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 Lesser 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 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser 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.
21 * Modified by the GTK+ Team and others 1997-2000. 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/.
32 #include "gtkdrawingarea.h"
34 #include "gtkmarshalers.h"
35 #include "gtkradiobutton.h"
36 #include "gtksignal.h"
40 #define RADIUS 3 /* radius of the control points */
41 #define MIN_DISTANCE 8 /* min distance between control points */
43 #define GRAPH_MASK (GDK_EXPOSURE_MASK | \
44 GDK_POINTER_MOTION_MASK | \
45 GDK_POINTER_MOTION_HINT_MASK | \
46 GDK_ENTER_NOTIFY_MASK | \
47 GDK_BUTTON_PRESS_MASK | \
48 GDK_BUTTON_RELEASE_MASK | \
49 GDK_BUTTON1_MOTION_MASK)
60 static GtkDrawingAreaClass *parent_class = NULL;
61 static guint curve_type_changed_signal = 0;
64 /* forward declarations: */
65 static void gtk_curve_class_init (GtkCurveClass *class);
66 static void gtk_curve_init (GtkCurve *curve);
67 static void gtk_curve_get_property (GObject *object,
71 static void gtk_curve_set_property (GObject *object,
75 static void gtk_curve_finalize (GObject *object);
76 static gint gtk_curve_graph_events (GtkWidget *widget,
79 static void gtk_curve_size_graph (GtkCurve *curve);
82 gtk_curve_get_type (void)
84 static GtkType curve_type = 0;
88 static const GtkTypeInfo curve_info =
92 sizeof (GtkCurveClass),
93 (GtkClassInitFunc) gtk_curve_class_init,
94 (GtkObjectInitFunc) gtk_curve_init,
95 /* reserved_1 */ NULL,
96 /* reserved_2 */ NULL,
97 (GtkClassInitFunc) NULL,
100 curve_type = gtk_type_unique (GTK_TYPE_DRAWING_AREA, &curve_info);
106 gtk_curve_class_init (GtkCurveClass *class)
108 GObjectClass *gobject_class = G_OBJECT_CLASS (class);
109 GtkObjectClass *object_class = GTK_OBJECT_CLASS (class);
111 parent_class = gtk_type_class (GTK_TYPE_DRAWING_AREA);
113 gobject_class->finalize = gtk_curve_finalize;
115 gobject_class->set_property = gtk_curve_set_property;
116 gobject_class->get_property = gtk_curve_get_property;
118 g_object_class_install_property (gobject_class,
120 g_param_spec_enum ("curve_type",
122 _("Is this curve linear, spline interpolated, or free-form"),
124 GTK_CURVE_TYPE_LINEAR,
127 g_object_class_install_property (gobject_class,
129 g_param_spec_float ("min_x",
131 _("Minimum possible value for X"),
137 g_object_class_install_property (gobject_class,
139 g_param_spec_float ("max_x",
141 _("Maximum possible X value."),
147 g_object_class_install_property (gobject_class,
149 g_param_spec_float ("min_y",
151 _("Minimum possible value for Y"),
157 g_object_class_install_property (gobject_class,
159 g_param_spec_float ("max_y",
161 _("Maximum possible value for Y"),
168 curve_type_changed_signal =
169 gtk_signal_new ("curve_type_changed", GTK_RUN_FIRST, GTK_CLASS_TYPE (object_class),
170 GTK_SIGNAL_OFFSET (GtkCurveClass, curve_type_changed),
171 _gtk_marshal_VOID__VOID, GTK_TYPE_NONE, 0);
175 gtk_curve_init (GtkCurve *curve)
179 curve->cursor_type = GDK_TOP_LEFT_ARROW;
180 curve->pixmap = NULL;
181 curve->curve_type = GTK_CURVE_TYPE_SPLINE;
183 curve->grab_point = -1;
185 curve->num_points = 0;
188 curve->num_ctlpoints = 0;
189 curve->ctlpoint = NULL;
196 old_mask = gtk_widget_get_events (GTK_WIDGET (curve));
197 gtk_widget_set_events (GTK_WIDGET (curve), old_mask | GRAPH_MASK);
198 gtk_signal_connect (GTK_OBJECT (curve), "event",
199 (GtkSignalFunc) gtk_curve_graph_events, curve);
200 gtk_curve_size_graph (curve);
204 gtk_curve_set_property (GObject *object,
209 GtkCurve *curve = GTK_CURVE (object);
213 case PROP_CURVE_TYPE:
214 gtk_curve_set_curve_type (curve, g_value_get_enum (value));
217 gtk_curve_set_range (curve, g_value_get_float (value), curve->max_x,
218 curve->min_y, curve->max_y);
221 gtk_curve_set_range (curve, curve->min_x, g_value_get_float (value),
222 curve->min_y, curve->max_y);
225 gtk_curve_set_range (curve, curve->min_x, curve->max_x,
226 g_value_get_float (value), curve->max_y);
229 gtk_curve_set_range (curve, curve->min_x, curve->max_x,
230 curve->min_y, g_value_get_float (value));
233 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
239 gtk_curve_get_property (GObject *object,
244 GtkCurve *curve = GTK_CURVE (object);
248 case PROP_CURVE_TYPE:
249 g_value_set_enum (value, curve->curve_type);
252 g_value_set_float (value, curve->min_x);
255 g_value_set_float (value, curve->max_x);
258 g_value_set_float (value, curve->min_y);
261 g_value_set_float (value, curve->max_y);
264 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
270 project (gfloat value, gfloat min, gfloat max, int norm)
272 return (norm - 1) * ((value - min) / (max - min)) + 0.5;
276 unproject (gint value, gfloat min, gfloat max, int norm)
278 return value / (gfloat) (norm - 1) * (max - min) + min;
281 /* Solve the tridiagonal equation system that determines the second
282 derivatives for the interpolation points. (Based on Numerical
283 Recipies 2nd Edition.) */
285 spline_solve (int n, gfloat x[], gfloat y[], gfloat y2[])
290 u = g_malloc ((n - 1) * sizeof (u[0]));
292 y2[0] = u[0] = 0.0; /* set lower boundary condition to "natural" */
294 for (i = 1; i < n - 1; ++i)
296 sig = (x[i] - x[i - 1]) / (x[i + 1] - x[i - 1]);
297 p = sig * y2[i - 1] + 2.0;
298 y2[i] = (sig - 1.0) / p;
299 u[i] = ((y[i + 1] - y[i])
300 / (x[i + 1] - x[i]) - (y[i] - y[i - 1]) / (x[i] - x[i - 1]));
301 u[i] = (6.0 * u[i] / (x[i + 1] - x[i - 1]) - sig * u[i - 1]) / p;
305 for (k = n - 2; k >= 0; --k)
306 y2[k] = y2[k] * y2[k + 1] + u[k];
312 spline_eval (int n, gfloat x[], gfloat y[], gfloat y2[], gfloat val)
317 /* do a binary search for the right interval: */
318 k_lo = 0; k_hi = n - 1;
319 while (k_hi - k_lo > 1)
321 k = (k_hi + k_lo) / 2;
328 h = x[k_hi] - x[k_lo];
331 a = (x[k_hi] - val) / h;
332 b = (val - x[k_lo]) / h;
333 return a*y[k_lo] + b*y[k_hi] +
334 ((a*a*a - a)*y2[k_lo] + (b*b*b - b)*y2[k_hi]) * (h*h)/6.0;
338 gtk_curve_interpolate (GtkCurve *c, gint width, gint height)
343 vector = g_malloc (width * sizeof (vector[0]));
345 gtk_curve_get_vector (c, width, vector);
348 if (c->num_points != width)
350 c->num_points = width;
353 c->point = g_malloc (c->num_points * sizeof (c->point[0]));
356 for (i = 0; i < width; ++i)
358 c->point[i].x = RADIUS + i;
359 c->point[i].y = RADIUS + height
360 - project (vector[i], c->min_y, c->max_y, height);
367 gtk_curve_draw (GtkCurve *c, gint width, gint height)
376 if (c->height != height || c->num_points != width)
377 gtk_curve_interpolate (c, width, height);
379 state = GTK_STATE_NORMAL;
380 if (!GTK_WIDGET_IS_SENSITIVE (GTK_WIDGET (c)))
381 state = GTK_STATE_INSENSITIVE;
383 style = GTK_WIDGET (c)->style;
385 /* clear the pixmap: */
386 gtk_paint_flat_box (style, c->pixmap, GTK_STATE_NORMAL, GTK_SHADOW_NONE,
387 NULL, GTK_WIDGET (c), "curve_bg",
388 0, 0, width + RADIUS * 2, height + RADIUS * 2);
389 /* draw the grid lines: (XXX make more meaningful) */
390 for (i = 0; i < 5; i++)
392 gdk_draw_line (c->pixmap, style->dark_gc[state],
393 RADIUS, i * (height / 4.0) + RADIUS,
394 width + RADIUS, i * (height / 4.0) + RADIUS);
395 gdk_draw_line (c->pixmap, style->dark_gc[state],
396 i * (width / 4.0) + RADIUS, RADIUS,
397 i * (width / 4.0) + RADIUS, height + RADIUS);
400 gdk_draw_points (c->pixmap, style->fg_gc[state], c->point, c->num_points);
401 if (c->curve_type != GTK_CURVE_TYPE_FREE)
402 for (i = 0; i < c->num_ctlpoints; ++i)
406 if (c->ctlpoint[i][0] < c->min_x)
409 x = project (c->ctlpoint[i][0], c->min_x, c->max_x,
412 project (c->ctlpoint[i][1], c->min_y, c->max_y,
416 gdk_draw_arc (c->pixmap, style->fg_gc[state], TRUE, x, y,
417 RADIUS * 2, RADIUS*2, 0, 360*64);
419 gdk_draw_pixmap (GTK_WIDGET (c)->window, style->fg_gc[state], c->pixmap,
420 0, 0, 0, 0, width + RADIUS * 2, height + RADIUS * 2);
424 gtk_curve_graph_events (GtkWidget *widget, GdkEvent *event, GtkCurve *c)
426 GdkCursorType new_type = c->cursor_type;
427 gint i, src, dst, leftbound, rightbound;
428 GdkEventButton *bevent;
429 GdkEventMotion *mevent;
432 gint cx, x, y, width, height;
433 gint closest_point = 0;
434 gfloat rx, ry, min_x;
440 width = w->allocation.width - RADIUS * 2;
441 height = w->allocation.height - RADIUS * 2;
443 if ((width < 0) || (height < 0))
446 /* get the pointer position */
447 gdk_window_get_pointer (w->window, &tx, &ty, NULL);
448 x = CLAMP ((tx - RADIUS), 0, width-1);
449 y = CLAMP ((ty - RADIUS), 0, height-1);
454 for (i = 0; i < c->num_ctlpoints; ++i)
456 cx = project (c->ctlpoint[i][0], min_x, c->max_x, width);
457 if ((guint) abs (x - cx) < distance)
459 distance = abs (x - cx);
468 gdk_pixmap_unref (c->pixmap);
473 c->pixmap = gdk_pixmap_new (w->window,
475 w->allocation.height, -1);
476 gtk_curve_draw (c, width, height);
479 case GDK_BUTTON_PRESS:
480 gtk_grab_add (widget);
482 bevent = (GdkEventButton *) event;
483 new_type = GDK_TCROSS;
485 switch (c->curve_type)
487 case GTK_CURVE_TYPE_LINEAR:
488 case GTK_CURVE_TYPE_SPLINE:
489 if (distance > MIN_DISTANCE)
491 /* insert a new control point */
492 if (c->num_ctlpoints > 0)
494 cx = project (c->ctlpoint[closest_point][0], min_x,
501 g_realloc (c->ctlpoint,
502 c->num_ctlpoints * sizeof (*c->ctlpoint));
503 for (i = c->num_ctlpoints - 1; i > closest_point; --i)
504 memcpy (c->ctlpoint + i, c->ctlpoint + i - 1,
505 sizeof (*c->ctlpoint));
507 c->grab_point = closest_point;
508 c->ctlpoint[c->grab_point][0] =
509 unproject (x, min_x, c->max_x, width);
510 c->ctlpoint[c->grab_point][1] =
511 unproject (height - y, c->min_y, c->max_y, height);
513 gtk_curve_interpolate (c, width, height);
516 case GTK_CURVE_TYPE_FREE:
517 c->point[x].x = RADIUS + x;
518 c->point[x].y = RADIUS + y;
523 gtk_curve_draw (c, width, height);
527 case GDK_BUTTON_RELEASE:
528 gtk_grab_remove (widget);
530 /* delete inactive points: */
531 if (c->curve_type != GTK_CURVE_TYPE_FREE)
533 for (src = dst = 0; src < c->num_ctlpoints; ++src)
535 if (c->ctlpoint[src][0] >= min_x)
537 memcpy (c->ctlpoint + dst, c->ctlpoint + src,
538 sizeof (*c->ctlpoint));
544 c->num_ctlpoints -= (src - dst);
545 if (c->num_ctlpoints <= 0)
547 c->num_ctlpoints = 1;
548 c->ctlpoint[0][0] = min_x;
549 c->ctlpoint[0][1] = c->min_y;
550 gtk_curve_interpolate (c, width, height);
551 gtk_curve_draw (c, width, height);
554 g_realloc (c->ctlpoint,
555 c->num_ctlpoints * sizeof (*c->ctlpoint));
558 new_type = GDK_FLEUR;
563 case GDK_MOTION_NOTIFY:
564 mevent = (GdkEventMotion *) event;
566 switch (c->curve_type)
568 case GTK_CURVE_TYPE_LINEAR:
569 case GTK_CURVE_TYPE_SPLINE:
570 if (c->grab_point == -1)
572 /* if no point is grabbed... */
573 if (distance <= MIN_DISTANCE)
574 new_type = GDK_FLEUR;
576 new_type = GDK_TCROSS;
580 /* drag the grabbed point */
581 new_type = GDK_TCROSS;
583 leftbound = -MIN_DISTANCE;
584 if (c->grab_point > 0)
585 leftbound = project (c->ctlpoint[c->grab_point - 1][0],
586 min_x, c->max_x, width);
588 rightbound = width + RADIUS * 2 + MIN_DISTANCE;
589 if (c->grab_point + 1 < c->num_ctlpoints)
590 rightbound = project (c->ctlpoint[c->grab_point + 1][0],
591 min_x, c->max_x, width);
593 if (tx <= leftbound || tx >= rightbound
594 || ty > height + RADIUS * 2 + MIN_DISTANCE
595 || ty < -MIN_DISTANCE)
596 c->ctlpoint[c->grab_point][0] = min_x - 1.0;
599 rx = unproject (x, min_x, c->max_x, width);
600 ry = unproject (height - y, c->min_y, c->max_y, height);
601 c->ctlpoint[c->grab_point][0] = rx;
602 c->ctlpoint[c->grab_point][1] = ry;
604 gtk_curve_interpolate (c, width, height);
605 gtk_curve_draw (c, width, height);
609 case GTK_CURVE_TYPE_FREE:
610 if (c->grab_point != -1)
612 if (c->grab_point > x)
628 for (i = x1; i <= x2; i++)
630 c->point[i].x = RADIUS + i;
631 c->point[i].y = RADIUS +
632 (y1 + ((y2 - y1) * (i - x1)) / (x2 - x1));
636 c->point[x].x = RADIUS + x;
637 c->point[x].y = RADIUS + y;
641 gtk_curve_draw (c, width, height);
643 if (mevent->state & GDK_BUTTON1_MASK)
644 new_type = GDK_TCROSS;
646 new_type = GDK_PENCIL;
649 if (new_type != (GdkCursorType) c->cursor_type)
653 c->cursor_type = new_type;
655 cursor = gdk_cursor_new (c->cursor_type);
656 gdk_window_set_cursor (w->window, cursor);
657 gdk_cursor_destroy (cursor);
670 gtk_curve_set_curve_type (GtkCurve *c, GtkCurveType new_type)
675 if (new_type != c->curve_type)
679 width = GTK_WIDGET (c)->allocation.width - RADIUS * 2;
680 height = GTK_WIDGET (c)->allocation.height - RADIUS * 2;
682 if (new_type == GTK_CURVE_TYPE_FREE)
684 gtk_curve_interpolate (c, width, height);
685 c->curve_type = new_type;
687 else if (c->curve_type == GTK_CURVE_TYPE_FREE)
690 g_free (c->ctlpoint);
691 c->num_ctlpoints = 9;
692 c->ctlpoint = g_malloc (c->num_ctlpoints * sizeof (*c->ctlpoint));
695 dx = (width - 1) / (gfloat) (c->num_ctlpoints - 1);
697 for (i = 0; i < c->num_ctlpoints; ++i, rx += dx)
699 x = (int) (rx + 0.5);
701 unproject (x, c->min_x, c->max_x, width);
703 unproject (RADIUS + height - c->point[x].y,
704 c->min_y, c->max_y, height);
706 c->curve_type = new_type;
707 gtk_curve_interpolate (c, width, height);
711 c->curve_type = new_type;
712 gtk_curve_interpolate (c, width, height);
714 gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
715 g_object_notify (G_OBJECT (c), "curve_type");
716 gtk_curve_draw (c, width, height);
721 gtk_curve_size_graph (GtkCurve *curve)
726 width = (curve->max_x - curve->min_x) + 1;
727 height = (curve->max_y - curve->min_y) + 1;
728 aspect = width / (gfloat) height;
729 if (width > gdk_screen_width () / 4)
730 width = gdk_screen_width () / 4;
731 if (height > gdk_screen_height () / 4)
732 height = gdk_screen_height () / 4;
735 width = height * aspect;
737 height = width / aspect;
739 gtk_drawing_area_size (GTK_DRAWING_AREA (curve),
740 width + RADIUS * 2, height + RADIUS * 2);
744 gtk_curve_reset_vector (GtkCurve *curve)
747 g_free (curve->ctlpoint);
749 curve->num_ctlpoints = 2;
750 curve->ctlpoint = g_malloc (2 * sizeof (curve->ctlpoint[0]));
751 curve->ctlpoint[0][0] = curve->min_x;
752 curve->ctlpoint[0][1] = curve->min_y;
753 curve->ctlpoint[1][0] = curve->max_x;
754 curve->ctlpoint[1][1] = curve->max_y;
760 width = GTK_WIDGET (curve)->allocation.width - RADIUS * 2;
761 height = GTK_WIDGET (curve)->allocation.height - RADIUS * 2;
763 if (curve->curve_type == GTK_CURVE_TYPE_FREE)
765 curve->curve_type = GTK_CURVE_TYPE_LINEAR;
766 gtk_curve_interpolate (curve, width, height);
767 curve->curve_type = GTK_CURVE_TYPE_FREE;
770 gtk_curve_interpolate (curve, width, height);
771 gtk_curve_draw (curve, width, height);
776 gtk_curve_reset (GtkCurve *c)
778 GtkCurveType old_type;
780 old_type = c->curve_type;
781 c->curve_type = GTK_CURVE_TYPE_SPLINE;
782 gtk_curve_reset_vector (c);
784 if (old_type != GTK_CURVE_TYPE_SPLINE)
786 gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
787 g_object_notify (G_OBJECT (c), "curve_type");
792 gtk_curve_set_gamma (GtkCurve *c, gfloat gamma)
794 gfloat x, one_over_gamma, height, one_over_width;
795 GtkCurveType old_type;
798 if (c->num_points < 2)
801 old_type = c->curve_type;
802 c->curve_type = GTK_CURVE_TYPE_FREE;
805 one_over_gamma = 1.0;
807 one_over_gamma = 1.0 / gamma;
808 one_over_width = 1.0 / (c->num_points - 1);
810 for (i = 0; i < c->num_points; ++i)
812 x = (gfloat) i / (c->num_points - 1);
813 c->point[i].x = RADIUS + i;
815 RADIUS + (height * (1.0 - pow (x, one_over_gamma)) + 0.5);
818 if (old_type != GTK_CURVE_TYPE_FREE)
819 gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
821 gtk_curve_draw (c, c->num_points, c->height);
825 gtk_curve_set_range (GtkCurve *curve,
831 g_object_freeze_notify (G_OBJECT (curve));
832 if (curve->min_x != min_x) {
833 curve->min_x = min_x;
834 g_object_notify (G_OBJECT (curve), "min_x");
836 if (curve->max_x != max_x) {
837 curve->max_x = max_x;
838 g_object_notify (G_OBJECT (curve), "max_x");
840 if (curve->min_y != min_y) {
841 curve->min_y = min_y;
842 g_object_notify (G_OBJECT (curve), "min_y");
844 if (curve->max_y != max_y) {
845 curve->max_y = max_y;
846 g_object_notify (G_OBJECT (curve), "max_y");
848 g_object_thaw_notify (G_OBJECT (curve));
850 gtk_curve_size_graph (curve);
851 gtk_curve_reset_vector (curve);
855 gtk_curve_set_vector (GtkCurve *c, int veclen, gfloat vector[])
857 GtkCurveType old_type;
861 old_type = c->curve_type;
862 c->curve_type = GTK_CURVE_TYPE_FREE;
865 height = GTK_WIDGET (c)->allocation.height - RADIUS * 2;
868 height = (c->max_y - c->min_y);
869 if (height > gdk_screen_height () / 4)
870 height = gdk_screen_height () / 4;
873 c->num_points = veclen;
874 c->point = g_malloc (c->num_points * sizeof (c->point[0]));
877 dx = (veclen - 1.0) / (c->num_points - 1.0);
879 for (i = 0; i < c->num_points; ++i, rx += dx)
881 ry = vector[(int) (rx + 0.5)];
882 if (ry > c->max_y) ry = c->max_y;
883 if (ry < c->min_y) ry = c->min_y;
884 c->point[i].x = RADIUS + i;
886 RADIUS + height - project (ry, c->min_y, c->max_y, height);
888 if (old_type != GTK_CURVE_TYPE_FREE)
890 gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
891 g_object_notify (G_OBJECT (c), "curve_type");
894 gtk_curve_draw (c, c->num_points, height);
898 gtk_curve_get_vector (GtkCurve *c, int veclen, gfloat vector[])
900 gfloat rx, ry, dx, dy, min_x, delta_x, *mem, *xv, *yv, *y2v, prev;
901 gint dst, i, x, next, num_active_ctlpoints = 0, first_active = -1;
905 if (c->curve_type != GTK_CURVE_TYPE_FREE)
907 /* count active points: */
909 for (i = num_active_ctlpoints = 0; i < c->num_ctlpoints; ++i)
910 if (c->ctlpoint[i][0] > prev)
912 if (first_active < 0)
914 prev = c->ctlpoint[i][0];
915 ++num_active_ctlpoints;
918 /* handle degenerate case: */
919 if (num_active_ctlpoints < 2)
921 if (num_active_ctlpoints > 0)
922 ry = c->ctlpoint[first_active][1];
925 if (ry < c->min_y) ry = c->min_y;
926 if (ry > c->max_y) ry = c->max_y;
927 for (x = 0; x < veclen; ++x)
933 switch (c->curve_type)
935 case GTK_CURVE_TYPE_SPLINE:
936 mem = g_malloc (3 * num_active_ctlpoints * sizeof (gfloat));
938 yv = mem + num_active_ctlpoints;
939 y2v = mem + 2*num_active_ctlpoints;
942 for (i = dst = 0; i < c->num_ctlpoints; ++i)
943 if (c->ctlpoint[i][0] > prev)
945 prev = c->ctlpoint[i][0];
946 xv[dst] = c->ctlpoint[i][0];
947 yv[dst] = c->ctlpoint[i][1];
951 spline_solve (num_active_ctlpoints, xv, yv, y2v);
954 dx = (c->max_x - min_x) / (veclen - 1);
955 for (x = 0; x < veclen; ++x, rx += dx)
957 ry = spline_eval (num_active_ctlpoints, xv, yv, y2v, rx);
958 if (ry < c->min_y) ry = c->min_y;
959 if (ry > c->max_y) ry = c->max_y;
966 case GTK_CURVE_TYPE_LINEAR:
967 dx = (c->max_x - min_x) / (veclen - 1);
972 for (x = 0; x < veclen; ++x, rx += dx)
974 if (rx >= c->ctlpoint[i][0])
976 if (rx > c->ctlpoint[i][0])
980 while (next < c->num_ctlpoints
981 && c->ctlpoint[next][0] <= c->ctlpoint[i][0])
983 if (next < c->num_ctlpoints)
985 delta_x = c->ctlpoint[next][0] - c->ctlpoint[i][0];
986 dy = ((c->ctlpoint[next][1] - c->ctlpoint[i][1])
989 ry = c->ctlpoint[i][1];
998 case GTK_CURVE_TYPE_FREE:
1002 dx = c->num_points / (double) veclen;
1003 for (x = 0; x < veclen; ++x, rx += dx)
1004 vector[x] = unproject (RADIUS + c->height - c->point[(int) rx].y,
1009 memset (vector, 0, veclen * sizeof (vector[0]));
1015 gtk_curve_new (void)
1017 return gtk_type_new (gtk_curve_get_type ());
1021 gtk_curve_finalize (GObject *object)
1025 g_return_if_fail (GTK_IS_CURVE (object));
1027 curve = GTK_CURVE (object);
1029 gdk_pixmap_unref (curve->pixmap);
1031 g_free (curve->point);
1032 if (curve->ctlpoint)
1033 g_free (curve->ctlpoint);
1035 G_OBJECT_CLASS (parent_class)->finalize (object);