X], NR::Point(x_min, 0)));
742 }
744 return s;
745 }
747 void CanvasAxonomGridSnapper::_addSnappedLine(SnappedConstraints &sc, NR::Point const snapped_point, NR::Coord const snapped_distance, NR::Point const normal_to_line, NR::Point const point_on_line) const
748 {
749 SnappedLine dummy = SnappedLine(snapped_point, snapped_distance, getSnapperTolerance(), getSnapperAlwaysSnap(), normal_to_line, point_on_line);
750 sc.grid_lines.push_back(dummy);
751 }
755 }; // namespace Inkscape
758 /*
759 Local Variables:
760 mode:c++
761 c-file-style:"stroustrup"
762 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
763 indent-tabs-mode:nil
764 fill-column:99
765 End:
766 */
767 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :