1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 1997 David Mosberger
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.
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.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the Free
16 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include "gtkdrawingarea.h"
24 #include "gtkradiobutton.h"
25 #include "gtksignal.h"
28 #define BOUNDS(a,x,y) (((a) < (x)) ? (x) : (((a) > (y)) ? (y) : (a)))
29 #define RADIUS 3 /* radius of the control points */
30 #define MIN_DISTANCE 8 /* min distance between control points */
32 #define GRAPH_MASK (GDK_EXPOSURE_MASK | \
33 GDK_POINTER_MOTION_MASK | \
34 GDK_POINTER_MOTION_HINT_MASK | \
35 GDK_ENTER_NOTIFY_MASK | \
36 GDK_BUTTON_PRESS_MASK | \
37 GDK_BUTTON_RELEASE_MASK | \
38 GDK_BUTTON1_MOTION_MASK)
40 static GtkDrawingAreaClass *parent_class = NULL;
41 static gint curve_type_changed_signal = 0;
44 /* forward declarations: */
45 static void gtk_curve_class_init (GtkCurveClass *class);
46 static void gtk_curve_init (GtkCurve *curve);
47 static void gtk_curve_destroy (GtkObject *object);
51 gtk_curve_get_type (void)
53 static guint curve_type = 0;
57 GtkTypeInfo curve_info =
61 sizeof (GtkCurveClass),
62 (GtkClassInitFunc) gtk_curve_class_init,
63 (GtkObjectInitFunc) gtk_curve_init,
67 curve_type = gtk_type_unique (gtk_drawing_area_get_type (), &curve_info);
73 gtk_curve_class_init (GtkCurveClass *class)
75 GtkObjectClass *object_class;
77 parent_class = gtk_type_class (gtk_drawing_area_get_type ());
79 object_class = (GtkObjectClass *) class;
81 curve_type_changed_signal =
82 gtk_signal_new ("curve_type_changed", GTK_RUN_FIRST, object_class->type,
83 GTK_SIGNAL_OFFSET (GtkCurveClass, curve_type_changed),
84 gtk_signal_default_marshaller, GTK_TYPE_NONE, 0);
85 gtk_object_class_add_signals (object_class, &curve_type_changed_signal, 1);
87 object_class->destroy = gtk_curve_destroy;
91 gtk_curve_init (GtkCurve *curve)
93 curve->cursor_type = GDK_TOP_LEFT_ARROW;
95 curve->curve_type = GTK_CURVE_TYPE_SPLINE;
97 curve->grab_point = -1;
99 curve->num_points = 0;
102 curve->num_ctlpoints = 0;
103 curve->ctlpoint = NULL;
107 project (gfloat value, gfloat min, gfloat max, int norm)
109 return (norm - 1) * ((value - min) / (max - min)) + 0.5;
113 unproject (gint value, gfloat min, gfloat max, int norm)
115 return value / (gfloat) (norm - 1) * (max - min) + min;
118 /* Solve the tridiagonal equation system that determines the second
119 derivatives for the interpolation points. (Based on Numerical
120 Recipies 2nd Edition.) */
122 spline_solve (int n, gfloat x[], gfloat y[], gfloat y2[])
127 u = g_malloc ((n - 1) * sizeof (u[0]));
129 y2[0] = u[0] = 0.0; /* set lower boundary condition to "natural" */
131 for (i = 1; i < n - 1; ++i)
133 sig = (x[i] - x[i - 1]) / (x[i + 1] - x[i - 1]);
134 p = sig * y2[i - 1] + 2.0;
135 y2[i] = (sig - 1.0) / p;
136 u[i] = ((y[i + 1] - y[i])
137 / (x[i + 1] - x[i]) - (y[i] - y[i - 1]) / (x[i] - x[i - 1]));
138 u[i] = (6.0 * u[i] / (x[i + 1] - x[i - 1]) - sig * u[i - 1]) / p;
142 for (k = n - 2; k >= 0; --k)
143 y2[k] = y2[k] * y2[k + 1] + u[k];
149 spline_eval (int n, gfloat x[], gfloat y[], gfloat y2[], gfloat val)
154 /* do a binary search for the right interval: */
155 k_lo = 0; k_hi = n - 1;
156 while (k_hi - k_lo > 1)
158 k = (k_hi + k_lo) / 2;
165 h = x[k_hi] - x[k_lo];
168 a = (x[k_hi] - val) / h;
169 b = (val - x[k_lo]) / h;
170 return a*y[k_lo] + b*y[k_hi] +
171 ((a*a*a - a)*y2[k_lo] + (b*b*b - b)*y2[k_hi]) * (h*h)/6.0;
175 gtk_curve_interpolate (GtkCurve *c, gint width, gint height)
180 vector = g_malloc (width * sizeof (vector[0]));
182 gtk_curve_get_vector (c, width, vector);
185 if (c->num_points != width)
187 c->num_points = width;
190 c->point = g_malloc (c->num_points * sizeof (c->point[0]));
193 for (i = 0; i < width; ++i)
195 c->point[i].x = RADIUS + i;
196 c->point[i].y = RADIUS + height
197 - project (vector[i], c->min_y, c->max_y, height);
202 gtk_curve_draw (GtkCurve *c, gint width, gint height)
211 if (c->height != height || c->num_points != width)
212 gtk_curve_interpolate (c, width, height);
214 state = GTK_STATE_NORMAL;
215 if (!GTK_WIDGET_IS_SENSITIVE (GTK_WIDGET (c)))
216 state = GTK_STATE_INSENSITIVE;
218 style = GTK_WIDGET (c)->style;
220 /* clear the pixmap: */
221 gdk_draw_rectangle (c->pixmap, style->bg_gc[state], TRUE,
222 0, 0, width + RADIUS * 2, height + RADIUS * 2);
224 /* draw the grid lines: (XXX make more meaningful) */
225 for (i = 0; i < 5; i++)
227 gdk_draw_line (c->pixmap, style->dark_gc[state],
228 RADIUS, i * (height / 4.0) + RADIUS,
229 width + RADIUS, i * (height / 4.0) + RADIUS);
230 gdk_draw_line (c->pixmap, style->dark_gc[state],
231 i * (width / 4.0) + RADIUS, RADIUS,
232 i * (width / 4.0) + RADIUS, height + RADIUS);
235 gdk_draw_points (c->pixmap, style->fg_gc[state], c->point, c->num_points);
236 if (c->curve_type != GTK_CURVE_TYPE_FREE)
237 for (i = 0; i < c->num_ctlpoints; ++i)
241 if (c->ctlpoint[i][0] < c->min_x)
244 x = project (c->ctlpoint[i][0], c->min_x, c->max_x,
247 project (c->ctlpoint[i][1], c->min_y, c->max_y,
251 gdk_draw_arc (c->pixmap, style->fg_gc[state], TRUE, x, y,
252 RADIUS * 2, RADIUS*2, 0, 360*64);
254 gdk_draw_pixmap (GTK_WIDGET (c)->window, style->fg_gc[state], c->pixmap,
255 0, 0, 0, 0, width + RADIUS * 2, height + RADIUS * 2);
259 gtk_curve_graph_events (GtkWidget *widget, GdkEvent *event, GtkCurve *c)
261 GdkCursorType new_type = c->cursor_type;
262 gint i, src, dst, leftbound, rightbound;
263 GdkEventButton *bevent;
264 GdkEventMotion *mevent;
267 gint cx, x, y, width, height;
268 gint closest_point = 0;
269 gfloat rx, ry, min_x;
274 width = w->allocation.width - RADIUS * 2;
275 height = w->allocation.height - RADIUS * 2;
277 /* get the pointer position */
278 gdk_window_get_pointer (w->window, &tx, &ty, NULL);
279 x = BOUNDS ((tx - RADIUS), 0, width);
280 y = BOUNDS ((ty - RADIUS), 0, height);
285 for (i = 0; i < c->num_ctlpoints; ++i)
287 cx = project (c->ctlpoint[i][0], min_x, c->max_x, width);
288 if ((guint) abs (x - cx) < distance)
290 distance = abs (x - cx);
299 gdk_pixmap_destroy (c->pixmap);
304 c->pixmap = gdk_pixmap_new (w->window,
306 w->allocation.height, -1);
307 gtk_curve_draw (c, width, height);
310 case GDK_BUTTON_PRESS:
311 gtk_grab_add (widget);
313 bevent = (GdkEventButton *) event;
314 new_type = GDK_TCROSS;
316 switch (c->curve_type)
318 case GTK_CURVE_TYPE_LINEAR:
319 case GTK_CURVE_TYPE_SPLINE:
320 if (distance > MIN_DISTANCE)
322 /* insert a new control point */
323 if (c->num_ctlpoints > 0)
325 cx = project (c->ctlpoint[closest_point][0], min_x,
332 g_realloc (c->ctlpoint,
333 c->num_ctlpoints * sizeof (*c->ctlpoint));
334 for (i = c->num_ctlpoints - 1; i > closest_point; --i)
335 memcpy (c->ctlpoint + i, c->ctlpoint + i - 1,
336 sizeof (*c->ctlpoint));
338 c->grab_point = closest_point;
339 c->ctlpoint[c->grab_point][0] =
340 unproject (x, min_x, c->max_x, width);
341 c->ctlpoint[c->grab_point][1] =
342 unproject (height - y, c->min_y, c->max_y, height);
344 gtk_curve_interpolate (c, width, height);
347 case GTK_CURVE_TYPE_FREE:
348 c->point[x].x = RADIUS + x;
349 c->point[x].y = RADIUS + y;
354 gtk_curve_draw (c, width, height);
357 case GDK_BUTTON_RELEASE:
358 gtk_grab_remove (widget);
360 /* delete inactive points: */
361 if (c->curve_type != GTK_CURVE_TYPE_FREE)
363 for (src = dst = 0; src < c->num_ctlpoints; ++src)
365 if (c->ctlpoint[src][0] >= min_x)
367 memcpy (c->ctlpoint + dst, c->ctlpoint + src,
368 sizeof (*c->ctlpoint));
374 c->num_ctlpoints -= (src - dst);
375 if (c->num_ctlpoints <= 0)
377 c->num_ctlpoints = 1;
378 c->ctlpoint[0][0] = min_x;
379 c->ctlpoint[0][1] = c->min_y;
380 gtk_curve_interpolate (c, width, height);
381 gtk_curve_draw (c, width, height);
384 g_realloc (c->ctlpoint,
385 c->num_ctlpoints * sizeof (*c->ctlpoint));
388 new_type = GDK_FLEUR;
392 case GDK_MOTION_NOTIFY:
393 mevent = (GdkEventMotion *) event;
399 switch (c->curve_type)
401 case GTK_CURVE_TYPE_LINEAR:
402 case GTK_CURVE_TYPE_SPLINE:
403 if (c->grab_point == -1)
405 /* if no point is grabbed... */
406 if (distance <= MIN_DISTANCE)
407 new_type = GDK_FLEUR;
409 new_type = GDK_TCROSS;
413 /* drag the grabbed point */
414 new_type = GDK_TCROSS;
416 leftbound = -MIN_DISTANCE;
417 if (c->grab_point > 0)
418 leftbound = project (c->ctlpoint[c->grab_point - 1][0],
419 min_x, c->max_x, width);
421 rightbound = width + RADIUS * 2 + MIN_DISTANCE;
422 if (c->grab_point + 1 < c->num_ctlpoints)
423 rightbound = project (c->ctlpoint[c->grab_point + 1][0],
424 min_x, c->max_x, width);
426 if (tx <= leftbound || tx >= rightbound
427 || ty > height + RADIUS * 2 + MIN_DISTANCE
428 || ty < -MIN_DISTANCE)
429 c->ctlpoint[c->grab_point][0] = min_x - 1.0;
432 rx = unproject (x, min_x, c->max_x, width);
433 ry = unproject (height - y, c->min_y, c->max_y, height);
434 c->ctlpoint[c->grab_point][0] = rx;
435 c->ctlpoint[c->grab_point][1] = ry;
437 gtk_curve_interpolate (c, width, height);
438 gtk_curve_draw (c, width, height);
442 case GTK_CURVE_TYPE_FREE:
443 if (c->grab_point != -1)
445 if (c->grab_point > x)
461 for (i = x1; i <= x2; i++)
463 c->point[i].x = RADIUS + i;
464 c->point[i].y = RADIUS +
465 (y1 + ((y2 - y1) * (i - x1)) / (x2 - x1));
469 c->point[x].x = RADIUS + x;
470 c->point[x].y = RADIUS + y;
474 gtk_curve_draw (c, width, height);
476 if (mevent->state & GDK_BUTTON1_MASK)
477 new_type = GDK_TCROSS;
479 new_type = GDK_PENCIL;
482 if (new_type != (GdkCursorType) c->cursor_type)
486 c->cursor_type = new_type;
488 cursor = gdk_cursor_new (c->cursor_type);
489 gdk_window_set_cursor (w->window, cursor);
490 gdk_cursor_destroy (cursor);
501 gtk_curve_set_curve_type (GtkCurve *c, GtkCurveType new_type)
506 if (new_type != c->curve_type)
510 width = GTK_WIDGET(c)->allocation.width - RADIUS * 2;
511 height = GTK_WIDGET(c)->allocation.height - RADIUS * 2;
513 if (new_type == GTK_CURVE_TYPE_FREE)
515 gtk_curve_interpolate (c, width, height);
516 c->curve_type = new_type;
518 else if (c->curve_type == GTK_CURVE_TYPE_FREE)
521 g_free (c->ctlpoint);
522 c->num_ctlpoints = 9;
523 c->ctlpoint = g_malloc (c->num_ctlpoints * sizeof (*c->ctlpoint));
526 dx = (width - 1) / (gfloat) (c->num_ctlpoints - 1);
528 for (i = 0; i < c->num_ctlpoints; ++i, rx += dx)
530 x = (int) (rx + 0.5);
532 unproject (x, c->min_x, c->max_x, width);
534 unproject (RADIUS + height - c->point[x].y,
535 c->min_y, c->max_y, height);
537 c->curve_type = new_type;
538 gtk_curve_interpolate (c, width, height);
542 c->curve_type = new_type;
543 gtk_curve_interpolate (c, width, height);
545 gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
546 gtk_curve_draw (c, width, height);
551 gtk_curve_size_graph (GtkCurve *curve)
556 width = (curve->max_x - curve->min_x) + 1;
557 height = (curve->max_y - curve->min_y) + 1;
558 aspect = width / (gfloat) height;
559 if (width > gdk_screen_width () / 4)
560 width = gdk_screen_width () / 4;
561 if (height > gdk_screen_height () / 4)
562 height = gdk_screen_height () / 4;
565 width = height * aspect;
567 height = width / aspect;
569 gtk_drawing_area_size (GTK_DRAWING_AREA (curve),
570 width + RADIUS * 2, height + RADIUS * 2);
574 gtk_curve_reset_vector (GtkCurve *curve)
577 g_free (curve->ctlpoint);
579 curve->num_ctlpoints = 2;
580 curve->ctlpoint = g_malloc (2 * sizeof (curve->ctlpoint[0]));
581 curve->ctlpoint[0][0] = curve->min_x;
582 curve->ctlpoint[0][1] = curve->min_y;
583 curve->ctlpoint[1][0] = curve->max_x;
584 curve->ctlpoint[1][1] = curve->max_y;
590 width = GTK_WIDGET (curve)->allocation.width - RADIUS * 2;
591 height = GTK_WIDGET (curve)->allocation.height - RADIUS * 2;
593 if (curve->curve_type == GTK_CURVE_TYPE_FREE)
595 curve->curve_type = GTK_CURVE_TYPE_LINEAR;
596 gtk_curve_interpolate (curve, width, height);
597 curve->curve_type = GTK_CURVE_TYPE_FREE;
600 gtk_curve_interpolate (curve, width, height);
601 gtk_curve_draw (curve, width, height);
606 gtk_curve_reset (GtkCurve *c)
608 GtkCurveType old_type;
610 old_type = c->curve_type;
611 c->curve_type = GTK_CURVE_TYPE_SPLINE;
612 gtk_curve_reset_vector (c);
614 if (old_type != GTK_CURVE_TYPE_SPLINE)
615 gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
619 gtk_curve_set_gamma (GtkCurve *c, gfloat gamma)
621 gfloat x, one_over_gamma, height, one_over_width;
622 GtkCurveType old_type;
625 if (c->num_points < 2)
628 old_type = c->curve_type;
629 c->curve_type = GTK_CURVE_TYPE_FREE;
632 one_over_gamma = 1.0;
634 one_over_gamma = 1.0 / gamma;
635 one_over_width = 1.0 / (c->num_points - 1);
637 for (i = 0; i < c->num_points; ++i)
639 x = (gfloat) i / (c->num_points - 1);
640 c->point[i].x = RADIUS + i;
642 RADIUS + (height * (1.0 - pow (x, one_over_gamma)) + 0.5);
645 if (old_type != GTK_CURVE_TYPE_FREE)
646 gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
648 gtk_curve_draw (c, c->num_points, c->height);
652 gtk_curve_set_range (GtkCurve *curve,
653 gfloat min_x, gfloat max_x, gfloat min_y, gfloat max_y)
655 curve->min_x = min_x;
656 curve->max_x = max_x;
657 curve->min_y = min_y;
658 curve->max_y = max_y;
660 gtk_curve_size_graph (curve);
661 gtk_curve_reset_vector (curve);
665 gtk_curve_set_vector (GtkCurve *c, int veclen, gfloat vector[])
667 GtkCurveType old_type;
671 old_type = c->curve_type;
672 c->curve_type = GTK_CURVE_TYPE_FREE;
675 height = GTK_WIDGET (c)->allocation.height - RADIUS * 2;
678 height = (c->max_y - c->min_y);
679 if (height > gdk_screen_height () / 4)
680 height = gdk_screen_height () / 4;
683 c->num_points = veclen;
684 c->point = g_malloc (c->num_points * sizeof (c->point[0]));
687 dx = (veclen - 1.0) / (c->num_points - 1.0);
689 for (i = 0; i < c->num_points; ++i, rx += dx)
691 ry = vector[(int) (rx + 0.5)];
692 if (ry > c->max_y) ry = c->max_y;
693 if (ry < c->min_y) ry = c->min_y;
694 c->point[i].x = RADIUS + i;
696 RADIUS + height - project (ry, c->min_y, c->max_y, height);
698 if (old_type != GTK_CURVE_TYPE_FREE)
699 gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
701 gtk_curve_draw (c, c->num_points, height);
705 gtk_curve_get_vector (GtkCurve *c, int veclen, gfloat vector[])
707 gfloat rx, ry, dx, dy, min_x, delta_x, *mem, *xv, *yv, *y2v, prev;
708 gint dst, i, x, next, num_active_ctlpoints = 0, first_active = -1;
712 if (c->curve_type != GTK_CURVE_TYPE_FREE)
714 /* count active points: */
716 for (i = num_active_ctlpoints = 0; i < c->num_ctlpoints; ++i)
717 if (c->ctlpoint[i][0] > prev)
719 if (first_active < 0)
721 prev = c->ctlpoint[i][0];
722 ++num_active_ctlpoints;
725 /* handle degenerate case: */
726 if (num_active_ctlpoints < 2)
728 if (num_active_ctlpoints > 0)
729 ry = c->ctlpoint[first_active][1];
732 if (ry < c->min_y) ry = c->min_y;
733 if (ry > c->max_y) ry = c->max_y;
734 for (x = 0; x < veclen; ++x)
740 switch (c->curve_type)
742 case GTK_CURVE_TYPE_SPLINE:
743 mem = g_malloc (3 * num_active_ctlpoints * sizeof (gfloat));
745 yv = mem + num_active_ctlpoints;
746 y2v = mem + 2*num_active_ctlpoints;
749 for (i = dst = 0; i < c->num_ctlpoints; ++i)
750 if (c->ctlpoint[i][0] > prev)
752 prev = c->ctlpoint[i][0];
753 xv[dst] = c->ctlpoint[i][0];
754 yv[dst] = c->ctlpoint[i][1];
758 spline_solve (num_active_ctlpoints, xv, yv, y2v);
761 dx = (c->max_x - min_x) / (veclen - 1);
762 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) ry = c->min_y;
766 if (ry > c->max_y) ry = c->max_y;
773 case GTK_CURVE_TYPE_LINEAR:
774 dx = (c->max_x - min_x) / (veclen - 1);
779 for (x = 0; x < veclen; ++x, rx += dx)
781 if (rx >= c->ctlpoint[i][0])
783 if (rx > c->ctlpoint[i][0])
787 while (next < c->num_ctlpoints
788 && c->ctlpoint[next][0] <= c->ctlpoint[i][0])
790 if (next < c->num_ctlpoints)
792 delta_x = c->ctlpoint[next][0] - c->ctlpoint[i][0];
793 dy = ((c->ctlpoint[next][1] - c->ctlpoint[i][1])
796 ry = c->ctlpoint[i][1];
805 case GTK_CURVE_TYPE_FREE:
809 dx = c->num_points / (double) veclen;
810 for (x = 0; x < veclen; ++x, rx += dx)
811 vector[x] = unproject (RADIUS + c->height - c->point[(int) rx].y,
816 memset (vector, 0, veclen * sizeof (vector[0]));
827 curve = gtk_type_new (gtk_curve_get_type ());
833 old_mask = gtk_widget_get_events (GTK_WIDGET (curve));
834 gtk_widget_set_events (GTK_WIDGET (curve), old_mask | GRAPH_MASK);
835 gtk_signal_connect (GTK_OBJECT (curve), "event",
836 (GtkSignalFunc) gtk_curve_graph_events, curve);
837 gtk_curve_size_graph (curve);
839 return GTK_WIDGET (curve);
843 gtk_curve_destroy (GtkObject *object)
847 g_return_if_fail (object != NULL);
848 g_return_if_fail (GTK_IS_CURVE (object));
850 curve = GTK_CURVE (object);
852 gdk_pixmap_destroy (curve->pixmap);
854 g_free (curve->point);
856 g_free (curve->ctlpoint);
858 if (GTK_OBJECT_CLASS (parent_class)->destroy)
859 (*GTK_OBJECT_CLASS (parent_class)->destroy) (object);