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gtk2/gtk/gtkhsv.c
Havoc Pennington 74e7da214f geez, don't call g_list funcs on GSList 
2001-06-08  Havoc Pennington  <hp@redhat.com>

	* gtk/gtktextbuffer.c (gtk_text_buffer_remove_all_tags): geez,
	don't call g_list funcs on GSList

	* gtk/gtkwidget.c (gtk_widget_child_focus): replaces
	gtk_container_focus(), since some widgets have focusable locations
	which are not other widgets. These widgets should not have to be
	containers just to manage the focus. For example, GtkHSV is
	currently a container for no good reason. Also, this cleans
	up the "if (is_container && is_sensitive && is_drawable)
	container_focus ()" mess in widget implementations.

	* gtk/gtkcontainer.c (gtk_container_focus): deprecate this
	function, and have it just call gtk_widget_child_focus().

	* gtk/gtkhsv.c: derive from widget not container

	Throughout: fix to reflect GtkContainer::focus change
2001-06-08 18:09:34 +00:00

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/* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <math.h>
#include "gtksignal.h"
#include "gtkhsv.h"
#include "gdk/gdkkeysyms.h"
#include "gtkbindings.h"
#include "gtkcontainer.h"
/*
* 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/.
*/
/* 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 */
typedef struct {
/* Color value */
double h;
double s;
double v;
/* Size and ring width */
int size;
int ring_width;
/* Window for capturing events */
GdkWindow *window;
/* GC for drawing */
GdkGC *gc;
/* Dragging mode */
DragMode mode;
guint focus_on_ring : 1;
} HSVPrivate;
/* Signal IDs */
enum {
CHANGED,
MOVE,
LAST_SIGNAL
};
static void gtk_hsv_class_init (GtkHSVClass *class);
static void gtk_hsv_init (GtkHSV *hsv);
static void gtk_hsv_destroy (GtkObject *object);
static void gtk_hsv_map (GtkWidget *widget);
static void gtk_hsv_unmap (GtkWidget *widget);
static void gtk_hsv_realize (GtkWidget *widget);
static void gtk_hsv_unrealize (GtkWidget *widget);
static void gtk_hsv_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gtk_hsv_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gint gtk_hsv_button_press (GtkWidget *widget,
GdkEventButton *event);
static gint gtk_hsv_button_release (GtkWidget *widget,
GdkEventButton *event);
static gint gtk_hsv_motion (GtkWidget *widget,
GdkEventMotion *event);
static gint gtk_hsv_expose (GtkWidget *widget,
GdkEventExpose *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];
static GtkWidgetClass *parent_class;
/**
* gtk_hsv_get_type:
* @void:
*
* Registers the &GtkHSV class if necessary, and returns the type ID associated
* to it.
*
* Return value: The type ID of the &GtkHSV class.
**/
GtkType
gtk_hsv_get_type (void)
{
static GtkType hsv_type = 0;
if (!hsv_type) {
static const GtkTypeInfo hsv_info = {
"GtkHSV",
sizeof (GtkHSV),
sizeof (GtkHSVClass),
(GtkClassInitFunc) gtk_hsv_class_init,
(GtkObjectInitFunc) gtk_hsv_init,
NULL, /* reserved_1 */
NULL, /* reserved_2 */
(GtkClassInitFunc) NULL
};
hsv_type = gtk_type_unique (GTK_TYPE_WIDGET, &hsv_info);
}
return hsv_type;
}
/* Class initialization function for the HSV color selector */
static void
gtk_hsv_class_init (GtkHSVClass *class)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
GtkHSVClass *hsv_class;
GtkBindingSet *binding_set;
object_class = (GtkObjectClass *) class;
widget_class = (GtkWidgetClass *) class;
hsv_class = GTK_HSV_CLASS (class);
parent_class = gtk_type_class (GTK_TYPE_WIDGET);
object_class->destroy = gtk_hsv_destroy;
widget_class->map = gtk_hsv_map;
widget_class->unmap = gtk_hsv_unmap;
widget_class->realize = gtk_hsv_realize;
widget_class->unrealize = gtk_hsv_unrealize;
widget_class->size_request = gtk_hsv_size_request;
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->expose_event = gtk_hsv_expose;
widget_class->focus = gtk_hsv_focus;
hsv_class->move = gtk_hsv_move;
hsv_signals[CHANGED] =
gtk_signal_new ("changed",
GTK_RUN_FIRST,
GTK_CLASS_TYPE (object_class),
GTK_SIGNAL_OFFSET (GtkHSVClass, changed),
gtk_marshal_VOID__VOID,
GTK_TYPE_NONE, 0);
hsv_signals[MOVE] =
gtk_signal_new ("move",
GTK_RUN_LAST | GTK_RUN_ACTION,
GTK_CLASS_TYPE (object_class),
GTK_SIGNAL_OFFSET (GtkHSVClass, move),
gtk_marshal_VOID__ENUM,
GTK_TYPE_NONE, 1, GTK_TYPE_DIRECTION_TYPE);
binding_set = gtk_binding_set_by_class (class);
gtk_binding_entry_add_signal (binding_set, GDK_Up, 0,
"move", 1,
GTK_TYPE_ENUM, GTK_DIR_UP);
gtk_binding_entry_add_signal (binding_set, GDK_KP_Up, 0,
"move", 1,
GTK_TYPE_ENUM, GTK_DIR_UP);
gtk_binding_entry_add_signal (binding_set, GDK_Down, 0,
"move", 1,
GTK_TYPE_ENUM, GTK_DIR_DOWN);
gtk_binding_entry_add_signal (binding_set, GDK_KP_Down, 0,
"move", 1,
GTK_TYPE_ENUM, GTK_DIR_DOWN);
gtk_binding_entry_add_signal (binding_set, GDK_Right, 0,
"move", 1,
GTK_TYPE_ENUM, GTK_DIR_RIGHT);
gtk_binding_entry_add_signal (binding_set, GDK_KP_Right, 0,
"move", 1,
GTK_TYPE_ENUM, GTK_DIR_RIGHT);
gtk_binding_entry_add_signal (binding_set, GDK_Left, 0,
"move", 1,
GTK_TYPE_ENUM, GTK_DIR_LEFT);
gtk_binding_entry_add_signal (binding_set, GDK_KP_Left, 0,
"move", 1,
GTK_TYPE_ENUM, GTK_DIR_LEFT);
}
/* Object initialization function for the HSV color selector */
static void
gtk_hsv_init (GtkHSV *hsv)
{
HSVPrivate *priv;
priv = g_new0 (HSVPrivate, 1);
hsv->priv = priv;
GTK_WIDGET_SET_FLAGS (hsv, GTK_NO_WINDOW);
GTK_WIDGET_SET_FLAGS (hsv, GTK_CAN_FOCUS);
priv->h = 0.0;
priv->s = 0.0;
priv->v = 0.0;
priv->size = DEFAULT_SIZE;
priv->ring_width = DEFAULT_RING_WIDTH;
}
/* Destroy handler for the HSV color selector */
static void
gtk_hsv_destroy (GtkObject *object)
{
GtkHSV *hsv;
g_return_if_fail (GTK_IS_HSV (object));
hsv = GTK_HSV (object);
if (hsv->priv)
{
g_free (hsv->priv);
hsv->priv = NULL;
}
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
/* Default signal handlers */
/* Map handler for the HSV color selector */
static void
gtk_hsv_map (GtkWidget *widget)
{
GtkHSV *hsv;
HSVPrivate *priv;
hsv = GTK_HSV (widget);
priv = hsv->priv;
if (GTK_WIDGET_MAPPED (widget))
return;
GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
gdk_window_show (priv->window);
}
/* Unmap handler for the HSV color selector */
static void
gtk_hsv_unmap (GtkWidget *widget)
{
GtkHSV *hsv;
HSVPrivate *priv;
hsv = GTK_HSV (widget);
priv = hsv->priv;
if (!GTK_WIDGET_MAPPED (widget))
return;
GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
gdk_window_hide (priv->window);
}
/* Realize handler for the HSV color selector */
static void
gtk_hsv_realize (GtkWidget *widget)
{
GtkHSV *hsv;
HSVPrivate *priv;
GdkWindowAttr attr;
int attr_mask;
GdkWindow *parent_window;
hsv = GTK_HSV (widget);
priv = hsv->priv;
GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
/* Create window */
attr.window_type = GDK_WINDOW_CHILD;
attr.x = widget->allocation.x;
attr.y = widget->allocation.y;
attr.width = widget->allocation.width;
attr.height = widget->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);
widget->window = parent_window;
gdk_window_ref (widget->window);
priv->window = gdk_window_new (parent_window, &attr, attr_mask);
gdk_window_set_user_data (priv->window, hsv);
widget->style = gtk_style_attach (widget->style, widget->window);
/* Create GC */
priv->gc = gdk_gc_new (parent_window);
}
/* Unrealize handler for the HSV color selector */
static void
gtk_hsv_unrealize (GtkWidget *widget)
{
GtkHSV *hsv;
HSVPrivate *priv;
hsv = GTK_HSV (widget);
priv = hsv->priv;
gdk_window_set_user_data (priv->window, NULL);
gdk_window_destroy (priv->window);
priv->window = NULL;
gdk_gc_unref (priv->gc);
priv->gc = NULL;
if (GTK_WIDGET_CLASS (parent_class)->unrealize)
GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
}
/* Size_request handler for the HSV color selector */
static void
gtk_hsv_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkHSV *hsv;
HSVPrivate *priv;
hsv = GTK_HSV (widget);
priv = hsv->priv;
requisition->width = priv->size;
requisition->height = priv->size;
}
/* Size_allocate handler for the HSV color selector */
static void
gtk_hsv_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkHSV *hsv;
HSVPrivate *priv;
hsv = GTK_HSV (widget);
priv = hsv->priv;
widget->allocation = *allocation;
if (GTK_WIDGET_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 ();
}
}
}
/* Converts from RGB to HSV */
static void
rgb_to_hsv (gdouble *r,
gdouble *g,
gdouble *b)
{
gdouble red, green, blue;
gdouble h, s, v;
gdouble min, max;
gdouble delta;
red = *r;
green = *g;
blue = *b;
h = 0.0;
if (red > green)
{
if (red > blue)
max = red;
else
max = blue;
if (green < blue)
min = green;
else
min = blue;
}
else
{
if (green > blue)
max = green;
else
max = blue;
if (red < blue)
min = red;
else
min = blue;
}
v = max;
if (max != 0.0)
s = (max - min) / max;
else
s = 0.0;
if (s == 0.0)
h = 0.0;
else
{
delta = max - min;
if (red == max)
h = (green - blue) / delta;
else if (green == max)
h = 2 + (blue - red) / delta;
else if (blue == max)
h = 4 + (red - green) / delta;
h /= 6.0;
if (h < 0.0)
h += 1.0;
else if (h > 1.0)
h -= 1.0;
}
*r = h;
*g = s;
*b = v;
}
/* 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)
{
HSVPrivate *priv;
gdouble center;
gdouble inner, outer;
gdouble angle;
priv = hsv->priv;
center = priv->size / 2.0;
outer = priv->size / 2.0;
inner = outer - priv->ring_width;
angle = priv->h * 2.0 * G_PI;
*hx = floor (center + cos (angle) * inner + 0.5);
*hy = floor (center - sin (angle) * inner + 0.5);
*sx = floor (center + cos (angle + 2.0 * G_PI / 3.0) * inner + 0.5);
*sy = floor (center - sin (angle + 2.0 * G_PI / 3.0) * inner + 0.5);
*vx = floor (center + cos (angle + 4.0 * G_PI / 3.0) * inner + 0.5);
*vy = floor (center - 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)
{
HSVPrivate *priv;
gdouble dx, dy, dist;
gdouble center, inner, outer;
priv = hsv->priv;
center = priv->size / 2.0;
outer = priv->size / 2.0;
inner = outer - priv->ring_width;
dx = x - center;
dy = center - 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)
{
HSVPrivate *priv;
int ihx, ihy, isx, isy, ivx, ivy;
double hx, hy, sx, sy, vx, vy;
double center;
priv = hsv->priv;
compute_triangle (hsv, &ihx, &ihy, &isx, &isy, &ivx, &ivy);
center = priv->size / 2.0;
hx = ihx - center;
hy = center - ihy;
sx = isx - center;
sy = center - isy;
vx = ivx - center;
vy = center - ivy;
x -= center;
y = center - 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)
{
HSVPrivate *priv;
double center;
double dx, dy;
double angle;
priv = hsv->priv;
center = priv->size / 2.0;
dx = x - center;
dy = center - 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,
guint32 time)
{
HSVPrivate *priv;
GdkCursor *cursor;
priv = hsv->priv;
cursor = gdk_cursor_new (GDK_CROSSHAIR);
gdk_pointer_grab (priv->window, FALSE,
(GDK_POINTER_MOTION_MASK
| GDK_POINTER_MOTION_HINT_MASK
| GDK_BUTTON_RELEASE_MASK),
NULL,
cursor,
time);
gdk_cursor_destroy (cursor);
}
/* Button_press_event handler for the HSV color selector */
static gint
gtk_hsv_button_press (GtkWidget *widget,
GdkEventButton *event)
{
GtkHSV *hsv;
HSVPrivate *priv;
double x, y;
hsv = GTK_HSV (widget);
priv = hsv->priv;
if (priv->mode != DRAG_NONE || event->button != 1)
return FALSE;
x = event->x;
y = event->y;
if (is_in_ring (hsv, x, y))
{
priv->mode = DRAG_H;
set_cross_grab (hsv, 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, 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;
}
/* Button_release_event handler for the HSV color selector */
static gint
gtk_hsv_button_release (GtkWidget *widget,
GdkEventButton *event)
{
GtkHSV *hsv;
HSVPrivate *priv;
DragMode mode;
gdouble x, y;
hsv = GTK_HSV (widget);
priv = hsv->priv;
if (priv->mode == DRAG_NONE || event->button != 1)
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) {
double s, v;
compute_sv (hsv, x, y, &s, &v);
gtk_hsv_set_color (hsv, priv->h, s, v);
} else
g_assert_not_reached ();
gdk_pointer_ungrab (event->time);
return TRUE;
}
/* Motion_notify_event handler for the HSV color selector */
static gint
gtk_hsv_motion (GtkWidget *widget,
GdkEventMotion *event)
{
GtkHSV *hsv;
HSVPrivate *priv;
double x, y;
gint ix, iy;
GdkModifierType mods;
hsv = GTK_HSV (widget);
priv = hsv->priv;
if (priv->mode == DRAG_NONE)
return FALSE;
if (event->is_hint)
{
gdk_window_get_pointer (priv->window, &ix, &iy, &mods);
x = ix;
y = iy;
}
else
{
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)
{
double 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,
GdkDrawable *drawable,
gint x,
gint y,
gint width,
gint height)
{
HSVPrivate *priv;
int xx, yy;
gdouble dx, dy, dist;
gdouble center;
gdouble inner, outer;
guchar *buf, *p;
gdouble angle;
gdouble hue;
gdouble r, g, b;
GdkBitmap *mask;
GdkGC *gc;
GdkColor color;
priv = hsv->priv;
center = priv->size / 2.0;
outer = priv->size / 2.0;
inner = outer - priv->ring_width;
/* Paint the ring */
buf = g_new (guchar, width * height * 3);
for (yy = 0; yy < height; yy++)
{
p = buf + yy * width * 3;
dy = -(yy + y - center);
for (xx = 0; xx < width; xx++)
{
dx = xx + x - center;
dist = dx * dx + dy * dy;
if (dist < ((inner-1) * (inner-1)) || dist > ((outer+1) * (outer+1)))
{
*p++ = 0;
*p++ = 0;
*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++ = floor (r * 255 + 0.5);
*p++ = floor (g * 255 + 0.5);
*p++ = floor (b * 255 + 0.5);
}
}
/* Create clipping mask */
mask = gdk_pixmap_new (NULL, width, height, 1);
gc = gdk_gc_new (mask);
color.pixel = 0;
gdk_gc_set_foreground (gc, &color);
gdk_draw_rectangle (mask, gc, TRUE,
0, 0, width, height);
color.pixel = 1;
gdk_gc_set_foreground (gc, &color);
gdk_draw_arc (mask, gc, TRUE,
-x, -y,
priv->size - 1, priv->size - 1,
0, 360 * 64);
color.pixel = 0;
gdk_gc_set_foreground (gc, &color);
gdk_draw_arc (mask, gc, TRUE,
-x + priv->ring_width - 1, -y + priv->ring_width - 1,
priv->size - 2 * priv->ring_width + 1, priv->size - 2 * priv->ring_width + 1,
0, 360 * 64);
gdk_gc_unref (gc);
gdk_gc_set_clip_mask (priv->gc, mask);
gdk_gc_set_clip_origin (priv->gc, 0, 0);
/* Draw ring */
gdk_draw_rgb_image_dithalign (drawable, priv->gc, 0, 0, width, height,
GDK_RGB_DITHER_MAX,
buf,
width * 3,
x, y);
/* Draw value marker */
r = priv->h;
g = 1.0;
b = 1.0;
hsv_to_rgb (&r, &g, &b);
if (INTENSITY (r, g, b) > 0.5)
gdk_rgb_gc_set_foreground (priv->gc, 0x000000);
else
gdk_rgb_gc_set_foreground (priv->gc, 0xffffff);
gdk_draw_line (drawable, priv->gc,
-x + center, -y + center,
-x + center + cos (priv->h * 2.0 * G_PI) * center,
-y + center - sin (priv->h * 2.0 * G_PI) * center);
gdk_gc_set_clip_mask (priv->gc, NULL);
gdk_bitmap_unref (mask);
g_free (buf);
/* Draw ring outline */
if (GTK_WIDGET_HAS_FOCUS (hsv) &&
priv->focus_on_ring)
{
gdk_rgb_gc_set_foreground (priv->gc, 0x000000);
gdk_draw_arc (drawable, priv->gc, FALSE,
-x, -y,
priv->size - 1, priv->size - 1,
0, 360 * 64);
gdk_draw_arc (drawable, priv->gc, FALSE,
-x + priv->ring_width - 1, -y + priv->ring_width - 1,
priv->size - 2 * priv->ring_width + 1, priv->size - 2 * priv->ring_width + 1,
0, 360 * 64);
}
}
/* 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))
/* Paints the HSV triangle */
static void
paint_triangle (GtkHSV *hsv,
GdkDrawable *drawable,
gint x,
gint y,
gint width,
gint height)
{
HSVPrivate *priv;
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;
guchar *buf, *p;
gint xl, xr, rl, rr, gl, gr, bl, br; /* Scanline data */
gint xx, yy;
GdkBitmap *mask;
GdkGC *gc;
GdkColor color;
GdkPoint points[3];
gdouble r, g, b;
priv = hsv->priv;
/* 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 */
buf = g_new (guchar, width * height * 3);
for (yy = 0; yy < height; yy++)
{
p = buf + yy * width * 3;
if (yy + y < y1 || yy + y > y3)
for (xx = 0; xx < width; xx++)
{
*p++ = 0;
*p++ = 0;
*p++ = 0;
}
else {
if (yy + y < y2)
{
xl = LERP (x1, x2, y1, y2, yy + y);
rl = LERP (r1, r2, y1, y2, yy + y);
gl = LERP (g1, g2, y1, y2, yy + y);
bl = LERP (b1, b2, y1, y2, yy + y);
}
else
{
xl = LERP (x2, x3, y2, y3, yy + y);
rl = LERP (r2, r3, y2, y3, yy + y);
gl = LERP (g2, g3, y2, y3, yy + y);
bl = LERP (b2, b3, y2, y3, yy + y);
}
xr = LERP (x1, x3, y1, y3, yy + y);
rr = LERP (r1, r3, y1, y3, yy + y);
gr = LERP (g1, g3, y1, y3, yy + y);
br = LERP (b1, b3, y1, y3, yy + y);
if (xl > xr)
{
SWAP (xl, xr, t);
SWAP (rl, rr, t);
SWAP (gl, gr, t);
SWAP (bl, br, t);
}
for (xx = 0; xx < width; xx++)
{
if (xx + x < xl || xx + x > xr)
{
*p++ = 0;
*p++ = 0;
*p++ = 0;
}
else
{
*p++ = LERP (rl, rr, xl, xr, xx + x);
*p++ = LERP (gl, gr, xl, xr, xx + x);
*p++ = LERP (bl, br, xl, xr, xx + x);
}
}
}
}
/* Create clipping mask */
mask = gdk_pixmap_new (NULL, width, height, 1);
gc = gdk_gc_new (mask);
color.pixel = 0;
gdk_gc_set_foreground (gc, &color);
gdk_draw_rectangle (mask, gc, TRUE,
0, 0, width, height);
color.pixel = 1;
gdk_gc_set_foreground (gc, &color);
points[0].x = x1 - x;
points[0].y = y1 - y;
points[1].x = x2 - x;
points[1].y = y2 - y;
points[2].x = x3 - x;
points[2].y = y3 - y;
gdk_draw_polygon (mask, gc, TRUE, points, 3);
gdk_gc_unref (gc);
gdk_gc_set_clip_mask (priv->gc, mask);
gdk_gc_set_clip_origin (priv->gc, 0, 0);
/* Draw triangle */
gdk_draw_rgb_image_dithalign (drawable, priv->gc, 0, 0, width, height,
GDK_RGB_DITHER_MAX,
buf,
width * 3,
x, y);
gdk_gc_set_clip_mask (priv->gc, NULL);
gdk_bitmap_unref (mask);
g_free (buf);
/* Draw triangle focus outline */
if (GTK_WIDGET_HAS_FOCUS (hsv) &&
!priv->focus_on_ring)
{
gdk_rgb_gc_set_foreground (priv->gc, 0x000000);
gdk_draw_polygon (drawable, priv->gc, FALSE, points, 3);
}
/* Draw value marker */
xx = floor (sx + (vx - sx) * priv->v + (hx - vx) * priv->s * priv->v + 0.5) - x;
yy = floor (sy + (vy - sy) * priv->v + (hy - vy) * priv->s * priv->v + 0.5) - y;
r = priv->h;
g = priv->s;
b = priv->v;
hsv_to_rgb (&r, &g, &b);
if (INTENSITY (r, g, b) > 0.5)
gdk_rgb_gc_set_foreground (priv->gc, 0x000000);
else
gdk_rgb_gc_set_foreground (priv->gc, 0xffffff);
#define OUTER_RADIUS 4
#define INNER_RADIUS 3
gdk_draw_arc (drawable, priv->gc, FALSE,
xx - OUTER_RADIUS, yy - OUTER_RADIUS,
OUTER_RADIUS * 2, OUTER_RADIUS * 2,
0, 360 * 64);
gdk_draw_arc (drawable, priv->gc, FALSE,
xx - INNER_RADIUS, yy - INNER_RADIUS,
INNER_RADIUS * 2, INNER_RADIUS * 2,
0, 360 * 64);
}
/* Paints the contents of the HSV color selector */
static void
paint (GtkHSV *hsv,
GdkDrawable *drawable,
gint x,
gint y,
gint width,
gint height)
{
paint_ring (hsv, drawable, x, y, width, height);
paint_triangle (hsv, drawable, x, y, width, height);
}
/* Expose_event handler for the HSV color selector */
static gint
gtk_hsv_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GtkHSV *hsv;
HSVPrivate *priv;
GdkRectangle rect, dest;
GdkPixmap *pixmap;
hsv = GTK_HSV (widget);
priv = hsv->priv;
if (!(GTK_WIDGET_DRAWABLE (widget) && event->window == widget->window))
return FALSE;
rect.x = widget->allocation.x;
rect.y = widget->allocation.y;
rect.width = widget->allocation.width;
rect.height = widget->allocation.height;
if (!gdk_rectangle_intersect (&event->area, &rect, &dest))
return FALSE;
pixmap = gdk_pixmap_new (widget->window, dest.width, dest.height,
gtk_widget_get_visual (widget)->depth);
rect = dest;
rect.x = 0;
rect.y = 0;
gdk_draw_rectangle (pixmap,
widget->style->bg_gc[GTK_WIDGET_STATE (widget)],
TRUE,
0, 0, dest.width, dest.height);
paint (hsv, pixmap,
dest.x - widget->allocation.x, dest.y - widget->allocation.y,
dest.width, dest.height);
gdk_draw_pixmap (widget->window,
priv->gc,
pixmap,
0, 0,
dest.x,
dest.y,
event->area.width, event->area.height);
gdk_pixmap_unref (pixmap);
return FALSE;
}
static gboolean
gtk_hsv_focus (GtkWidget *widget,
GtkDirectionType dir)
{
GtkHSV *hsv;
HSVPrivate *priv;
hsv = GTK_HSV (widget);
priv = hsv->priv;
if (!GTK_WIDGET_HAS_FOCUS (hsv))
{
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:
* @void:
*
* Creates a new HSV color selector.
*
* Return value: A newly-created HSV color selector.
**/
GtkWidget*
gtk_hsv_new (void)
{
return GTK_WIDGET (gtk_type_new (GTK_TYPE_HSV));
}
/**
* 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.
**/
void
gtk_hsv_set_color (GtkHSV *hsv,
gdouble h,
gdouble s,
gdouble v)
{
HSVPrivate *priv;
g_return_if_fail (hsv != NULL);
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;
gtk_signal_emit (GTK_OBJECT (hsv), hsv_signals[CHANGED]);
gtk_widget_queue_draw (GTK_WIDGET (hsv));
}
/**
* gtk_hsv_get_color:
* @hsv: An HSV color selector.
* @h: Return value for the hue.
* @s: Return value for the saturation.
* @v: 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.
**/
void
gtk_hsv_get_color (GtkHSV *hsv, double *h, double *s, double *v)
{
HSVPrivate *priv;
g_return_if_fail (hsv != NULL);
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.
**/
void
gtk_hsv_set_metrics (GtkHSV *hsv,
gint size,
gint ring_width)
{
HSVPrivate *priv;
int same_size;
g_return_if_fail (hsv != NULL);
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: Return value for the diameter of the hue ring.
* @ring_width: Return value for the width of the hue ring.
*
* Queries the size and ring width of an HSV color selector.
**/
void
gtk_hsv_get_metrics (GtkHSV *hsv,
gint *size,
gint *ring_width)
{
HSVPrivate *priv;
g_return_if_fail (hsv != NULL);
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:
*
* 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.
**/
gboolean
gtk_hsv_is_adjusting (GtkHSV *hsv)
{
HSVPrivate *priv;
g_return_val_if_fail (hsv != NULL, FALSE);
g_return_val_if_fail (GTK_IS_HSV (hsv), FALSE);
priv = hsv->priv;
return priv->mode != DRAG_NONE;
}
/**
* gtk_hsv_to_rgb:
* @h: Hue.
* @s: Saturation.
* @v: Value.
* @r: Return value for the red component.
* @g: Return value for the green component.
* @b: Return value for the blue component.
*
* Converts a color from HSV space to RGB. Input values must be in the
* [0.0, 1.0] range; output values will be in the same range.
**/
void
gtk_hsv_to_rgb (gdouble h,
gdouble s,
gdouble v,
gdouble *r,
gdouble *g,
gdouble *b)
{
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);
hsv_to_rgb (&h, &s, &v);
if (r)
*r = h;
if (g)
*g = s;
if (b)
*b = v;
}
/**
* gtk_hsv_to_rgb:
* @r: Red.
* @g: Green.
* @b: Blue.
* @h: Return value for the hue component.
* @s: Return value for the saturation component.
* @v: Return value for the value component.
*
* Converts a color from RGB space to HSV. Input values must be in the
* [0.0, 1.0] range; output values will be in the same range.
**/
void
gtk_rgb_to_hsv (gdouble r,
gdouble g,
gdouble b,
gdouble *h,
gdouble *s,
gdouble *v)
{
g_return_if_fail (r >= 0.0 && r <= 1.0);
g_return_if_fail (g >= 0.0 && g <= 1.0);
g_return_if_fail (b >= 0.0 && b <= 1.0);
rgb_to_hsv (&r, &g, &b);
if (h)
*h = r;
if (s)
*s = g;
if (v)
*v = b;
}
static void
gtk_hsv_move (GtkHSV *hsv,
GtkDirectionType dir)
{
HSVPrivate *priv;
gdouble hue, sat, val;
gint hx, hy, sx, sy, vx, vy; /* HSV vertices */
gint x, y; /* position in triangle */
priv = hsv->priv;
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);
}
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