1 #define INKSCAPE_CANVAS_GRID_C
3 /*
4 *
5 * Copyright (C) Johan Engelen 2006-2007 <johan@shouraizou.nl>
6 * Copyright (C) Lauris Kaplinski 2000
7 *
8 */
11 #include "sp-canvas-util.h"
12 #include "display-forward.h"
13 #include <libnr/nr-pixops.h>
14 #include "desktop-handles.h"
15 #include "helper/units.h"
16 #include "svg/svg-color.h"
17 #include "xml/node-event-vector.h"
18 #include "sp-object.h"
20 #include "sp-namedview.h"
21 #include "inkscape.h"
22 #include "desktop.h"
24 #include "../document.h"
26 #include "canvas-grid.h"
27 #include "canvas-axonomgrid.h"
29 namespace Inkscape {
31 #define DEFAULTGRIDCOLOR 0x0000FF20
32 #define DEFAULTGRIDEMPCOLOR 0x0000FF40
34 static gchar const *const grid_name[] = {
35 N_("Rectangular grid"),
36 N_("Axonometric grid")
37 };
38 static gchar const *const grid_svgname[] = {
39 "xygrid",
40 "axonomgrid"
41 };
44 // ##########################################################
45 // Grid CanvasItem
46 static void grid_canvasitem_class_init (GridCanvasItemClass *klass);
47 static void grid_canvasitem_init (GridCanvasItem *grid);
48 static void grid_canvasitem_destroy (GtkObject *object);
50 static void grid_canvasitem_update (SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags);
51 static void grid_canvasitem_render (SPCanvasItem *item, SPCanvasBuf *buf);
53 static SPCanvasItemClass * parent_class;
55 GtkType
56 grid_canvasitem_get_type (void)
57 {
58 static GtkType grid_canvasitem_type = 0;
60 if (!grid_canvasitem_type) {
61 GtkTypeInfo grid_canvasitem_info = {
62 "GridCanvasItem",
63 sizeof (GridCanvasItem),
64 sizeof (GridCanvasItemClass),
65 (GtkClassInitFunc) grid_canvasitem_class_init,
66 (GtkObjectInitFunc) grid_canvasitem_init,
67 NULL, NULL,
68 (GtkClassInitFunc) NULL
69 };
70 grid_canvasitem_type = gtk_type_unique (sp_canvas_item_get_type (), &grid_canvasitem_info);
71 }
72 return grid_canvasitem_type;
73 }
75 static void
76 grid_canvasitem_class_init (GridCanvasItemClass *klass)
77 {
78 GtkObjectClass *object_class;
79 SPCanvasItemClass *item_class;
81 object_class = (GtkObjectClass *) klass;
82 item_class = (SPCanvasItemClass *) klass;
84 parent_class = (SPCanvasItemClass*)gtk_type_class (sp_canvas_item_get_type ());
86 object_class->destroy = grid_canvasitem_destroy;
88 item_class->update = grid_canvasitem_update;
89 item_class->render = grid_canvasitem_render;
90 }
92 static void
93 grid_canvasitem_init (GridCanvasItem *griditem)
94 {
95 griditem->grid = NULL;
96 }
98 static void
99 grid_canvasitem_destroy (GtkObject *object)
100 {
101 g_return_if_fail (object != NULL);
102 g_return_if_fail (INKSCAPE_IS_GRID_CANVASITEM (object));
104 if (GTK_OBJECT_CLASS (parent_class)->destroy)
105 (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
106 }
108 /**
109 */
110 static void
111 grid_canvasitem_render (SPCanvasItem * item, SPCanvasBuf * buf)
112 {
113 GridCanvasItem *gridcanvasitem = INKSCAPE_GRID_CANVASITEM (item);
115 sp_canvas_prepare_buffer (buf);
117 if (gridcanvasitem->grid) gridcanvasitem->grid->Render(buf);
118 }
120 static void
121 grid_canvasitem_update (SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags)
122 {
123 GridCanvasItem *gridcanvasitem = INKSCAPE_GRID_CANVASITEM (item);
125 if (parent_class->update)
126 (* parent_class->update) (item, affine, flags);
128 if (gridcanvasitem->grid) {
129 gridcanvasitem->grid->Update(affine, flags);
131 sp_canvas_request_redraw (item->canvas,
132 -1000000, -1000000,
133 1000000, 1000000);
135 item->x1 = item->y1 = -1000000;
136 item->x2 = item->y2 = 1000000;
137 }
138 }
142 // ##########################################################
143 // CanvasGrid
145 static Inkscape::XML::NodeEventVector const _repr_events = {
146 NULL, /* child_added */
147 NULL, /* child_removed */
148 CanvasGrid::on_repr_attr_changed,
149 NULL, /* content_changed */
150 NULL /* order_changed */
151 };
153 CanvasGrid::CanvasGrid(SPNamedView * nv, Inkscape::XML::Node * in_repr, SPDocument *in_doc)
154 {
155 repr = in_repr;
156 doc = in_doc;
157 if (repr) {
158 repr->addListener (&_repr_events, this);
159 }
161 namedview = nv;
162 canvasitems = NULL;
163 }
165 CanvasGrid::~CanvasGrid()
166 {
167 if (repr) {
168 repr->removeListenerByData (this);
169 }
171 while (canvasitems) {
172 gtk_object_destroy(GTK_OBJECT(canvasitems->data));
173 canvasitems = g_slist_remove(canvasitems, canvasitems->data);
174 }
175 }
179 char const *
180 CanvasGrid::getName(GridType type)
181 {
182 return _(grid_name[type]);
183 }
185 char const *
186 CanvasGrid::getSVGName(GridType type)
187 {
188 return grid_svgname[type];
189 }
191 GridType
192 CanvasGrid::getGridTypeFromSVGName(char const *typestr)
193 {
194 if (!typestr) return GRID_RECTANGULAR;
196 gint t = 0;
197 for (t = GRID_MAXTYPENR; t >= 0; t--) { //this automatically defaults to grid0 which is rectangular grid
198 if (!strcmp(typestr, grid_svgname[t])) break;
199 }
200 return (GridType) t;
201 }
203 GridType
204 CanvasGrid::getGridTypeFromName(char const *typestr)
205 {
206 if (!typestr) return GRID_RECTANGULAR;
208 gint t = 0;
209 for (t = GRID_MAXTYPENR; t >= 0; t--) { //this automatically defaults to grid0 which is rectangular grid
210 if (!strcmp(typestr, _(grid_name[t]))) break;
211 }
212 return (GridType) t;
213 }
216 /*
217 * writes an <inkscape:grid> child to repr.
218 */
219 void
220 CanvasGrid::writeNewGridToRepr(Inkscape::XML::Node * repr, SPDocument * doc, GridType gridtype)
221 {
222 if (!repr) return;
223 if (gridtype > GRID_MAXTYPENR) return;
225 // first create the child xml node, then hook it to repr. This order is important, to not set off listeners to repr before the new node is complete.
227 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
228 Inkscape::XML::Node *newnode;
229 newnode = xml_doc->createElement("inkscape:grid");
230 newnode->setAttribute("type", getSVGName(gridtype));
232 repr->appendChild(newnode);
233 // Inkscape::GC::release(repr); FIX THIS. THIS SHOULD BE HERE!!!
235 sp_document_done(doc, SP_VERB_DIALOG_NAMEDVIEW, _("Create new grid"));
236 }
238 /*
239 * Creates a new CanvasGrid object of type gridtype
240 */
241 CanvasGrid*
242 CanvasGrid::NewGrid(SPNamedView * nv, Inkscape::XML::Node * repr, SPDocument * doc, GridType gridtype)
243 {
244 if (!repr) return NULL;
245 if (!doc) {
246 g_error("CanvasGrid::NewGrid - doc==NULL");
247 return NULL;
248 }
250 switch (gridtype) {
251 case GRID_RECTANGULAR:
252 return (CanvasGrid*) new CanvasXYGrid(nv, repr, doc);
253 case GRID_AXONOMETRIC:
254 return (CanvasGrid*) new CanvasAxonomGrid(nv, repr, doc);
255 }
257 return NULL;
258 }
261 /**
262 * creates a new grid canvasitem for the SPDesktop given as parameter. Keeps a link to this canvasitem in the canvasitems list.
263 */
264 GridCanvasItem *
265 CanvasGrid::createCanvasItem(SPDesktop * desktop)
266 {
267 if (!desktop) return NULL;
268 // Johan: I think for multiple desktops it is best if each has their own canvasitem,
269 // but share the same CanvasGrid object; that is what this function is for.
271 // check if there is already a canvasitem on this desktop linking to this grid
272 for (GSList *l = canvasitems; l != NULL; l = l->next) {
273 if ( sp_desktop_gridgroup(desktop) == SP_CANVAS_GROUP(SP_CANVAS_ITEM(l->data)->parent) ) {
274 return NULL;
275 }
276 }
278 GridCanvasItem * item = INKSCAPE_GRID_CANVASITEM( sp_canvas_item_new(sp_desktop_gridgroup(desktop), INKSCAPE_TYPE_GRID_CANVASITEM, NULL) );
279 item->grid = this;
280 sp_canvas_item_show(SP_CANVAS_ITEM(item));
282 gtk_object_ref(GTK_OBJECT(item)); // since we're keeping a link to this item, we need to bump up the ref count
283 canvasitems = g_slist_prepend(canvasitems, item);
285 return item;
286 }
288 void
289 CanvasGrid::on_repr_attr_changed(Inkscape::XML::Node *repr, gchar const *key, gchar const *oldval, gchar const *newval, bool is_interactive, void *data)
290 {
291 if (!data)
292 return;
294 ((CanvasGrid*) data)->onReprAttrChanged(repr, key, oldval, newval, is_interactive);
295 }
299 // ##########################################################
300 // CanvasXYGrid
303 /**
304 * "attach_all" function
305 * A DIRECT COPY-PASTE FROM DOCUMENT-PROPERTIES.CPP TO QUICKLY GET RESULTS
306 *
307 * Helper function that attachs widgets in a 3xn table. The widgets come in an
308 * array that has two entries per table row. The two entries code for four
309 * possible cases: (0,0) means insert space in first column; (0, non-0) means
310 * widget in columns 2-3; (non-0, 0) means label in columns 1-3; and
311 * (non-0, non-0) means two widgets in columns 2 and 3.
312 **/
313 #define SPACE_SIZE_X 15
314 #define SPACE_SIZE_Y 10
315 static inline void
316 attach_all(Gtk::Table &table, Gtk::Widget const *const arr[], unsigned size, int start = 0)
317 {
318 for (unsigned i=0, r=start; i<size/sizeof(Gtk::Widget*); i+=2) {
319 if (arr[i] && arr[i+1]) {
320 table.attach (const_cast<Gtk::Widget&>(*arr[i]), 1, 2, r, r+1,
321 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
322 table.attach (const_cast<Gtk::Widget&>(*arr[i+1]), 2, 3, r, r+1,
323 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
324 } else {
325 if (arr[i+1]) {
326 table.attach (const_cast<Gtk::Widget&>(*arr[i+1]), 1, 3, r, r+1,
327 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
328 } else if (arr[i]) {
329 Gtk::Label& label = reinterpret_cast<Gtk::Label&> (const_cast<Gtk::Widget&>(*arr[i]));
330 label.set_alignment (0.0);
331 table.attach (label, 0, 3, r, r+1,
332 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
333 } else {
334 Gtk::HBox *space = manage (new Gtk::HBox);
335 space->set_size_request (SPACE_SIZE_X, SPACE_SIZE_Y);
336 table.attach (*space, 0, 1, r, r+1,
337 (Gtk::AttachOptions)0, (Gtk::AttachOptions)0,0,0);
338 }
339 }
340 ++r;
341 }
342 }
344 CanvasXYGrid::CanvasXYGrid (SPNamedView * nv, Inkscape::XML::Node * in_repr, SPDocument * in_doc)
345 : CanvasGrid(nv, in_repr, in_doc), table(1, 1)
346 {
347 origin[NR::X] = origin[NR::Y] = 0.0;
348 color = DEFAULTGRIDCOLOR;
349 empcolor = DEFAULTGRIDEMPCOLOR;
350 empspacing = 5;
351 spacing[NR::X] = spacing[NR::Y] = 1.0;
352 gridunit = &sp_unit_get_by_id(SP_UNIT_PX);
353 render_dotted = false;
355 snapper = new CanvasXYGridSnapper(this, namedview, 0);
357 // initialize widgets:
358 vbox.set_border_width(2);
359 table.set_spacings(2);
360 vbox.pack_start(table, false, false, 0);
362 Inkscape::UI::Widget::ScalarUnit * sutemp;
363 _rumg.init (_("Grid _units:"), "units", _wr, repr, doc);
364 _rsu_ox.init (_("_Origin X:"), _("X coordinate of grid origin"),
365 "originx", _rumg, _wr, repr, doc);
366 sutemp = _rsu_ox.getSU();
367 sutemp->setDigits(4);
368 sutemp->setIncrements(0.1, 1.0);
369 _rsu_oy.init (_("O_rigin Y:"), _("Y coordinate of grid origin"),
370 "originy", _rumg, _wr, repr, doc);
371 sutemp = _rsu_oy.getSU();
372 sutemp->setDigits(4);
373 sutemp->setIncrements(0.1, 1.0);
374 _rsu_sx.init (_("Spacing _X:"), _("Distance between vertical grid lines"),
375 "spacingx", _rumg, _wr, repr, doc);
376 sutemp = _rsu_sx.getSU();
377 sutemp->setDigits(4);
378 sutemp->setIncrements(0.1, 1.0);
379 _rsu_sy.init (_("Spacing _Y:"), _("Distance between horizontal grid lines"),
380 "spacingy", _rumg, _wr, repr, doc);
381 sutemp = _rsu_sy.getSU();
382 sutemp->setDigits(4);
383 sutemp->setIncrements(0.1, 1.0);
384 _rcp_gcol.init (_("Grid line _color:"), _("Grid line color"),
385 _("Color of grid lines"), "color", "opacity", _wr, repr, doc);
386 _rcp_gmcol.init (_("Ma_jor grid line color:"), _("Major grid line color"),
387 _("Color of the major (highlighted) grid lines"),
388 "empcolor", "empopacity", _wr, repr, doc);
389 _rsi.init (_("_Major grid line every:"), _("lines"), "empspacing", _wr, repr, doc);
390 _rcb_dotted.init ( _("_Show dots instead of lines"),
391 _("If set, displays dots at gridpoints instead of gridlines"),
392 "dotted", _wr, false, repr, doc);
394 Gtk::Widget const *const widget_array[] = {
395 _rumg._label, _rumg._sel,
396 0, _rsu_ox.getSU(),
397 0, _rsu_oy.getSU(),
398 0, _rsu_sx.getSU(),
399 0, _rsu_sy.getSU(),
400 _rcp_gcol._label, _rcp_gcol._cp,
401 0, 0,
402 _rcp_gmcol._label, _rcp_gmcol._cp,
403 _rsi._label, &_rsi._hbox,
404 0, _rcb_dotted._button,
405 };
407 attach_all (table, widget_array, sizeof(widget_array));
409 vbox.show();
411 if (repr) readRepr();
412 updateWidgets();
413 }
415 CanvasXYGrid::~CanvasXYGrid ()
416 {
417 if (snapper) delete snapper;
418 }
421 /* fixme: Collect all these length parsing methods and think common sane API */
423 static gboolean
424 sp_nv_read_length(gchar const *str, guint base, gdouble *val, SPUnit const **unit)
425 {
426 if (!str) {
427 return FALSE;
428 }
430 gchar *u;
431 gdouble v = g_ascii_strtod(str, &u);
432 if (!u) {
433 return FALSE;
434 }
435 while (isspace(*u)) {
436 u += 1;
437 }
439 if (!*u) {
440 /* No unit specified - keep default */
441 *val = v;
442 return TRUE;
443 }
445 if (base & SP_UNIT_DEVICE) {
446 if (u[0] && u[1] && !isalnum(u[2]) && !strncmp(u, "px", 2)) {
447 *unit = &sp_unit_get_by_id(SP_UNIT_PX);
448 *val = v;
449 return TRUE;
450 }
451 }
453 if (base & SP_UNIT_ABSOLUTE) {
454 if (!strncmp(u, "pt", 2)) {
455 *unit = &sp_unit_get_by_id(SP_UNIT_PT);
456 } else if (!strncmp(u, "mm", 2)) {
457 *unit = &sp_unit_get_by_id(SP_UNIT_MM);
458 } else if (!strncmp(u, "cm", 2)) {
459 *unit = &sp_unit_get_by_id(SP_UNIT_CM);
460 } else if (!strncmp(u, "m", 1)) {
461 *unit = &sp_unit_get_by_id(SP_UNIT_M);
462 } else if (!strncmp(u, "in", 2)) {
463 *unit = &sp_unit_get_by_id(SP_UNIT_IN);
464 } else {
465 return FALSE;
466 }
467 *val = v;
468 return TRUE;
469 }
471 return FALSE;
472 }
474 static gboolean sp_nv_read_opacity(gchar const *str, guint32 *color)
475 {
476 if (!str) {
477 return FALSE;
478 }
480 gchar *u;
481 gdouble v = g_ascii_strtod(str, &u);
482 if (!u) {
483 return FALSE;
484 }
485 v = CLAMP(v, 0.0, 1.0);
487 *color = (*color & 0xffffff00) | (guint32) floor(v * 255.9999);
489 return TRUE;
490 }
492 /** If the passed scalar is invalid (<=0), then set the widget and the scalar
493 to use the given old value.
495 @param oldVal Old value to use if the new one is invalid.
496 @param pTarget The scalar to validate.
497 @param widget Widget associated with the scalar.
498 */
499 static void validateScalar(double oldVal,
500 double* pTarget,
501 Inkscape::UI::Widget::RegisteredScalarUnit& widget)
502 {
503 // Avoid nullness.
504 if ( pTarget == NULL )
505 return;
507 // Invalid new value?
508 if ( *pTarget <= 0 ) {
509 // If the old value is somehow invalid as well, then default to 1.
510 if ( oldVal <= 0 )
511 oldVal = 1;
513 // Reset the scalar and associated widget to the old value.
514 *pTarget = oldVal;
515 widget.setValue( *pTarget);
516 } //if
518 } //validateScalar
521 /** If the passed int is invalid (<=0), then set the widget and the int
522 to use the given old value.
524 @param oldVal Old value to use if the new one is invalid.
525 @param pTarget The int to validate.
526 @param widget Widget associated with the int.
527 */
528 static void validateInt(gint oldVal,
529 gint* pTarget,
530 Inkscape::UI::Widget::RegisteredSuffixedInteger& widget)
531 {
532 // Avoid nullness.
533 if ( pTarget == NULL )
534 return;
536 // Invalid new value?
537 if ( *pTarget <= 0 ) {
538 // If the old value is somehow invalid as well, then default to 1.
539 if ( oldVal <= 0 )
540 oldVal = 1;
542 // Reset the int and associated widget to the old value.
543 *pTarget = oldVal;
544 widget.setValue( *pTarget);
545 } //if
547 } //validateInt
549 void
550 CanvasXYGrid::readRepr()
551 {
552 gchar const *value;
553 if ( (value = repr->attribute("originx")) ) {
554 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &origin[NR::X], &gridunit);
555 origin[NR::X] = sp_units_get_pixels(origin[NR::X], *(gridunit));
557 }
558 if ( (value = repr->attribute("originy")) ) {
559 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &origin[NR::Y], &gridunit);
560 origin[NR::Y] = sp_units_get_pixels(origin[NR::Y], *(gridunit));
561 }
563 if ( (value = repr->attribute("spacingx")) ) {
564 double oldVal = spacing[NR::X];
565 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &spacing[NR::X], &gridunit);
566 validateScalar( oldVal, &spacing[NR::X], _rsu_sx );
567 spacing[NR::X] = sp_units_get_pixels(spacing[NR::X], *(gridunit));
569 }
570 if ( (value = repr->attribute("spacingy")) ) {
571 double oldVal = spacing[NR::Y];
572 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &spacing[NR::Y], &gridunit);
573 validateScalar( oldVal, &spacing[NR::Y], _rsu_sy );
574 spacing[NR::Y] = sp_units_get_pixels(spacing[NR::Y], *(gridunit));
576 }
578 if ( (value = repr->attribute("color")) ) {
579 color = (color & 0xff) | sp_svg_read_color(value, color);
580 }
582 if ( (value = repr->attribute("empcolor")) ) {
583 empcolor = (empcolor & 0xff) | sp_svg_read_color(value, empcolor);
584 }
586 if ( (value = repr->attribute("opacity")) ) {
587 sp_nv_read_opacity(value, &color);
588 }
589 if ( (value = repr->attribute("empopacity")) ) {
590 sp_nv_read_opacity(value, &empcolor);
591 }
593 if ( (value = repr->attribute("empspacing")) ) {
594 gint oldVal = empspacing;
595 empspacing = atoi(value);
596 validateInt( oldVal, &empspacing, _rsi );
597 }
599 if ( (value = repr->attribute("dotted")) ) {
600 render_dotted = (strcmp(value,"true") == 0);
601 }
603 for (GSList *l = canvasitems; l != NULL; l = l->next) {
604 sp_canvas_item_request_update ( SP_CANVAS_ITEM(l->data) );
605 }
607 return;
608 }
610 /**
611 * Called when XML node attribute changed; updates dialog widgets if change was not done by widgets themselves.
612 */
613 void
614 CanvasXYGrid::onReprAttrChanged(Inkscape::XML::Node */*repr*/, gchar const */*key*/, gchar const */*oldval*/, gchar const */*newval*/, bool /*is_interactive*/)
615 {
616 readRepr();
618 if ( ! (_wr.isUpdating()) )
619 updateWidgets();
620 }
625 Gtk::Widget &
626 CanvasXYGrid::getWidget()
627 {
628 return vbox;
629 }
632 /**
633 * Update dialog widgets from object's values.
634 */
635 void
636 CanvasXYGrid::updateWidgets()
637 {
638 if (_wr.isUpdating()) return;
640 _wr.setUpdating (true);
642 _rumg.setUnit (gridunit);
644 gdouble val;
645 val = origin[NR::X];
646 val = sp_pixels_get_units (val, *(gridunit));
647 _rsu_ox.setValue (val);
648 val = origin[NR::Y];
649 val = sp_pixels_get_units (val, *(gridunit));
650 _rsu_oy.setValue (val);
651 val = spacing[NR::X];
652 double gridx = sp_pixels_get_units (val, *(gridunit));
653 _rsu_sx.setValue (gridx);
654 val = spacing[NR::Y];
655 double gridy = sp_pixels_get_units (val, *(gridunit));
656 _rsu_sy.setValue (gridy);
658 _rcp_gcol.setRgba32 (color);
659 _rcp_gmcol.setRgba32 (empcolor);
660 _rsi.setValue (empspacing);
662 _wr.setUpdating (false);
664 return;
665 }
669 void
670 CanvasXYGrid::Update (NR::Matrix const &affine, unsigned int /*flags*/)
671 {
672 ow = origin * affine;
673 sw = spacing * affine;
674 sw -= NR::Point(affine[4], affine[5]);
676 for(int dim = 0; dim < 2; dim++) {
677 gint scaling_factor = empspacing;
679 if (scaling_factor <= 1)
680 scaling_factor = 5;
682 scaled[dim] = FALSE;
683 sw[dim] = fabs (sw[dim]);
684 while (sw[dim] < 8.0) {
685 scaled[dim] = TRUE;
686 sw[dim] *= scaling_factor;
687 /* First pass, go up to the major line spacing, then
688 keep increasing by two. */
689 scaling_factor = 2;
690 }
691 }
692 }
695 static void
696 grid_hline (SPCanvasBuf *buf, gint y, gint xs, gint xe, guint32 rgba)
697 {
698 if ((y >= buf->rect.y0) && (y < buf->rect.y1)) {
699 guint r, g, b, a;
700 gint x0, x1, x;
701 guchar *p;
702 r = NR_RGBA32_R (rgba);
703 g = NR_RGBA32_G (rgba);
704 b = NR_RGBA32_B (rgba);
705 a = NR_RGBA32_A (rgba);
706 x0 = MAX (buf->rect.x0, xs);
707 x1 = MIN (buf->rect.x1, xe + 1);
708 p = buf->buf + (y - buf->rect.y0) * buf->buf_rowstride + (x0 - buf->rect.x0) * 3;
709 for (x = x0; x < x1; x++) {
710 p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
711 p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
712 p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
713 p += 3;
714 }
715 }
716 }
718 static void
719 grid_vline (SPCanvasBuf *buf, gint x, gint ys, gint ye, guint32 rgba)
720 {
721 if ((x >= buf->rect.x0) && (x < buf->rect.x1)) {
722 guint r, g, b, a;
723 gint y0, y1, y;
724 guchar *p;
725 r = NR_RGBA32_R(rgba);
726 g = NR_RGBA32_G (rgba);
727 b = NR_RGBA32_B (rgba);
728 a = NR_RGBA32_A (rgba);
729 y0 = MAX (buf->rect.y0, ys);
730 y1 = MIN (buf->rect.y1, ye + 1);
731 p = buf->buf + (y0 - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;
732 for (y = y0; y < y1; y++) {
733 p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
734 p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
735 p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
736 p += buf->buf_rowstride;
737 }
738 }
739 }
741 static void
742 grid_dot (SPCanvasBuf *buf, gint x, gint y, guint32 rgba)
743 {
744 if ( (y >= buf->rect.y0) && (y < buf->rect.y1)
745 && (x >= buf->rect.x0) && (x < buf->rect.x1) ) {
746 guint r, g, b, a;
747 guchar *p;
748 r = NR_RGBA32_R (rgba);
749 g = NR_RGBA32_G (rgba);
750 b = NR_RGBA32_B (rgba);
751 a = NR_RGBA32_A (rgba);
752 p = buf->buf + (y - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;
753 p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
754 p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
755 p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
756 }
757 }
759 void
760 CanvasXYGrid::Render (SPCanvasBuf *buf)
761 {
762 gdouble const sxg = floor ((buf->rect.x0 - ow[NR::X]) / sw[NR::X]) * sw[NR::X] + ow[NR::X];
763 gint const xlinestart = (gint) Inkscape::round((sxg - ow[NR::X]) / sw[NR::X]);
764 gdouble const syg = floor ((buf->rect.y0 - ow[NR::Y]) / sw[NR::Y]) * sw[NR::Y] + ow[NR::Y];
765 gint const ylinestart = (gint) Inkscape::round((syg - ow[NR::Y]) / sw[NR::Y]);
767 if (!render_dotted) {
768 gint ylinenum;
769 gdouble y;
770 for (y = syg, ylinenum = ylinestart; y < buf->rect.y1; y += sw[NR::Y], ylinenum++) {
771 gint const y0 = (gint) Inkscape::round(y);
773 if (!scaled[NR::Y] && (ylinenum % empspacing) == 0) {
774 grid_hline (buf, y0, buf->rect.x0, buf->rect.x1 - 1, empcolor);
775 } else {
776 grid_hline (buf, y0, buf->rect.x0, buf->rect.x1 - 1, color);
777 }
778 }
780 gint xlinenum;
781 gdouble x;
782 for (x = sxg, xlinenum = xlinestart; x < buf->rect.x1; x += sw[NR::X], xlinenum++) {
783 gint const ix = (gint) Inkscape::round(x);
784 if (!scaled[NR::X] && (xlinenum % empspacing) == 0) {
785 grid_vline (buf, ix, buf->rect.y0, buf->rect.y1, empcolor);
786 } else {
787 grid_vline (buf, ix, buf->rect.y0, buf->rect.y1, color);
788 }
789 }
790 } else {
791 gint ylinenum;
792 gdouble y;
793 for (y = syg, ylinenum = ylinestart; y < buf->rect.y1; y += sw[NR::Y], ylinenum++) {
794 gint const iy = (gint) Inkscape::round(y);
796 gint xlinenum;
797 gdouble x;
798 for (x = sxg, xlinenum = xlinestart; x < buf->rect.x1; x += sw[NR::X], xlinenum++) {
799 gint const ix = (gint) Inkscape::round(x);
800 if ( (!scaled[NR::X] && (xlinenum % empspacing) == 0)
801 || (!scaled[NR::Y] && (ylinenum % empspacing) == 0) )
802 {
803 grid_dot (buf, ix, iy, empcolor | (guint32)0x000000FF); // put alpha to max value
804 } else {
805 grid_dot (buf, ix, iy, color | (guint32)0x000000FF); // put alpha to max value
806 }
807 }
809 }
810 }
811 }
816 /**
817 * \return x rounded to the nearest multiple of c1 plus c0.
818 *
819 * \note
820 * If c1==0 (and c0 is finite), then returns +/-inf. This makes grid spacing of zero
821 * mean "ignore the grid in this dimention". We're currently discussing "good" semantics
822 * for guide/grid snapping.
823 */
825 /* FIXME: move this somewhere else, perhaps */
826 static double round_to_nearest_multiple_plus(double x, double const c1, double const c0)
827 {
828 return floor((x - c0) / c1 + .5) * c1 + c0;
829 }
831 CanvasXYGridSnapper::CanvasXYGridSnapper(CanvasXYGrid *grid, SPNamedView const *nv, NR::Coord const d) : LineSnapper(nv, d)
832 {
833 this->grid = grid;
834 }
836 LineSnapper::LineList
837 CanvasXYGridSnapper::_getSnapLines(NR::Point const &p) const
838 {
839 LineList s;
841 if ( grid == NULL ) {
842 return s;
843 }
845 for (unsigned int i = 0; i < 2; ++i) {
847 /* This is to make sure we snap to only visible grid lines */
848 double scaled_spacing = grid->sw[i]; // this is spacing of visible lines if screen pixels
850 // convert screen pixels to px
851 // FIXME: after we switch to snapping dist in screen pixels, this will be unnecessary
852 if (SP_ACTIVE_DESKTOP) {
853 scaled_spacing /= SP_ACTIVE_DESKTOP->current_zoom();
854 }
856 NR::Coord const rounded = round_to_nearest_multiple_plus(p[i],
857 scaled_spacing,
858 grid->origin[i]);
860 s.push_back(std::make_pair(NR::Dim2(i), rounded));
861 }
863 return s;
864 }
866 void CanvasXYGridSnapper::_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
867 {
868 SnappedLine dummy = SnappedLine(snapped_point, snapped_distance, normal_to_line, point_on_line);
869 sc.grid_lines.push_back(dummy);
870 }
875 }; /* namespace Inkscape */
878 /*
879 Local Variables:
880 mode:c++
881 c-file-style:"stroustrup"
882 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
883 indent-tabs-mode:nil
884 fill-column:99
885 End:
886 */
887 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :