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gimp/modules/colorsel_triangle.c

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/*
* colorsel_triangle module (C) 1999 Simon Budig <Simon.Budig@unix-ag.org>
* http://www.home.unix-ag.org/simon/gimp/colorsel.html
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Ported to loadable colour selector interface by Austin Donnelly
* <austin@gimp.org>
*
*/
#include <stdio.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include <libgimp/color_selector.h>
#include <libgimp/gimpmodule.h>
#include <math.h>
/* prototypes */
static GtkWidget * colorsel_triangle_new (int, int, int,
GimpColorSelector_Callback, void *,
void **);
static void colorsel_triangle_free (void *);
static void colorsel_triangle_setcolor (void *, int, int, int, int);
/* local methods */
static GimpColorSelectorMethods methods =
{
colorsel_triangle_new,
colorsel_triangle_free,
colorsel_triangle_setcolor
};
static GimpModuleInfo info = {
NULL,
"Painter-style colour selector as a pluggable colour selector",
"Simon Budig <Simon.Budig@unix-ag.org>",
"v0.01",
"(c) 1999, released under the GPL",
"17 Jan 1999"
};
#define COLORWHEELRADIUS 100
#define COLORTRIANGLERADIUS 80
#define PREVIEWSIZE (2*COLORWHEELRADIUS+1)
#define INTENSITY(r,g,b) (r * 0.30 + g * 0.59 + b * 0.11 + 0.001)
#define BGCOLOR 180
#define PREVIEW_MASK GDK_EXPOSURE_MASK | \
GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK | \
GDK_BUTTON_MOTION_MASK
typedef enum {
HUE = 0,
SATURATION,
VALUE,
RED,
GREEN,
BLUE,
HUE_SATURATION,
HUE_VALUE,
SATURATION_VALUE,
RED_GREEN,
RED_BLUE,
GREEN_BLUE
} ColorSelectFillType;
typedef struct _ColorSelect _ColorSelect, *ColorSelectP;
struct _ColorSelect {
gint values[6];
gfloat oldsat;
gfloat oldval;
gint mode;
GtkWidget *preview;
GimpColorSelector_Callback callback;
void *data;
};
static GtkWidget * create_color_preview (ColorSelectP);
static void color_select_update_rgb_values (ColorSelectP);
static void update_color_preview (ColorSelectP, GtkWidget *, gint);
static void color_select_update_hsv_values (ColorSelectP);
/*************************************************************/
/* globaly exported init function */
G_MODULE_EXPORT GimpModuleStatus
module_init (GimpModuleInfo **inforet)
{
GimpColorSelectorID id;
id = gimp_color_selector_register ("Triangle", &methods);
if (id)
{
info.shutdown_data = id;
*inforet = &info;
return GIMP_MODULE_OK;
}
else
{
return GIMP_MODULE_UNLOAD;
}
}
G_MODULE_EXPORT void
module_unload (void *shutdown_data,
void (*completed_cb)(void *),
void *completed_data)
{
gimp_color_selector_unregister (shutdown_data, completed_cb, completed_data);
}
/*************************************************************/
/* methods */
static GtkWidget * colorsel_triangle_new (int r, int g, int b,
GimpColorSelector_Callback callback,
void *callback_data,
/* RETURNS: */
void **selector_data)
{
ColorSelectP coldata;
GtkWidget *preview;
GtkWidget *frame;
GtkWidget *hbox;
GtkWidget *vbox;
coldata = g_malloc (sizeof (_ColorSelect));
coldata->values[RED] = r;
coldata->values[GREEN] = g;
coldata->values[BLUE] = b;
color_select_update_hsv_values(coldata);
coldata->oldsat = 0;
coldata->oldval = 0;
coldata->mode = 0;
coldata->callback = callback;
coldata->data = callback_data;
preview = create_color_preview (coldata);
coldata->preview = preview;
*selector_data = coldata;
vbox = gtk_vbox_new (FALSE, 0);
hbox = gtk_hbox_new (FALSE, 0);
gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, FALSE, 0);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_container_add (GTK_CONTAINER (frame), preview);
gtk_box_pack_start (GTK_BOX (hbox), frame, TRUE, FALSE, 0);
gtk_widget_show_all (hbox);
return vbox;
}
static void
colorsel_triangle_free (void *selector_data)
{
/* anything else needed to go? */
g_free (selector_data);
}
static void
colorsel_triangle_setcolor (void *selector_data, int r, int g, int b,
int set_current)
{
ColorSelectP coldata;
coldata = selector_data;
coldata->values[RED] = r;
coldata->values[GREEN] = g;
coldata->values[BLUE] = b;
color_select_update_hsv_values(coldata);
update_color_preview(coldata, coldata->preview, 1);
}
/*************************************************************/
/* helper functions */
/* Conversion hsv->rgb */
static void color_hsv_to_rgb (gfloat hue, gfloat sat, gfloat val, guchar* red, guchar *green, guchar *blue) {
gfloat f, p, q, t;
if (sat == 0) {
*red = val * 255;
*green = val * 255;
*blue = val * 255;
} else {
while (hue < 0)
hue += 360;
while (hue >= 360)
hue -= 360;
hue /= 60;
f = hue - (int) hue;
p = val * (1 - sat);
q = val * (1 - (sat * f));
t = val * (1 - (sat * (1 - f)));
switch ((int) hue) {
case 0:
*red = val * 255;
*green = t * 255;
*blue = p * 255;
break;
case 1:
*red = q * 255;
*green = val * 255;
*blue = p * 255;
break;
case 2:
*red = p * 255;
*green = val * 255;
*blue = t * 255;
break;
case 3:
*red = p * 255;
*green = q * 255;
*blue = val * 255;
break;
case 4:
*red = t * 255;
*green = p * 255;
*blue = val * 255;
break;
case 5:
*red = val * 255;
*green = p * 255;
*blue = q * 255;
break;
default:
break;
}
}
}
static void color_select_update_rgb_values (ColorSelectP csp) {
gfloat h, s, v;
gfloat f, p, q, t;
if (csp)
{
h = csp->values[HUE];
s = csp->values[SATURATION] / 100.0;
v = csp->values[VALUE] / 100.0;
if (s == 0)
{
csp->values[RED] = v * 255;
csp->values[GREEN] = v * 255;
csp->values[BLUE] = v * 255;
}
else
{
if (h == 360)
h = 0;
h /= 60;
f = h - (int) h;
p = v * (1 - s);
q = v * (1 - (s * f));
t = v * (1 - (s * (1 - f)));
switch ((int) h)
{
case 0:
csp->values[RED] = v * 255;
csp->values[GREEN] = t * 255;
csp->values[BLUE] = p * 255;
break;
case 1:
csp->values[RED] = q * 255;
csp->values[GREEN] = v * 255;
csp->values[BLUE] = p * 255;
break;
case 2:
csp->values[RED] = p * 255;
csp->values[GREEN] = v * 255;
csp->values[BLUE] = t * 255;
break;
case 3:
csp->values[RED] = p * 255;
csp->values[GREEN] = q * 255;
csp->values[BLUE] = v * 255;
break;
case 4:
csp->values[RED] = t * 255;
csp->values[GREEN] = p * 255;
csp->values[BLUE] = v * 255;
break;
case 5:
csp->values[RED] = v * 255;
csp->values[GREEN] = p * 255;
csp->values[BLUE] = q * 255;
break;
}
}
}
}
static void
color_select_update_hsv_values (ColorSelectP csp)
{
int r, g, b;
float h, s, v;
int min, max;
int delta;
if (csp)
{
r = csp->values[RED];
g = csp->values[GREEN];
b = csp->values[BLUE];
if (r > g)
{
if (r > b)
max = r;
else
max = b;
if (g < b)
min = g;
else
min = b;
}
else
{
if (g > b)
max = g;
else
max = b;
if (r < b)
min = r;
else
min = b;
}
v = max;
if (max != 0)
s = (max - min) / (float) max;
else
s = 0;
if (s == 0)
h = 0;
else
{
h = 0;
delta = max - min;
if (r == max)
h = (g - b) / (float) delta;
else if (g == max)
h = 2 + (b - r) / (float) delta;
else if (b == max)
h = 4 + (r - g) / (float) delta;
h *= 60;
if (h < 0)
h += 360;
}
csp->values[HUE] = h;
csp->values[SATURATION] = s * 100;
csp->values[VALUE] = v * 100 / 255;
}
}
static void update_color_preview (ColorSelectP coldata,
GtkWidget *preview, gint hue_changed) {
guchar buf[3*PREVIEWSIZE];
gint x, y, k, r2, dx, col;
gint x0, y0;
gfloat hue, sat, val, s, v;
gint hx,hy, sx,sy, vx,vy;
hue = (float) coldata->values[HUE] * M_PI / 180;
hx = sin(hue) * COLORTRIANGLERADIUS;
hy = cos(hue) * COLORTRIANGLERADIUS;
sx = sin(hue - 2*M_PI/3) * COLORTRIANGLERADIUS;
sy = cos(hue - 2*M_PI/3) * COLORTRIANGLERADIUS;
vx = sin(hue + 2*M_PI/3) * COLORTRIANGLERADIUS;
vy = cos(hue + 2*M_PI/3) * COLORTRIANGLERADIUS;
hue = (float) coldata->values[HUE];
if (hue_changed) {
for (y = COLORWHEELRADIUS; y > -COLORWHEELRADIUS; y--) {
dx = (int) sqrt((float) abs((COLORWHEELRADIUS)*(COLORWHEELRADIUS)-y*y));
for (x = -dx, k=0; x <= dx; x++) {
buf[k]=buf[k+1]=buf[k+2]=BGCOLOR;
r2 = (x*x)+(y*y);
if ( r2 <= COLORWHEELRADIUS * COLORWHEELRADIUS) {
if (r2 > COLORTRIANGLERADIUS * COLORTRIANGLERADIUS) {
color_hsv_to_rgb (atan2 (x,y) / M_PI * 180, 1, 1, &buf[k], &buf[k+1], &buf[k+2]);
} else {
val = (float) ((x-sx)*(hy-vy)-(y-sy)*(hx-vx)) / (float) ((vx-sx)*(hy-vy)-(vy-sy)*(hx-vx));
if (val>0 && val<=1) { /* eigentlich val>=0, aber dann Grafikfehler... */
sat = (val==0?0: ((float) (y-sy-val*(vy-sy)) / (val * (float) (hy-vy))));
if (sat >= 0 && sat <= 1)
color_hsv_to_rgb (hue, sat, val, &buf[k], &buf[k+1], &buf[k+2]);
}
}
}
k += 3;
}
/* gtk_preview_draw_row (GTK_PREVIEW (preview), buf, 0, COLORWHEELRADIUS - y - 1, PREVIEWSIZE); */
gtk_preview_draw_row (GTK_PREVIEW (preview), buf, COLORWHEELRADIUS - dx, COLORWHEELRADIUS - y - 1, 2*dx+1);
}
/* Marker im aeusseren Ring */
x0 = (gint) (sin(hue*M_PI/180) * ((float) (COLORWHEELRADIUS - COLORTRIANGLERADIUS + 1)/2 + COLORTRIANGLERADIUS) + 0.5);
y0 = (gint) (cos(hue*M_PI/180) * ((float) (COLORWHEELRADIUS - COLORTRIANGLERADIUS + 1)/2 + COLORTRIANGLERADIUS) + 0.5);
color_hsv_to_rgb (atan2 (x0,y0) / M_PI * 180, 1, 1, &buf[0], &buf[1], &buf[2]);
col = INTENSITY(buf[0], buf[1], buf[2]) > 127 ? 0 : 255 ;
for (y = y0 - 4 ; y <= y0 + 4 ; y++) {
for (x = x0 - 4, k=0 ; x <= x0 + 4 ; x++) {
r2 = (x-x0)*(x-x0)+(y-y0)*(y-y0);
if (r2 <= 20 && r2 >= 6)
buf[k]=buf[k+1]=buf[k+2]=col;
else
color_hsv_to_rgb (atan2 (x,y) / M_PI * 180, 1, 1, &buf[k], &buf[k+1], &buf[k+2]);
k += 3;
}
gtk_preview_draw_row (GTK_PREVIEW (preview), buf, COLORWHEELRADIUS + x0-4, COLORWHEELRADIUS - 1 - y, 9);
}
} else {
/* Marker im Dreieck loeschen */
s = coldata->oldsat;
v = coldata->oldval;
x0 = (gint) (sx + (vx - sx)*v + (hx - vx) * s * v);
y0 = (gint) (sy + (vy - sy)*v + (hy - vy) * s * v);
for (y = y0 - 4 ; y <= y0 + 4 ; y++) {
for (x = x0 - 4, k=0 ; x <= x0 + 4 ; x++) {
buf[k]=buf[k+1]=buf[k+2]=BGCOLOR;
r2 = (x-x0)*(x-x0)+(y-y0)*(y-y0);
if (x*x+y*y > COLORTRIANGLERADIUS * COLORTRIANGLERADIUS) {
color_hsv_to_rgb (atan2 (x,y) / M_PI * 180, 1, 1, &buf[k], &buf[k+1], &buf[k+2]);
} else {
val = (float) ((x-sx)*(hy-vy)-(y-sy)*(hx-vx)) / (float) ((vx-sx)*(hy-vy)-(vy-sy)*(hx-vx));
if (val>0 && val<=1) { /* eigentlich val>=0, aber dann Grafikfehler... */
sat = (val==0?0: ((float) (y-sy-val*(vy-sy)) / (val * (float) (hy-vy))));
if (sat >= 0 && sat <= 1)
color_hsv_to_rgb (hue, sat, val, &buf[k], &buf[k+1], &buf[k+2]);
}
}
k += 3;
}
gtk_preview_draw_row (GTK_PREVIEW (preview), buf, COLORWHEELRADIUS + x0-4, COLORWHEELRADIUS - 1 - y, 9);
}
coldata->oldsat = coldata->values[SATURATION] / 100.0;
coldata->oldval = coldata->values[VALUE] / 100.0;
}
/* Marker im Dreieck */
col = INTENSITY(coldata->values[RED], coldata->values[GREEN],
coldata->values[BLUE]) > 127 ? 0 : 255 ;
s = coldata->values[SATURATION] / 100.0;
v = coldata->values[VALUE] / 100.0;
coldata->oldsat=s;
coldata->oldval=v;
x0 = (gint) (sx + (vx - sx)*v + (hx - vx) * s * v);
y0 = (gint) (sy + (vy - sy)*v + (hy - vy) * s * v);
for (y = y0 - 4 ; y <= y0 + 4 ; y++) {
for (x = x0 - 4, k=0 ; x <= x0 + 4 ; x++) {
buf[k]=buf[k+1]=buf[k+2]=BGCOLOR;
r2 = (x-x0)*(x-x0)+(y-y0)*(y-y0);
if (r2 <= 20 && r2 >= 6)
buf[k]=buf[k+1]=buf[k+2]=col;
else {
if (x*x+y*y > COLORTRIANGLERADIUS * COLORTRIANGLERADIUS) {
color_hsv_to_rgb (atan2 (x,y) / M_PI * 180, 1, 1, &buf[k], &buf[k+1], &buf[k+2]);
} else {
val = (float) ((x-sx)*(hy-vy)-(y-sy)*(hx-vx)) / (float) ((vx-sx)*(hy-vy)-(vy-sy)*(hx-vx));
if (val>0 && val<=1) { /* eigentlich val>=0, aber dann Grafikfehler... */
sat = (val==0?0: ((float) (y-sy-val*(vy-sy)) / (val * (float) (hy-vy))));
if (sat >= 0 && sat <= 1)
color_hsv_to_rgb (hue, sat, val, &buf[k], &buf[k+1], &buf[k+2]);
}
}
}
k += 3;
}
gtk_preview_draw_row (GTK_PREVIEW (preview), buf, COLORWHEELRADIUS + x0-4, COLORWHEELRADIUS - 1 - y, 9);
}
for (k=0; k < (PREVIEWSIZE * 3); k+=3) {
buf[k]=coldata->values[RED];
buf[k+1]=coldata->values[GREEN];
buf[k+2]=coldata->values[BLUE];
}
for (y=0; y < 30; y++) {
gtk_preview_draw_row (GTK_PREVIEW (preview), buf, 0, y+PREVIEWSIZE, PREVIEWSIZE);
}
gtk_widget_draw (preview, NULL);
}
static void
init_color_preview (GtkWidget *preview)
{
guchar buf[3*PREVIEWSIZE];
gint i;
for (i=0; i < 3*PREVIEWSIZE; i+=3)
buf[i]=buf[i+1]=buf[i+2]=BGCOLOR;
for (i=0; i < PREVIEWSIZE; i++)
gtk_preview_draw_row (GTK_PREVIEW (preview), buf, 0, i, PREVIEWSIZE);
gtk_widget_draw (preview, NULL);
}
/*
* Color Preview
*/
static gint
color_selection_callback(GtkWidget *widget, GdkEvent *event)
{
ColorSelectP coldata;
gint x,y, mousex, mousey;
gfloat r;
gfloat hue, sat, val;
gint hx,hy, sx,sy, vx,vy;
coldata = gtk_object_get_user_data (GTK_OBJECT (widget));
switch (event->type) {
case GDK_BUTTON_PRESS:
x = event->button.x - COLORWHEELRADIUS - 1;
y = - event->button.y + COLORWHEELRADIUS + 1;
r = sqrt((float) (x*x+y*y));
if ( /* r <= COLORWHEELRADIUS && */ r > COLORTRIANGLERADIUS)
coldata->mode = 1; /* Dragging in the Ring */
else
coldata->mode = 2; /* Dragging in the Triangle */
break;
case GDK_MOTION_NOTIFY:
x = event->motion.x - COLORWHEELRADIUS - 1;
y = - event->motion.y + COLORWHEELRADIUS + 1;
break;
case GDK_BUTTON_RELEASE:
coldata->mode = 0;
break;
default:
gtk_widget_get_pointer(widget, &x, &y);
x = x - COLORWHEELRADIUS - 1;
y = - y + COLORWHEELRADIUS + 1;
break;
}
gtk_widget_get_pointer(widget, &mousex, &mousey);
if ((event->type == GDK_MOTION_NOTIFY &&
(mousex != event->motion.x || mousey != event->motion.y)))
return FALSE;
if (coldata->mode == 1) {
coldata->values[HUE] = ( (int) (atan2 (x, y) / M_PI * 180) + 360 ) %360;
color_select_update_rgb_values(coldata);
update_color_preview(coldata, widget, 1);
}
if (coldata->mode == 2) {
hue = (float) coldata->values[HUE] * M_PI / 180;
hx = sin(hue) * COLORTRIANGLERADIUS;
hy = cos(hue) * COLORTRIANGLERADIUS;
sx = sin(hue - 2*M_PI/3) * COLORTRIANGLERADIUS;
sy = cos(hue - 2*M_PI/3) * COLORTRIANGLERADIUS;
vx = sin(hue + 2*M_PI/3) * COLORTRIANGLERADIUS;
vy = cos(hue + 2*M_PI/3) * COLORTRIANGLERADIUS;
hue = (float) coldata->values[HUE];
if ((x-sx)*vx+(y-sy)*vy < 0) {
sat = 1;
val = ((float) ((x-sx)*(hx-sx)+(y-sy)*(hy-sy)))/((hx-sx)*(hx-sx)+(hy-sy)*(hy-sy));
if (val<0) val=0; else if (val>1) val=1;
} else if ((x-sx)*hx+(y-sy)*hy < 0) {
sat = 0;
val = ((float) ((x-sx)*(vx-sx)+(y-sy)*(vy-sy)))/((vx-sx)*(vx-sx)+(vy-sy)*(vy-sy));
if (val<0) val=0; else if (val>1) val=1;
} else if ((x-hx)*sx+(y-hy)*sy < 0) {
val = 1;
sat = ((float) ((x-vx)*(hx-vx)+(y-vy)*(hy-vy)))/((hx-vx)*(hx-vx)+(hy-vy)*(hy-vy));
if (sat<0) sat=0; else if (sat>1) sat=1;
} else {
val = (float) ((x-sx)*(hy-vy)-(y-sy)*(hx-vx)) / (float) ((vx-sx)*(hy-vy)-(vy-sy)*(hx-vx));
if (val<=0) {
val=0;
sat=0;
} else {
if (val>1) val=1;
sat = (float) (y-sy-val*(vy-sy)) / (val * (float) (hy-vy));
if (sat<0) sat=0; else if (sat>1) sat=1;
}
}
coldata->values[SATURATION]=100*sat+0.5;
coldata->values[VALUE]=100*val+0.5;
color_select_update_rgb_values(coldata);
update_color_preview(coldata, widget, 0);
}
/* callback the user */
(*coldata->callback) (coldata->data,
coldata->values[RED],
coldata->values[GREEN],
coldata->values[BLUE]);
return FALSE;
}
static GtkWidget *
create_color_preview (ColorSelectP coldata)
{
GtkWidget *preview;
preview = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_set_dither (GTK_PREVIEW (preview), GDK_RGB_DITHER_MAX);
gtk_widget_set_events( GTK_WIDGET(preview), PREVIEW_MASK );
gtk_preview_size (GTK_PREVIEW (preview), PREVIEWSIZE, PREVIEWSIZE + 30 /* BAD! */);
gtk_object_set_user_data (GTK_OBJECT (preview), coldata);
gtk_signal_connect (GTK_OBJECT(preview), "motion_notify_event",
GTK_SIGNAL_FUNC(color_selection_callback), NULL);
gtk_signal_connect (GTK_OBJECT(preview), "button_press_event",
GTK_SIGNAL_FUNC(color_selection_callback), NULL);
gtk_signal_connect (GTK_OBJECT(preview), "button_release_event",
GTK_SIGNAL_FUNC(color_selection_callback), NULL);
init_color_preview (preview);
update_color_preview (coldata, preview, 1);
return preview;
}
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