1 #define CANVAS_AXONOMGRID_C
3 /*
4 * Copyright (C) 2006-2007 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 * When I quickly think about it: all possibilities are probably covered this way. Eg.
13 * a z-axis with negative angle can be replaced with an x-axis, etc.
14 */
16 /*
17 * TODO: LOTS LOTS LOTS. Clean up code. dirty as hell
18 * THIS FILE AND THE HEADER FILE NEED HUGE CLEANING UP. PLEASE DO NOT HESISTATE TO DO SO.
19 * For example: the line drawing code should not be here. There _must_ be a function somewhere else that can provide this functionality...
20 */
22 #include "sp-canvas-util.h"
23 #include "canvas-axonomgrid.h"
24 #include "util/mathfns.h"
25 #include "display-forward.h"
26 #include <libnr/nr-pixops.h>
29 #include "canvas-grid.h"
30 #include "desktop-handles.h"
31 #include "helper/units.h"
32 #include "svg/svg-color.h"
33 #include "xml/node-event-vector.h"
34 #include "sp-object.h"
36 #include "sp-namedview.h"
37 #include "inkscape.h"
38 #include "desktop.h"
40 #include "document.h"
42 #define SAFE_SETPIXEL //undefine this when it is certain that setpixel is never called with invalid params
44 #define DEFAULTGRIDCOLOR 0x0000FF20
45 #define DEFAULTGRIDEMPCOLOR 0x0000FF50
47 enum Dim3 { X=0, Y, Z };
49 #ifndef M_PI
50 # define M_PI 3.14159265358979323846
51 #endif
53 static double deg_to_rad(double deg) { return deg*M_PI/180.0;}
56 /**
57 \brief This function renders a pixel on a particular buffer.
59 The topleft of the buffer equals
60 ( rect.x0 , rect.y0 ) in screen coordinates
61 ( 0 , 0 ) in setpixel coordinates
62 The bottomright of the buffer equals
63 ( rect.x1 , rect,y1 ) in screen coordinates
64 ( rect.x1 - rect.x0 , rect.y1 - rect.y0 ) in setpixel coordinates
65 */
66 static void
67 sp_caxonomgrid_setpixel (SPCanvasBuf *buf, gint x, gint y, guint32 rgba)
68 {
69 #ifdef SAFE_SETPIXEL
70 if ( (x >= buf->rect.x0) && (x < buf->rect.x1) && (y >= buf->rect.y0) && (y < buf->rect.y1) ) {
71 #endif
72 guint r, g, b, a;
73 r = NR_RGBA32_R (rgba);
74 g = NR_RGBA32_G (rgba);
75 b = NR_RGBA32_B (rgba);
76 a = NR_RGBA32_A (rgba);
77 guchar * p = buf->buf + (y - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;
78 p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
79 p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
80 p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
81 #ifdef SAFE_SETPIXEL
82 }
83 #endif
84 }
86 /**
87 \brief This function renders a line on a particular canvas buffer,
88 using Bresenham's line drawing function.
89 http://www.cs.unc.edu/~mcmillan/comp136/Lecture6/Lines.html
90 Coordinates are interpreted as SCREENcoordinates
91 */
92 static void
93 sp_caxonomgrid_drawline (SPCanvasBuf *buf, gint x0, gint y0, gint x1, gint y1, guint32 rgba)
94 {
95 int dy = y1 - y0;
96 int dx = x1 - x0;
97 int stepx, stepy;
99 if (dy < 0) { dy = -dy; stepy = -1; } else { stepy = 1; }
100 if (dx < 0) { dx = -dx; stepx = -1; } else { stepx = 1; }
101 dy <<= 1; // dy is now 2*dy
102 dx <<= 1; // dx is now 2*dx
104 sp_caxonomgrid_setpixel(buf, x0, y0, rgba);
105 if (dx > dy) {
106 int fraction = dy - (dx >> 1); // same as 2*dy - dx
107 while (x0 != x1) {
108 if (fraction >= 0) {
109 y0 += stepy;
110 fraction -= dx; // same as fraction -= 2*dx
111 }
112 x0 += stepx;
113 fraction += dy; // same as fraction -= 2*dy
114 sp_caxonomgrid_setpixel(buf, x0, y0, rgba);
115 }
116 } else {
117 int fraction = dx - (dy >> 1);
118 while (y0 != y1) {
119 if (fraction >= 0) {
120 x0 += stepx;
121 fraction -= dy;
122 }
123 y0 += stepy;
124 fraction += dx;
125 sp_caxonomgrid_setpixel(buf, x0, y0, rgba);
126 }
127 }
129 }
131 static void
132 sp_grid_vline (SPCanvasBuf *buf, gint x, gint ys, gint ye, guint32 rgba)
133 {
134 if ((x >= buf->rect.x0) && (x < buf->rect.x1)) {
135 guint r, g, b, a;
136 gint y0, y1, y;
137 guchar *p;
138 r = NR_RGBA32_R(rgba);
139 g = NR_RGBA32_G (rgba);
140 b = NR_RGBA32_B (rgba);
141 a = NR_RGBA32_A (rgba);
142 y0 = MAX (buf->rect.y0, ys);
143 y1 = MIN (buf->rect.y1, ye + 1);
144 p = buf->buf + (y0 - buf->rect.y0) * buf->buf_rowstride + (x - buf->rect.x0) * 3;
145 for (y = y0; y < y1; y++) {
146 p[0] = NR_COMPOSEN11_1111 (r, a, p[0]);
147 p[1] = NR_COMPOSEN11_1111 (g, a, p[1]);
148 p[2] = NR_COMPOSEN11_1111 (b, a, p[2]);
149 p += buf->buf_rowstride;
150 }
151 }
152 }
154 namespace Inkscape {
157 /**
158 * A DIRECT COPY-PASTE FROM DOCUMENT-PROPERTIES.CPP TO QUICKLY GET RESULTS
159 *
160 * Helper function that attachs widgets in a 3xn table. The widgets come in an
161 * array that has two entries per table row. The two entries code for four
162 * possible cases: (0,0) means insert space in first column; (0, non-0) means
163 * widget in columns 2-3; (non-0, 0) means label in columns 1-3; and
164 * (non-0, non-0) means two widgets in columns 2 and 3.
165 **/
166 #define SPACE_SIZE_X 15
167 #define SPACE_SIZE_Y 10
168 static inline void
169 attach_all(Gtk::Table &table, Gtk::Widget const *const arr[], unsigned size, int start = 0)
170 {
171 for (unsigned i=0, r=start; i<size/sizeof(Gtk::Widget*); i+=2) {
172 if (arr[i] && arr[i+1]) {
173 table.attach (const_cast<Gtk::Widget&>(*arr[i]), 1, 2, r, r+1,
174 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
175 table.attach (const_cast<Gtk::Widget&>(*arr[i+1]), 2, 3, r, r+1,
176 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
177 } else {
178 if (arr[i+1]) {
179 table.attach (const_cast<Gtk::Widget&>(*arr[i+1]), 1, 3, r, r+1,
180 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
181 } else if (arr[i]) {
182 Gtk::Label& label = reinterpret_cast<Gtk::Label&> (const_cast<Gtk::Widget&>(*arr[i]));
183 label.set_alignment (0.0);
184 table.attach (label, 0, 3, r, r+1,
185 Gtk::FILL|Gtk::EXPAND, (Gtk::AttachOptions)0,0,0);
186 } else {
187 Gtk::HBox *space = manage (new Gtk::HBox);
188 space->set_size_request (SPACE_SIZE_X, SPACE_SIZE_Y);
189 table.attach (*space, 0, 1, r, r+1,
190 (Gtk::AttachOptions)0, (Gtk::AttachOptions)0,0,0);
191 }
192 }
193 ++r;
194 }
195 }
197 CanvasAxonomGrid::CanvasAxonomGrid (SPNamedView * nv, Inkscape::XML::Node * in_repr, SPDocument * in_doc)
198 : CanvasGrid(nv, in_repr, in_doc, GRID_AXONOMETRIC), table(1, 1)
199 {
200 origin[NR::X] = origin[NR::Y] = 0.0;
201 color = DEFAULTGRIDCOLOR;
202 empcolor = DEFAULTGRIDEMPCOLOR;
203 empspacing = 5;
204 gridunit = &sp_unit_get_by_id(SP_UNIT_MM);
205 angle_deg[X] = angle_deg[Z] = 30;
206 angle_deg[Y] =0;
207 lengthy = sp_units_get_pixels(1.0, *(gridunit));
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);
216 // initialize widgets:
217 vbox.set_border_width(2);
218 table.set_spacings(2);
219 vbox.pack_start(table, false, false, 0);
221 _rumg.init (_("Grid _units:"), "units", _wr, repr, doc);
222 _rsu_ox.init (_("_Origin X:"), _("X coordinate of grid origin"),
223 "originx", _rumg, _wr, repr, doc);
224 _rsu_oy.init (_("O_rigin Y:"), _("Y coordinate of grid origin"),
225 "originy", _rumg, _wr, repr, doc);
226 _rsu_sy.init (_("Spacing _Y:"), _("Base length of z-axis"),
227 "spacingy", _rumg, _wr, repr, doc);
228 _rsu_ax.init (_("Angle X:"), _("Angle of x-axis"),
229 "gridanglex", _rumg, _wr, repr, doc);
230 _rsu_az.init (_("Angle Z:"), _("Angle of z-axis"),
231 "gridanglez", _rumg, _wr, repr, doc);
232 _rcp_gcol.init (_("Grid line _color:"), _("Grid line color"),
233 _("Color of grid lines"), "color", "opacity", _wr, repr, doc);
234 _rcp_gmcol.init (_("Ma_jor grid line color:"), _("Major grid line color"),
235 _("Color of the major (highlighted) grid lines"),
236 "empcolor", "empopacity", _wr, repr, doc);
237 _rsi.init (_("_Major grid line every:"), _("lines"), "empspacing", _wr, repr, doc);
239 Gtk::Widget const *const widget_array[] = {
240 0, _rcbgrid._button,
241 _rumg._label, _rumg._sel,
242 0, _rsu_ox.getSU(),
243 0, _rsu_oy.getSU(),
244 0, _rsu_sy.getSU(),
245 0, _rsu_ax.getSU(),
246 0, _rsu_az.getSU(),
247 _rcp_gcol._label, _rcp_gcol._cp,
248 0, 0,
249 _rcp_gmcol._label, _rcp_gmcol._cp,
250 _rsi._label, &_rsi._hbox,
251 };
253 attach_all (table, widget_array, sizeof(widget_array));
255 vbox.show();
257 if (repr) readRepr();
258 updateWidgets();
259 }
261 CanvasAxonomGrid::~CanvasAxonomGrid ()
262 {
263 if (snapper) delete snapper;
264 }
267 /* fixme: Collect all these length parsing methods and think common sane API */
269 static gboolean sp_nv_read_length(gchar const *str, guint base, gdouble *val, SPUnit const **unit)
270 {
271 if (!str) {
272 return FALSE;
273 }
275 gchar *u;
276 gdouble v = g_ascii_strtod(str, &u);
277 if (!u) {
278 return FALSE;
279 }
280 while (isspace(*u)) {
281 u += 1;
282 }
284 if (!*u) {
285 /* No unit specified - keep default */
286 *val = v;
287 return TRUE;
288 }
290 if (base & SP_UNIT_DEVICE) {
291 if (u[0] && u[1] && !isalnum(u[2]) && !strncmp(u, "px", 2)) {
292 *unit = &sp_unit_get_by_id(SP_UNIT_PX);
293 *val = v;
294 return TRUE;
295 }
296 }
298 if (base & SP_UNIT_ABSOLUTE) {
299 if (!strncmp(u, "pt", 2)) {
300 *unit = &sp_unit_get_by_id(SP_UNIT_PT);
301 } else if (!strncmp(u, "mm", 2)) {
302 *unit = &sp_unit_get_by_id(SP_UNIT_MM);
303 } else if (!strncmp(u, "cm", 2)) {
304 *unit = &sp_unit_get_by_id(SP_UNIT_CM);
305 } else if (!strncmp(u, "m", 1)) {
306 *unit = &sp_unit_get_by_id(SP_UNIT_M);
307 } else if (!strncmp(u, "in", 2)) {
308 *unit = &sp_unit_get_by_id(SP_UNIT_IN);
309 } else {
310 return FALSE;
311 }
312 *val = v;
313 return TRUE;
314 }
316 return FALSE;
317 }
319 static gboolean sp_nv_read_opacity(gchar const *str, guint32 *color)
320 {
321 if (!str) {
322 return FALSE;
323 }
325 gchar *u;
326 gdouble v = g_ascii_strtod(str, &u);
327 if (!u) {
328 return FALSE;
329 }
330 v = CLAMP(v, 0.0, 1.0);
332 *color = (*color & 0xffffff00) | (guint32) floor(v * 255.9999);
334 return TRUE;
335 }
339 void
340 CanvasAxonomGrid::readRepr()
341 {
342 gchar const *value;
343 if ( (value = repr->attribute("originx")) ) {
344 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &origin[NR::X], &gridunit);
345 origin[NR::X] = sp_units_get_pixels(origin[NR::X], *(gridunit));
346 }
347 if ( (value = repr->attribute("originy")) ) {
348 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &origin[NR::Y], &gridunit);
349 origin[NR::Y] = sp_units_get_pixels(origin[NR::Y], *(gridunit));
350 }
352 if ( (value = repr->attribute("spacingy")) ) {
353 sp_nv_read_length(value, SP_UNIT_ABSOLUTE | SP_UNIT_DEVICE, &lengthy, &gridunit);
354 lengthy = sp_units_get_pixels(lengthy, *(gridunit));
355 if (lengthy < 1.0) lengthy = 1.0;
356 }
358 if ( (value = repr->attribute("gridanglex")) ) {
359 angle_deg[X] = g_ascii_strtod(value, NULL);
360 if (angle_deg[X] < 1.0) angle_deg[X] = 1.0;
361 if (angle_deg[X] > 89.0) angle_deg[X] = 89.0;
362 angle_rad[X] = deg_to_rad(angle_deg[X]);
363 tan_angle[X] = tan(angle_rad[X]);
364 }
366 if ( (value = repr->attribute("gridanglez")) ) {
367 angle_deg[Z] = g_ascii_strtod(value, NULL);
368 if (angle_deg[Z] < 1.0) angle_deg[Z] = 1.0;
369 if (angle_deg[Z] > 89.0) angle_deg[Z] = 89.0;
370 angle_rad[Z] = deg_to_rad(angle_deg[Z]);
371 tan_angle[Z] = tan(angle_rad[Z]);
372 }
374 if ( (value = repr->attribute("color")) ) {
375 color = (color & 0xff) | sp_svg_read_color(value, color);
376 }
378 if ( (value = repr->attribute("empcolor")) ) {
379 empcolor = (empcolor & 0xff) | sp_svg_read_color(value, empcolor);
380 }
382 if ( (value = repr->attribute("opacity")) ) {
383 sp_nv_read_opacity(value, &color);
384 }
385 if ( (value = repr->attribute("empopacity")) ) {
386 sp_nv_read_opacity(value, &empcolor);
387 }
389 if ( (value = repr->attribute("empspacing")) ) {
390 empspacing = atoi(value);
391 }
393 if ( (value = repr->attribute("visible")) ) {
394 visible = (strcmp(value,"true") == 0);
395 }
397 if ( (value = repr->attribute("snap_enabled")) ) {
398 snap_enabled = (strcmp(value,"true") == 0);
399 }
401 for (GSList *l = canvasitems; l != NULL; l = l->next) {
402 sp_canvas_item_request_update ( SP_CANVAS_ITEM(l->data) );
403 }
404 return;
405 }
407 /**
408 * Called when XML node attribute changed; updates dialog widgets if change was not done by widgets themselves.
409 */
410 void
411 CanvasAxonomGrid::onReprAttrChanged(Inkscape::XML::Node */*repr*/, gchar const */*key*/, gchar const */*oldval*/, gchar const */*newval*/, bool /*is_interactive*/)
412 {
413 readRepr();
415 if ( ! (_wr.isUpdating()) )
416 updateWidgets();
417 }
422 Gtk::Widget &
423 CanvasAxonomGrid::getWidget()
424 {
425 return vbox;
426 }
429 /**
430 * Update dialog widgets from object's values.
431 */
432 void
433 CanvasAxonomGrid::updateWidgets()
434 {
435 if (_wr.isUpdating()) return;
437 _wr.setUpdating (true);
439 _rcb_visible.setActive(visible);
440 _rcb_snap_enabled.setActive(snap_enabled);
442 _rumg.setUnit (gridunit);
444 gdouble val;
445 val = origin[NR::X];
446 val = sp_pixels_get_units (val, *(gridunit));
447 _rsu_ox.setValue (val);
448 val = origin[NR::Y];
449 val = sp_pixels_get_units (val, *(gridunit));
450 _rsu_oy.setValue (val);
451 val = lengthy;
452 double gridy = sp_pixels_get_units (val, *(gridunit));
453 _rsu_sy.setValue (gridy);
455 _rsu_ax.setValue(angle_deg[X]);
456 _rsu_az.setValue(angle_deg[Z]);
458 _rcp_gcol.setRgba32 (color);
459 _rcp_gmcol.setRgba32 (empcolor);
460 _rsi.setValue (empspacing);
462 _wr.setUpdating (false);
464 return;
465 }
469 void
470 CanvasAxonomGrid::Update (NR::Matrix const &affine, unsigned int /*flags*/)
471 {
472 ow = origin * affine;
473 sw = NR::Point(fabs(affine[0]),fabs(affine[3]));
475 for(int dim = 0; dim < 2; dim++) {
476 gint scaling_factor = empspacing;
478 if (scaling_factor <= 1)
479 scaling_factor = 5;
481 scaled = FALSE;
482 int watchdog = 0;
483 while ( (sw[dim] < 8.0) & (watchdog < 100) ) {
484 scaled = TRUE;
485 sw[dim] *= scaling_factor;
486 // First pass, go up to the major line spacing, then
487 // keep increasing by two.
488 scaling_factor = 2;
489 watchdog++;
490 }
492 }
494 spacing_ylines = sw[NR::X] * lengthy /(tan_angle[X] + tan_angle[Z]);
495 lyw = sw[NR::Y] * lengthy;
496 lxw_x = (lengthy / tan_angle[X]) * sw[NR::X];
497 lxw_z = (lengthy / tan_angle[Z]) * sw[NR::X];
499 if (empspacing == 0) {
500 scaled = TRUE;
501 }
503 }
505 void
506 CanvasAxonomGrid::Render (SPCanvasBuf *buf)
507 {
508 // gc = gridcoordinates (the coordinates calculated from the grids origin 'grid->ow'.
509 // sc = screencoordinates ( for example "buf->rect.x0" is in screencoordinates )
510 // bc = buffer patch coordinates
512 // tl = topleft ; br = bottomright
513 NR::Point buf_tl_gc;
514 NR::Point buf_br_gc;
515 buf_tl_gc[NR::X] = buf->rect.x0 - ow[NR::X];
516 buf_tl_gc[NR::Y] = buf->rect.y0 - ow[NR::Y];
517 buf_br_gc[NR::X] = buf->rect.x1 - ow[NR::X];
518 buf_br_gc[NR::Y] = buf->rect.y1 - ow[NR::Y];
520 gdouble x;
521 gdouble y;
523 // render the three separate line groups representing the main-axes
525 // x-axis always goes from topleft to bottomright. (0,0) - (1,1)
526 gdouble const xintercept_y_bc = (buf_tl_gc[NR::X] * tan_angle[X]) - buf_tl_gc[NR::Y] ;
527 gdouble const xstart_y_sc = ( xintercept_y_bc - floor(xintercept_y_bc/lyw)*lyw ) + buf->rect.y0;
528 gint const xlinestart = (gint) Inkscape::round( (xstart_y_sc - buf->rect.x0*tan_angle[X] -ow[NR::Y]) / lyw );
529 gint xlinenum = xlinestart;
530 // lines starting on left side.
531 for (y = xstart_y_sc; y < buf->rect.y1; y += lyw, xlinenum++) {
532 gint const x0 = buf->rect.x0;
533 gint const y0 = (gint) Inkscape::round(y);
534 gint const x1 = x0 + (gint) Inkscape::round( (buf->rect.y1 - y) / tan_angle[X] );
535 gint const y1 = buf->rect.y1;
537 if (!scaled && (xlinenum % empspacing) == 0) {
538 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, empcolor);
539 } else {
540 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, color);
541 }
542 }
543 // lines starting from top side
544 gdouble const xstart_x_sc = buf->rect.x0 + (lxw_x - (xstart_y_sc - buf->rect.y0) / tan_angle[X]) ;
545 xlinenum = xlinestart-1;
546 for (x = xstart_x_sc; x < buf->rect.x1; x += lxw_x, xlinenum--) {
547 gint const y0 = buf->rect.y0;
548 gint const y1 = buf->rect.y1;
549 gint const x0 = (gint) Inkscape::round(x);
550 gint const x1 = x0 + (gint) Inkscape::round( (y1 - y0) / tan_angle[X] );
552 if (!scaled && (xlinenum % empspacing) == 0) {
553 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, empcolor);
554 } else {
555 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, color);
556 }
557 }
559 // y-axis lines (vertical)
560 gdouble const ystart_x_sc = floor (buf_tl_gc[NR::X] / spacing_ylines) * spacing_ylines + ow[NR::X];
561 gint const ylinestart = (gint) Inkscape::round((ystart_x_sc - ow[NR::X]) / spacing_ylines);
562 gint ylinenum = ylinestart;
563 for (x = ystart_x_sc; x < buf->rect.x1; x += spacing_ylines, ylinenum++) {
564 gint const x0 = (gint) Inkscape::round(x);
566 if (!scaled && (ylinenum % empspacing) == 0) {
567 sp_grid_vline (buf, x0, buf->rect.y0, buf->rect.y1 - 1, empcolor);
568 } else {
569 sp_grid_vline (buf, x0, buf->rect.y0, buf->rect.y1 - 1, color);
570 }
571 }
573 // z-axis always goes from bottomleft to topright. (0,1) - (1,0)
574 gdouble const zintercept_y_bc = (buf_tl_gc[NR::X] * -tan_angle[Z]) - buf_tl_gc[NR::Y] ;
575 gdouble const zstart_y_sc = ( zintercept_y_bc - floor(zintercept_y_bc/lyw)*lyw ) + buf->rect.y0;
576 gint const zlinestart = (gint) Inkscape::round( (zstart_y_sc + buf->rect.x0*tan_angle[X] - ow[NR::Y]) / lyw );
577 gint zlinenum = zlinestart;
578 // lines starting from left side
579 for (y = zstart_y_sc; y < buf->rect.y1; y += lyw, zlinenum++) {
580 gint const x0 = buf->rect.x0;
581 gint const y0 = (gint) Inkscape::round(y);
582 gint const x1 = x0 + (gint) Inkscape::round( (y - buf->rect.y0 ) / tan_angle[Z] );
583 gint const y1 = buf->rect.y0;
585 if (!scaled && (zlinenum % empspacing) == 0) {
586 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, empcolor);
587 } else {
588 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, color);
589 }
590 }
591 // draw lines from bottom-up
592 gdouble const zstart_x_sc = buf->rect.x0 + (y - buf->rect.y1) / tan_angle[Z] ;
593 for (x = zstart_x_sc; x < buf->rect.x1; x += lxw_z, zlinenum++) {
594 gint const y0 = buf->rect.y1;
595 gint const y1 = buf->rect.y0;
596 gint const x0 = (gint) Inkscape::round(x);
597 gint const x1 = x0 + (gint) Inkscape::round( (buf->rect.y1 - buf->rect.y0) / tan_angle[Z] );
599 if (!scaled && (zlinenum % empspacing) == 0) {
600 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, empcolor);
601 } else {
602 sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, color);
603 }
604 }
605 }
607 CanvasAxonomGridSnapper::CanvasAxonomGridSnapper(CanvasAxonomGrid *grid, SPNamedView const *nv, NR::Coord const d) : LineSnapper(nv, d)
608 {
609 this->grid = grid;
610 }
612 LineSnapper::LineList
613 CanvasAxonomGridSnapper::_getSnapLines(NR::Point const &p) const
614 {
615 LineList s;
617 if ( grid == NULL ) {
618 return s;
619 }
621 /* This is to make sure we snap to only visible grid lines */
622 double scaled_spacing = grid->spacing_ylines; // this is spacing of visible lines if screen pixels
624 // convert screen pixels to px
625 // FIXME: after we switch to snapping dist in screen pixels, this will be unnecessary
626 if (SP_ACTIVE_DESKTOP) {
627 scaled_spacing /= SP_ACTIVE_DESKTOP->current_zoom();
628 }
630 NR::Coord const rounded = Inkscape::Util::round_to_nearest_multiple_plus(p[0],
631 scaled_spacing,
632 grid->origin[0]);
634 s.push_back(std::make_pair(NR::Dim2(0), rounded));
636 return s;
637 }
639 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
640 {
641 SnappedLine dummy = SnappedLine(snapped_point, snapped_distance, normal_to_line, point_on_line);
642 sc.grid_lines.push_back(dummy);
643 }
647 }; // namespace Inkscape
650 /*
651 Local Variables:
652 mode:c++
653 c-file-style:"stroustrup"
654 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
655 indent-tabs-mode:nil
656 fill-column:99
657 End:
658 */
659 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :