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 const gchar *grid_name [] = {
35 N_("Rectangular grid"),
36 N_("Axonometric grid")
37 };
38 const gchar *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 const char *
180 CanvasGrid::getName(GridType type)
181 {
182 return _(grid_name[type]);
183 }
185 const char *
186 CanvasGrid::getSVGName(GridType type)
187 {
188 return grid_svgname[type];
189 }
191 GridType
192 CanvasGrid::getGridTypeFromSVGName(const char * 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(const char * 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, but share the same CanvasGrid object; that is what this function is for.
270 // check if there is already a canvasitem on this desktop linking to this grid
271 for (GSList *l = canvasitems; l != NULL; l = l->next) {
272 if ( sp_desktop_gridgroup(desktop) == SP_CANVAS_GROUP(SP_CANVAS_ITEM(l->data)->parent) ) {
273 return NULL;
274 }
275 }
277 GridCanvasItem * item = INKSCAPE_GRID_CANVASITEM( sp_canvas_item_new(sp_desktop_gridgroup(desktop), INKSCAPE_TYPE_GRID_CANVASITEM, NULL) );
278 item->grid = this;
279 sp_canvas_item_show(SP_CANVAS_ITEM(item));
281 gtk_object_ref(GTK_OBJECT(item)); // since we're keeping a link to this item, we need to bump up the ref count
282 canvasitems = g_slist_prepend(canvasitems, item);
284 return item;
285 }
287 void
288 CanvasGrid::on_repr_attr_changed (Inkscape::XML::Node * repr, const gchar *key, const gchar *oldval, const gchar *newval, bool is_interactive, void * data)
289 {
290 if (!data)
291 return;
293 ((CanvasGrid*) data)->onReprAttrChanged(repr, key, oldval, newval, is_interactive);
294 }
298 // ##########################################################
299 // CanvasXYGrid
302 /**
303 * "attach_all" function
304 * A DIRECT COPY-PASTE FROM DOCUMENT-PROPERTIES.CPP TO QUICKLY GET RESULTS
305 *
306 * Helper function that attachs widgets in a 3xn table. The widgets come in an
307 * array that has two entries per table row. The two entries code for four
308 * possible cases: (0,0) means insert space in first column; (0, non-0) means
309 * widget in columns 2-3; (non-0, 0) means label in columns 1-3; and
310 * (non-0, non-0) means two widgets in columns 2 and 3.
311 **/
312 #define SPACE_SIZE_X 15
313 #define SPACE_SIZE_Y 10
314 static inline void
315 attach_all (Gtk::Table &table, const Gtk::Widget *arr[], unsigned size, int start = 0)
316 {
317 for (unsigned i=0, r=start; i<size/sizeof(Gtk::Widget*); i+=2)
318 {
319 if (arr[i] && arr[i+1])
320 {
321 table.attach (const_cast<Gtk::Widget&>(*arr[i]), 1, 2, r, r+1,
322 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
323 table.attach (const_cast<Gtk::Widget&>(*arr[i+1]), 2, 3, r, r+1,
324 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
325 }
326 else
327 {
328 if (arr[i+1])
329 table.attach (const_cast<Gtk::Widget&>(*arr[i+1]), 1, 3, r, r+1,
330 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
331 else if (arr[i])
332 {
333 Gtk::Label& label = reinterpret_cast<Gtk::Label&> (const_cast<Gtk::Widget&>(*arr[i]));
334 label.set_alignment (0.0);
335 table.attach (label, 0, 3, r, r+1,
336 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
337 }
338 else
339 {
340 Gtk::HBox *space = manage (new Gtk::HBox);
341 space->set_size_request (SPACE_SIZE_X, SPACE_SIZE_Y);
342 table.attach (*space, 0, 1, r, r+1,
343 (Gtk::AttachOptions)0, (Gtk::AttachOptions)0,0,0);
344 }
345 }
346 ++r;
347 }
348 }
350 CanvasXYGrid::CanvasXYGrid (SPNamedView * nv, Inkscape::XML::Node * in_repr, SPDocument * in_doc)
351 : CanvasGrid(nv, in_repr, in_doc), table(1, 1)
352 {
353 origin[NR::X] = origin[NR::Y] = 0.0;
354 color = DEFAULTGRIDCOLOR;
355 empcolor = DEFAULTGRIDEMPCOLOR;
356 empspacing = 5;
357 spacing[NR::X] = spacing[NR::Y] = 1.0;
358 gridunit = &sp_unit_get_by_id(SP_UNIT_PX);
359 render_dotted = false;
361 snapper = new CanvasXYGridSnapper(this, namedview, 0);
363 // initialize widgets:
364 vbox.set_border_width(2);
365 table.set_spacings(2);
366 vbox.pack_start(table, false, false, 0);
368 _rumg.init (_("Grid _units:"), "units", _wr, repr, doc);
369 _rsu_ox.init (_("_Origin X:"), _("X coordinate of grid origin"),
370 "originx", _rumg, _wr, repr, doc);
371 _rsu_oy.init (_("O_rigin Y:"), _("Y coordinate of grid origin"),
372 "originy", _rumg, _wr, repr, doc);
373 _rsu_sx.init (_("Spacing _X:"), _("Distance between vertical grid lines"),
374 "spacingx", _rumg, _wr, repr, doc);
375 _rsu_sy.init (_("Spacing _Y:"), _("Distance between horizontal grid lines"),
376 "spacingy", _rumg, _wr, repr, doc);
377 _rcp_gcol.init (_("Grid line _color:"), _("Grid line color"),
378 _("Color of grid lines"), "color", "opacity", _wr, repr, doc);
379 _rcp_gmcol.init (_("Ma_jor grid line color:"), _("Major grid line color"),
380 _("Color of the major (highlighted) grid lines"),
381 "empcolor", "empopacity", _wr, repr, doc);
382 _rsi.init (_("_Major grid line every:"), _("lines"), "empspacing", _wr, repr, doc);
383 _rcb_dotted.init ( _("_Show dots instead of lines"),
384 _("If set, displays dots at gridpoints instead of gridlines"),
385 "dotted", _wr, false, repr, doc);
387 const Gtk::Widget* widget_array[] =
388 {
389 _rumg._label, _rumg._sel,
390 0, _rsu_ox.getSU(),
391 0, _rsu_oy.getSU(),
392 0, _rsu_sx.getSU(),
393 0, _rsu_sy.getSU(),
394 _rcp_gcol._label, _rcp_gcol._cp,
395 0, 0,
396 _rcp_gmcol._label, _rcp_gmcol._cp,
397 _rsi._label, &_rsi._hbox,
398 0, _rcb_dotted._button,
399 };
401 attach_all (table, widget_array, sizeof(widget_array));
403 vbox.show();
405 if (repr) readRepr();
406 updateWidgets();
407 }
409 CanvasXYGrid::~CanvasXYGrid ()
410 {
411 if (snapper) delete snapper;
412 }
415 /* fixme: Collect all these length parsing methods and think common sane API */
417 static gboolean sp_nv_read_length(const gchar *str, guint base, gdouble *val, const SPUnit **unit)
418 {
419 if (!str) {
420 return FALSE;
421 }
423 gchar *u;
424 gdouble v = g_ascii_strtod(str, &u);
425 if (!u) {
426 return FALSE;
427 }
428 while (isspace(*u)) {
429 u += 1;
430 }
432 if (!*u) {
433 /* No unit specified - keep default */
434 *val = v;
435 return TRUE;
436 }
438 if (base & SP_UNIT_DEVICE) {
439 if (u[0] && u[1] && !isalnum(u[2]) && !strncmp(u, "px", 2)) {
440 *unit = &sp_unit_get_by_id(SP_UNIT_PX);
441 *val = v;
442 return TRUE;
443 }
444 }
446 if (base & SP_UNIT_ABSOLUTE) {
447 if (!strncmp(u, "pt", 2)) {
448 *unit = &sp_unit_get_by_id(SP_UNIT_PT);
449 } else if (!strncmp(u, "mm", 2)) {
450 *unit = &sp_unit_get_by_id(SP_UNIT_MM);
451 } else if (!strncmp(u, "cm", 2)) {
452 *unit = &sp_unit_get_by_id(SP_UNIT_CM);
453 } else if (!strncmp(u, "m", 1)) {
454 *unit = &sp_unit_get_by_id(SP_UNIT_M);
455 } else if (!strncmp(u, "in", 2)) {
456 *unit = &sp_unit_get_by_id(SP_UNIT_IN);
457 } else {
458 return FALSE;
459 }
460 *val = v;
461 return TRUE;
462 }
464 return FALSE;
465 }
467 static gboolean sp_nv_read_opacity(const gchar *str, guint32 *color)
468 {
469 if (!str) {
470 return FALSE;
471 }
473 gchar *u;
474 gdouble v = g_ascii_strtod(str, &u);
475 if (!u) {
476 return FALSE;
477 }
478 v = CLAMP(v, 0.0, 1.0);
480 *color = (*color & 0xffffff00) | (guint32) floor(v * 255.9999);
482 return TRUE;
483 }
485 /** If the passed scalar is invalid (<=0), then set the widget and the scalar
486 to use the given old value.
487 @param oldVal old value to use if the new one is invalid
488 @param pTarget the scalar to validate
489 @param widget widget associated with the scalar
490 */
491 static void validateScalar(double oldVal,
492 double* pTarget,
493 Inkscape::UI::Widget::RegisteredScalarUnit& widget)
494 {
495 // Avoid nullness.
496 if ( pTarget == NULL )
497 return;
499 // Invalid new value?
500 if ( *pTarget <= 0 )
501 {
502 // If the old value is somehow invalid as well, then default to 1.
503 if ( oldVal <= 0 )
504 oldVal = 1;
506 // Reset the scalar and associated widget to the old value.
507 *pTarget = oldVal;
508 widget.setValue( *pTarget);
509 } //if
511 } //validateScalar
514 /** If the passed int is invalid (<=0), then set the widget and the int
515 to use the given old value.
516 @param oldVal old value to use if the new one is invalid
517 @param pTarget the int to validate
518 @param widget widget associated with the int
519 */
520 static void validateInt(gint oldVal,
521 gint* pTarget,
522 Inkscape::UI::Widget::RegisteredSuffixedInteger& widget)
523 {
524 // Avoid nullness.
525 if ( pTarget == NULL )
526 return;
528 // Invalid new value?
529 if ( *pTarget <= 0 )
530 {
531 // If the old value is somehow invalid as well, then default to 1.
532 if ( oldVal <= 0 )
533 oldVal = 1;
535 // Reset the int and associated widget to the old value.
536 *pTarget = oldVal;
537 widget.setValue( *pTarget);
538 } //if
540 } //validateInt
542 void
543 CanvasXYGrid::readRepr()
544 {
545 char buff[100];
546 gchar const* value;
547 if ( (value = repr->attribute("originx")) ) {
548 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &origin[NR::X], &gridunit);
549 origin[NR::X] = sp_units_get_pixels(origin[NR::X], *(gridunit));
551 }
552 if ( (value = repr->attribute("originy")) ) {
553 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &origin[NR::Y], &gridunit);
554 origin[NR::Y] = sp_units_get_pixels(origin[NR::Y], *(gridunit));
555 }
557 if ( (value = repr->attribute("spacingx")) ) {
558 double oldVal = spacing[NR::X];
559 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &spacing[NR::X], &gridunit);
560 validateScalar( oldVal, &spacing[NR::X], _rsu_sx );
561 spacing[NR::X] = sp_units_get_pixels(spacing[NR::X], *(gridunit));
563 }
564 if ( (value = repr->attribute("spacingy")) ) {
565 double oldVal = spacing[NR::Y];
566 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &spacing[NR::Y], &gridunit);
567 validateScalar( oldVal, &spacing[NR::Y], _rsu_sy );
568 spacing[NR::Y] = sp_units_get_pixels(spacing[NR::Y], *(gridunit));
570 }
572 if ( (value = repr->attribute("color")) ) {
573 color = (color & 0xff) | sp_svg_read_color(value, color);
574 }
576 if ( (value = repr->attribute("empcolor")) ) {
577 empcolor = (empcolor & 0xff) | sp_svg_read_color(value, empcolor);
578 }
580 if ( (value = repr->attribute("opacity")) ) {
581 sp_nv_read_opacity(value, &color);
582 }
583 if ( (value = repr->attribute("empopacity")) ) {
584 sp_nv_read_opacity(value, &empcolor);
585 }
587 if ( (value = repr->attribute("empspacing")) ) {
588 gint oldVal = empspacing;
589 empspacing = atoi(value);
590 validateInt( oldVal, &empspacing, _rsi );
591 }
593 if ( (value = repr->attribute("dotted")) ) {
594 render_dotted = (strcmp(value,"true") == 0);
595 }
597 for (GSList *l = canvasitems; l != NULL; l = l->next) {
598 sp_canvas_item_request_update ( SP_CANVAS_ITEM(l->data) );
599 }
601 return;
602 }
604 /**
605 * Called when XML node attribute changed; updates dialog widgets if change was not done by widgets themselves.
606 */
607 void
608 CanvasXYGrid::onReprAttrChanged (Inkscape::XML::Node * repr, const gchar *key, const gchar *oldval, const gchar *newval, bool is_interactive)
609 {
610 readRepr();
612 if ( ! (_wr.isUpdating()) )
613 updateWidgets();
614 }
619 Gtk::Widget &
620 CanvasXYGrid::getWidget()
621 {
622 return vbox;
623 }
626 /**
627 * Update dialog widgets from object's values.
628 */
629 void
630 CanvasXYGrid::updateWidgets()
631 {
632 if (_wr.isUpdating()) return;
634 _wr.setUpdating (true);
636 _rumg.setUnit (gridunit);
638 gdouble val;
639 val = origin[NR::X];
640 val = sp_pixels_get_units (val, *(gridunit));
641 _rsu_ox.setValue (val);
642 val = origin[NR::Y];
643 val = sp_pixels_get_units (val, *(gridunit));
644 _rsu_oy.setValue (val);
645 val = spacing[NR::X];
646 double gridx = sp_pixels_get_units (val, *(gridunit));
647 _rsu_sx.setValue (gridx);
648 val = spacing[NR::Y];
649 double gridy = sp_pixels_get_units (val, *(gridunit));
650 _rsu_sy.setValue (gridy);
652 _rcp_gcol.setRgba32 (color);
653 _rcp_gmcol.setRgba32 (empcolor);
654 _rsi.setValue (empspacing);
656 _wr.setUpdating (false);
658 return;
659 }
663 void
664 CanvasXYGrid::Update (NR::Matrix const &affine, unsigned int flags)
665 {
666 ow = origin * affine;
667 sw = spacing * affine;
668 sw -= NR::Point(affine[4], affine[5]);
670 for(int dim = 0; dim < 2; dim++) {
671 gint scaling_factor = empspacing;
673 if (scaling_factor <= 1)
674 scaling_factor = 5;
676 scaled[dim] = FALSE;
677 sw[dim] = fabs (sw[dim]);
678 while (sw[dim] < 8.0) {
679 scaled[dim] = TRUE;
680 sw[dim] *= scaling_factor;
681 /* First pass, go up to the major line spacing, then
682 keep increasing by two. */
683 scaling_factor = 2;
684 }
685 }
686 }
689 static void
690 grid_hline (SPCanvasBuf *buf, gint y, gint xs, gint xe, guint32 rgba)
691 {
692 if ((y >= buf->rect.y0) && (y < buf->rect.y1)) {
693 guint r, g, b, a;
694 gint x0, x1, x;
695 guchar *p;
696 r = NR_RGBA32_R (rgba);
697 g = NR_RGBA32_G (rgba);
698 b = NR_RGBA32_B (rgba);
699 a = NR_RGBA32_A (rgba);
700 x0 = MAX (buf->rect.x0, xs);
701 x1 = MIN (buf->rect.x1, xe + 1);
702 p = buf->buf + (y - buf->rect.y0) * buf->buf_rowstride + (x0 - buf->rect.x0) * 3;
703 for (x = x0; x < x1; x++) {
704 p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
705 p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
706 p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
707 p += 3;
708 }
709 }
710 }
712 static void
713 grid_vline (SPCanvasBuf *buf, gint x, gint ys, gint ye, guint32 rgba)
714 {
715 if ((x >= buf->rect.x0) && (x < buf->rect.x1)) {
716 guint r, g, b, a;
717 gint y0, y1, y;
718 guchar *p;
719 r = NR_RGBA32_R(rgba);
720 g = NR_RGBA32_G (rgba);
721 b = NR_RGBA32_B (rgba);
722 a = NR_RGBA32_A (rgba);
723 y0 = MAX (buf->rect.y0, ys);
724 y1 = MIN (buf->rect.y1, ye + 1);
725 p = buf->buf + (y0 - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;
726 for (y = y0; y < y1; y++) {
727 p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
728 p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
729 p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
730 p += buf->buf_rowstride;
731 }
732 }
733 }
735 static void
736 grid_dot (SPCanvasBuf *buf, gint x, gint y, guint32 rgba)
737 {
738 if ( (y >= buf->rect.y0) && (y < buf->rect.y1)
739 && (x >= buf->rect.x0) && (x < buf->rect.x1) ) {
740 guint r, g, b, a;
741 guchar *p;
742 r = NR_RGBA32_R (rgba);
743 g = NR_RGBA32_G (rgba);
744 b = NR_RGBA32_B (rgba);
745 a = NR_RGBA32_A (rgba);
746 p = buf->buf + (y - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;
747 p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
748 p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
749 p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
750 }
751 }
753 void
754 CanvasXYGrid::Render (SPCanvasBuf *buf)
755 {
756 const gdouble sxg = floor ((buf->rect.x0 - ow[NR::X]) / sw[NR::X]) * sw[NR::X] + ow[NR::X];
757 const gint xlinestart = (gint) Inkscape::round((sxg - ow[NR::X]) / sw[NR::X]);
758 const gdouble syg = floor ((buf->rect.y0 - ow[NR::Y]) / sw[NR::Y]) * sw[NR::Y] + ow[NR::Y];
759 const gint ylinestart = (gint) Inkscape::round((syg - ow[NR::Y]) / sw[NR::Y]);
761 if (!render_dotted) {
762 gint ylinenum;
763 gdouble y;
764 for (y = syg, ylinenum = ylinestart; y < buf->rect.y1; y += sw[NR::Y], ylinenum++) {
765 const gint y0 = (gint) Inkscape::round(y);
767 if (!scaled[NR::Y] && (ylinenum % empspacing) == 0) {
768 grid_hline (buf, y0, buf->rect.x0, buf->rect.x1 - 1, empcolor);
769 } else {
770 grid_hline (buf, y0, buf->rect.x0, buf->rect.x1 - 1, color);
771 }
772 }
774 gint xlinenum;
775 gdouble x;
776 for (x = sxg, xlinenum = xlinestart; x < buf->rect.x1; x += sw[NR::X], xlinenum++) {
777 const gint ix = (gint) Inkscape::round(x);
778 if (!scaled[NR::X] && (xlinenum % empspacing) == 0) {
779 grid_vline (buf, ix, buf->rect.y0, buf->rect.y1, empcolor);
780 } else {
781 grid_vline (buf, ix, buf->rect.y0, buf->rect.y1, color);
782 }
783 }
784 } else {
785 gint ylinenum;
786 gdouble y;
787 for (y = syg, ylinenum = ylinestart; y < buf->rect.y1; y += sw[NR::Y], ylinenum++) {
788 const gint iy = (gint) Inkscape::round(y);
790 gint xlinenum;
791 gdouble x;
792 for (x = sxg, xlinenum = xlinestart; x < buf->rect.x1; x += sw[NR::X], xlinenum++) {
793 const gint ix = (gint) Inkscape::round(x);
794 if ( (!scaled[NR::X] && (xlinenum % empspacing) == 0)
795 || (!scaled[NR::Y] && (ylinenum % empspacing) == 0) )
796 {
797 grid_dot (buf, ix, iy, empcolor | (guint32)0x000000FF); // put alpha to max value
798 }
799 else
800 {
801 grid_dot (buf, ix, iy, color | (guint32)0x000000FF); // put alpha to max value
802 }
803 }
805 }
806 }
807 }
812 /**
813 * \return x rounded to the nearest multiple of c1 plus c0.
814 *
815 * \note
816 * If c1==0 (and c0 is finite), then returns +/-inf. This makes grid spacing of zero
817 * mean "ignore the grid in this dimention". We're currently discussing "good" semantics
818 * for guide/grid snapping.
819 */
821 /* FIXME: move this somewhere else, perhaps */
822 static double round_to_nearest_multiple_plus(double x, double const c1, double const c0)
823 {
824 return floor((x - c0) / c1 + .5) * c1 + c0;
825 }
827 CanvasXYGridSnapper::CanvasXYGridSnapper(CanvasXYGrid *grid, SPNamedView const *nv, NR::Coord const d) : LineSnapper(nv, d)
828 {
829 this->grid = grid;
830 }
832 LineSnapper::LineList
833 CanvasXYGridSnapper::_getSnapLines(NR::Point const &p) const
834 {
835 LineList s;
837 if ( grid == NULL ) {
838 return s;
839 }
841 for (unsigned int i = 0; i < 2; ++i) {
843 /* This is to make sure we snap to only visible grid lines */
844 double scaled_spacing = grid->sw[i]; // this is spacing of visible lines if screen pixels
846 // convert screen pixels to px
847 // FIXME: after we switch to snapping dist in screen pixels, this will be unnecessary
848 if (SP_ACTIVE_DESKTOP) {
849 scaled_spacing /= SP_ACTIVE_DESKTOP->current_zoom();
850 }
852 NR::Coord const rounded = round_to_nearest_multiple_plus(p[i],
853 scaled_spacing,
854 grid->origin[i]);
856 s.push_back(std::make_pair(NR::Dim2(i), rounded));
857 }
859 return s;
860 }
866 }; /* namespace Inkscape */
868 /*
869 Local Variables:
870 mode:c++
871 c-file-style:"stroustrup"
872 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
873 indent-tabs-mode:nil
874 fill-column:99
875 End:
876 */
877 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :