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 _rumg.init (_("Grid _units:"), "units", _wr, repr, doc);
363 _rsu_ox.init (_("_Origin X:"), _("X coordinate of grid origin"),
364 "originx", _rumg, _wr, repr, doc);
365 _rsu_oy.init (_("O_rigin Y:"), _("Y coordinate of grid origin"),
366 "originy", _rumg, _wr, repr, doc);
367 _rsu_sx.init (_("Spacing _X:"), _("Distance between vertical grid lines"),
368 "spacingx", _rumg, _wr, repr, doc);
369 _rsu_sy.init (_("Spacing _Y:"), _("Distance between horizontal grid lines"),
370 "spacingy", _rumg, _wr, repr, doc);
371 _rcp_gcol.init (_("Grid line _color:"), _("Grid line color"),
372 _("Color of grid lines"), "color", "opacity", _wr, repr, doc);
373 _rcp_gmcol.init (_("Ma_jor grid line color:"), _("Major grid line color"),
374 _("Color of the major (highlighted) grid lines"),
375 "empcolor", "empopacity", _wr, repr, doc);
376 _rsi.init (_("_Major grid line every:"), _("lines"), "empspacing", _wr, repr, doc);
377 _rcb_dotted.init ( _("_Show dots instead of lines"),
378 _("If set, displays dots at gridpoints instead of gridlines"),
379 "dotted", _wr, false, repr, doc);
381 Gtk::Widget const *const widget_array[] = {
382 _rumg._label, _rumg._sel,
383 0, _rsu_ox.getSU(),
384 0, _rsu_oy.getSU(),
385 0, _rsu_sx.getSU(),
386 0, _rsu_sy.getSU(),
387 _rcp_gcol._label, _rcp_gcol._cp,
388 0, 0,
389 _rcp_gmcol._label, _rcp_gmcol._cp,
390 _rsi._label, &_rsi._hbox,
391 0, _rcb_dotted._button,
392 };
394 attach_all (table, widget_array, sizeof(widget_array));
396 vbox.show();
398 if (repr) readRepr();
399 updateWidgets();
400 }
402 CanvasXYGrid::~CanvasXYGrid ()
403 {
404 if (snapper) delete snapper;
405 }
408 /* fixme: Collect all these length parsing methods and think common sane API */
410 static gboolean
411 sp_nv_read_length(gchar const *str, guint base, gdouble *val, SPUnit const **unit)
412 {
413 if (!str) {
414 return FALSE;
415 }
417 gchar *u;
418 gdouble v = g_ascii_strtod(str, &u);
419 if (!u) {
420 return FALSE;
421 }
422 while (isspace(*u)) {
423 u += 1;
424 }
426 if (!*u) {
427 /* No unit specified - keep default */
428 *val = v;
429 return TRUE;
430 }
432 if (base & SP_UNIT_DEVICE) {
433 if (u[0] && u[1] && !isalnum(u[2]) && !strncmp(u, "px", 2)) {
434 *unit = &sp_unit_get_by_id(SP_UNIT_PX);
435 *val = v;
436 return TRUE;
437 }
438 }
440 if (base & SP_UNIT_ABSOLUTE) {
441 if (!strncmp(u, "pt", 2)) {
442 *unit = &sp_unit_get_by_id(SP_UNIT_PT);
443 } else if (!strncmp(u, "mm", 2)) {
444 *unit = &sp_unit_get_by_id(SP_UNIT_MM);
445 } else if (!strncmp(u, "cm", 2)) {
446 *unit = &sp_unit_get_by_id(SP_UNIT_CM);
447 } else if (!strncmp(u, "m", 1)) {
448 *unit = &sp_unit_get_by_id(SP_UNIT_M);
449 } else if (!strncmp(u, "in", 2)) {
450 *unit = &sp_unit_get_by_id(SP_UNIT_IN);
451 } else {
452 return FALSE;
453 }
454 *val = v;
455 return TRUE;
456 }
458 return FALSE;
459 }
461 static gboolean sp_nv_read_opacity(gchar const *str, guint32 *color)
462 {
463 if (!str) {
464 return FALSE;
465 }
467 gchar *u;
468 gdouble v = g_ascii_strtod(str, &u);
469 if (!u) {
470 return FALSE;
471 }
472 v = CLAMP(v, 0.0, 1.0);
474 *color = (*color & 0xffffff00) | (guint32) floor(v * 255.9999);
476 return TRUE;
477 }
479 /** If the passed scalar is invalid (<=0), then set the widget and the scalar
480 to use the given old value.
482 @param oldVal Old value to use if the new one is invalid.
483 @param pTarget The scalar to validate.
484 @param widget Widget associated with the scalar.
485 */
486 static void validateScalar(double oldVal,
487 double* pTarget,
488 Inkscape::UI::Widget::RegisteredScalarUnit& widget)
489 {
490 // Avoid nullness.
491 if ( pTarget == NULL )
492 return;
494 // Invalid new value?
495 if ( *pTarget <= 0 ) {
496 // If the old value is somehow invalid as well, then default to 1.
497 if ( oldVal <= 0 )
498 oldVal = 1;
500 // Reset the scalar and associated widget to the old value.
501 *pTarget = oldVal;
502 widget.setValue( *pTarget);
503 } //if
505 } //validateScalar
508 /** If the passed int is invalid (<=0), then set the widget and the int
509 to use the given old value.
511 @param oldVal Old value to use if the new one is invalid.
512 @param pTarget The int to validate.
513 @param widget Widget associated with the int.
514 */
515 static void validateInt(gint oldVal,
516 gint* pTarget,
517 Inkscape::UI::Widget::RegisteredSuffixedInteger& widget)
518 {
519 // Avoid nullness.
520 if ( pTarget == NULL )
521 return;
523 // Invalid new value?
524 if ( *pTarget <= 0 ) {
525 // If the old value is somehow invalid as well, then default to 1.
526 if ( oldVal <= 0 )
527 oldVal = 1;
529 // Reset the int and associated widget to the old value.
530 *pTarget = oldVal;
531 widget.setValue( *pTarget);
532 } //if
534 } //validateInt
536 void
537 CanvasXYGrid::readRepr()
538 {
539 char buff[100];
540 gchar const *value;
541 if ( (value = repr->attribute("originx")) ) {
542 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &origin[NR::X], &gridunit);
543 origin[NR::X] = sp_units_get_pixels(origin[NR::X], *(gridunit));
545 }
546 if ( (value = repr->attribute("originy")) ) {
547 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &origin[NR::Y], &gridunit);
548 origin[NR::Y] = sp_units_get_pixels(origin[NR::Y], *(gridunit));
549 }
551 if ( (value = repr->attribute("spacingx")) ) {
552 double oldVal = spacing[NR::X];
553 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &spacing[NR::X], &gridunit);
554 validateScalar( oldVal, &spacing[NR::X], _rsu_sx );
555 spacing[NR::X] = sp_units_get_pixels(spacing[NR::X], *(gridunit));
557 }
558 if ( (value = repr->attribute("spacingy")) ) {
559 double oldVal = spacing[NR::Y];
560 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &spacing[NR::Y], &gridunit);
561 validateScalar( oldVal, &spacing[NR::Y], _rsu_sy );
562 spacing[NR::Y] = sp_units_get_pixels(spacing[NR::Y], *(gridunit));
564 }
566 if ( (value = repr->attribute("color")) ) {
567 color = (color & 0xff) | sp_svg_read_color(value, color);
568 }
570 if ( (value = repr->attribute("empcolor")) ) {
571 empcolor = (empcolor & 0xff) | sp_svg_read_color(value, empcolor);
572 }
574 if ( (value = repr->attribute("opacity")) ) {
575 sp_nv_read_opacity(value, &color);
576 }
577 if ( (value = repr->attribute("empopacity")) ) {
578 sp_nv_read_opacity(value, &empcolor);
579 }
581 if ( (value = repr->attribute("empspacing")) ) {
582 gint oldVal = empspacing;
583 empspacing = atoi(value);
584 validateInt( oldVal, &empspacing, _rsi );
585 }
587 if ( (value = repr->attribute("dotted")) ) {
588 render_dotted = (strcmp(value,"true") == 0);
589 }
591 for (GSList *l = canvasitems; l != NULL; l = l->next) {
592 sp_canvas_item_request_update ( SP_CANVAS_ITEM(l->data) );
593 }
595 return;
596 }
598 /**
599 * Called when XML node attribute changed; updates dialog widgets if change was not done by widgets themselves.
600 */
601 void
602 CanvasXYGrid::onReprAttrChanged(Inkscape::XML::Node *repr, gchar const *key, gchar const *oldval, gchar const *newval, bool is_interactive)
603 {
604 readRepr();
606 if ( ! (_wr.isUpdating()) )
607 updateWidgets();
608 }
613 Gtk::Widget &
614 CanvasXYGrid::getWidget()
615 {
616 return vbox;
617 }
620 /**
621 * Update dialog widgets from object's values.
622 */
623 void
624 CanvasXYGrid::updateWidgets()
625 {
626 if (_wr.isUpdating()) return;
628 _wr.setUpdating (true);
630 _rumg.setUnit (gridunit);
632 gdouble val;
633 val = origin[NR::X];
634 val = sp_pixels_get_units (val, *(gridunit));
635 _rsu_ox.setValue (val);
636 val = origin[NR::Y];
637 val = sp_pixels_get_units (val, *(gridunit));
638 _rsu_oy.setValue (val);
639 val = spacing[NR::X];
640 double gridx = sp_pixels_get_units (val, *(gridunit));
641 _rsu_sx.setValue (gridx);
642 val = spacing[NR::Y];
643 double gridy = sp_pixels_get_units (val, *(gridunit));
644 _rsu_sy.setValue (gridy);
646 _rcp_gcol.setRgba32 (color);
647 _rcp_gmcol.setRgba32 (empcolor);
648 _rsi.setValue (empspacing);
650 _wr.setUpdating (false);
652 return;
653 }
657 void
658 CanvasXYGrid::Update (NR::Matrix const &affine, unsigned int flags)
659 {
660 ow = origin * affine;
661 sw = spacing * affine;
662 sw -= NR::Point(affine[4], affine[5]);
664 for(int dim = 0; dim < 2; dim++) {
665 gint scaling_factor = empspacing;
667 if (scaling_factor <= 1)
668 scaling_factor = 5;
670 scaled[dim] = FALSE;
671 sw[dim] = fabs (sw[dim]);
672 while (sw[dim] < 8.0) {
673 scaled[dim] = TRUE;
674 sw[dim] *= scaling_factor;
675 /* First pass, go up to the major line spacing, then
676 keep increasing by two. */
677 scaling_factor = 2;
678 }
679 }
680 }
683 static void
684 grid_hline (SPCanvasBuf *buf, gint y, gint xs, gint xe, guint32 rgba)
685 {
686 if ((y >= buf->rect.y0) && (y < buf->rect.y1)) {
687 guint r, g, b, a;
688 gint x0, x1, x;
689 guchar *p;
690 r = NR_RGBA32_R (rgba);
691 g = NR_RGBA32_G (rgba);
692 b = NR_RGBA32_B (rgba);
693 a = NR_RGBA32_A (rgba);
694 x0 = MAX (buf->rect.x0, xs);
695 x1 = MIN (buf->rect.x1, xe + 1);
696 p = buf->buf + (y - buf->rect.y0) * buf->buf_rowstride + (x0 - buf->rect.x0) * 3;
697 for (x = x0; x < x1; x++) {
698 p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
699 p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
700 p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
701 p += 3;
702 }
703 }
704 }
706 static void
707 grid_vline (SPCanvasBuf *buf, gint x, gint ys, gint ye, guint32 rgba)
708 {
709 if ((x >= buf->rect.x0) && (x < buf->rect.x1)) {
710 guint r, g, b, a;
711 gint y0, y1, y;
712 guchar *p;
713 r = NR_RGBA32_R(rgba);
714 g = NR_RGBA32_G (rgba);
715 b = NR_RGBA32_B (rgba);
716 a = NR_RGBA32_A (rgba);
717 y0 = MAX (buf->rect.y0, ys);
718 y1 = MIN (buf->rect.y1, ye + 1);
719 p = buf->buf + (y0 - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;
720 for (y = y0; y < y1; y++) {
721 p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
722 p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
723 p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
724 p += buf->buf_rowstride;
725 }
726 }
727 }
729 static void
730 grid_dot (SPCanvasBuf *buf, gint x, gint y, guint32 rgba)
731 {
732 if ( (y >= buf->rect.y0) && (y < buf->rect.y1)
733 && (x >= buf->rect.x0) && (x < buf->rect.x1) ) {
734 guint r, g, b, a;
735 guchar *p;
736 r = NR_RGBA32_R (rgba);
737 g = NR_RGBA32_G (rgba);
738 b = NR_RGBA32_B (rgba);
739 a = NR_RGBA32_A (rgba);
740 p = buf->buf + (y - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;
741 p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
742 p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
743 p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
744 }
745 }
747 void
748 CanvasXYGrid::Render (SPCanvasBuf *buf)
749 {
750 gdouble const sxg = floor ((buf->rect.x0 - ow[NR::X]) / sw[NR::X]) * sw[NR::X] + ow[NR::X];
751 gint const xlinestart = (gint) Inkscape::round((sxg - ow[NR::X]) / sw[NR::X]);
752 gdouble const syg = floor ((buf->rect.y0 - ow[NR::Y]) / sw[NR::Y]) * sw[NR::Y] + ow[NR::Y];
753 gint const ylinestart = (gint) Inkscape::round((syg - ow[NR::Y]) / sw[NR::Y]);
755 if (!render_dotted) {
756 gint ylinenum;
757 gdouble y;
758 for (y = syg, ylinenum = ylinestart; y < buf->rect.y1; y += sw[NR::Y], ylinenum++) {
759 gint const y0 = (gint) Inkscape::round(y);
761 if (!scaled[NR::Y] && (ylinenum % empspacing) == 0) {
762 grid_hline (buf, y0, buf->rect.x0, buf->rect.x1 - 1, empcolor);
763 } else {
764 grid_hline (buf, y0, buf->rect.x0, buf->rect.x1 - 1, color);
765 }
766 }
768 gint xlinenum;
769 gdouble x;
770 for (x = sxg, xlinenum = xlinestart; x < buf->rect.x1; x += sw[NR::X], xlinenum++) {
771 gint const ix = (gint) Inkscape::round(x);
772 if (!scaled[NR::X] && (xlinenum % empspacing) == 0) {
773 grid_vline (buf, ix, buf->rect.y0, buf->rect.y1, empcolor);
774 } else {
775 grid_vline (buf, ix, buf->rect.y0, buf->rect.y1, color);
776 }
777 }
778 } else {
779 gint ylinenum;
780 gdouble y;
781 for (y = syg, ylinenum = ylinestart; y < buf->rect.y1; y += sw[NR::Y], ylinenum++) {
782 gint const iy = (gint) Inkscape::round(y);
784 gint xlinenum;
785 gdouble x;
786 for (x = sxg, xlinenum = xlinestart; x < buf->rect.x1; x += sw[NR::X], xlinenum++) {
787 gint const ix = (gint) Inkscape::round(x);
788 if ( (!scaled[NR::X] && (xlinenum % empspacing) == 0)
789 || (!scaled[NR::Y] && (ylinenum % empspacing) == 0) )
790 {
791 grid_dot (buf, ix, iy, empcolor | (guint32)0x000000FF); // put alpha to max value
792 } else {
793 grid_dot (buf, ix, iy, color | (guint32)0x000000FF); // put alpha to max value
794 }
795 }
797 }
798 }
799 }
804 /**
805 * \return x rounded to the nearest multiple of c1 plus c0.
806 *
807 * \note
808 * If c1==0 (and c0 is finite), then returns +/-inf. This makes grid spacing of zero
809 * mean "ignore the grid in this dimention". We're currently discussing "good" semantics
810 * for guide/grid snapping.
811 */
813 /* FIXME: move this somewhere else, perhaps */
814 static double round_to_nearest_multiple_plus(double x, double const c1, double const c0)
815 {
816 return floor((x - c0) / c1 + .5) * c1 + c0;
817 }
819 CanvasXYGridSnapper::CanvasXYGridSnapper(CanvasXYGrid *grid, SPNamedView const *nv, NR::Coord const d) : LineSnapper(nv, d)
820 {
821 this->grid = grid;
822 }
824 LineSnapper::LineList
825 CanvasXYGridSnapper::_getSnapLines(NR::Point const &p) const
826 {
827 LineList s;
829 if ( grid == NULL ) {
830 return s;
831 }
833 for (unsigned int i = 0; i < 2; ++i) {
835 /* This is to make sure we snap to only visible grid lines */
836 double scaled_spacing = grid->sw[i]; // this is spacing of visible lines if screen pixels
838 // convert screen pixels to px
839 // FIXME: after we switch to snapping dist in screen pixels, this will be unnecessary
840 if (SP_ACTIVE_DESKTOP) {
841 scaled_spacing /= SP_ACTIVE_DESKTOP->current_zoom();
842 }
844 NR::Coord const rounded = round_to_nearest_multiple_plus(p[i],
845 scaled_spacing,
846 grid->origin[i]);
848 s.push_back(std::make_pair(NR::Dim2(i), rounded));
849 }
851 return s;
852 }
858 }; /* namespace Inkscape */
861 /*
862 Local Variables:
863 mode:c++
864 c-file-style:"stroustrup"
865 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
866 indent-tabs-mode:nil
867 fill-column:99
868 End:
869 */
870 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :