ardour
canvas-simpleline.c
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1 #include <stdio.h>
2 #include <math.h>
3 #include <cairo.h>
4 #include <libgnomecanvas/libgnomecanvas.h>
5 
6 #include "canvas-simpleline.h"
7 #include "rgb_macros.h"
8 #include "gettext.h"
9 #define _(Text) dgettext (PACKAGE,Text)
10 
11 enum {
12  PROP_0,
13  PROP_X1,
14  PROP_Y1,
15  PROP_X2,
16  PROP_Y2,
17  PROP_COLOR_RGBA
18 };
19 
20 static void gnome_canvas_simpleline_class_init (GnomeCanvasSimpleLineClass *class);
21 
22 static void gnome_canvas_simpleline_init (GnomeCanvasSimpleLine *simpleline);
23 
24 static void gnome_canvas_simpleline_destroy (GtkObject *object);
25 
26 static void gnome_canvas_simpleline_set_property (GObject *object,
27  guint prop_id,
28  const GValue *value,
29  GParamSpec *pspec);
30 static void gnome_canvas_simpleline_get_property (GObject *object,
31  guint prop_id,
32  GValue *value,
33  GParamSpec *pspec);
34 
35 static void gnome_canvas_simpleline_update (GnomeCanvasItem *item,
36  double *affine,
37  ArtSVP *clip_path,
38  int flags);
39 
40 static void gnome_canvas_simpleline_bounds (GnomeCanvasItem *item,
41  double *x1,
42  double *y1,
43  double *x2,
44  double *y2);
45 
46 static double gnome_canvas_simpleline_point (GnomeCanvasItem *item,
47  double x,
48  double y,
49  int cx,
50  int cy,
51  GnomeCanvasItem **actual_item);
52 
53 static void gnome_canvas_simpleline_render (GnomeCanvasItem *item,
54  GnomeCanvasBuf *buf);
55 
56 static void gnome_canvas_simpleline_draw (GnomeCanvasItem *item,
57  GdkDrawable *drawable,
58  int x,
59  int y,
60  int w,
61  int h);
62 
63 static GnomeCanvasItemClass *parent_class;
64 
65 
66 GType
67 gnome_canvas_simpleline_get_type (void)
68 {
69  static GType simpleline_type;
70 
71  if (!simpleline_type) {
72  static const GTypeInfo object_info = {
73  sizeof (GnomeCanvasSimpleLineClass),
74  (GBaseInitFunc) NULL,
75  (GBaseFinalizeFunc) NULL,
76  (GClassInitFunc) gnome_canvas_simpleline_class_init,
77  (GClassFinalizeFunc) NULL,
78  NULL, /* class_data */
79  sizeof (GnomeCanvasSimpleLine),
80  0, /* n_preallocs */
81  (GInstanceInitFunc) gnome_canvas_simpleline_init,
82  NULL /* value_table */
83  };
84 
85  simpleline_type = g_type_register_static (GNOME_TYPE_CANVAS_ITEM, "GnomeCanvasSimpleLine",
86  &object_info, 0);
87  }
88 
89  return simpleline_type;
90 }
91 
92 static void
93 gnome_canvas_simpleline_class_init (GnomeCanvasSimpleLineClass *class)
94 {
95  GObjectClass *gobject_class;
96  GtkObjectClass *object_class;
97  GnomeCanvasItemClass *item_class;
98 
99  gobject_class = (GObjectClass *) class;
100  object_class = (GtkObjectClass *) class;
101  item_class = (GnomeCanvasItemClass *) class;
102 
103  parent_class = g_type_class_peek_parent (class);
104 
105  gobject_class->set_property = gnome_canvas_simpleline_set_property;
106  gobject_class->get_property = gnome_canvas_simpleline_get_property;
107 
108  g_object_class_install_property (gobject_class,
109  PROP_X1,
110  g_param_spec_double ("x1",
111  _("x1"),
112  _("x coordinate of upper left corner of rect"),
113  -G_MAXDOUBLE,
114  G_MAXDOUBLE,
115  0.0,
116  G_PARAM_READWRITE));
117 
118  g_object_class_install_property (gobject_class,
119  PROP_Y1,
120  g_param_spec_double ("y1",
121  _("y1"),
122  _("y coordinate of upper left corner of rect "),
123  -G_MAXDOUBLE,
124  G_MAXDOUBLE,
125  0.0,
126  G_PARAM_READWRITE));
127 
128 
129  g_object_class_install_property (gobject_class,
130  PROP_X2,
131  g_param_spec_double ("x2",
132  _("x2"),
133  _("x coordinate of lower right corner of rect"),
134  -G_MAXDOUBLE,
135  G_MAXDOUBLE,
136  0.0,
137  G_PARAM_READWRITE));
138 
139  g_object_class_install_property (gobject_class,
140  PROP_Y2,
141  g_param_spec_double ("y2",
142  _("y2"),
143  _("y coordinate of lower right corner of rect "),
144  -G_MAXDOUBLE,
145  G_MAXDOUBLE,
146  0.0,
147  G_PARAM_READWRITE));
148  g_object_class_install_property (gobject_class,
149  PROP_COLOR_RGBA,
150  g_param_spec_uint ("color_rgba",
151  _("color rgba"),
152  _("color of line"),
153  0,
154  G_MAXUINT,
155  0,
156  G_PARAM_READWRITE));
157 
158  object_class->destroy = gnome_canvas_simpleline_destroy;
159 
160  item_class->update = gnome_canvas_simpleline_update;
161  item_class->bounds = gnome_canvas_simpleline_bounds;
162  item_class->point = gnome_canvas_simpleline_point;
163  item_class->render = gnome_canvas_simpleline_render;
164  item_class->draw = gnome_canvas_simpleline_draw;
165 }
166 
167 static void
168 gnome_canvas_simpleline_init (GnomeCanvasSimpleLine *simpleline)
169 {
170  simpleline->x1 = 0.0;
171  simpleline->y1 = 0.0;
172  simpleline->x2 = 0.0;
173  simpleline->y2 = 0.0;
174  simpleline->color = RGBA_TO_UINT(98,123,174,241);
175 }
176 
177 static void
178 gnome_canvas_simpleline_destroy (GtkObject *object)
179 {
180  g_return_if_fail (object != NULL);
181  g_return_if_fail (GNOME_IS_CANVAS_SIMPLELINE (object));
182 
183  if (GTK_OBJECT_CLASS (parent_class)->destroy)
184  (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
185 }
186 
187 /*
188  * CANVAS CALLBACKS
189  */
190 
191 static void
192 gnome_canvas_simpleline_set_property (GObject *object,
193  guint prop_id,
194  const GValue *value,
195  GParamSpec *pspec)
196 
197 {
198  (void) pspec;
199 
200  GnomeCanvasSimpleLine *simpleline;
201  int update = FALSE;
202  int bounds_changed = FALSE;
203  double d;
204 
205  g_return_if_fail (object != NULL);
206  g_return_if_fail (GNOME_IS_CANVAS_SIMPLELINE (object));
207 
208  simpleline = GNOME_CANVAS_SIMPLELINE (object);
209 
210  switch (prop_id) {
211  case PROP_X1:
212  d = g_value_get_double (value);
213  if (simpleline->x1 != d) {
214  simpleline->x1 = d;
215  bounds_changed = TRUE;
216  }
217  break;
218 
219  case PROP_Y1:
220  d = g_value_get_double (value);
221  if (simpleline->y1 != d) {
222  simpleline->y1 = d;
223  bounds_changed = TRUE;
224  }
225  break;
226 
227  case PROP_X2:
228  d = g_value_get_double (value);
229  if (simpleline->x2 != d) {
230  simpleline->x2 = d;
231  bounds_changed = TRUE;
232  }
233  break;
234 
235  case PROP_Y2:
236  d = g_value_get_double (value);
237  if (simpleline->y2 != d) {
238  simpleline->y2 = d;
239  bounds_changed = TRUE;
240  }
241  break;
242 
243  case PROP_COLOR_RGBA:
244  if (simpleline->color != g_value_get_uint(value)) {
245  simpleline->color = g_value_get_uint(value);
246  UINT_TO_RGBA (simpleline->color, &simpleline->r, &simpleline->g, &simpleline->b, &simpleline->a);
247  update = TRUE;
248  }
249  break;
250  default:
251  break;
252  }
253 
254  if (update || bounds_changed) {
255  gnome_canvas_item_request_update (GNOME_CANVAS_ITEM(object));
256  }
257 }
258 
259 static void
260 gnome_canvas_simpleline_get_property (GObject *object,
261  guint prop_id,
262  GValue *value,
263  GParamSpec *pspec)
264 {
265  g_return_if_fail (object != NULL);
266  g_return_if_fail (GNOME_IS_CANVAS_SIMPLELINE (object));
267 
268  GnomeCanvasSimpleLine *line = GNOME_CANVAS_SIMPLELINE (object);
269 
270  switch (prop_id) {
271  case PROP_X1:
272  g_value_set_double (value, line->x1);
273  break;
274  case PROP_X2:
275  g_value_set_double (value, line->x2);
276  break;
277  case PROP_Y1:
278  g_value_set_double (value, line->y1);
279  break;
280  case PROP_Y2:
281  g_value_set_double (value, line->y2);
282  break;
283  case PROP_COLOR_RGBA:
284  g_value_set_uint (value, line->color);
285  break;
286  default:
287  G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
288  break;
289  }
290 }
291 
292 static void
293 gnome_canvas_simpleline_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
294 {
295  GnomeCanvasSimpleLine *simpleline;
296  double x1, x2, y1, y2;
297 
298  simpleline = GNOME_CANVAS_SIMPLELINE (item);
299 
300  if (parent_class->update)
301  (* parent_class->update) (item, affine, clip_path, flags);
302 
303  /* redraw old location */
304 
305  gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2, item->y2);
306 
307  /* get current bounding box in parent-relative world coordinates */
308 
309  gnome_canvas_simpleline_bounds (item, &x1, &y1, &x2, &y2);
310 
311  /* convert parent-relative item coordinates to world coordinates */
312 
313  gnome_canvas_item_i2w (item, &x1, &y1);
314  gnome_canvas_item_i2w (item, &x2, &y2);
315 
316  /* don't suffer from rounding errors */
317 
318  x1 = floor (x1);
319  y1 = floor (y1);
320  x2 = ceil (x2);
321  y2 = ceil (y2);
322 
323  /* force non-zero dimensionality for both axes */
324 
325  if (x1 == x2) {
326  x2 += 1.0;
327  }
328 
329  if (y1 == y2) {
330  y2 += 1.0;
331  }
332 
333  /* reset item bounding box (canvas coordinates, so integral. but stored in doubles) */
334 
335  gnome_canvas_w2c_d (GNOME_CANVAS(item->canvas), x1, y1, &item->x1, &item->y1);
336  gnome_canvas_w2c_d (GNOME_CANVAS(item->canvas), x2, y2, &item->x2, &item->y2);
337 
338  /* redraw new location */
339 
340  gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2, item->y2);
341 
342  /* store actual line coords as canvas coordinates for use in render() */
343 
344  x1 = simpleline->x1;
345  y1 = simpleline->y1;
346  x2 = simpleline->x2;
347  y2 = simpleline->y2;
348  /* convert to world */
349  gnome_canvas_item_i2w (item, &x1, &y1);
350  gnome_canvas_item_i2w (item, &x2, &y2);
351  /* avoid rounding errors */
352  x1 = (int) floor (item->x1);
353  y1 = (int) floor (item->y1);
354  x2 = (int) ceil (item->x2);
355  y2 = (int) ceil (item->y2);
356  /* convert to canvas coordinates, integral, stored in integers */
357  gnome_canvas_w2c (GNOME_CANVAS(item->canvas), x1, y1, &simpleline->cx1, &simpleline->cy1);
358  gnome_canvas_w2c (GNOME_CANVAS(item->canvas), x2, y2, &simpleline->cx2, &simpleline->cy2);
359 }
360 
361 static void
362 gnome_canvas_simpleline_render (GnomeCanvasItem *item,
363  GnomeCanvasBuf *buf)
364 {
365  GnomeCanvasSimpleLine *simpleline;
366  int x1, x2;
367  int y1, y2;
368 
369  simpleline = GNOME_CANVAS_SIMPLELINE (item);
370 
371  x1 = simpleline->cx1;
372  x2 = simpleline->cx2;
373  y1 = simpleline->cy1;
374 
375  if (buf->is_bg) {
376  gnome_canvas_buf_ensure_buf (buf);
377  buf->is_bg = FALSE;
378  }
379 
380  if (simpleline->x1 != simpleline->x2) {
381  PAINT_HORIZA(buf, simpleline->r, simpleline->g, simpleline->b, simpleline->a,
382  x1, x2, y1);
383  } else {
384  y2 = simpleline->cy2;
385  PAINT_VERTA (buf, simpleline->r, simpleline->g, simpleline->b, simpleline->a,
386  x1, y1, y2);
387 
388  }
389 }
390 
391 static void
392 gnome_canvas_simpleline_draw (GnomeCanvasItem* canvas,
393  GdkDrawable* drawable,
394  int x, int y,
395  int width, int height)
396 {
397  /* XXX not implemented */
398 }
399 
400 static void
401 gnome_canvas_simpleline_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
402 {
403  GnomeCanvasSimpleLine *simpleline = GNOME_CANVAS_SIMPLELINE (item);
404 
405  *x1 = simpleline->x1;
406  *y1 = simpleline->y1;
407  *x2 = simpleline->x1;
408  *y2 = simpleline->y2;
409 }
410 
411 static double
412 gnome_canvas_simpleline_point (GnomeCanvasItem *item, double x, double y, int cx, int cy, GnomeCanvasItem **actual_item)
413 {
414  (void) cx;
415  (void) cy;
416 
417  double x1, y1, x2, y2;
418  double dx, dy;
419 
420  *actual_item = item;
421 
422  /* Find the bounds for the line */
423 
424  gnome_canvas_simpleline_bounds (item, &x1, &y1, &x2, &y2);
425 
426  /* Is point inside line */
427 
428  if ((x >= x1) && (y >= y1) && (x <= x2) && (y <= y2)) {
429  return 0.0;
430  }
431  /* Point is outside line */
432 
433  if (x < x1)
434  dx = x1 - x;
435  else if (x > x2)
436  dx = x - x2;
437  else
438  dx = 0.0;
439 
440  if (y < y1)
441  dy = y1 - y;
442  else if (y > y2)
443  dy = y - y2;
444  else
445  dy = 0.0;
446 
447  return sqrt (dx * dx + dy * dy);
448 }
gnome_canvas_simpleline_update
static void gnome_canvas_simpleline_update(GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
Definition: canvas-simpleline.c:293
gnome_canvas_simpleline_set_property
static void gnome_canvas_simpleline_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
Definition: canvas-simpleline.c:192
_
#define _(Text)
Definition: canvas-simpleline.c:9
gnome_canvas_simpleline_class_init
static void gnome_canvas_simpleline_class_init(GnomeCanvasSimpleLineClass *class)
Definition: canvas-simpleline.c:93
gnome_canvas_simpleline_destroy
static void gnome_canvas_simpleline_destroy(GtkObject *object)
Definition: canvas-simpleline.c:178
parent_class
static GnomeCanvasItemClass * parent_class
Definition: canvas-simpleline.c:63
gnome_canvas_simpleline_init
static void gnome_canvas_simpleline_init(GnomeCanvasSimpleLine *simpleline)
Definition: canvas-simpleline.c:168
UINT_TO_RGBA
#define UINT_TO_RGBA(u, r, g, b, a)
Definition: fastmeter.cc:35
gnome_canvas_simpleline_get_property
static void gnome_canvas_simpleline_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
Definition: canvas-simpleline.c:260
gnome_canvas_simpleline_bounds
static void gnome_canvas_simpleline_bounds(GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
Definition: canvas-simpleline.c:401
gnome_canvas_simpleline_get_type
GType gnome_canvas_simpleline_get_type(void)
Definition: canvas-simpleline.c:67
PAINT_HORIZA
#define PAINT_HORIZA(inbuf, colr, colg, colb, cola, ptx0, ptx1, pty)
Definition: rgb_macros.h:167
gettext.h
gnome_canvas_simpleline_point
static double gnome_canvas_simpleline_point(GnomeCanvasItem *item, double x, double y, int cx, int cy, GnomeCanvasItem **actual_item)
Definition: canvas-simpleline.c:412
gnome_canvas_simpleline_draw
static void gnome_canvas_simpleline_draw(GnomeCanvasItem *item, GdkDrawable *drawable, int x, int y, int w, int h)
Definition: canvas-simpleline.c:392
PAINT_VERTA
#define PAINT_VERTA(inbuf, colr, colg, colb, cola, ptx, pty0, pty1)
Definition: rgb_macros.h:222
gnome_canvas_simpleline_render
static void gnome_canvas_simpleline_render(GnomeCanvasItem *item, GnomeCanvasBuf *buf)
Definition: canvas-simpleline.c:362
rgb_macros.h
RGBA_TO_UINT
#define RGBA_TO_UINT(r, g, b, a)
Definition: rgb_macros.h:34
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