//
// "$Id: Fl_Color_Chooser.cxx 10234 2014-08-21 12:18:32Z cand $"
//
// Color chooser for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
#include <FL/Fl.H>
#include <FL/Fl_Color_Chooser.H>
#include <FL/fl_draw.H>
#include <FL/math.h>
#include <stdio.h>
// Besides being a useful object on it's own, the Fl_Color_Chooser was
// an attempt to make a complex composite object that could be easily
// imbedded into a user interface. If you wish to make complex objects
// of your own, be sure to read this code.
// The function fl_color_chooser() creates a window containing a color
// chooser and a few buttons and current-color indicators. It is an
// easier interface for simple programs that just need a color.
// The "hue box" can be a circle or rectilinear.
// You get a circle by defining this:
#define CIRCLE 1
// And the "hue box" can auto-update when the value changes
// you get this by defining this:
#define UPDATE_HUE_BOX 1
/**
This \e static method converts HSV colors to RGB colorspace.
\param[in] H, S, V color components
\param[out] R, G, B color components
*/
void Fl_Color_Chooser::hsv2rgb(
double H, double S, double V, double& R, double& G, double& B) {
if (S < 5.0e-6) {
R = G = B = V;
} else {
int i = (int)H;
double f = H - (float)i;
double p1 = V*(1.0-S);
double p2 = V*(1.0-S*f);
double p3 = V*(1.0-S*(1.0-f));
switch (i) {
case 0: R = V; G = p3; B = p1; break;
case 1: R = p2; G = V; B = p1; break;
case 2: R = p1; G = V; B = p3; break;
case 3: R = p1; G = p2; B = V; break;
case 4: R = p3; G = p1; B = V; break;
case 5: R = V; G = p1; B = p2; break;
}
}
}
/**
This \e static method converts RGB colors to HSV colorspace.
\param[in] R, G, B color components
\param[out] H, S, V color components
*/
void Fl_Color_Chooser::rgb2hsv(
double R, double G, double B, double& H, double& S, double& V) {
double maxv = R > G ? R : G; if (B > maxv) maxv = B;
V = maxv;
if (maxv>0) {
double minv = R < G ? R : G; if (B < minv) minv = B;
S = 1.0 - double(minv)/maxv;
if (maxv > minv) {
if (maxv == R) {H = (G-B)/double(maxv-minv); if (H<0) H += 6.0;}
else if (maxv == G) H = 2.0+(B-R)/double(maxv-minv);
else H = 4.0+(R-G)/double(maxv-minv);
}
}
}
/** Fl_Color_Chooser modes */
enum {
M_RGB, /**< mode() of Fl_Color_Chooser showing RGB values */
M_BYTE, /**< mode() of Fl_Color_Chooser showing byte values */
M_HEX, /**< mode() of Fl_Color_Chooser showing hex values */
M_HSV /**< mode() of Fl_Color_Chooser showing HSV values */
};
static const Fl_Menu_Item mode_menu[] = {
{"rgb"},
{"byte"},
{"hex"},
{"hsv"},
{0}
};
#ifndef FL_DOXYGEN
int Flcc_Value_Input::format(char* buf) {
Fl_Color_Chooser* c = (Fl_Color_Chooser*)parent();
if (c->mode() == M_HEX) return sprintf(buf,"0x%02X", int(value()));
else return Fl_Valuator::format(buf);
}
#endif // !FL_DOXYGEN
void Fl_Color_Chooser::set_valuators() {
switch (mode()) {
case M_RGB:
rvalue.range(0,1); rvalue.step(1,1000); rvalue.value(r_);
gvalue.range(0,1); gvalue.step(1,1000); gvalue.value(g_);
bvalue.range(0,1); bvalue.step(1,1000); bvalue.value(b_);
break;
case M_BYTE: /* FALLTHROUGH */
case M_HEX:
rvalue.range(0,255); rvalue.step(1); rvalue.value(int(255*r_+.5));
gvalue.range(0,255); gvalue.step(1); gvalue.value(int(255*g_+.5));
bvalue.range(0,255); bvalue.step(1); bvalue.value(int(255*b_+.5));
break;
case M_HSV:
rvalue.range(0,6); rvalue.step(1,1000); rvalue.value(hue_);
gvalue.range(0,1); gvalue.step(1,1000); gvalue.value(saturation_);
bvalue.range(0,1); bvalue.step(1,1000); bvalue.value(value_);
break;
}
}
/**
Sets the current rgb color values.
Does not do the callback. Does not clamp (but out of range values will
produce psychedelic effects in the hue selector).
\param[in] R, G, B color components.
\return 1 if a new rgb value was set, 0 if the rgb value was the previous one.
*/
int Fl_Color_Chooser::rgb(double R, double G, double B) {
if (R == r_ && G == g_ && B == b_) return 0;
r_ = R; g_ = G; b_ = B;
double ph = hue_;
double ps = saturation_;
double pv = value_;
rgb2hsv(R,G,B,hue_,saturation_,value_);
set_valuators();
set_changed();
if (value_ != pv) {
#ifdef UPDATE_HUE_BOX
huebox.damage(FL_DAMAGE_SCROLL);
#endif
valuebox.damage(FL_DAMAGE_EXPOSE);}
if (hue_ != ph || saturation_ != ps) {
huebox.damage(FL_DAMAGE_EXPOSE);
valuebox.damage(FL_DAMAGE_SCROLL);
}
return 1;
}
/**
Set the hsv values.
The passed values are clamped (or for hue, modulus 6 is used) to get
legal values. Does not do the callback.
\param[in] H, S, V color components.
\return 1 if a new hsv value was set, 0 if the hsv value was the previous one.
*/
int Fl_Color_Chooser::hsv(double H, double S, double V) {
H = fmod(H,6.0); if (H < 0.0) H += 6.0;
if (S < 0.0) S = 0.0; else if (S > 1.0) S = 1.0;
if (V < 0.0) V = 0.0; else if (V > 1.0) V = 1.0;
if (H == hue_ && S == saturation_ && V == value_) return 0;
double ph = hue_;
double ps = saturation_;
double pv = value_;
hue_ = H; saturation_ = S; value_ = V;
if (value_ != pv) {
#ifdef UPDATE_HUE_BOX
huebox.damage(FL_DAMAGE_SCROLL);
#endif
valuebox.damage(FL_DAMAGE_EXPOSE);}
if (hue_ != ph || saturation_ != ps) {
huebox.damage(FL_DAMAGE_EXPOSE);
valuebox.damage(FL_DAMAGE_SCROLL);
}
hsv2rgb(H,S,V,r_,g_,b_);
set_valuators();
set_changed();
return 1;
}
////////////////////////////////////////////////////////////////
static void tohs(double x, double y, double& h, double& s) {
#ifdef CIRCLE
x = 2*x-1;
y = 1-2*y;
s = sqrt(x*x+y*y); if (s > 1.0) s = 1.0;
h = (3.0/M_PI)*atan2(y,x);
if (h<0) h += 6.0;
#else
h = fmod(6.0*x,6.0); if (h < 0.0) h += 6.0;
s = 1.0-y; if (s < 0.0) s = 0.0; else if (s > 1.0) s = 1.0;
#endif
}
#ifndef FL_DOXYGEN
int Flcc_HueBox::handle(int e) {
static double ih, is;
Fl_Color_Chooser* c = (Fl_Color_Chooser*)parent();
switch (e) {
case FL_PUSH:
if (Fl::visible_focus()) {
Fl::focus(this);
redraw();
}
ih = c->hue();
is = c->saturation();
case FL_DRAG: {
double Xf, Yf, H, S;
Xf = (Fl::event_x()-x()-Fl::box_dx(box()))/double(w()-Fl::box_dw(box()));
Yf = (Fl::event_y()-y()-Fl::box_dy(box()))/double(h()-Fl::box_dh(box()));
tohs(Xf, Yf, H, S);
if (fabs(H-ih) < 3*6.0/w()) H = ih;
if (fabs(S-is) < 3*1.0/h()) S = is;
if (Fl::event_state(FL_CTRL)) H = ih;
if (c->hsv(H, S, c->value())) c->do_callback();
} return 1;
case FL_FOCUS : /* FALLTHROUGH */
case FL_UNFOCUS :
if (Fl::visible_focus()) {
redraw();
return 1;
}
else return 1;
case FL_KEYBOARD :
return handle_key(Fl::event_key());
default:
return 0;
}
}
#endif // !FL_DOXYGEN
static void generate_image(void* vv, int X, int Y, int W, uchar* buf) {
Flcc_HueBox* v = (Flcc_HueBox*)vv;
int iw = v->w()-Fl::box_dw(v->box());
double Yf = double(Y)/(v->h()-Fl::box_dh(v->box()));
#ifdef UPDATE_HUE_BOX
const double V = ((Fl_Color_Chooser*)(v->parent()))->value();
#else
const double V = 1.0;
#endif
for (int x = X; x < X+W; x++) {
double Xf = double(x)/iw;
double H,S; tohs(Xf,Yf,H,S);
double r=0, g=0, b=0;
Fl_Color_Chooser::hsv2rgb(H,S,V,r,g,b);
*buf++ = uchar(255*r+.5);
*buf++ = uchar(255*g+.5);
*buf++ = uchar(255*b+.5);
}
}
#ifndef FL_DOXYGEN
int Flcc_HueBox::handle_key(int key) {
int w1 = w()-Fl::box_dw(box())-6;
int h1 = h()-Fl::box_dh(box())-6;
Fl_Color_Chooser* c = (Fl_Color_Chooser*)parent();
#ifdef CIRCLE
int X = int(.5*(cos(c->hue()*(M_PI/3.0))*c->saturation()+1) * w1);
int Y = int(.5*(1-sin(c->hue()*(M_PI/3.0))*c->saturation()) * h1);
#else
int X = int(c->hue()/6.0*w1);
int Y = int((1-c->saturation())*h1);
#endif
switch (key) {
case FL_Up :
Y -= 3;
break;
case FL_Down :
Y += 3;
break;
case FL_Left :
X -= 3;
break;
case FL_Right :
X += 3;
break;
default :
return 0;
}
double Xf, Yf, H, S;
Xf = (double)X/(double)w1;
Yf = (double)Y/(double)h1;
tohs(Xf, Yf, H, S);
if (c->hsv(H, S, c->value())) c->do_callback();
return 1;
}
#endif // !FL_DOXYGEN
#ifndef FL_DOXYGEN
void Flcc_HueBox::draw() {
if (damage()&FL_DAMAGE_ALL) draw_box();
int x1 = x()+Fl::box_dx(box());
int yy1 = y()+Fl::box_dy(box());
int w1 = w()-Fl::box_dw(box());
int h1 = h()-Fl::box_dh(box());
if (damage() == FL_DAMAGE_EXPOSE) fl_push_clip(x1+px,yy1+py,6,6);
fl_draw_image(generate_image, this, x1, yy1, w1, h1);
if (damage() == FL_DAMAGE_EXPOSE) fl_pop_clip();
Fl_Color_Chooser* c = (Fl_Color_Chooser*)parent();
#ifdef CIRCLE
int X = int(.5*(cos(c->hue()*(M_PI/3.0))*c->saturation()+1) * (w1-6));
int Y = int(.5*(1-sin(c->hue()*(M_PI/3.0))*c->saturation()) * (h1-6));
#else
int X = int(c->hue()/6.0*(w1-6));
int Y = int((1-c->saturation())*(h1-6));
#endif
if (X < 0) X = 0; else if (X > w1-6) X = w1-6;
if (Y < 0) Y = 0; else if (Y > h1-6) Y = h1-6;
// fl_color(c->value()>.75 ? FL_BLACK : FL_WHITE);
draw_box(FL_UP_BOX,x1+X,yy1+Y,6,6,Fl::focus() == this ? FL_FOREGROUND_COLOR : FL_GRAY);
px = X; py = Y;
}
#endif // !FL_DOXYGEN
////////////////////////////////////////////////////////////////
#ifndef FL_DOXYGEN
int Flcc_ValueBox::handle(int e) {
static double iv;
Fl_Color_Chooser* c = (Fl_Color_Chooser*)parent();
switch (e) {
case FL_PUSH:
if (Fl::visible_focus()) {
Fl::focus(this);
redraw();
}
iv = c->value();
case FL_DRAG: {
double Yf;
Yf = 1-(Fl::event_y()-y()-Fl::box_dy(box()))/double(h()-Fl::box_dh(box()));
if (fabs(Yf-iv)<(3*1.0/h())) Yf = iv;
if (c->hsv(c->hue(),c->saturation(),Yf)) c->do_callback();
} return 1;
case FL_FOCUS : /* FALLTHROUGH */
case FL_UNFOCUS :
if (Fl::visible_focus()) {
redraw();
return 1;
}
else return 1;
case FL_KEYBOARD :
return handle_key(Fl::event_key());
default:
return 0;
}
}
#endif // !FL_DOXYGEN
static double tr, tg, tb;
static void generate_vimage(void* vv, int X, int Y, int W, uchar* buf) {
Flcc_ValueBox* v = (Flcc_ValueBox*)vv;
double Yf = 255*(1.0-double(Y)/(v->h()-Fl::box_dh(v->box())));
uchar r = uchar(tr*Yf+.5);
uchar g = uchar(tg*Yf+.5);
uchar b = uchar(tb*Yf+.5);
for (int x = X; x < X+W; x++) {
*buf++ = r; *buf++ = g; *buf++ = b;
}
}
#ifndef FL_DOXYGEN
void Flcc_ValueBox::draw() {
if (damage()&FL_DAMAGE_ALL) draw_box();
Fl_Color_Chooser* c = (Fl_Color_Chooser*)parent();
c->hsv2rgb(c->hue(),c->saturation(),1.0,tr,tg,tb);
int x1 = x()+Fl::box_dx(box());
int yy1 = y()+Fl::box_dy(box());
int w1 = w()-Fl::box_dw(box());
int h1 = h()-Fl::box_dh(box());
if (damage() == FL_DAMAGE_EXPOSE) fl_push_clip(x1,yy1+py,w1,6);
fl_draw_image(generate_vimage, this, x1, yy1, w1, h1);
if (damage() == FL_DAMAGE_EXPOSE) fl_pop_clip();
int Y = int((1-c->value()) * (h1-6));
if (Y < 0) Y = 0; else if (Y > h1-6) Y = h1-6;
draw_box(FL_UP_BOX,x1,yy1+Y,w1,6,Fl::focus() == this ? FL_FOREGROUND_COLOR : FL_GRAY);
py = Y;
}
#endif // !FL_DOXYGEN
#ifndef FL_DOXYGEN
int Flcc_ValueBox::handle_key(int key) {
int h1 = h()-Fl::box_dh(box())-6;
Fl_Color_Chooser* c = (Fl_Color_Chooser*)parent();
int Y = int((1-c->value()) * h1);
if (Y < 0) Y = 0; else if (Y > h1) Y = h1;
switch (key) {
case FL_Up :
Y -= 3;
break;
case FL_Down :
Y += 3;
break;
default :
return 0;
}
double Yf;
Yf = 1-((double)Y/(double)h1);
if (c->hsv(c->hue(),c->saturation(),Yf)) c->do_callback();
return 1;
}
#endif // !FL_DOXYGEN
////////////////////////////////////////////////////////////////
void Fl_Color_Chooser::rgb_cb(Fl_Widget* o, void*) {
Fl_Color_Chooser* c = (Fl_Color_Chooser*)(o->parent());
double R = c->rvalue.value();
double G = c->gvalue.value();
double B = c->bvalue.value();
if (c->mode() == M_HSV) {
if (c->hsv(R,G,B)) c->do_callback();
return;
}
if (c->mode() != M_RGB) {
R = R/255;
G = G/255;
B = B/255;
}
if (c->rgb(R,G,B)) c->do_callback();
}
void Fl_Color_Chooser::mode_cb(Fl_Widget* o, void*) {
Fl_Color_Chooser* c = (Fl_Color_Chooser*)(o->parent());
// force them to redraw even if value is the same:
c->rvalue.value(-1);
c->gvalue.value(-1);
c->bvalue.value(-1);
c->set_valuators();
}
void Fl_Color_Chooser::mode(int newMode)
{
choice.value(newMode);
choice.do_callback();
}
////////////////////////////////////////////////////////////////
/**
Creates a new Fl_Color_Chooser widget using the given position, size, and
label string.
The recommended dimensions are 200x95. The color is initialized to black.
\param[in] X, Y, W, H position and size of the widget
\param[in] L widget label, default is no label
*/
Fl_Color_Chooser::Fl_Color_Chooser(int X, int Y, int W, int H, const char* L)
: Fl_Group(0,0,195,115,L),
huebox(0,0,115,115),
valuebox(115,0,20,115),
choice(140,0,55,25),
rvalue(140,30,55,25),
gvalue(140,60,55,25),
bvalue(140,90,55,25),
resize_box(0,0,115,115)
{
end();
resizable(resize_box);
resize(X,Y,W,H);
r_ = g_ = b_ = 0;
hue_ = 0.0;
saturation_ = 0.0;
value_ = 0.0;
huebox.box(FL_DOWN_FRAME);
valuebox.box(FL_DOWN_FRAME);
choice.menu(mode_menu);
set_valuators();
rvalue.callback(rgb_cb);
gvalue.callback(rgb_cb);
bvalue.callback(rgb_cb);
choice.callback(mode_cb);
choice.box(FL_THIN_UP_BOX);
choice.textfont(FL_HELVETICA_BOLD_ITALIC);
}
////////////////////////////////////////////////////////////////
// fl_color_chooser():
#include <FL/Fl_Window.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Return_Button.H>
class ColorChip : public Fl_Widget {
void draw();
public:
uchar r,g,b;
ColorChip(int X, int Y, int W, int H) : Fl_Widget(X,Y,W,H) {
box(FL_ENGRAVED_FRAME);}
};
void ColorChip::draw() {
if (damage()&FL_DAMAGE_ALL) draw_box();
fl_rectf(x()+Fl::box_dx(box()),
y()+Fl::box_dy(box()),
w()-Fl::box_dw(box()),
h()-Fl::box_dh(box()),r,g,b);
}
static void chooser_cb(Fl_Widget* o, void* vv) {
Fl_Color_Chooser* c = (Fl_Color_Chooser*)o;
ColorChip* v = (ColorChip*)vv;
v->r = uchar(255*c->r()+.5);
v->g = uchar(255*c->g()+.5);
v->b = uchar(255*c->b()+.5);
v->damage(FL_DAMAGE_EXPOSE);
}
extern const char* fl_ok;
extern const char* fl_cancel;
// fl_color_chooser's callback for ok_button (below)
// [in] o is a pointer to okay_button (below)
// [in] p is a pointer to an int to receive the return value (1)
// closes the fl_color_chooser window
static void cc_ok_cb (Fl_Widget *o, void *p) {
*((int *)p) = 1; // set return value
o->window()->hide();
}
// fl_color_chooser's callback for cancel_button and window close
// [in] o is a pointer to cancel_button (below) _or_ the dialog window
// [in] p is a pointer to an int to receive the return value (0)
// closes the fl_color_chooser window
static void cc_cancel_cb (Fl_Widget *o, void *p) {
*((int *)p) = 0; // set return value
if (o->window()) // cancel button
o->window()->hide();
else // window close
o->hide();
}
/** \addtogroup group_comdlg
@{ */
/**
\brief Pops up a window to let the user pick an arbitrary RGB color.
\note \#include <FL/Fl_Color_Chooser.H>
\image html fl_color_chooser.jpg
\image latex fl_color_chooser.jpg "fl_color_chooser" width=8cm
\param[in] name Title label for the window
\param[in,out] r, g, b Color components in the range 0.0 to 1.0.
\param[in] cmode Optional mode for color chooser. See mode(int). Default -1 if none (rgb mode).
\retval 1 if user confirms the selection
\retval 0 if user cancels the dialog
\relates Fl_Color_Chooser
*/
int fl_color_chooser(const char* name, double& r, double& g, double& b, int cmode) {
int ret = 0;
Fl_Window window(215,200,name);
window.callback(cc_cancel_cb,&ret);
Fl_Color_Chooser chooser(10, 10, 195, 115);
ColorChip ok_color(10, 130, 95, 25);
Fl_Return_Button ok_button(10, 165, 95, 25, fl_ok);
ok_button.callback(cc_ok_cb,&ret);
ColorChip cancel_color(110, 130, 95, 25);
cancel_color.r = uchar(255*r+.5); ok_color.r = cancel_color.r;
ok_color.g = cancel_color.g = uchar(255*g+.5);
ok_color.b = cancel_color.b = uchar(255*b+.5);
Fl_Button cancel_button(110, 165, 95, 25, fl_cancel);
cancel_button.callback(cc_cancel_cb,&ret);
window.resizable(chooser);
chooser.rgb(r,g,b);
chooser.callback(chooser_cb, &ok_color);
if (cmode!=-1) chooser.mode(cmode);
window.end();
window.set_modal();
window.hotspot(window);
window.show();
while (window.shown()) Fl::wait();
if (ret) { // ok_button or Enter
r = chooser.r();
g = chooser.g();
b = chooser.b();
}
return ret;
}
/**
\brief Pops up a window to let the user pick an arbitrary RGB color.
\note \#include <FL/Fl_Color_Chooser.H>
\image html fl_color_chooser.jpg
\image latex fl_color_chooser.jpg "fl_color_chooser" width=8cm
\param[in] name Title label for the window
\param[in,out] r, g, b Color components in the range 0 to 255.
\param[in] cmode Optional mode for color chooser. See mode(int). Default -1 if none (rgb mode).
\retval 1 if user confirms the selection
\retval 0 if user cancels the dialog
\relates Fl_Color_Chooser
*/
int fl_color_chooser(const char* name, uchar& r, uchar& g, uchar& b, int cmode) {
double dr = r/255.0;
double dg = g/255.0;
double db = b/255.0;
if (fl_color_chooser(name,dr,dg,db,cmode)) {
r = uchar(255*dr+.5);
g = uchar(255*dg+.5);
b = uchar(255*db+.5);
return 1;
}
return 0;
}
/** @} */
//
// End of "$Id: Fl_Color_Chooser.cxx 10234 2014-08-21 12:18:32Z cand $".
//