1 /* HSV color selector for GTK+
3 * Copyright (C) 1999 The Free Software Foundation
5 * Authors: Simon Budig <Simon.Budig@unix-ag.org> (original code)
6 * Federico Mena-Quintero <federico@gimp.org> (cleanup for GTK+)
7 * Jonathan Blandford <jrb@redhat.com> (cleanup for GTK+)
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the
21 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 * Boston, MA 02111-1307, USA.
26 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
27 * file for a list of people on the GTK+ Team. See the ChangeLog
28 * files for a list of changes. These files are distributed with
29 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
37 #include "gdk/gdkkeysyms.h"
40 #include "gtkbindings.h"
41 #include "gtkmarshalers.h"
42 #include "gtktypeutils.h"
45 /* Default width/height */
46 #define DEFAULT_SIZE 100
48 /* Default ring width */
49 #define DEFAULT_RING_WIDTH 10
59 /* Private part of the GtkHSV structure */
67 /* Size and ring width */
71 /* Window for capturing events */
77 guint focus_on_ring : 1;
89 static void gtk_hsv_destroy (GtkWidget *widget);
90 static void gtk_hsv_map (GtkWidget *widget);
91 static void gtk_hsv_unmap (GtkWidget *widget);
92 static void gtk_hsv_realize (GtkWidget *widget);
93 static void gtk_hsv_unrealize (GtkWidget *widget);
94 static void gtk_hsv_size_request (GtkWidget *widget,
95 GtkRequisition *requisition);
96 static void gtk_hsv_size_allocate (GtkWidget *widget,
97 GtkAllocation *allocation);
98 static gint gtk_hsv_button_press (GtkWidget *widget,
99 GdkEventButton *event);
100 static gint gtk_hsv_button_release (GtkWidget *widget,
101 GdkEventButton *event);
102 static gint gtk_hsv_motion (GtkWidget *widget,
103 GdkEventMotion *event);
104 static gboolean gtk_hsv_draw (GtkWidget *widget,
106 static gboolean gtk_hsv_grab_broken (GtkWidget *widget,
107 GdkEventGrabBroken *event);
108 static gboolean gtk_hsv_focus (GtkWidget *widget,
109 GtkDirectionType direction);
110 static void gtk_hsv_move (GtkHSV *hsv,
111 GtkDirectionType dir);
113 static guint hsv_signals[LAST_SIGNAL];
115 G_DEFINE_TYPE (GtkHSV, gtk_hsv, GTK_TYPE_WIDGET)
117 /* Class initialization function for the HSV color selector */
119 gtk_hsv_class_init (GtkHSVClass *class)
121 GObjectClass *gobject_class;
122 GtkWidgetClass *widget_class;
123 GtkHSVClass *hsv_class;
124 GtkBindingSet *binding_set;
126 gobject_class = (GObjectClass *) class;
127 widget_class = (GtkWidgetClass *) class;
128 hsv_class = GTK_HSV_CLASS (class);
130 widget_class->destroy = gtk_hsv_destroy;
131 widget_class->map = gtk_hsv_map;
132 widget_class->unmap = gtk_hsv_unmap;
133 widget_class->realize = gtk_hsv_realize;
134 widget_class->unrealize = gtk_hsv_unrealize;
135 widget_class->size_request = gtk_hsv_size_request;
136 widget_class->size_allocate = gtk_hsv_size_allocate;
137 widget_class->button_press_event = gtk_hsv_button_press;
138 widget_class->button_release_event = gtk_hsv_button_release;
139 widget_class->motion_notify_event = gtk_hsv_motion;
140 widget_class->draw = gtk_hsv_draw;
141 widget_class->focus = gtk_hsv_focus;
142 widget_class->grab_broken_event = gtk_hsv_grab_broken;
144 hsv_class->move = gtk_hsv_move;
146 hsv_signals[CHANGED] =
147 g_signal_new (I_("changed"),
148 G_OBJECT_CLASS_TYPE (gobject_class),
150 G_STRUCT_OFFSET (GtkHSVClass, changed),
152 _gtk_marshal_VOID__VOID,
156 g_signal_new (I_("move"),
157 G_OBJECT_CLASS_TYPE (gobject_class),
158 G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
159 G_STRUCT_OFFSET (GtkHSVClass, move),
161 _gtk_marshal_VOID__ENUM,
163 GTK_TYPE_DIRECTION_TYPE);
165 binding_set = gtk_binding_set_by_class (class);
167 gtk_binding_entry_add_signal (binding_set, GDK_KEY_Up, 0,
169 G_TYPE_ENUM, GTK_DIR_UP);
170 gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Up, 0,
172 G_TYPE_ENUM, GTK_DIR_UP);
174 gtk_binding_entry_add_signal (binding_set, GDK_KEY_Down, 0,
176 G_TYPE_ENUM, GTK_DIR_DOWN);
177 gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Down, 0,
179 G_TYPE_ENUM, GTK_DIR_DOWN);
182 gtk_binding_entry_add_signal (binding_set, GDK_KEY_Right, 0,
184 G_TYPE_ENUM, GTK_DIR_RIGHT);
185 gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Right, 0,
187 G_TYPE_ENUM, GTK_DIR_RIGHT);
189 gtk_binding_entry_add_signal (binding_set, GDK_KEY_Left, 0,
191 G_TYPE_ENUM, GTK_DIR_LEFT);
192 gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Left, 0,
194 G_TYPE_ENUM, GTK_DIR_LEFT);
196 g_type_class_add_private (gobject_class, sizeof (GtkHSVPrivate));
199 /* Object initialization function for the HSV color selector */
201 gtk_hsv_init (GtkHSV *hsv)
205 priv = G_TYPE_INSTANCE_GET_PRIVATE (hsv, GTK_TYPE_HSV, GtkHSVPrivate);
209 gtk_widget_set_has_window (GTK_WIDGET (hsv), FALSE);
210 gtk_widget_set_can_focus (GTK_WIDGET (hsv), TRUE);
216 priv->size = DEFAULT_SIZE;
217 priv->ring_width = DEFAULT_RING_WIDTH;
220 /* Destroy handler for the HSV color selector */
222 gtk_hsv_destroy (GtkWidget *widget)
224 GTK_WIDGET_CLASS (gtk_hsv_parent_class)->destroy (widget);
227 /* Default signal handlers */
230 /* Map handler for the HSV color selector */
233 gtk_hsv_map (GtkWidget *widget)
235 GtkHSV *hsv = GTK_HSV (widget);
236 GtkHSVPrivate *priv = hsv->priv;
238 GTK_WIDGET_CLASS (gtk_hsv_parent_class)->map (widget);
240 gdk_window_show (priv->window);
243 /* Unmap handler for the HSV color selector */
246 gtk_hsv_unmap (GtkWidget *widget)
248 GtkHSV *hsv = GTK_HSV (widget);
249 GtkHSVPrivate *priv = hsv->priv;
251 gdk_window_hide (priv->window);
253 GTK_WIDGET_CLASS (gtk_hsv_parent_class)->unmap (widget);
256 /* Realize handler for the HSV color selector */
258 gtk_hsv_realize (GtkWidget *widget)
260 GtkHSV *hsv = GTK_HSV (widget);
261 GtkHSVPrivate *priv = hsv->priv;
262 GtkAllocation allocation;
263 GdkWindow *parent_window;
267 gtk_widget_set_realized (widget, TRUE);
271 gtk_widget_get_allocation (widget, &allocation);
273 attr.window_type = GDK_WINDOW_CHILD;
274 attr.x = allocation.x;
275 attr.y = allocation.y;
276 attr.width = allocation.width;
277 attr.height = allocation.height;
278 attr.wclass = GDK_INPUT_ONLY;
279 attr.event_mask = gtk_widget_get_events (widget);
280 attr.event_mask |= (GDK_KEY_PRESS_MASK
281 | GDK_BUTTON_PRESS_MASK
282 | GDK_BUTTON_RELEASE_MASK
283 | GDK_POINTER_MOTION_MASK
284 | GDK_ENTER_NOTIFY_MASK
285 | GDK_LEAVE_NOTIFY_MASK);
286 attr_mask = GDK_WA_X | GDK_WA_Y;
288 parent_window = gtk_widget_get_parent_window (widget);
289 gtk_widget_set_window (widget, parent_window);
290 g_object_ref (parent_window);
292 priv->window = gdk_window_new (parent_window, &attr, attr_mask);
293 gdk_window_set_user_data (priv->window, hsv);
295 gtk_widget_style_attach (widget);
298 /* Unrealize handler for the HSV color selector */
300 gtk_hsv_unrealize (GtkWidget *widget)
302 GtkHSV *hsv = GTK_HSV (widget);
303 GtkHSVPrivate *priv = hsv->priv;
305 gdk_window_set_user_data (priv->window, NULL);
306 gdk_window_destroy (priv->window);
309 GTK_WIDGET_CLASS (gtk_hsv_parent_class)->unrealize (widget);
312 /* Size_request handler for the HSV color selector */
314 gtk_hsv_size_request (GtkWidget *widget,
315 GtkRequisition *requisition)
317 GtkHSV *hsv = GTK_HSV (widget);
318 GtkHSVPrivate *priv = hsv->priv;
322 gtk_widget_style_get (widget,
323 "focus-line-width", &focus_width,
324 "focus-padding", &focus_pad,
327 requisition->width = priv->size + 2 * (focus_width + focus_pad);
328 requisition->height = priv->size + 2 * (focus_width + focus_pad);
331 /* Size_allocate handler for the HSV color selector */
333 gtk_hsv_size_allocate (GtkWidget *widget,
334 GtkAllocation *allocation)
336 GtkHSV *hsv = GTK_HSV (widget);
337 GtkHSVPrivate *priv = hsv->priv;
339 gtk_widget_set_allocation (widget, allocation);
341 if (gtk_widget_get_realized (widget))
342 gdk_window_move_resize (priv->window,
350 /* Utility functions */
352 #define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11)
354 /* Converts from HSV to RGB */
356 hsv_to_rgb (gdouble *h,
360 gdouble hue, saturation, value;
379 p = value * (1.0 - saturation);
380 q = value * (1.0 - saturation * f);
381 t = value * (1.0 - saturation * (1.0 - f));
422 g_assert_not_reached ();
427 /* Converts from RGB to HSV */
429 rgb_to_hsv (gdouble *r,
433 gdouble red, green, blue;
472 s = (max - min) / max;
483 h = (green - blue) / delta;
484 else if (green == max)
485 h = 2 + (blue - red) / delta;
486 else if (blue == max)
487 h = 4 + (red - green) / delta;
502 /* Computes the vertices of the saturation/value triangle */
504 compute_triangle (GtkHSV *hsv,
512 GtkHSVPrivate *priv = hsv->priv;
513 GtkWidget *widget = GTK_WIDGET (hsv);
516 gdouble inner, outer;
519 center_x = gtk_widget_get_allocated_width (widget) / 2.0;
520 center_y = gtk_widget_get_allocated_height (widget) / 2.0;
521 outer = priv->size / 2.0;
522 inner = outer - priv->ring_width;
523 angle = priv->h * 2.0 * G_PI;
525 *hx = floor (center_x + cos (angle) * inner + 0.5);
526 *hy = floor (center_y - sin (angle) * inner + 0.5);
527 *sx = floor (center_x + cos (angle + 2.0 * G_PI / 3.0) * inner + 0.5);
528 *sy = floor (center_y - sin (angle + 2.0 * G_PI / 3.0) * inner + 0.5);
529 *vx = floor (center_x + cos (angle + 4.0 * G_PI / 3.0) * inner + 0.5);
530 *vy = floor (center_y - sin (angle + 4.0 * G_PI / 3.0) * inner + 0.5);
533 /* Computes whether a point is inside the hue ring */
535 is_in_ring (GtkHSV *hsv,
539 GtkHSVPrivate *priv = hsv->priv;
540 GtkWidget *widget = GTK_WIDGET (hsv);
541 gdouble dx, dy, dist;
544 gdouble inner, outer;
546 center_x = gtk_widget_get_allocated_width (widget) / 2.0;
547 center_y = gtk_widget_get_allocated_height (widget) / 2.0;
548 outer = priv->size / 2.0;
549 inner = outer - priv->ring_width;
553 dist = dx * dx + dy * dy;
555 return (dist >= inner * inner && dist <= outer * outer);
558 /* Computes a saturation/value pair based on the mouse coordinates */
560 compute_sv (GtkHSV *hsv,
566 GtkWidget *widget = GTK_WIDGET (hsv);
567 int ihx, ihy, isx, isy, ivx, ivy;
568 double hx, hy, sx, sy, vx, vy;
572 compute_triangle (hsv, &ihx, &ihy, &isx, &isy, &ivx, &ivy);
573 center_x = gtk_widget_get_allocated_width (widget) / 2.0;
574 center_y = gtk_widget_get_allocated_height (widget) / 2.0;
584 if (vx * (x - sx) + vy * (y - sy) < 0.0)
587 *v = (((x - sx) * (hx - sx) + (y - sy) * (hy-sy))
588 / ((hx - sx) * (hx - sx) + (hy - sy) * (hy - sy)));
595 else if (hx * (x - sx) + hy * (y - sy) < 0.0)
598 *v = (((x - sx) * (vx - sx) + (y - sy) * (vy - sy))
599 / ((vx - sx) * (vx - sx) + (vy - sy) * (vy - sy)));
606 else if (sx * (x - hx) + sy * (y - hy) < 0.0)
609 *s = (((x - vx) * (hx - vx) + (y - vy) * (hy - vy)) /
610 ((hx - vx) * (hx - vx) + (hy - vy) * (hy - vy)));
619 *v = (((x - sx) * (hy - vy) - (y - sy) * (hx - vx))
620 / ((vx - sx) * (hy - vy) - (vy - sy) * (hx - vx)));
632 if (fabs (hy - vy) < fabs (hx - vx))
633 *s = (x - sx - *v * (vx - sx)) / (*v * (hx - vx));
635 *s = (y - sy - *v * (vy - sy)) / (*v * (hy - vy));
645 /* Computes whether a point is inside the saturation/value triangle */
647 is_in_triangle (GtkHSV *hsv,
651 int hx, hy, sx, sy, vx, vy;
654 compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy);
656 det = (vx - sx) * (hy - sy) - (vy - sy) * (hx - sx);
658 s = ((x - sx) * (hy - sy) - (y - sy) * (hx - sx)) / det;
659 v = ((vx - sx) * (y - sy) - (vy - sy) * (x - sx)) / det;
661 return (s >= 0.0 && v >= 0.0 && s + v <= 1.0);
664 /* Computes a value based on the mouse coordinates */
666 compute_v (GtkHSV *hsv,
670 GtkWidget *widget = GTK_WIDGET (hsv);
676 center_x = gtk_widget_get_allocated_width (widget) / 2.0;
677 center_y = gtk_widget_get_allocated_height (widget) / 2.0;
681 angle = atan2 (dy, dx);
685 return angle / (2.0 * G_PI);
691 set_cross_grab (GtkHSV *hsv,
694 GtkHSVPrivate *priv = hsv->priv;
697 cursor = gdk_cursor_new_for_display (gtk_widget_get_display (GTK_WIDGET (hsv)),
699 gdk_pointer_grab (priv->window, FALSE,
700 (GDK_POINTER_MOTION_MASK
701 | GDK_POINTER_MOTION_HINT_MASK
702 | GDK_BUTTON_RELEASE_MASK),
706 gdk_cursor_unref (cursor);
710 gtk_hsv_grab_broken (GtkWidget *widget,
711 GdkEventGrabBroken *event)
713 GtkHSV *hsv = GTK_HSV (widget);
714 GtkHSVPrivate *priv = hsv->priv;
716 priv->mode = DRAG_NONE;
721 /* Button_press_event handler for the HSV color selector */
723 gtk_hsv_button_press (GtkWidget *widget,
724 GdkEventButton *event)
726 GtkHSV *hsv = GTK_HSV (widget);
727 GtkHSVPrivate *priv = hsv->priv;
730 if (priv->mode != DRAG_NONE || event->button != 1)
736 if (is_in_ring (hsv, x, y))
739 set_cross_grab (hsv, event->time);
741 gtk_hsv_set_color (hsv,
742 compute_v (hsv, x, y),
746 gtk_widget_grab_focus (widget);
747 priv->focus_on_ring = TRUE;
752 if (is_in_triangle (hsv, x, y))
756 priv->mode = DRAG_SV;
757 set_cross_grab (hsv, event->time);
759 compute_sv (hsv, x, y, &s, &v);
760 gtk_hsv_set_color (hsv, priv->h, s, v);
762 gtk_widget_grab_focus (widget);
763 priv->focus_on_ring = FALSE;
771 /* Button_release_event handler for the HSV color selector */
773 gtk_hsv_button_release (GtkWidget *widget,
774 GdkEventButton *event)
776 GtkHSV *hsv = GTK_HSV (widget);
777 GtkHSVPrivate *priv = hsv->priv;
781 if (priv->mode == DRAG_NONE || event->button != 1)
784 /* Set the drag mode to DRAG_NONE so that signal handlers for "catched"
785 * can see that this is the final color state.
789 priv->mode = DRAG_NONE;
795 gtk_hsv_set_color (hsv, compute_v (hsv, x, y), priv->s, priv->v);
796 else if (mode == DRAG_SV) {
799 compute_sv (hsv, x, y, &s, &v);
800 gtk_hsv_set_color (hsv, priv->h, s, v);
802 g_assert_not_reached ();
804 gdk_display_pointer_ungrab (gdk_window_get_display (event->window),
809 /* Motion_notify_event handler for the HSV color selector */
811 gtk_hsv_motion (GtkWidget *widget,
812 GdkEventMotion *event)
814 GtkHSV *hsv = GTK_HSV (widget);
815 GtkHSVPrivate *priv = hsv->priv;
816 GdkModifierType mods;
819 if (priv->mode == DRAG_NONE)
822 gdk_event_request_motions (event);
827 if (priv->mode == DRAG_H)
829 gtk_hsv_set_color (hsv, compute_v (hsv, x, y), priv->s, priv->v);
832 else if (priv->mode == DRAG_SV)
836 compute_sv (hsv, x, y, &s, &v);
837 gtk_hsv_set_color (hsv, priv->h, s, v);
841 g_assert_not_reached ();
848 /* Paints the hue ring */
850 paint_ring (GtkHSV *hsv,
853 GtkHSVPrivate *priv = hsv->priv;
854 GtkWidget *widget = GTK_WIDGET (hsv);
855 int xx, yy, width, height;
856 gdouble dx, dy, dist;
859 gdouble inner, outer;
864 cairo_surface_t *source;
870 gtk_widget_style_get (widget,
871 "focus-line-width", &focus_width,
872 "focus-padding", &focus_pad,
875 width = gtk_widget_get_allocated_width (widget);
876 height = gtk_widget_get_allocated_height (widget);
878 center_x = width / 2.0;
879 center_y = height / 2.0;
881 outer = priv->size / 2.0;
882 inner = outer - priv->ring_width;
884 /* Create an image initialized with the ring colors */
886 stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width);
887 buf = g_new (guint32, height * stride / 4);
889 for (yy = 0; yy < height; yy++)
891 p = buf + yy * width;
893 dy = -(yy - center_y);
895 for (xx = 0; xx < width; xx++)
899 dist = dx * dx + dy * dy;
900 if (dist < ((inner-1) * (inner-1)) || dist > ((outer+1) * (outer+1)))
906 angle = atan2 (dy, dx);
910 hue = angle / (2.0 * G_PI);
915 hsv_to_rgb (&r, &g, &b);
917 *p++ = (((int)floor (r * 255 + 0.5) << 16) |
918 ((int)floor (g * 255 + 0.5) << 8) |
919 (int)floor (b * 255 + 0.5));
923 source = cairo_image_surface_create_for_data ((unsigned char *)buf,
925 width, height, stride);
927 /* Now draw the value marker onto the source image, so that it
928 * will get properly clipped at the edges of the ring
930 source_cr = cairo_create (source);
935 hsv_to_rgb (&r, &g, &b);
937 if (INTENSITY (r, g, b) > 0.5)
938 cairo_set_source_rgb (source_cr, 0., 0., 0.);
940 cairo_set_source_rgb (source_cr, 1., 1., 1.);
942 cairo_move_to (source_cr, center_x, center_y);
943 cairo_line_to (source_cr,
944 center_x + cos (priv->h * 2.0 * G_PI) * priv->size / 2,
945 center_y - sin (priv->h * 2.0 * G_PI) * priv->size / 2);
946 cairo_stroke (source_cr);
947 cairo_destroy (source_cr);
949 /* Draw the ring using the source image */
953 cairo_set_source_surface (cr, source, 0, 0);
954 cairo_surface_destroy (source);
956 cairo_set_line_width (cr, priv->ring_width);
960 priv->size / 2. - priv->ring_width / 2.,
969 /* Converts an HSV triplet to an integer RGB triplet */
971 get_color (gdouble h,
978 hsv_to_rgb (&h, &s, &v);
980 *r = floor (h * 255 + 0.5);
981 *g = floor (s * 255 + 0.5);
982 *b = floor (v * 255 + 0.5);
985 #define SWAP(a, b, t) ((t) = (a), (a) = (b), (b) = (t))
987 #define LERP(a, b, v1, v2, i) (((v2) - (v1) != 0) \
988 ? ((a) + ((b) - (a)) * ((i) - (v1)) / ((v2) - (v1))) \
991 /* Number of pixels we extend out from the edges when creating
992 * color source to avoid artifacts
996 /* Paints the HSV triangle */
998 paint_triangle (GtkHSV *hsv,
1001 GtkHSVPrivate *priv = hsv->priv;
1002 GtkWidget *widget = GTK_WIDGET (hsv);
1003 gint hx, hy, sx, sy, vx, vy; /* HSV vertices */
1004 gint x1, y1, r1, g1, b1; /* First vertex in scanline order */
1005 gint x2, y2, r2, g2, b2; /* Second vertex */
1006 gint x3, y3, r3, g3, b3; /* Third vertex */
1008 guint32 *buf, *p, c;
1009 gint xl, xr, rl, rr, gl, gr, bl, br; /* Scanline data */
1011 gint x_interp, y_interp;
1012 gint x_start, x_end;
1013 cairo_surface_t *source;
1020 width = gtk_widget_get_allocated_width (widget);
1021 height = gtk_widget_get_allocated_height (widget);
1022 /* Compute triangle's vertices */
1024 compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy);
1028 get_color (priv->h, 1.0, 1.0, &r1, &g1, &b1);
1032 get_color (priv->h, 1.0, 0.0, &r2, &g2, &b2);
1036 get_color (priv->h, 0.0, 1.0, &r3, &g3, &b3);
1065 /* Shade the triangle */
1067 stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width);
1068 buf = g_new (guint32, height * stride / 4);
1070 for (yy = 0; yy < height; yy++)
1072 p = buf + yy * width;
1074 if (yy >= y1 - PAD && yy < y3 + PAD) {
1075 y_interp = CLAMP (yy, y1, y3);
1079 xl = LERP (x1, x2, y1, y2, y_interp);
1081 rl = LERP (r1, r2, y1, y2, y_interp);
1082 gl = LERP (g1, g2, y1, y2, y_interp);
1083 bl = LERP (b1, b2, y1, y2, y_interp);
1087 xl = LERP (x2, x3, y2, y3, y_interp);
1089 rl = LERP (r2, r3, y2, y3, y_interp);
1090 gl = LERP (g2, g3, y2, y3, y_interp);
1091 bl = LERP (b2, b3, y2, y3, y_interp);
1094 xr = LERP (x1, x3, y1, y3, y_interp);
1096 rr = LERP (r1, r3, y1, y3, y_interp);
1097 gr = LERP (g1, g3, y1, y3, y_interp);
1098 br = LERP (b1, b3, y1, y3, y_interp);
1108 x_start = MAX (xl - PAD, 0);
1109 x_end = MIN (xr + PAD, width);
1110 x_start = MIN (x_start, x_end);
1112 c = (rl << 16) | (gl << 8) | bl;
1114 for (xx = 0; xx < x_start; xx++)
1117 for (; xx < x_end; xx++)
1119 x_interp = CLAMP (xx, xl, xr);
1121 *p++ = ((LERP (rl, rr, xl, xr, x_interp) << 16) |
1122 (LERP (gl, gr, xl, xr, x_interp) << 8) |
1123 LERP (bl, br, xl, xr, x_interp));
1126 c = (rr << 16) | (gr << 8) | br;
1128 for (; xx < width; xx++)
1133 source = cairo_image_surface_create_for_data ((unsigned char *)buf,
1135 width, height, stride);
1137 /* Draw a triangle with the image as a source */
1139 cairo_set_source_surface (cr, source, 0, 0);
1140 cairo_surface_destroy (source);
1142 cairo_move_to (cr, x1, y1);
1143 cairo_line_to (cr, x2, y2);
1144 cairo_line_to (cr, x3, y3);
1145 cairo_close_path (cr);
1150 /* Draw value marker */
1152 xx = floor (sx + (vx - sx) * priv->v + (hx - vx) * priv->s * priv->v + 0.5);
1153 yy = floor (sy + (vy - sy) * priv->v + (hy - vy) * priv->s * priv->v + 0.5);
1158 hsv_to_rgb (&r, &g, &b);
1160 if (INTENSITY (r, g, b) > 0.5)
1162 detail = "colorwheel_light";
1163 cairo_set_source_rgb (cr, 0., 0., 0.);
1167 detail = "colorwheel_dark";
1168 cairo_set_source_rgb (cr, 1., 1., 1.);
1172 #define FOCUS_RADIUS 6
1174 cairo_new_path (cr);
1175 cairo_arc (cr, xx, yy, RADIUS, 0, 2 * G_PI);
1178 /* Draw focus outline */
1180 if (gtk_widget_has_focus (widget) &&
1181 !priv->focus_on_ring)
1186 gtk_widget_style_get (widget,
1187 "focus-line-width", &focus_width,
1188 "focus-padding", &focus_pad,
1191 gtk_paint_focus (gtk_widget_get_style (widget),
1193 gtk_widget_get_state (widget),
1195 xx - FOCUS_RADIUS - focus_width - focus_pad,
1196 yy - FOCUS_RADIUS - focus_width - focus_pad,
1197 2 * (FOCUS_RADIUS + focus_width + focus_pad),
1198 2 * (FOCUS_RADIUS + focus_width + focus_pad));
1202 /* Paints the contents of the HSV color selector */
1204 gtk_hsv_draw (GtkWidget *widget,
1207 GtkHSV *hsv = GTK_HSV (widget);
1208 GtkHSVPrivate *priv = hsv->priv;
1210 paint_ring (hsv, cr);
1211 paint_triangle (hsv, cr);
1213 if (gtk_widget_has_focus (widget) && priv->focus_on_ring)
1214 gtk_paint_focus (gtk_widget_get_style (widget),
1216 gtk_widget_get_state (widget),
1219 gtk_widget_get_allocated_width (widget),
1220 gtk_widget_get_allocated_height (widget));
1226 gtk_hsv_focus (GtkWidget *widget,
1227 GtkDirectionType dir)
1229 GtkHSV *hsv = GTK_HSV (widget);
1230 GtkHSVPrivate *priv = hsv->priv;
1232 if (!gtk_widget_has_focus (widget))
1234 if (dir == GTK_DIR_TAB_BACKWARD)
1235 priv->focus_on_ring = FALSE;
1237 priv->focus_on_ring = TRUE;
1239 gtk_widget_grab_focus (GTK_WIDGET (hsv));
1246 if (priv->focus_on_ring)
1249 priv->focus_on_ring = TRUE;
1253 if (priv->focus_on_ring)
1254 priv->focus_on_ring = FALSE;
1260 case GTK_DIR_TAB_BACKWARD:
1261 if (priv->focus_on_ring)
1264 priv->focus_on_ring = TRUE;
1268 case GTK_DIR_TAB_FORWARD:
1269 if (priv->focus_on_ring)
1270 priv->focus_on_ring = FALSE;
1276 gtk_widget_queue_draw (GTK_WIDGET (hsv));
1284 * Creates a new HSV color selector.
1286 * Return value: A newly-created HSV color selector.
1293 return g_object_new (GTK_TYPE_HSV, NULL);
1297 * gtk_hsv_set_color:
1298 * @hsv: An HSV color selector
1303 * Sets the current color in an HSV color selector.
1304 * Color component values must be in the [0.0, 1.0] range.
1309 gtk_hsv_set_color (GtkHSV *hsv,
1314 GtkHSVPrivate *priv;
1316 g_return_if_fail (GTK_IS_HSV (hsv));
1317 g_return_if_fail (h >= 0.0 && h <= 1.0);
1318 g_return_if_fail (s >= 0.0 && s <= 1.0);
1319 g_return_if_fail (v >= 0.0 && v <= 1.0);
1327 g_signal_emit (hsv, hsv_signals[CHANGED], 0);
1329 gtk_widget_queue_draw (GTK_WIDGET (hsv));
1333 * gtk_hsv_get_color:
1334 * @hsv: An HSV color selector
1335 * @h: Return value for the hue
1336 * @s: Return value for the saturation
1337 * @v: Return value for the value
1339 * Queries the current color in an HSV color selector.
1340 * Returned values will be in the [0.0, 1.0] range.
1345 gtk_hsv_get_color (GtkHSV *hsv,
1350 GtkHSVPrivate *priv = hsv->priv;
1352 g_return_if_fail (GTK_IS_HSV (hsv));
1367 * gtk_hsv_set_metrics:
1368 * @hsv: An HSV color selector
1369 * @size: Diameter for the hue ring
1370 * @ring_width: Width of the hue ring
1372 * Sets the size and ring width of an HSV color selector.
1377 gtk_hsv_set_metrics (GtkHSV *hsv,
1381 GtkHSVPrivate *priv = hsv->priv;
1384 g_return_if_fail (GTK_IS_HSV (hsv));
1385 g_return_if_fail (size > 0);
1386 g_return_if_fail (ring_width > 0);
1387 g_return_if_fail (2 * ring_width + 1 <= size);
1391 same_size = (priv->size == size);
1394 priv->ring_width = ring_width;
1397 gtk_widget_queue_draw (GTK_WIDGET (hsv));
1399 gtk_widget_queue_resize (GTK_WIDGET (hsv));
1403 * gtk_hsv_get_metrics:
1404 * @hsv: An HSV color selector
1405 * @size: Return value for the diameter of the hue ring
1406 * @ring_width: Return value for the width of the hue ring
1408 * Queries the size and ring width of an HSV color selector.
1413 gtk_hsv_get_metrics (GtkHSV *hsv,
1417 GtkHSVPrivate *priv = hsv->priv;
1419 g_return_if_fail (GTK_IS_HSV (hsv));
1427 *ring_width = priv->ring_width;
1431 * gtk_hsv_is_adjusting:
1434 * An HSV color selector can be said to be adjusting if multiple rapid
1435 * changes are being made to its value, for example, when the user is
1436 * adjusting the value with the mouse. This function queries whether
1437 * the HSV color selector is being adjusted or not.
1439 * Return value: %TRUE if clients can ignore changes to the color value,
1440 * since they may be transitory, or %FALSE if they should consider
1441 * the color value status to be final.
1446 gtk_hsv_is_adjusting (GtkHSV *hsv)
1448 GtkHSVPrivate *priv = hsv->priv;
1450 g_return_val_if_fail (GTK_IS_HSV (hsv), FALSE);
1454 return priv->mode != DRAG_NONE;
1462 * @r: Return value for the red component
1463 * @g: Return value for the green component
1464 * @b: Return value for the blue component
1466 * Converts a color from HSV space to RGB.
1467 * Input values must be in the [0.0, 1.0] range;
1468 * output values will be in the same range.
1473 gtk_hsv_to_rgb (gdouble h,
1480 g_return_if_fail (h >= 0.0 && h <= 1.0);
1481 g_return_if_fail (s >= 0.0 && s <= 1.0);
1482 g_return_if_fail (v >= 0.0 && v <= 1.0);
1484 hsv_to_rgb (&h, &s, &v);
1501 * @h: Return value for the hue component
1502 * @s: Return value for the saturation component
1503 * @v: Return value for the value component
1505 * Converts a color from RGB space to HSV.
1506 * Input values must be in the [0.0, 1.0] range;
1507 * output values will be in the same range.
1512 gtk_rgb_to_hsv (gdouble r,
1519 g_return_if_fail (r >= 0.0 && r <= 1.0);
1520 g_return_if_fail (g >= 0.0 && g <= 1.0);
1521 g_return_if_fail (b >= 0.0 && b <= 1.0);
1523 rgb_to_hsv (&r, &g, &b);
1536 gtk_hsv_move (GtkHSV *hsv,
1537 GtkDirectionType dir)
1539 GtkHSVPrivate *priv = hsv->priv;
1540 gdouble hue, sat, val;
1541 gint hx, hy, sx, sy, vx, vy; /* HSV vertices */
1542 gint x, y; /* position in triangle */
1548 compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy);
1550 x = floor (sx + (vx - sx) * priv->v + (hx - vx) * priv->s * priv->v + 0.5);
1551 y = floor (sy + (vy - sy) * priv->v + (hy - vy) * priv->s * priv->v + 0.5);
1553 #define HUE_DELTA 0.002
1557 if (priv->focus_on_ring)
1562 compute_sv (hsv, x, y, &sat, &val);
1567 if (priv->focus_on_ring)
1572 compute_sv (hsv, x, y, &sat, &val);
1577 if (priv->focus_on_ring)
1582 compute_sv (hsv, x, y, &sat, &val);
1587 if (priv->focus_on_ring)
1593 compute_sv (hsv, x, y, &sat, &val);
1598 /* we don't care about the tab directions */
1608 gtk_hsv_set_color (hsv, hue, sat, val);