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comparison src/xs_curve.c @ 374:58079c6180a0

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More removal of original curve code.
author Matti Hamalainen <ccr@tnsp.org>
date Wed, 09 Nov 2005 10:01:03 +0000
parents df6f12a00305
children 0f255a575720
comparison
equal deleted inserted replaced
373:684d09ff564b 374:58079c6180a0
1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 1997 David Mosberger
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
18 */
19
20 /*
21 * Modified by the GTK+ Team and others 1997-1999. See the AUTHORS
22 * file for a list of people on the GTK+ Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
25 */
26
27 #include <stdlib.h> 1 #include <stdlib.h>
28 #include <string.h> 2 #include <string.h>
29 #include <math.h> 3 #include <math.h>
30 4
31 #include "xs_curve.h" 5 #include "xs_curve.h"
54 ARG_MIN_Y, 28 ARG_MIN_Y,
55 ARG_MAX_Y 29 ARG_MAX_Y
56 }; 30 };
57 31
58 static GtkDrawingAreaClass *parent_class = NULL; 32 static GtkDrawingAreaClass *parent_class = NULL;
59 static guint curve_type_changed_signal = 0;
60 33
61 34
62 /* forward declarations: */ 35 /* forward declarations: */
63 static void xs_curve_class_init(XSCurveClass * class); 36 static void xs_curve_class_init(XSCurveClass * class);
64 static void xs_curve_init(XSCurve * curve); 37 static void xs_curve_init(XSCurve * curve);
99 72
100 object_class->set_arg = xs_curve_set_arg; 73 object_class->set_arg = xs_curve_set_arg;
101 object_class->get_arg = xs_curve_get_arg; 74 object_class->get_arg = xs_curve_get_arg;
102 object_class->finalize = xs_curve_finalize; 75 object_class->finalize = xs_curve_finalize;
103 76
104 curve_type_changed_signal =
105 gtk_signal_new("curve_type_changed", GTK_RUN_FIRST, object_class->type,
106 GTK_SIGNAL_OFFSET(XSCurveClass, curve_type_changed),
107 gtk_marshal_NONE__NONE, GTK_TYPE_NONE, 0);
108 gtk_object_class_add_signals(object_class, &curve_type_changed_signal, 1);
109
110 gtk_object_add_arg_type("XSCurve::curve_type", GTK_TYPE_CURVE_TYPE, GTK_ARG_READWRITE, ARG_CURVE_TYPE);
111 gtk_object_add_arg_type("XSCurve::min_x", GTK_TYPE_FLOAT, GTK_ARG_READWRITE, ARG_MIN_X); 77 gtk_object_add_arg_type("XSCurve::min_x", GTK_TYPE_FLOAT, GTK_ARG_READWRITE, ARG_MIN_X);
112 gtk_object_add_arg_type("XSCurve::max_x", GTK_TYPE_FLOAT, GTK_ARG_READWRITE, ARG_MAX_X); 78 gtk_object_add_arg_type("XSCurve::max_x", GTK_TYPE_FLOAT, GTK_ARG_READWRITE, ARG_MAX_X);
113 gtk_object_add_arg_type("XSCurve::min_y", GTK_TYPE_FLOAT, GTK_ARG_READWRITE, ARG_MIN_Y); 79 gtk_object_add_arg_type("XSCurve::min_y", GTK_TYPE_FLOAT, GTK_ARG_READWRITE, ARG_MIN_Y);
114 gtk_object_add_arg_type("XSCurve::max_y", GTK_TYPE_FLOAT, GTK_ARG_READWRITE, ARG_MAX_Y); 80 gtk_object_add_arg_type("XSCurve::max_y", GTK_TYPE_FLOAT, GTK_ARG_READWRITE, ARG_MAX_Y);
115 } 81 }
116 82
117 static void xs_curve_init(XSCurve * curve) 83 static void xs_curve_init(XSCurve * curve)
118 { 84 {
119 gint old_mask; 85 gint old_mask;
120 86
121 curve->cursor_type = GDK_TOP_LEFT_ARROW;
122 curve->pixmap = NULL; 87 curve->pixmap = NULL;
123 curve->curve_type = GTK_CURVE_TYPE_SPLINE;
124 curve->height = 0; 88 curve->height = 0;
125 curve->grab_point = -1; 89 curve->grab_point = -1;
126 90
127 curve->num_points = 0; 91 curve->num_points = 0;
128 curve->point = 0; 92 curve->point = 0;
144 static void xs_curve_set_arg(GtkObject * object, GtkArg * arg, guint arg_id) 108 static void xs_curve_set_arg(GtkObject * object, GtkArg * arg, guint arg_id)
145 { 109 {
146 XSCurve *curve = XS_CURVE(object); 110 XSCurve *curve = XS_CURVE(object);
147 111
148 switch (arg_id) { 112 switch (arg_id) {
149 case ARG_CURVE_TYPE:
150 xs_curve_set_curve_type(curve, GTK_VALUE_ENUM(*arg));
151 break;
152 case ARG_MIN_X: 113 case ARG_MIN_X:
153 xs_curve_set_range(curve, GTK_VALUE_FLOAT(*arg), curve->max_x, curve->min_y, curve->max_y); 114 xs_curve_set_range(curve, GTK_VALUE_FLOAT(*arg), curve->max_x, curve->min_y, curve->max_y);
154 break; 115 break;
155 case ARG_MAX_X: 116 case ARG_MAX_X:
156 xs_curve_set_range(curve, curve->min_x, GTK_VALUE_FLOAT(*arg), curve->min_y, curve->max_y); 117 xs_curve_set_range(curve, curve->min_x, GTK_VALUE_FLOAT(*arg), curve->min_y, curve->max_y);
167 static void xs_curve_get_arg(GtkObject * object, GtkArg * arg, guint arg_id) 128 static void xs_curve_get_arg(GtkObject * object, GtkArg * arg, guint arg_id)
168 { 129 {
169 XSCurve *curve = XS_CURVE(object); 130 XSCurve *curve = XS_CURVE(object);
170 131
171 switch (arg_id) { 132 switch (arg_id) {
172 case ARG_CURVE_TYPE:
173 GTK_VALUE_ENUM(*arg) = curve->curve_type;
174 break;
175 case ARG_MIN_X: 133 case ARG_MIN_X:
176 GTK_VALUE_FLOAT(*arg) = curve->min_x; 134 GTK_VALUE_FLOAT(*arg) = curve->min_x;
177 break; 135 break;
178 case ARG_MAX_X: 136 case ARG_MAX_X:
179 GTK_VALUE_FLOAT(*arg) = curve->max_x; 137 GTK_VALUE_FLOAT(*arg) = curve->max_x;
188 arg->type = GTK_TYPE_INVALID; 146 arg->type = GTK_TYPE_INVALID;
189 break; 147 break;
190 } 148 }
191 } 149 }
192 150
193 static int project(gfloat value, gfloat min, gfloat max, int norm) 151 static int xs_project(gfloat value, gfloat min, gfloat max, int norm)
194 { 152 {
195 return (norm - 1) * ((value - min) / (max - min)) + 0.5; 153 return (norm - 1) * ((value - min) / (max - min)) + 0.5;
196 } 154 }
197 155
198 static gfloat unproject(gint value, gfloat min, gfloat max, int norm) 156 static gfloat xs_unproject(gint value, gfloat min, gfloat max, int norm)
199 { 157 {
200 return value / (gfloat) (norm - 1) * (max - min) + min; 158 return value / (gfloat) (norm - 1) * (max - min) + min;
201 } 159 }
202 160
203 /* Solve the tridiagonal equation system that determines the second 161 /* Solve the tridiagonal equation system that determines the second
253 } 211 }
254 212
255 static void xs_curve_interpolate(XSCurve * c, gint width, gint height) 213 static void xs_curve_interpolate(XSCurve * c, gint width, gint height)
256 { 214 {
257 gfloat *vector; 215 gfloat *vector;
258 int i; 216 gint i;
259 217
260 vector = g_malloc(width * sizeof(vector[0])); 218 vector = g_malloc(width * sizeof(vector[0]));
261 219
262 xs_curve_get_vector(c, width, vector); 220 xs_curve_get_vector(c, width, vector);
263 221
294 state = GTK_STATE_INSENSITIVE; 252 state = GTK_STATE_INSENSITIVE;
295 253
296 style = GTK_WIDGET(c)->style; 254 style = GTK_WIDGET(c)->style;
297 255
298 /* clear the pixmap: */ 256 /* clear the pixmap: */
299 gtk_paint_flat_box(style, c->pixmap, GTK_STATE_NORMAL, GTK_SHADOW_NONE, 257 gtk_paint_flat_box(style, c->pixmap,
300 NULL, GTK_WIDGET(c), "curve_bg", 0, 0, width + RADIUS * 2, height + RADIUS * 2); 258 GTK_STATE_NORMAL, GTK_SHADOW_NONE,
259 NULL, GTK_WIDGET(c), "curve_bg",
260 0, 0, width + RADIUS * 2, height + RADIUS * 2);
261
301 /* draw the grid lines: (XXX make more meaningful) */ 262 /* draw the grid lines: (XXX make more meaningful) */
302 for (i = 0; i < 5; i++) { 263 for (i = 0; i < 5; i++) {
303 gdk_draw_line(c->pixmap, style->dark_gc[state], 264 gdk_draw_line(c->pixmap, style->dark_gc[state],
304 RADIUS, i * (height / 4.0) + RADIUS, width + RADIUS, i * (height / 4.0) + RADIUS); 265 RADIUS, i * (height / 4.0) + RADIUS,
266 width + RADIUS, i * (height / 4.0) + RADIUS);
267
305 gdk_draw_line(c->pixmap, style->dark_gc[state], 268 gdk_draw_line(c->pixmap, style->dark_gc[state],
306 i * (width / 4.0) + RADIUS, RADIUS, i * (width / 4.0) + RADIUS, height + RADIUS); 269 i * (width / 4.0) + RADIUS, RADIUS,
270 i * (width / 4.0) + RADIUS, height + RADIUS);
307 } 271 }
308 272
309 gdk_draw_points(c->pixmap, style->fg_gc[state], c->point, c->num_points); 273 gdk_draw_points(c->pixmap, style->fg_gc[state], c->point, c->num_points);
310 if (c->curve_type != GTK_CURVE_TYPE_FREE)
311 for (i = 0; i < c->num_ctlpoints; ++i) {
312 gint x, y;
313
314 if (c->ctlpoint[i][0] < c->min_x)
315 continue;
316
317 x = project(c->ctlpoint[i][0], c->min_x, c->max_x, width);
318 y = height - project(c->ctlpoint[i][1], c->min_y, c->max_y, height);
319
320 /* draw a bullet: */
321 gdk_draw_arc(c->pixmap, style->fg_gc[state], TRUE, x, y, RADIUS * 2, RADIUS * 2, 0, 360 * 64);
322 }
323 274
324 gdk_draw_pixmap(GTK_WIDGET(c)->window, style->fg_gc[state], c->pixmap, 275 gdk_draw_pixmap(GTK_WIDGET(c)->window, style->fg_gc[state], c->pixmap,
325 0, 0, 0, 0, width + RADIUS * 2, height + RADIUS * 2); 276 0, 0, 0, 0, width + RADIUS * 2, height + RADIUS * 2);
326 } 277 }
327 278
328 static gint xs_curve_graph_events(GtkWidget * widget, GdkEvent * event, XSCurve * c) 279 static gint xs_curve_graph_events(GtkWidget * widget, GdkEvent * event, XSCurve * c)
329 { 280 {
330 GdkCursorType new_type = c->cursor_type;
331 gint i, src, dst, leftbound, rightbound; 281 gint i, src, dst, leftbound, rightbound;
332 GdkEventButton *bevent; 282 GdkEventButton *bevent;
333 GdkEventMotion *mevent; 283 GdkEventMotion *mevent;
334 GtkWidget *w; 284 GtkWidget *w;
335 gint tx, ty; 285 gint tx, ty;
343 width = w->allocation.width - RADIUS * 2; 293 width = w->allocation.width - RADIUS * 2;
344 height = w->allocation.height - RADIUS * 2; 294 height = w->allocation.height - RADIUS * 2;
345 295
346 if ((width < 0) || (height < 0)) 296 if ((width < 0) || (height < 0))
347 return FALSE; 297 return FALSE;
348 298
349 /* get the pointer position */
350 gdk_window_get_pointer(w->window, &tx, &ty, NULL);
351 x = CLAMP((tx - RADIUS), 0, width - 1);
352 y = CLAMP((ty - RADIUS), 0, height - 1);
353
354 min_x = c->min_x;
355
356 distance = ~0U;
357 for (i = 0; i < c->num_ctlpoints; ++i) {
358 cx = project(c->ctlpoint[i][0], min_x, c->max_x, width);
359 if ((guint) abs(x - cx) < distance) {
360 distance = abs(x - cx);
361 closest_point = i;
362 }
363 }
364
365 switch (event->type) {
366 case GDK_CONFIGURE:
367 if (c->pixmap)
368 gdk_pixmap_unref(c->pixmap);
369 c->pixmap = 0;
370 /* fall through */
371 case GDK_EXPOSE:
372 if (!c->pixmap)
373 c->pixmap = gdk_pixmap_new(w->window, w->allocation.width, w->allocation.height, -1);
374 xs_curve_draw(c, width, height);
375 break;
376
377 case GDK_BUTTON_PRESS:
378 gtk_grab_add(widget);
379
380 bevent = (GdkEventButton *) event;
381 new_type = GDK_TCROSS;
382
383 switch (c->curve_type) {
384 case GTK_CURVE_TYPE_LINEAR:
385 case GTK_CURVE_TYPE_SPLINE:
386 if (distance > MIN_DISTANCE) {
387 /* insert a new control point */
388 if (c->num_ctlpoints > 0) {
389 cx = project(c->ctlpoint[closest_point][0], min_x, c->max_x, width);
390 if (x > cx)
391 ++closest_point;
392 }
393 ++c->num_ctlpoints;
394 c->ctlpoint = g_realloc(c->ctlpoint, c->num_ctlpoints * sizeof(*c->ctlpoint));
395 for (i = c->num_ctlpoints - 1; i > closest_point; --i)
396 memcpy(c->ctlpoint + i, c->ctlpoint + i - 1, sizeof(*c->ctlpoint));
397 }
398 c->grab_point = closest_point;
399 c->ctlpoint[c->grab_point][0] = unproject(x, min_x, c->max_x, width);
400 c->ctlpoint[c->grab_point][1] = unproject(height - y, c->min_y, c->max_y, height);
401
402 xs_curve_interpolate(c, width, height);
403 break;
404
405 case GTK_CURVE_TYPE_FREE:
406 c->point[x].x = RADIUS + x;
407 c->point[x].y = RADIUS + y;
408 c->grab_point = x;
409 c->last = y;
410 break;
411 }
412 xs_curve_draw(c, width, height);
413 break;
414
415 case GDK_BUTTON_RELEASE:
416 gtk_grab_remove(widget);
417
418 /* delete inactive points: */
419 if (c->curve_type != GTK_CURVE_TYPE_FREE) {
420 for (src = dst = 0; src < c->num_ctlpoints; ++src) {
421 if (c->ctlpoint[src][0] >= min_x) {
422 memcpy(c->ctlpoint + dst, c->ctlpoint + src, sizeof(*c->ctlpoint));
423 ++dst;
424 }
425 }
426 if (dst < src) {
427 c->num_ctlpoints -= (src - dst);
428 if (c->num_ctlpoints <= 0) {
429 c->num_ctlpoints = 1;
430 c->ctlpoint[0][0] = min_x;
431 c->ctlpoint[0][1] = c->min_y;
432 xs_curve_interpolate(c, width, height);
433 xs_curve_draw(c, width, height);
434 }
435 c->ctlpoint = g_realloc(c->ctlpoint, c->num_ctlpoints * sizeof(*c->ctlpoint));
436 }
437 }
438 new_type = GDK_FLEUR;
439 c->grab_point = -1;
440 break;
441
442 case GDK_MOTION_NOTIFY:
443 mevent = (GdkEventMotion *) event;
444
445 switch (c->curve_type) {
446 case GTK_CURVE_TYPE_LINEAR:
447 case GTK_CURVE_TYPE_SPLINE:
448 if (c->grab_point == -1) {
449 /* if no point is grabbed... */
450 if (distance <= MIN_DISTANCE)
451 new_type = GDK_FLEUR;
452 else
453 new_type = GDK_TCROSS;
454 } else {
455 /* drag the grabbed point */
456 new_type = GDK_TCROSS;
457
458 leftbound = -MIN_DISTANCE;
459 if (c->grab_point > 0)
460 leftbound = project(c->ctlpoint[c->grab_point - 1][0], min_x, c->max_x, width);
461
462 rightbound = width + RADIUS * 2 + MIN_DISTANCE;
463 if (c->grab_point + 1 < c->num_ctlpoints)
464 rightbound = project(c->ctlpoint[c->grab_point + 1][0], min_x, c->max_x, width);
465
466 if (tx <= leftbound || tx >= rightbound
467 || ty > height + RADIUS * 2 + MIN_DISTANCE || ty < -MIN_DISTANCE)
468 c->ctlpoint[c->grab_point][0] = min_x - 1.0;
469 else {
470 rx = unproject(x, min_x, c->max_x, width);
471 ry = unproject(height - y, c->min_y, c->max_y, height);
472 c->ctlpoint[c->grab_point][0] = rx;
473 c->ctlpoint[c->grab_point][1] = ry;
474 }
475 xs_curve_interpolate(c, width, height);
476 xs_curve_draw(c, width, height);
477 }
478 break;
479
480 case GTK_CURVE_TYPE_FREE:
481 if (c->grab_point != -1) {
482 if (c->grab_point > x) {
483 x1 = x;
484 x2 = c->grab_point;
485 y1 = y;
486 y2 = c->last;
487 } else {
488 x1 = c->grab_point;
489 x2 = x;
490 y1 = c->last;
491 y2 = y;
492 }
493
494 if (x2 != x1)
495 for (i = x1; i <= x2; i++) {
496 c->point[i].x = RADIUS + i;
497 c->point[i].y = RADIUS + (y1 + ((y2 - y1) * (i - x1)) / (x2 - x1));
498 } else {
499 c->point[x].x = RADIUS + x;
500 c->point[x].y = RADIUS + y;
501 }
502 c->grab_point = x;
503 c->last = y;
504 xs_curve_draw(c, width, height);
505 }
506 if (mevent->state & GDK_BUTTON1_MASK)
507 new_type = GDK_TCROSS;
508 else
509 new_type = GDK_PENCIL;
510 break;
511 }
512 if (new_type != (GdkCursorType) c->cursor_type) {
513 GdkCursor *cursor;
514
515 c->cursor_type = new_type;
516
517 cursor = gdk_cursor_new(c->cursor_type);
518 gdk_window_set_cursor(w->window, cursor);
519 gdk_cursor_destroy(cursor);
520 }
521 break;
522
523 default:
524 break;
525 }
526 return FALSE; 299 return FALSE;
527 }
528
529 void xs_curve_set_curve_type(XSCurve * c, GtkCurveType new_type)
530 {
531 gfloat rx, dx;
532 gint x, i;
533
534 if (new_type != c->curve_type) {
535 gint width, height;
536
537 width = GTK_WIDGET(c)->allocation.width - RADIUS * 2;
538 height = GTK_WIDGET(c)->allocation.height - RADIUS * 2;
539
540 if (new_type == GTK_CURVE_TYPE_FREE) {
541 xs_curve_interpolate(c, width, height);
542 c->curve_type = new_type;
543 } else if (c->curve_type == GTK_CURVE_TYPE_FREE) {
544 if (c->ctlpoint)
545 g_free(c->ctlpoint);
546 c->num_ctlpoints = 9;
547 c->ctlpoint = g_malloc(c->num_ctlpoints * sizeof(*c->ctlpoint));
548
549 rx = 0.0;
550 dx = (width - 1) / (gfloat) (c->num_ctlpoints - 1);
551
552 for (i = 0; i < c->num_ctlpoints; ++i, rx += dx) {
553 x = (int) (rx + 0.5);
554 c->ctlpoint[i][0] = unproject(x, c->min_x, c->max_x, width);
555 c->ctlpoint[i][1] =
556 unproject(RADIUS + height - c->point[x].y, c->min_y, c->max_y, height);
557 }
558 c->curve_type = new_type;
559 xs_curve_interpolate(c, width, height);
560 } else {
561 c->curve_type = new_type;
562 xs_curve_interpolate(c, width, height);
563 }
564 gtk_signal_emit(GTK_OBJECT(c), curve_type_changed_signal);
565 xs_curve_draw(c, width, height);
566 }
567 } 300 }
568 301
569 static void xs_curve_size_graph(XSCurve * curve) 302 static void xs_curve_size_graph(XSCurve * curve)
570 { 303 {
571 gint width, height; 304 gint width, height;
587 gtk_drawing_area_size(GTK_DRAWING_AREA(curve), width + RADIUS * 2, height + RADIUS * 2); 320 gtk_drawing_area_size(GTK_DRAWING_AREA(curve), width + RADIUS * 2, height + RADIUS * 2);
588 } 321 }
589 322
590 static void xs_curve_reset_vector(XSCurve * curve) 323 static void xs_curve_reset_vector(XSCurve * curve)
591 { 324 {
592 if (curve->ctlpoint)
593 g_free(curve->ctlpoint);
594
595 curve->num_ctlpoints = 2;
596 curve->ctlpoint = g_malloc(2 * sizeof(curve->ctlpoint[0]));
597 curve->ctlpoint[0][0] = curve->min_x;
598 curve->ctlpoint[0][1] = curve->min_y;
599 curve->ctlpoint[1][0] = curve->max_x;
600 curve->ctlpoint[1][1] = curve->max_y;
601
602 if (curve->pixmap) {
603 gint width, height;
604
605 width = GTK_WIDGET(curve)->allocation.width - RADIUS * 2;
606 height = GTK_WIDGET(curve)->allocation.height - RADIUS * 2;
607
608 if (curve->curve_type == GTK_CURVE_TYPE_FREE) {
609 curve->curve_type = GTK_CURVE_TYPE_LINEAR;
610 xs_curve_interpolate(curve, width, height);
611 curve->curve_type = GTK_CURVE_TYPE_FREE;
612 } else
613 xs_curve_interpolate(curve, width, height);
614 xs_curve_draw(curve, width, height);
615 }
616 } 325 }
617 326
618 void xs_curve_reset(XSCurve * c) 327 void xs_curve_reset(XSCurve * c)
619 { 328 {
620 GtkCurveType old_type; 329 }
621 330
622 old_type = c->curve_type;
623 c->curve_type = GTK_CURVE_TYPE_SPLINE;
624 xs_curve_reset_vector(c);
625
626 if (old_type != GTK_CURVE_TYPE_SPLINE)
627 gtk_signal_emit(GTK_OBJECT(c), curve_type_changed_signal);
628 }
629
630 void xs_curve_set_gamma(XSCurve * c, gfloat gamma)
631 {
632 gfloat x, one_over_gamma, height, one_over_width;
633 GtkCurveType old_type;
634 gint i;
635
636 if (c->num_points < 2)
637 return;
638
639 old_type = c->curve_type;
640 c->curve_type = GTK_CURVE_TYPE_FREE;
641
642 if (gamma <= 0)
643 one_over_gamma = 1.0;
644 else
645 one_over_gamma = 1.0 / gamma;
646 one_over_width = 1.0 / (c->num_points - 1);
647 height = c->height;
648 for (i = 0; i < c->num_points; ++i) {
649 x = (gfloat) i / (c->num_points - 1);
650 c->point[i].x = RADIUS + i;
651 c->point[i].y = RADIUS + (height * (1.0 - pow(x, one_over_gamma)) + 0.5);
652 }
653
654 if (old_type != GTK_CURVE_TYPE_FREE)
655 gtk_signal_emit(GTK_OBJECT(c), curve_type_changed_signal);
656
657 xs_curve_draw(c, c->num_points, c->height);
658 }
659 331
660 void xs_curve_set_range(XSCurve * curve, gfloat min_x, gfloat max_x, gfloat min_y, gfloat max_y) 332 void xs_curve_set_range(XSCurve * curve, gfloat min_x, gfloat max_x, gfloat min_y, gfloat max_y)
661 { 333 {
662 curve->min_x = min_x; 334 curve->min_x = min_x;
663 curve->max_x = max_x; 335 curve->max_x = max_x;
666 338
667 xs_curve_size_graph(curve); 339 xs_curve_size_graph(curve);
668 xs_curve_reset_vector(curve); 340 xs_curve_reset_vector(curve);
669 } 341 }
670 342
671 void xs_curve_set_vector(XSCurve * c, int veclen, gfloat vector[])
672 {
673 GtkCurveType old_type;
674 gfloat rx, dx, ry;
675 gint i, height;
676
677 old_type = c->curve_type;
678 c->curve_type = GTK_CURVE_TYPE_FREE;
679
680 if (c->point)
681 height = GTK_WIDGET(c)->allocation.height - RADIUS * 2;
682 else {
683 height = (c->max_y - c->min_y);
684 if (height > gdk_screen_height() / 4)
685 height = gdk_screen_height() / 4;
686
687 c->height = height;
688 c->num_points = veclen;
689 c->point = g_malloc(c->num_points * sizeof(c->point[0]));
690 }
691 rx = 0;
692 dx = (veclen - 1.0) / (c->num_points - 1.0);
693
694 for (i = 0; i < c->num_points; ++i, rx += dx) {
695 ry = vector[(int) (rx + 0.5)];
696 if (ry > c->max_y)
697 ry = c->max_y;
698 if (ry < c->min_y)
699 ry = c->min_y;
700 c->point[i].x = RADIUS + i;
701 c->point[i].y = RADIUS + height - project(ry, c->min_y, c->max_y, height);
702 }
703 if (old_type != GTK_CURVE_TYPE_FREE)
704 gtk_signal_emit(GTK_OBJECT(c), curve_type_changed_signal);
705
706 xs_curve_draw(c, c->num_points, height);
707 }
708
709 void xs_curve_get_vector(XSCurve * c, int veclen, gfloat vector[])
710 {
711 gfloat rx, ry, dx, dy, min_x, delta_x, *mem, *xv, *yv, *y2v, prev;
712 gint dst, i, x, next, num_active_ctlpoints = 0, first_active = -1;
713
714 min_x = c->min_x;
715
716 if (c->curve_type != GTK_CURVE_TYPE_FREE) {
717 /* count active points: */
718 prev = min_x - 1.0;
719 for (i = num_active_ctlpoints = 0; i < c->num_ctlpoints; ++i)
720 if (c->ctlpoint[i][0] > prev) {
721 if (first_active < 0)
722 first_active = i;
723 prev = c->ctlpoint[i][0];
724 ++num_active_ctlpoints;
725 }
726
727 /* handle degenerate case: */
728 if (num_active_ctlpoints < 2) {
729 if (num_active_ctlpoints > 0)
730 ry = c->ctlpoint[first_active][1];
731 else
732 ry = c->min_y;
733 if (ry < c->min_y)
734 ry = c->min_y;
735 if (ry > c->max_y)
736 ry = c->max_y;
737 for (x = 0; x < veclen; ++x)
738 vector[x] = ry;
739 return;
740 }
741 }
742
743 switch (c->curve_type) {
744 case GTK_CURVE_TYPE_SPLINE:
745 mem = g_malloc(3 * num_active_ctlpoints * sizeof(gfloat));
746 xv = mem;
747 yv = mem + num_active_ctlpoints;
748 y2v = mem + 2 * num_active_ctlpoints;
749
750 prev = min_x - 1.0;
751 for (i = dst = 0; i < c->num_ctlpoints; ++i)
752 if (c->ctlpoint[i][0] > prev) {
753 prev = c->ctlpoint[i][0];
754 xv[dst] = c->ctlpoint[i][0];
755 yv[dst] = c->ctlpoint[i][1];
756 ++dst;
757 }
758
759 spline_solve(num_active_ctlpoints, xv, yv, y2v);
760
761 rx = min_x;
762 dx = (c->max_x - min_x) / (veclen - 1);
763 for (x = 0; x < veclen; ++x, rx += dx) {
764 ry = spline_eval(num_active_ctlpoints, xv, yv, y2v, rx);
765 if (ry < c->min_y)
766 ry = c->min_y;
767 if (ry > c->max_y)
768 ry = c->max_y;
769 vector[x] = ry;
770 }
771
772 g_free(mem);
773 break;
774
775 case GTK_CURVE_TYPE_LINEAR:
776 dx = (c->max_x - min_x) / (veclen - 1);
777 rx = min_x;
778 ry = c->min_y;
779 dy = 0.0;
780 i = first_active;
781 for (x = 0; x < veclen; ++x, rx += dx) {
782 if (rx >= c->ctlpoint[i][0]) {
783 if (rx > c->ctlpoint[i][0])
784 ry = c->min_y;
785 dy = 0.0;
786 next = i + 1;
787 while (next < c->num_ctlpoints && c->ctlpoint[next][0] <= c->ctlpoint[i][0])
788 ++next;
789 if (next < c->num_ctlpoints) {
790 delta_x = c->ctlpoint[next][0] - c->ctlpoint[i][0];
791 dy = ((c->ctlpoint[next][1] - c->ctlpoint[i][1])
792 / delta_x);
793 dy *= dx;
794 ry = c->ctlpoint[i][1];
795 i = next;
796 }
797 }
798 vector[x] = ry;
799 ry += dy;
800 }
801 break;
802
803 case GTK_CURVE_TYPE_FREE:
804 if (c->point) {
805 rx = 0.0;
806 dx = c->num_points / (double) veclen;
807 for (x = 0; x < veclen; ++x, rx += dx)
808 vector[x] = unproject(RADIUS + c->height - c->point[(int) rx].y,
809 c->min_y, c->max_y, c->height);
810 } else
811 memset(vector, 0, veclen * sizeof(vector[0]));
812 break;
813 }
814 }
815 343
816 GtkWidget *xs_curve_new(void) 344 GtkWidget *xs_curve_new(void)
817 { 345 {
818 return gtk_type_new(xs_curve_get_type()); 346 return gtk_type_new(xs_curve_get_type());
819 } 347 }
348
820 349
821 static void xs_curve_finalize(GtkObject * object) 350 static void xs_curve_finalize(GtkObject * object)
822 { 351 {
823 XSCurve *curve; 352 XSCurve *curve;
824 353
833 if (curve->ctlpoint) 362 if (curve->ctlpoint)
834 g_free(curve->ctlpoint); 363 g_free(curve->ctlpoint);
835 364
836 (*GTK_OBJECT_CLASS(parent_class)->finalize) (object); 365 (*GTK_OBJECT_CLASS(parent_class)->finalize) (object);
837 } 366 }
367
368
369 void xs_curve_get_vector(XSCurve *curve, int veclen, gfloat vector[])
370 {
371 }
372
373 void xs_curve_set_vector(XSCurve *curve, int veclen, gfloat vector[])
374 {
375 }
376
377