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//
// ColorPicker.cs
//
// Author:
// Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
//
// Copyright (c) 2016 jp
//
// 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 3 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, see <http://www.gnu.org/licenses/>.
using System;
using System.Xml.Serialization;
using System.ComponentModel;
namespace Crow
{
public class ColorPicker : TemplatedControl
{
public ColorPicker () : base ()
{
}
const double div = 255.0;
const double colDiv = 1.0 / div;
Color curColor;
double h,s,v;
[XmlAttributeAttribute()]
public virtual double R {
get { return Math.Round(curColor.R * div); }
set {
if (R == value)
return;
curColor.R = value * colDiv;
NotifyValueChanged ("R", R);
hsvFromRGB ();
notifyCurColorHasChanged ();
}
}
[XmlAttributeAttribute()]
public virtual double G {
get { return Math.Round(curColor.G * div); }
set {
if (G == value)
return;
curColor.G = value * colDiv;
NotifyValueChanged ("G", G);
notifyCurColorHasChanged ();
hsvFromRGB ();
}
}
[XmlAttributeAttribute()]
public virtual double B {
get { return Math.Round(curColor.B * div); }
set {
if (B == value)
return;
curColor.B = value * colDiv;
NotifyValueChanged ("B", B);
notifyCurColorHasChanged ();
hsvFromRGB ();
}
}
[XmlAttributeAttribute()]
public virtual double A {
get { return Math.Round(curColor.A * div); }
set {
if (A == value)
return;
curColor.A = value * colDiv;
NotifyValueChanged ("A", A);
notifyCurColorHasChanged ();
hsvFromRGB ();
}
}
[XmlAttributeAttribute()]
public virtual double H {
get { return Math.Round (h, 3); }
set {
if (H == value)
return;
h = value;
NotifyValueChanged ("H", H);
rgbFromHSV ();
}
}
[XmlAttributeAttribute()]
public virtual double S {
get { return Math.Round (s, 2); }
set {
if (s == value)
return;
s = value;
NotifyValueChanged ("S", S);
rgbFromHSV ();
}
}
[XmlAttributeAttribute()]
public virtual double V {
get { return Math.Round (v, 2); }
set {
if (v == value)
return;
v = value;
NotifyValueChanged ("V", V);
rgbFromHSV ();
}
}
[XmlAttributeAttribute]
public virtual Fill SelectedColor {
get { return new SolidColor(curColor); }
set {
Color c = (value as SolidColor).color;
if (curColor == c)
return;
curColor = c;
notifyCurColorHasChanged ();
notifyRGBAHasChanged ();
hsvFromRGB ();
}
}
[XmlAttributeAttribute]
public virtual Color SelectedRawColor {
get { return curColor; }
set {
if (curColor == value)
return;
curColor = value;
notifyCurColorHasChanged ();
notifyRGBAHasChanged ();
hsvFromRGB ();
}
}
void notifyCurColorHasChanged(){
NotifyValueChanged ("SelectedColor", SelectedColor);
NotifyValueChanged ("SelectedRawColor", curColor);
string n = curColor.ToString ();
if (char.IsLetter(n[0]))
NotifyValueChanged ("SelectedColorName", n);
else
NotifyValueChanged ("SelectedColorName", "-");
NotifyValueChanged ("HexColor", ((int)R).ToString ("X2") + ((int)G).ToString ("X2") + ((int)B).ToString ("X2") + ((int)A).ToString ("X2"));
}
void notifyRGBAHasChanged(){
NotifyValueChanged ("R", R);
NotifyValueChanged ("G", G);
NotifyValueChanged ("B", B);
NotifyValueChanged ("A", A);
}
void notifyHSVHasChanged(){
NotifyValueChanged ("H", H);
NotifyValueChanged ("S", S);
NotifyValueChanged ("V", V);
}
void hsvFromRGB(){
Color c = curColor;
c.ResetName ();
double min = Math.Min (c.R, Math.Min (c.G, c.B)); //Min. value of RGB
double max = Math.Max (c.R, Math.Max (c.G, c.B)); //Max. value of RGB
double diff = max - min; //Delta RGB value
v = max;
if ( diff == 0 )//This is a gray, no chroma...
{
h = 0;
s = 0;
}else{//Chromatic data...
s = diff / max;
double diffR = (((max - c.R) / 6.0) + (diff / 2.0)) / diff;
double diffG = (((max - c.G) / 6.0) + (diff / 2.0)) / diff;
double diffB = (((max - c.B) / 6.0) + (diff / 2.0)) / diff;
if (c.R == max)
h = diffB - diffG;
else if (c.G == max)
h = (1.0 / 3.0) + diffR - diffB;
else if (c.B == max)
h = (2.0 / 3.0) + diffG - diffR;
if (h < 0)
h += 1;
if (h > 1)
h -= 1;
}
notifyHSVHasChanged ();
}
void rgbFromHSV(){
Color c = Color.Black;
c.ResetName ();
if (s == 0) {//HSV from 0 to 1
c.R = v;
c.G = v;
c.B = v;
}else{
double var_h = h * 6.0;
if (var_h == 6.0)
var_h = 0; //H must be < 1
double var_i = Math.Floor( var_h ); //Or ... var_i = floor( var_h )
double var_1 = v * ( 1.0 - s );
double var_2 = v * (1.0 - s * (var_h - var_i));
double var_3 = v * (1.0 - s * (1.0 - (var_h - var_i)));
if (var_i == 0.0) {
c.R = v;
c.G = var_3;
c.B = var_1;
}else if ( var_i == 1.0 ) { c.R = var_2 ; c.G = v ; c.B = var_1; }
else if ( var_i == 2 ) { c.R = var_1 ; c.G = v ; c.B = var_3; }
else if ( var_i == 3 ) { c.R = var_1 ; c.G = var_2 ; c.B = v; }
else if ( var_i == 4 ) { c.R = var_3 ; c.G = var_1 ; c.B = v; }
else { c.R = v ; c.G = var_1 ; c.B = var_2; }
}
curColor = c;
notifyCurColorHasChanged ();
notifyRGBAHasChanged ();
}
}
}
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