| /* HSV color selector for GTK+ |
| * |
| * Copyright (C) 1999 The Free Software Foundation |
| * |
| * Authors: Simon Budig <Simon.Budig@unix-ag.org> (original code) |
| * Federico Mena-Quintero <federico@gimp.org> (cleanup for GTK+) |
| * Jonathan Blandford <jrb@redhat.com> (cleanup for GTK+) |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| /* |
| * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS |
| * file for a list of people on the GTK+ Team. See the ChangeLog |
| * files for a list of changes. These files are distributed with |
| * GTK+ at ftp://ftp.gtk.org/pub/gtk/. |
| */ |
| |
| #include "config.h" |
| |
| #define GDK_DISABLE_DEPRECATION_WARNINGS |
| |
| #include <math.h> |
| #include <string.h> |
| |
| #include "gtkhsv.h" |
| #include "gtkbindings.h" |
| #include "gtkmarshalers.h" |
| #include "gtkstylecontext.h" |
| #include "gtktypebuiltins.h" |
| #include "gtkintl.h" |
| |
| |
| /** |
| * SECTION:gtkhsv |
| * @Short_description: A 'color wheel' widget |
| * @Title: GtkHSV |
| * @See_also: #GtkColorSelection, #GtkColorSelectionDialog |
| * |
| * #GtkHSV is the 'color wheel' part of a complete color selector widget. |
| * It allows to select a color by determining its HSV components in an |
| * intuitive way. Moving the selection around the outer ring changes the hue, |
| * and moving the selection point inside the inner triangle changes value and |
| * saturation. |
| * |
| * #GtkHSV has been deprecated together with #GtkColorSelection, where |
| * it was used. |
| */ |
| |
| |
| /* Default width/height */ |
| #define DEFAULT_SIZE 100 |
| |
| /* Default ring width */ |
| #define DEFAULT_RING_WIDTH 10 |
| |
| |
| /* Dragging modes */ |
| typedef enum { |
| DRAG_NONE, |
| DRAG_H, |
| DRAG_SV |
| } DragMode; |
| |
| /* Private part of the GtkHSV structure */ |
| struct _GtkHSVPrivate |
| { |
| /* Color value */ |
| double h; |
| double s; |
| double v; |
| |
| /* Size and ring width */ |
| int size; |
| int ring_width; |
| |
| /* Window for capturing events */ |
| GdkWindow *window; |
| |
| /* Dragging mode */ |
| DragMode mode; |
| |
| guint focus_on_ring : 1; |
| }; |
| |
| |
| /* Signal IDs */ |
| |
| enum { |
| CHANGED, |
| MOVE, |
| LAST_SIGNAL |
| }; |
| |
| static void gtk_hsv_destroy (GtkWidget *widget); |
| static void gtk_hsv_realize (GtkWidget *widget); |
| static void gtk_hsv_unrealize (GtkWidget *widget); |
| static void gtk_hsv_get_preferred_width (GtkWidget *widget, |
| gint *minimum, |
| gint *natural); |
| static void gtk_hsv_get_preferred_height (GtkWidget *widget, |
| gint *minimum, |
| gint *natural); |
| static void gtk_hsv_size_allocate (GtkWidget *widget, |
| GtkAllocation *allocation); |
| static gboolean gtk_hsv_button_press (GtkWidget *widget, |
| GdkEventButton *event); |
| static gboolean gtk_hsv_button_release (GtkWidget *widget, |
| GdkEventButton *event); |
| static gboolean gtk_hsv_motion (GtkWidget *widget, |
| GdkEventMotion *event); |
| static gboolean gtk_hsv_draw (GtkWidget *widget, |
| cairo_t *cr); |
| static gboolean gtk_hsv_grab_broken (GtkWidget *widget, |
| GdkEventGrabBroken *event); |
| static gboolean gtk_hsv_focus (GtkWidget *widget, |
| GtkDirectionType direction); |
| static void gtk_hsv_move (GtkHSV *hsv, |
| GtkDirectionType dir); |
| |
| static guint hsv_signals[LAST_SIGNAL]; |
| |
| G_DEFINE_TYPE (GtkHSV, gtk_hsv, GTK_TYPE_WIDGET) |
| |
| /* Class initialization function for the HSV color selector */ |
| static void |
| gtk_hsv_class_init (GtkHSVClass *class) |
| { |
| GObjectClass *gobject_class; |
| GtkWidgetClass *widget_class; |
| GtkHSVClass *hsv_class; |
| GtkBindingSet *binding_set; |
| |
| gobject_class = (GObjectClass *) class; |
| widget_class = (GtkWidgetClass *) class; |
| hsv_class = GTK_HSV_CLASS (class); |
| |
| widget_class->destroy = gtk_hsv_destroy; |
| widget_class->realize = gtk_hsv_realize; |
| widget_class->unrealize = gtk_hsv_unrealize; |
| widget_class->get_preferred_width = gtk_hsv_get_preferred_width; |
| widget_class->get_preferred_height = gtk_hsv_get_preferred_height; |
| widget_class->size_allocate = gtk_hsv_size_allocate; |
| widget_class->button_press_event = gtk_hsv_button_press; |
| widget_class->button_release_event = gtk_hsv_button_release; |
| widget_class->motion_notify_event = gtk_hsv_motion; |
| widget_class->draw = gtk_hsv_draw; |
| widget_class->focus = gtk_hsv_focus; |
| widget_class->grab_broken_event = gtk_hsv_grab_broken; |
| |
| gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_COLOR_CHOOSER); |
| |
| hsv_class->move = gtk_hsv_move; |
| |
| hsv_signals[CHANGED] = |
| g_signal_new (I_("changed"), |
| G_OBJECT_CLASS_TYPE (gobject_class), |
| G_SIGNAL_RUN_FIRST, |
| G_STRUCT_OFFSET (GtkHSVClass, changed), |
| NULL, NULL, |
| _gtk_marshal_VOID__VOID, |
| G_TYPE_NONE, 0); |
| |
| hsv_signals[MOVE] = |
| g_signal_new (I_("move"), |
| G_OBJECT_CLASS_TYPE (gobject_class), |
| G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, |
| G_STRUCT_OFFSET (GtkHSVClass, move), |
| NULL, NULL, |
| _gtk_marshal_VOID__ENUM, |
| G_TYPE_NONE, 1, |
| GTK_TYPE_DIRECTION_TYPE); |
| |
| binding_set = gtk_binding_set_by_class (class); |
| |
| gtk_binding_entry_add_signal (binding_set, GDK_KEY_Up, 0, |
| "move", 1, |
| G_TYPE_ENUM, GTK_DIR_UP); |
| gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Up, 0, |
| "move", 1, |
| G_TYPE_ENUM, GTK_DIR_UP); |
| gtk_binding_entry_add_signal (binding_set, GDK_KEY_Down, 0, |
| "move", 1, |
| G_TYPE_ENUM, GTK_DIR_DOWN); |
| gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Down, 0, |
| "move", 1, |
| G_TYPE_ENUM, GTK_DIR_DOWN); |
| gtk_binding_entry_add_signal (binding_set, GDK_KEY_Right, 0, |
| "move", 1, |
| G_TYPE_ENUM, GTK_DIR_RIGHT); |
| gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Right, 0, |
| "move", 1, |
| G_TYPE_ENUM, GTK_DIR_RIGHT); |
| gtk_binding_entry_add_signal (binding_set, GDK_KEY_Left, 0, |
| "move", 1, |
| G_TYPE_ENUM, GTK_DIR_LEFT); |
| gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Left, 0, |
| "move", 1, |
| G_TYPE_ENUM, GTK_DIR_LEFT); |
| |
| g_type_class_add_private (gobject_class, sizeof (GtkHSVPrivate)); |
| } |
| |
| static void |
| gtk_hsv_init (GtkHSV *hsv) |
| { |
| GtkHSVPrivate *priv; |
| |
| priv = G_TYPE_INSTANCE_GET_PRIVATE (hsv, GTK_TYPE_HSV, GtkHSVPrivate); |
| |
| hsv->priv = priv; |
| |
| gtk_widget_set_has_window (GTK_WIDGET (hsv), FALSE); |
| gtk_widget_set_can_focus (GTK_WIDGET (hsv), TRUE); |
| |
| priv->h = 0.0; |
| priv->s = 0.0; |
| priv->v = 0.0; |
| |
| priv->size = DEFAULT_SIZE; |
| priv->ring_width = DEFAULT_RING_WIDTH; |
| } |
| |
| static void |
| gtk_hsv_destroy (GtkWidget *widget) |
| { |
| GTK_WIDGET_CLASS (gtk_hsv_parent_class)->destroy (widget); |
| } |
| |
| static void |
| gtk_hsv_realize (GtkWidget *widget) |
| { |
| GtkHSV *hsv = GTK_HSV (widget); |
| GtkHSVPrivate *priv = hsv->priv; |
| GtkAllocation allocation; |
| GdkWindow *parent_window; |
| GdkWindowAttr attr; |
| int attr_mask; |
| |
| gtk_widget_set_realized (widget, TRUE); |
| |
| gtk_widget_get_allocation (widget, &allocation); |
| |
| attr.window_type = GDK_WINDOW_CHILD; |
| attr.x = allocation.x; |
| attr.y = allocation.y; |
| attr.width = allocation.width; |
| attr.height = allocation.height; |
| attr.wclass = GDK_INPUT_ONLY; |
| attr.event_mask = gtk_widget_get_events (widget); |
| attr.event_mask |= (GDK_KEY_PRESS_MASK |
| | GDK_BUTTON_PRESS_MASK |
| | GDK_BUTTON_RELEASE_MASK |
| | GDK_POINTER_MOTION_MASK |
| | GDK_ENTER_NOTIFY_MASK |
| | GDK_LEAVE_NOTIFY_MASK); |
| attr_mask = GDK_WA_X | GDK_WA_Y; |
| |
| parent_window = gtk_widget_get_parent_window (widget); |
| gtk_widget_set_window (widget, parent_window); |
| g_object_ref (parent_window); |
| |
| priv->window = gdk_window_new (parent_window, &attr, attr_mask); |
| gdk_window_set_user_data (priv->window, hsv); |
| gdk_window_show (priv->window); |
| } |
| |
| static void |
| gtk_hsv_unrealize (GtkWidget *widget) |
| { |
| GtkHSV *hsv = GTK_HSV (widget); |
| GtkHSVPrivate *priv = hsv->priv; |
| |
| gdk_window_set_user_data (priv->window, NULL); |
| gdk_window_destroy (priv->window); |
| priv->window = NULL; |
| |
| GTK_WIDGET_CLASS (gtk_hsv_parent_class)->unrealize (widget); |
| } |
| |
| static void |
| gtk_hsv_get_preferred_width (GtkWidget *widget, |
| gint *minimum, |
| gint *natural) |
| { |
| GtkHSV *hsv = GTK_HSV (widget); |
| GtkHSVPrivate *priv = hsv->priv; |
| gint focus_width; |
| gint focus_pad; |
| |
| gtk_widget_style_get (widget, |
| "focus-line-width", &focus_width, |
| "focus-padding", &focus_pad, |
| NULL); |
| |
| *minimum = priv->size + 2 * (focus_width + focus_pad); |
| *natural = priv->size + 2 * (focus_width + focus_pad); |
| } |
| |
| static void |
| gtk_hsv_get_preferred_height (GtkWidget *widget, |
| gint *minimum, |
| gint *natural) |
| { |
| GtkHSV *hsv = GTK_HSV (widget); |
| GtkHSVPrivate *priv = hsv->priv; |
| gint focus_width; |
| gint focus_pad; |
| |
| gtk_widget_style_get (widget, |
| "focus-line-width", &focus_width, |
| "focus-padding", &focus_pad, |
| NULL); |
| |
| *minimum = priv->size + 2 * (focus_width + focus_pad); |
| *natural = priv->size + 2 * (focus_width + focus_pad); |
| } |
| |
| static void |
| gtk_hsv_size_allocate (GtkWidget *widget, |
| GtkAllocation *allocation) |
| { |
| GtkHSV *hsv = GTK_HSV (widget); |
| GtkHSVPrivate *priv = hsv->priv; |
| |
| gtk_widget_set_allocation (widget, allocation); |
| |
| if (gtk_widget_get_realized (widget)) |
| gdk_window_move_resize (priv->window, |
| allocation->x, |
| allocation->y, |
| allocation->width, |
| allocation->height); |
| } |
| |
| |
| /* Utility functions */ |
| |
| #define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11) |
| |
| /* Converts from HSV to RGB */ |
| static void |
| hsv_to_rgb (gdouble *h, |
| gdouble *s, |
| gdouble *v) |
| { |
| gdouble hue, saturation, value; |
| gdouble f, p, q, t; |
| |
| if (*s == 0.0) |
| { |
| *h = *v; |
| *s = *v; |
| *v = *v; /* heh */ |
| } |
| else |
| { |
| hue = *h * 6.0; |
| saturation = *s; |
| value = *v; |
| |
| if (hue == 6.0) |
| hue = 0.0; |
| |
| f = hue - (int) hue; |
| p = value * (1.0 - saturation); |
| q = value * (1.0 - saturation * f); |
| t = value * (1.0 - saturation * (1.0 - f)); |
| |
| switch ((int) hue) |
| { |
| case 0: |
| *h = value; |
| *s = t; |
| *v = p; |
| break; |
| |
| case 1: |
| *h = q; |
| *s = value; |
| *v = p; |
| break; |
| |
| case 2: |
| *h = p; |
| *s = value; |
| *v = t; |
| break; |
| |
| case 3: |
| *h = p; |
| *s = q; |
| *v = value; |
| break; |
| |
| case 4: |
| *h = t; |
| *s = p; |
| *v = value; |
| break; |
| |
| case 5: |
| *h = value; |
| *s = p; |
| *v = q; |
| break; |
| |
| default: |
| g_assert_not_reached (); |
| } |
| } |
| } |
| |
| /* Computes the vertices of the saturation/value triangle */ |
| static void |
| compute_triangle (GtkHSV *hsv, |
| gint *hx, |
| gint *hy, |
| gint *sx, |
| gint *sy, |
| gint *vx, |
| gint *vy) |
| { |
| GtkHSVPrivate *priv = hsv->priv; |
| GtkWidget *widget = GTK_WIDGET (hsv); |
| gdouble center_x; |
| gdouble center_y; |
| gdouble inner, outer; |
| gdouble angle; |
| |
| center_x = gtk_widget_get_allocated_width (widget) / 2.0; |
| center_y = gtk_widget_get_allocated_height (widget) / 2.0; |
| outer = priv->size / 2.0; |
| inner = outer - priv->ring_width; |
| angle = priv->h * 2.0 * G_PI; |
| |
| *hx = floor (center_x + cos (angle) * inner + 0.5); |
| *hy = floor (center_y - sin (angle) * inner + 0.5); |
| *sx = floor (center_x + cos (angle + 2.0 * G_PI / 3.0) * inner + 0.5); |
| *sy = floor (center_y - sin (angle + 2.0 * G_PI / 3.0) * inner + 0.5); |
| *vx = floor (center_x + cos (angle + 4.0 * G_PI / 3.0) * inner + 0.5); |
| *vy = floor (center_y - sin (angle + 4.0 * G_PI / 3.0) * inner + 0.5); |
| } |
| |
| /* Computes whether a point is inside the hue ring */ |
| static gboolean |
| is_in_ring (GtkHSV *hsv, |
| gdouble x, |
| gdouble y) |
| { |
| GtkHSVPrivate *priv = hsv->priv; |
| GtkWidget *widget = GTK_WIDGET (hsv); |
| gdouble dx, dy, dist; |
| gdouble center_x; |
| gdouble center_y; |
| gdouble inner, outer; |
| |
| center_x = gtk_widget_get_allocated_width (widget) / 2.0; |
| center_y = gtk_widget_get_allocated_height (widget) / 2.0; |
| outer = priv->size / 2.0; |
| inner = outer - priv->ring_width; |
| |
| dx = x - center_x; |
| dy = center_y - y; |
| dist = dx * dx + dy * dy; |
| |
| return (dist >= inner * inner && dist <= outer * outer); |
| } |
| |
| /* Computes a saturation/value pair based on the mouse coordinates */ |
| static void |
| compute_sv (GtkHSV *hsv, |
| gdouble x, |
| gdouble y, |
| gdouble *s, |
| gdouble *v) |
| { |
| GtkWidget *widget = GTK_WIDGET (hsv); |
| int ihx, ihy, isx, isy, ivx, ivy; |
| double hx, hy, sx, sy, vx, vy; |
| double center_x; |
| double center_y; |
| |
| compute_triangle (hsv, &ihx, &ihy, &isx, &isy, &ivx, &ivy); |
| center_x = gtk_widget_get_allocated_width (widget) / 2.0; |
| center_y = gtk_widget_get_allocated_height (widget) / 2.0; |
| hx = ihx - center_x; |
| hy = center_y - ihy; |
| sx = isx - center_x; |
| sy = center_y - isy; |
| vx = ivx - center_x; |
| vy = center_y - ivy; |
| x -= center_x; |
| y = center_y - y; |
| |
| if (vx * (x - sx) + vy * (y - sy) < 0.0) |
| { |
| *s = 1.0; |
| *v = (((x - sx) * (hx - sx) + (y - sy) * (hy-sy)) |
| / ((hx - sx) * (hx - sx) + (hy - sy) * (hy - sy))); |
| |
| if (*v < 0.0) |
| *v = 0.0; |
| else if (*v > 1.0) |
| *v = 1.0; |
| } |
| else if (hx * (x - sx) + hy * (y - sy) < 0.0) |
| { |
| *s = 0.0; |
| *v = (((x - sx) * (vx - sx) + (y - sy) * (vy - sy)) |
| / ((vx - sx) * (vx - sx) + (vy - sy) * (vy - sy))); |
| |
| if (*v < 0.0) |
| *v = 0.0; |
| else if (*v > 1.0) |
| *v = 1.0; |
| } |
| else if (sx * (x - hx) + sy * (y - hy) < 0.0) |
| { |
| *v = 1.0; |
| *s = (((x - vx) * (hx - vx) + (y - vy) * (hy - vy)) / |
| ((hx - vx) * (hx - vx) + (hy - vy) * (hy - vy))); |
| |
| if (*s < 0.0) |
| *s = 0.0; |
| else if (*s > 1.0) |
| *s = 1.0; |
| } |
| else |
| { |
| *v = (((x - sx) * (hy - vy) - (y - sy) * (hx - vx)) |
| / ((vx - sx) * (hy - vy) - (vy - sy) * (hx - vx))); |
| |
| if (*v<= 0.0) |
| { |
| *v = 0.0; |
| *s = 0.0; |
| } |
| else |
| { |
| if (*v > 1.0) |
| *v = 1.0; |
| |
| if (fabs (hy - vy) < fabs (hx - vx)) |
| *s = (x - sx - *v * (vx - sx)) / (*v * (hx - vx)); |
| else |
| *s = (y - sy - *v * (vy - sy)) / (*v * (hy - vy)); |
| |
| if (*s < 0.0) |
| *s = 0.0; |
| else if (*s > 1.0) |
| *s = 1.0; |
| } |
| } |
| } |
| |
| /* Computes whether a point is inside the saturation/value triangle */ |
| static gboolean |
| is_in_triangle (GtkHSV *hsv, |
| gdouble x, |
| gdouble y) |
| { |
| int hx, hy, sx, sy, vx, vy; |
| double det, s, v; |
| |
| compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy); |
| |
| det = (vx - sx) * (hy - sy) - (vy - sy) * (hx - sx); |
| |
| s = ((x - sx) * (hy - sy) - (y - sy) * (hx - sx)) / det; |
| v = ((vx - sx) * (y - sy) - (vy - sy) * (x - sx)) / det; |
| |
| return (s >= 0.0 && v >= 0.0 && s + v <= 1.0); |
| } |
| |
| /* Computes a value based on the mouse coordinates */ |
| static double |
| compute_v (GtkHSV *hsv, |
| gdouble x, |
| gdouble y) |
| { |
| GtkWidget *widget = GTK_WIDGET (hsv); |
| double center_x; |
| double center_y; |
| double dx, dy; |
| double angle; |
| |
| center_x = gtk_widget_get_allocated_width (widget) / 2.0; |
| center_y = gtk_widget_get_allocated_height (widget) / 2.0; |
| dx = x - center_x; |
| dy = center_y - y; |
| |
| angle = atan2 (dy, dx); |
| if (angle < 0.0) |
| angle += 2.0 * G_PI; |
| |
| return angle / (2.0 * G_PI); |
| } |
| |
| /* Event handlers */ |
| |
| static void |
| set_cross_grab (GtkHSV *hsv, |
| GdkDevice *device, |
| guint32 time) |
| { |
| GtkHSVPrivate *priv = hsv->priv; |
| GdkCursor *cursor; |
| |
| cursor = gdk_cursor_new_for_display (gtk_widget_get_display (GTK_WIDGET (hsv)), |
| GDK_CROSSHAIR); |
| gdk_device_grab (device, |
| priv->window, |
| GDK_OWNERSHIP_NONE, |
| FALSE, |
| GDK_POINTER_MOTION_MASK |
| | GDK_POINTER_MOTION_HINT_MASK |
| | GDK_BUTTON_RELEASE_MASK, |
| cursor, |
| time); |
| g_object_unref (cursor); |
| } |
| |
| static gboolean |
| gtk_hsv_grab_broken (GtkWidget *widget, |
| GdkEventGrabBroken *event) |
| { |
| GtkHSV *hsv = GTK_HSV (widget); |
| GtkHSVPrivate *priv = hsv->priv; |
| |
| priv->mode = DRAG_NONE; |
| |
| return TRUE; |
| } |
| |
| static gint |
| gtk_hsv_button_press (GtkWidget *widget, |
| GdkEventButton *event) |
| { |
| GtkHSV *hsv = GTK_HSV (widget); |
| GtkHSVPrivate *priv = hsv->priv; |
| double x, y; |
| |
| if (priv->mode != DRAG_NONE || event->button != GDK_BUTTON_PRIMARY) |
| return FALSE; |
| |
| x = event->x; |
| y = event->y; |
| |
| if (is_in_ring (hsv, x, y)) |
| { |
| priv->mode = DRAG_H; |
| set_cross_grab (hsv, gdk_event_get_device ((GdkEvent *) event), event->time); |
| |
| gtk_hsv_set_color (hsv, |
| compute_v (hsv, x, y), |
| priv->s, |
| priv->v); |
| |
| gtk_widget_grab_focus (widget); |
| priv->focus_on_ring = TRUE; |
| |
| return TRUE; |
| } |
| |
| if (is_in_triangle (hsv, x, y)) |
| { |
| gdouble s, v; |
| |
| priv->mode = DRAG_SV; |
| set_cross_grab (hsv, gdk_event_get_device ((GdkEvent *) event), event->time); |
| |
| compute_sv (hsv, x, y, &s, &v); |
| gtk_hsv_set_color (hsv, priv->h, s, v); |
| |
| gtk_widget_grab_focus (widget); |
| priv->focus_on_ring = FALSE; |
| |
| return TRUE; |
| } |
| |
| return FALSE; |
| } |
| |
| static gint |
| gtk_hsv_button_release (GtkWidget *widget, |
| GdkEventButton *event) |
| { |
| GtkHSV *hsv = GTK_HSV (widget); |
| GtkHSVPrivate *priv = hsv->priv; |
| DragMode mode; |
| gdouble x, y; |
| |
| if (priv->mode == DRAG_NONE || event->button != GDK_BUTTON_PRIMARY) |
| return FALSE; |
| |
| /* Set the drag mode to DRAG_NONE so that signal handlers for "catched" |
| * can see that this is the final color state. |
| */ |
| mode = priv->mode; |
| priv->mode = DRAG_NONE; |
| |
| x = event->x; |
| y = event->y; |
| |
| if (mode == DRAG_H) |
| { |
| gtk_hsv_set_color (hsv, compute_v (hsv, x, y), priv->s, priv->v); |
| } |
| else if (mode == DRAG_SV) |
| { |
| gdouble s, v; |
| |
| compute_sv (hsv, x, y, &s, &v); |
| gtk_hsv_set_color (hsv, priv->h, s, v); |
| } |
| else |
| { |
| g_assert_not_reached (); |
| } |
| |
| gdk_device_ungrab (gdk_event_get_device ((GdkEvent *) event), event->time); |
| |
| return TRUE; |
| } |
| |
| static gint |
| gtk_hsv_motion (GtkWidget *widget, |
| GdkEventMotion *event) |
| { |
| GtkHSV *hsv = GTK_HSV (widget); |
| GtkHSVPrivate *priv = hsv->priv; |
| gdouble x, y; |
| |
| if (priv->mode == DRAG_NONE) |
| return FALSE; |
| |
| gdk_event_request_motions (event); |
| x = event->x; |
| y = event->y; |
| |
| if (priv->mode == DRAG_H) |
| { |
| gtk_hsv_set_color (hsv, compute_v (hsv, x, y), priv->s, priv->v); |
| return TRUE; |
| } |
| else if (priv->mode == DRAG_SV) |
| { |
| gdouble s, v; |
| |
| compute_sv (hsv, x, y, &s, &v); |
| gtk_hsv_set_color (hsv, priv->h, s, v); |
| return TRUE; |
| } |
| |
| g_assert_not_reached (); |
| |
| return FALSE; |
| } |
| |
| |
| /* Redrawing */ |
| |
| /* Paints the hue ring */ |
| static void |
| paint_ring (GtkHSV *hsv, |
| cairo_t *cr) |
| { |
| GtkHSVPrivate *priv = hsv->priv; |
| GtkWidget *widget = GTK_WIDGET (hsv); |
| int xx, yy, width, height; |
| gdouble dx, dy, dist; |
| gdouble center_x; |
| gdouble center_y; |
| gdouble inner, outer; |
| guint32 *buf, *p; |
| gdouble angle; |
| gdouble hue; |
| gdouble r, g, b; |
| cairo_surface_t *source; |
| cairo_t *source_cr; |
| gint stride; |
| |
| width = gtk_widget_get_allocated_width (widget); |
| height = gtk_widget_get_allocated_height (widget); |
| |
| center_x = width / 2.0; |
| center_y = height / 2.0; |
| |
| outer = priv->size / 2.0; |
| inner = outer - priv->ring_width; |
| |
| /* Create an image initialized with the ring colors */ |
| |
| stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width); |
| buf = g_new (guint32, height * stride / 4); |
| |
| for (yy = 0; yy < height; yy++) |
| { |
| p = buf + yy * width; |
| |
| dy = -(yy - center_y); |
| |
| for (xx = 0; xx < width; xx++) |
| { |
| dx = xx - center_x; |
| |
| dist = dx * dx + dy * dy; |
| if (dist < ((inner-1) * (inner-1)) || dist > ((outer+1) * (outer+1))) |
| { |
| *p++ = 0; |
| continue; |
| } |
| |
| angle = atan2 (dy, dx); |
| if (angle < 0.0) |
| angle += 2.0 * G_PI; |
| |
| hue = angle / (2.0 * G_PI); |
| |
| r = hue; |
| g = 1.0; |
| b = 1.0; |
| hsv_to_rgb (&r, &g, &b); |
| |
| *p++ = (((int)floor (r * 255 + 0.5) << 16) | |
| ((int)floor (g * 255 + 0.5) << 8) | |
| (int)floor (b * 255 + 0.5)); |
| } |
| } |
| |
| source = cairo_image_surface_create_for_data ((unsigned char *)buf, |
| CAIRO_FORMAT_RGB24, |
| width, height, stride); |
| |
| /* Now draw the value marker onto the source image, so that it |
| * will get properly clipped at the edges of the ring |
| */ |
| source_cr = cairo_create (source); |
| |
| r = priv->h; |
| g = 1.0; |
| b = 1.0; |
| hsv_to_rgb (&r, &g, &b); |
| |
| if (INTENSITY (r, g, b) > 0.5) |
| cairo_set_source_rgb (source_cr, 0., 0., 0.); |
| else |
| cairo_set_source_rgb (source_cr, 1., 1., 1.); |
| |
| cairo_move_to (source_cr, center_x, center_y); |
| cairo_line_to (source_cr, |
| center_x + cos (priv->h * 2.0 * G_PI) * priv->size / 2, |
| center_y - sin (priv->h * 2.0 * G_PI) * priv->size / 2); |
| cairo_stroke (source_cr); |
| cairo_destroy (source_cr); |
| |
| /* Draw the ring using the source image */ |
| |
| cairo_save (cr); |
| |
| cairo_set_source_surface (cr, source, 0, 0); |
| cairo_surface_destroy (source); |
| |
| cairo_set_line_width (cr, priv->ring_width); |
| cairo_new_path (cr); |
| cairo_arc (cr, |
| center_x, center_y, |
| priv->size / 2. - priv->ring_width / 2., |
| 0, 2 * G_PI); |
| cairo_stroke (cr); |
| |
| cairo_restore (cr); |
| |
| g_free (buf); |
| } |
| |
| /* Converts an HSV triplet to an integer RGB triplet */ |
| static void |
| get_color (gdouble h, |
| gdouble s, |
| gdouble v, |
| gint *r, |
| gint *g, |
| gint *b) |
| { |
| hsv_to_rgb (&h, &s, &v); |
| |
| *r = floor (h * 255 + 0.5); |
| *g = floor (s * 255 + 0.5); |
| *b = floor (v * 255 + 0.5); |
| } |
| |
| #define SWAP(a, b, t) ((t) = (a), (a) = (b), (b) = (t)) |
| |
| #define LERP(a, b, v1, v2, i) (((v2) - (v1) != 0) \ |
| ? ((a) + ((b) - (a)) * ((i) - (v1)) / ((v2) - (v1))) \ |
| : (a)) |
| |
| /* Number of pixels we extend out from the edges when creating |
| * color source to avoid artifacts |
| */ |
| #define PAD 3 |
| |
| /* Paints the HSV triangle */ |
| static void |
| paint_triangle (GtkHSV *hsv, |
| cairo_t *cr, |
| gboolean draw_focus) |
| { |
| GtkHSVPrivate *priv = hsv->priv; |
| GtkWidget *widget = GTK_WIDGET (hsv); |
| gint hx, hy, sx, sy, vx, vy; /* HSV vertices */ |
| gint x1, y1, r1, g1, b1; /* First vertex in scanline order */ |
| gint x2, y2, r2, g2, b2; /* Second vertex */ |
| gint x3, y3, r3, g3, b3; /* Third vertex */ |
| gint t; |
| guint32 *buf, *p, c; |
| gint xl, xr, rl, rr, gl, gr, bl, br; /* Scanline data */ |
| gint xx, yy; |
| gint x_interp, y_interp; |
| gint x_start, x_end; |
| cairo_surface_t *source; |
| gdouble r, g, b; |
| gint stride; |
| int width, height; |
| GtkStyleContext *context; |
| |
| priv = hsv->priv; |
| width = gtk_widget_get_allocated_width (widget); |
| height = gtk_widget_get_allocated_height (widget); |
| /* Compute triangle's vertices */ |
| |
| compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy); |
| |
| x1 = hx; |
| y1 = hy; |
| get_color (priv->h, 1.0, 1.0, &r1, &g1, &b1); |
| |
| x2 = sx; |
| y2 = sy; |
| get_color (priv->h, 1.0, 0.0, &r2, &g2, &b2); |
| |
| x3 = vx; |
| y3 = vy; |
| get_color (priv->h, 0.0, 1.0, &r3, &g3, &b3); |
| |
| if (y2 > y3) |
| { |
| SWAP (x2, x3, t); |
| SWAP (y2, y3, t); |
| SWAP (r2, r3, t); |
| SWAP (g2, g3, t); |
| SWAP (b2, b3, t); |
| } |
| |
| if (y1 > y3) |
| { |
| SWAP (x1, x3, t); |
| SWAP (y1, y3, t); |
| SWAP (r1, r3, t); |
| SWAP (g1, g3, t); |
| SWAP (b1, b3, t); |
| } |
| |
| if (y1 > y2) |
| { |
| SWAP (x1, x2, t); |
| SWAP (y1, y2, t); |
| SWAP (r1, r2, t); |
| SWAP (g1, g2, t); |
| SWAP (b1, b2, t); |
| } |
| |
| /* Shade the triangle */ |
| |
| stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width); |
| buf = g_new (guint32, height * stride / 4); |
| |
| for (yy = 0; yy < height; yy++) |
| { |
| p = buf + yy * width; |
| |
| if (yy >= y1 - PAD && yy < y3 + PAD) { |
| y_interp = CLAMP (yy, y1, y3); |
| |
| if (y_interp < y2) |
| { |
| xl = LERP (x1, x2, y1, y2, y_interp); |
| |
| rl = LERP (r1, r2, y1, y2, y_interp); |
| gl = LERP (g1, g2, y1, y2, y_interp); |
| bl = LERP (b1, b2, y1, y2, y_interp); |
| } |
| else |
| { |
| xl = LERP (x2, x3, y2, y3, y_interp); |
| |
| rl = LERP (r2, r3, y2, y3, y_interp); |
| gl = LERP (g2, g3, y2, y3, y_interp); |
| bl = LERP (b2, b3, y2, y3, y_interp); |
| } |
| |
| xr = LERP (x1, x3, y1, y3, y_interp); |
| |
| rr = LERP (r1, r3, y1, y3, y_interp); |
| gr = LERP (g1, g3, y1, y3, y_interp); |
| br = LERP (b1, b3, y1, y3, y_interp); |
| |
| if (xl > xr) |
| { |
| SWAP (xl, xr, t); |
| SWAP (rl, rr, t); |
| SWAP (gl, gr, t); |
| SWAP (bl, br, t); |
| } |
| |
| x_start = MAX (xl - PAD, 0); |
| x_end = MIN (xr + PAD, width); |
| x_start = MIN (x_start, x_end); |
| |
| c = (rl << 16) | (gl << 8) | bl; |
| |
| for (xx = 0; xx < x_start; xx++) |
| *p++ = c; |
| |
| for (; xx < x_end; xx++) |
| { |
| x_interp = CLAMP (xx, xl, xr); |
| |
| *p++ = ((LERP (rl, rr, xl, xr, x_interp) << 16) | |
| (LERP (gl, gr, xl, xr, x_interp) << 8) | |
| LERP (bl, br, xl, xr, x_interp)); |
| } |
| |
| c = (rr << 16) | (gr << 8) | br; |
| |
| for (; xx < width; xx++) |
| *p++ = c; |
| } |
| } |
| |
| source = cairo_image_surface_create_for_data ((unsigned char *)buf, |
| CAIRO_FORMAT_RGB24, |
| width, height, stride); |
| |
| /* Draw a triangle with the image as a source */ |
| |
| cairo_set_source_surface (cr, source, 0, 0); |
| cairo_surface_destroy (source); |
| |
| cairo_move_to (cr, x1, y1); |
| cairo_line_to (cr, x2, y2); |
| cairo_line_to (cr, x3, y3); |
| cairo_close_path (cr); |
| cairo_fill (cr); |
| |
| g_free (buf); |
| |
| /* Draw value marker */ |
| |
| xx = floor (sx + (vx - sx) * priv->v + (hx - vx) * priv->s * priv->v + 0.5); |
| yy = floor (sy + (vy - sy) * priv->v + (hy - vy) * priv->s * priv->v + 0.5); |
| |
| r = priv->h; |
| g = priv->s; |
| b = priv->v; |
| hsv_to_rgb (&r, &g, &b); |
| |
| context = gtk_widget_get_style_context (widget); |
| |
| gtk_style_context_save (context); |
| |
| if (INTENSITY (r, g, b) > 0.5) |
| { |
| gtk_style_context_add_class (context, "light-area-focus"); |
| cairo_set_source_rgb (cr, 0., 0., 0.); |
| } |
| else |
| { |
| gtk_style_context_add_class (context, "dark-area-focus"); |
| cairo_set_source_rgb (cr, 1., 1., 1.); |
| } |
| |
| #define RADIUS 4 |
| #define FOCUS_RADIUS 6 |
| |
| cairo_new_path (cr); |
| cairo_arc (cr, xx, yy, RADIUS, 0, 2 * G_PI); |
| cairo_stroke (cr); |
| |
| /* Draw focus outline */ |
| |
| if (draw_focus && !priv->focus_on_ring) |
| { |
| gint focus_width; |
| gint focus_pad; |
| |
| gtk_widget_style_get (widget, |
| "focus-line-width", &focus_width, |
| "focus-padding", &focus_pad, |
| NULL); |
| |
| gtk_render_focus (context, cr, |
| xx - FOCUS_RADIUS - focus_width - focus_pad, |
| yy - FOCUS_RADIUS - focus_width - focus_pad, |
| 2 * (FOCUS_RADIUS + focus_width + focus_pad), |
| 2 * (FOCUS_RADIUS + focus_width + focus_pad)); |
| } |
| |
| gtk_style_context_restore (context); |
| } |
| |
| /* Paints the contents of the HSV color selector */ |
| static gboolean |
| gtk_hsv_draw (GtkWidget *widget, |
| cairo_t *cr) |
| { |
| GtkHSV *hsv = GTK_HSV (widget); |
| GtkHSVPrivate *priv = hsv->priv; |
| gboolean draw_focus; |
| |
| draw_focus = gtk_widget_has_visible_focus (widget); |
| |
| paint_ring (hsv, cr); |
| paint_triangle (hsv, cr, draw_focus); |
| |
| |
| if (draw_focus && priv->focus_on_ring) |
| { |
| GtkStyleContext *context; |
| |
| context = gtk_widget_get_style_context (widget); |
| |
| gtk_render_focus (context, cr, 0, 0, |
| gtk_widget_get_allocated_width (widget), |
| gtk_widget_get_allocated_height (widget)); |
| } |
| |
| return FALSE; |
| } |
| |
| static gboolean |
| gtk_hsv_focus (GtkWidget *widget, |
| GtkDirectionType dir) |
| { |
| GtkHSV *hsv = GTK_HSV (widget); |
| GtkHSVPrivate *priv = hsv->priv; |
| |
| if (!gtk_widget_has_focus (widget)) |
| { |
| if (dir == GTK_DIR_TAB_BACKWARD) |
| priv->focus_on_ring = FALSE; |
| else |
| priv->focus_on_ring = TRUE; |
| |
| gtk_widget_grab_focus (GTK_WIDGET (hsv)); |
| return TRUE; |
| } |
| |
| switch (dir) |
| { |
| case GTK_DIR_UP: |
| if (priv->focus_on_ring) |
| return FALSE; |
| else |
| priv->focus_on_ring = TRUE; |
| break; |
| |
| case GTK_DIR_DOWN: |
| if (priv->focus_on_ring) |
| priv->focus_on_ring = FALSE; |
| else |
| return FALSE; |
| break; |
| |
| case GTK_DIR_LEFT: |
| case GTK_DIR_TAB_BACKWARD: |
| if (priv->focus_on_ring) |
| return FALSE; |
| else |
| priv->focus_on_ring = TRUE; |
| break; |
| |
| case GTK_DIR_RIGHT: |
| case GTK_DIR_TAB_FORWARD: |
| if (priv->focus_on_ring) |
| priv->focus_on_ring = FALSE; |
| else |
| return FALSE; |
| break; |
| } |
| |
| gtk_widget_queue_draw (GTK_WIDGET (hsv)); |
| |
| return TRUE; |
| } |
| |
| /** |
| * gtk_hsv_new: |
| * |
| * Creates a new HSV color selector. |
| * |
| * Return value: A newly-created HSV color selector. |
| * |
| * Since: 2.14 |
| */ |
| GtkWidget* |
| gtk_hsv_new (void) |
| { |
| return g_object_new (GTK_TYPE_HSV, NULL); |
| } |
| |
| /** |
| * gtk_hsv_set_color: |
| * @hsv: An HSV color selector |
| * @h: Hue |
| * @s: Saturation |
| * @v: Value |
| * |
| * Sets the current color in an HSV color selector. |
| * Color component values must be in the [0.0, 1.0] range. |
| * |
| * Since: 2.14 |
| */ |
| void |
| gtk_hsv_set_color (GtkHSV *hsv, |
| gdouble h, |
| gdouble s, |
| gdouble v) |
| { |
| GtkHSVPrivate *priv; |
| |
| g_return_if_fail (GTK_IS_HSV (hsv)); |
| g_return_if_fail (h >= 0.0 && h <= 1.0); |
| g_return_if_fail (s >= 0.0 && s <= 1.0); |
| g_return_if_fail (v >= 0.0 && v <= 1.0); |
| |
| priv = hsv->priv; |
| |
| priv->h = h; |
| priv->s = s; |
| priv->v = v; |
| |
| g_signal_emit (hsv, hsv_signals[CHANGED], 0); |
| |
| gtk_widget_queue_draw (GTK_WIDGET (hsv)); |
| } |
| |
| /** |
| * gtk_hsv_get_color: |
| * @hsv: An HSV color selector |
| * @h: (out): Return value for the hue |
| * @s: (out): Return value for the saturation |
| * @v: (out): Return value for the value |
| * |
| * Queries the current color in an HSV color selector. |
| * Returned values will be in the [0.0, 1.0] range. |
| * |
| * Since: 2.14 |
| */ |
| void |
| gtk_hsv_get_color (GtkHSV *hsv, |
| double *h, |
| double *s, |
| double *v) |
| { |
| GtkHSVPrivate *priv; |
| |
| g_return_if_fail (GTK_IS_HSV (hsv)); |
| |
| priv = hsv->priv; |
| |
| if (h) |
| *h = priv->h; |
| |
| if (s) |
| *s = priv->s; |
| |
| if (v) |
| *v = priv->v; |
| } |
| |
| /** |
| * gtk_hsv_set_metrics: |
| * @hsv: An HSV color selector |
| * @size: Diameter for the hue ring |
| * @ring_width: Width of the hue ring |
| * |
| * Sets the size and ring width of an HSV color selector. |
| * |
| * Since: 2.14 |
| */ |
| void |
| gtk_hsv_set_metrics (GtkHSV *hsv, |
| gint size, |
| gint ring_width) |
| { |
| GtkHSVPrivate *priv; |
| int same_size; |
| |
| g_return_if_fail (GTK_IS_HSV (hsv)); |
| g_return_if_fail (size > 0); |
| g_return_if_fail (ring_width > 0); |
| g_return_if_fail (2 * ring_width + 1 <= size); |
| |
| priv = hsv->priv; |
| |
| same_size = (priv->size == size); |
| |
| priv->size = size; |
| priv->ring_width = ring_width; |
| |
| if (same_size) |
| gtk_widget_queue_draw (GTK_WIDGET (hsv)); |
| else |
| gtk_widget_queue_resize (GTK_WIDGET (hsv)); |
| } |
| |
| /** |
| * gtk_hsv_get_metrics: |
| * @hsv: An HSV color selector |
| * @size: (out): Return value for the diameter of the hue ring |
| * @ring_width: (out): Return value for the width of the hue ring |
| * |
| * Queries the size and ring width of an HSV color selector. |
| * |
| * Since: 2.14 |
| */ |
| void |
| gtk_hsv_get_metrics (GtkHSV *hsv, |
| gint *size, |
| gint *ring_width) |
| { |
| GtkHSVPrivate *priv; |
| |
| g_return_if_fail (GTK_IS_HSV (hsv)); |
| |
| priv = hsv->priv; |
| |
| if (size) |
| *size = priv->size; |
| |
| if (ring_width) |
| *ring_width = priv->ring_width; |
| } |
| |
| /** |
| * gtk_hsv_is_adjusting: |
| * @hsv: A #GtkHSV |
| * |
| * An HSV color selector can be said to be adjusting if multiple rapid |
| * changes are being made to its value, for example, when the user is |
| * adjusting the value with the mouse. This function queries whether |
| * the HSV color selector is being adjusted or not. |
| * |
| * Return value: %TRUE if clients can ignore changes to the color value, |
| * since they may be transitory, or %FALSE if they should consider |
| * the color value status to be final. |
| * |
| * Since: 2.14 |
| */ |
| gboolean |
| gtk_hsv_is_adjusting (GtkHSV *hsv) |
| { |
| GtkHSVPrivate *priv; |
| |
| g_return_val_if_fail (GTK_IS_HSV (hsv), FALSE); |
| |
| priv = hsv->priv; |
| |
| return priv->mode != DRAG_NONE; |
| } |
| |
| static void |
| gtk_hsv_move (GtkHSV *hsv, |
| GtkDirectionType dir) |
| { |
| GtkHSVPrivate *priv = hsv->priv; |
| gdouble hue, sat, val; |
| gint hx, hy, sx, sy, vx, vy; /* HSV vertices */ |
| gint x, y; /* position in triangle */ |
| |
| hue = priv->h; |
| sat = priv->s; |
| val = priv->v; |
| |
| compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy); |
| |
| x = floor (sx + (vx - sx) * priv->v + (hx - vx) * priv->s * priv->v + 0.5); |
| y = floor (sy + (vy - sy) * priv->v + (hy - vy) * priv->s * priv->v + 0.5); |
| |
| #define HUE_DELTA 0.002 |
| switch (dir) |
| { |
| case GTK_DIR_UP: |
| if (priv->focus_on_ring) |
| hue += HUE_DELTA; |
| else |
| { |
| y -= 1; |
| compute_sv (hsv, x, y, &sat, &val); |
| } |
| break; |
| |
| case GTK_DIR_DOWN: |
| if (priv->focus_on_ring) |
| hue -= HUE_DELTA; |
| else |
| { |
| y += 1; |
| compute_sv (hsv, x, y, &sat, &val); |
| } |
| break; |
| |
| case GTK_DIR_LEFT: |
| if (priv->focus_on_ring) |
| hue += HUE_DELTA; |
| else |
| { |
| x -= 1; |
| compute_sv (hsv, x, y, &sat, &val); |
| } |
| break; |
| |
| case GTK_DIR_RIGHT: |
| if (priv->focus_on_ring) |
| hue -= HUE_DELTA |
| ; |
| else |
| { |
| x += 1; |
| compute_sv (hsv, x, y, &sat, &val); |
| } |
| break; |
| |
| default: |
| /* we don't care about the tab directions */ |
| break; |
| } |
| |
| /* Wrap */ |
| if (hue < 0.0) |
| hue = 1.0; |
| else if (hue > 1.0) |
| hue = 0.0; |
| |
| gtk_hsv_set_color (hsv, hue, sat, val); |
| } |
| |
