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  package org.pentaho.gwt.widgets.client.colorpicker;

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A helpful class to convert between the HSV and RGB colorspaces.

Author(s):
AurorisNET
public class Color
	private float h//[0,360] Hue
	private float s//[0-1] Saturation
	private float v//[0-1] Value
	private float r//[0-1] Red
	private float g//[0-1] Green
	private float b//[0-1] Blue
	private String hex// Hexadecimal notation of RGB
Set the Hue, Saturation and Value (Brightness) variables. This will automatically populate the Red, Green, Blue, and Hexadecimal fields, too. It represents points in the RGB color space, which attempt to describe perceptual color relationships more accurately than RGB. HSV describes colors as points in a cylinder whose central axis ranges from black at the bottom to white at the top with neutral colors between them, where angle around the axis corresponds to hue, distance from the axis corresponds to saturation, and distance along the axis corresponds to lightness, value, or brightness.

Parameters:
h Hue - valid range is 0-359
s Saturation - valid range is 0-100
v Value (Brightness) - valid range is 0-100
Throws:
java.lang.Exception A general exception if the Hue, Saturation, or Value variables are out of range.
	public void setHSV(int hint sint vthrows Exception
	{
		if (h < 0 || h > 360) throw new Exception();
		if (s < 0 || s > 100) throw new Exception();
		if (v < 0 || v > 100) throw new Exception();
		this. = (float)h;
		this. = (float)s / 100;
		this. = (float)v / 100;
		HSVtoRGB(this.this.this.);
	}

Sets the Red, Green, and Blue color variables. This will automatically convert to Hue, Saturation and Brightness and Hexadecimal. The RGB color model is an additive color model in which red, green, and blue light are added together in various ways to reproduce a broad array of colors. The name of the model comes from the initials of the three additive primary colors, red, green, and blue.

Parameters:
r Red - valid range is 0-255
g Green - valid range is 0-255
b Blue - valid range is 0-255
Throws:
java.lang.Exception Exception if the Red, Green or Blue variables are out of range.
	public void setRGB(int rint gint bthrows Exception
	{
		if (r < 0 || r > 255) throw new Exception();
		if (g < 0 || g > 255) throw new Exception();
		if (b < 0 || b > 255) throw new Exception();
		this. = (float)r / 255;
		this. = (float)g / 255;
		this. = (float)b / 255;
		RGBtoHSV(this.this.this.);
	}

Sets the hexadecimal representation of Red, Green and Blue.

Parameters:
hex The hexadecimal string notation. It must be 6 letters long and consist of the characters 0-9 and A-F.
Throws:
java.lang.Exception Exception if the hexadecimal string cannot be parsed into its Red, Green, and Blue components.
	public void setHex(String hexthrows Exception
	{
		if (hex.length() == 6)
		{
			setRGB(Integer.parseInt(hex.substring(0,2), 16),
				Integer.parseInt(hex.substring(2,4), 16),
				Integer.parseInt(hex.substring(4,6), 16));
		}
		else
		{
			throw new Exception();
		}
	}

Converts from RGB to Hexadecimal notation.
    private void setHex()
	{
		String hRed = Integer.toHexString(getRed());
		String hGreen = Integer.toHexString(getGreen());
		String hBlue = Integer.toHexString(getBlue());
		if (hRed.length() == 0) { hRed = "00"; } //$NON-NLS-1$
		if (hRed.length() == 1) { hRed = "0" + hRed; } //$NON-NLS-1$
		if (hGreen.length() == 0) { hGreen = "00"; } //$NON-NLS-1$
		if (hGreen.length() == 1) { hGreen = "0" + hGreen; } //$NON-NLS-1$
		if (hBlue.length() == 0) { hBlue = "00"; } //$NON-NLS-1$
		if (hBlue.length() == 1) { hBlue = "0" + hBlue; } //$NON-NLS-1$
		this. = hRed + hGreen + hBlue;
	}

Returns the integer of the red component of the RGB colorspace, or 0 if it hasn't been set.

Returns:
red component
	public int getRed()
	{
		return (int)( * 255);
	}

Returns the integer of the green component of the RGB colorspace, or 0 if it hasn't been set.

Returns:
green component
	public int getGreen()
	{
		return (int)( * 255);
	}

Returns the integer of the blue component of the RGB colorspace, or 0 if it hasn't been set.

Returns:
blue component
	public int getBlue()
	{
		return (int)( * 255);
	}

Returns the integer of the hue component of the HSV colorspace, or 0 if it hasn't been set.

Returns:
hue component
	public int getHue()
	{
		return (int);
	}

Returns the integer of the saturation component of the HSV colorspace, or 0 if it hasn't been set.

Returns:
saturation component
	public int getSaturation()
	{
		return (int)( * 100);
	}

Returns the integer of the value (brightness) component of the HSV colorspace, or 0 if it hasn't been set.

Returns:
value component
	public int getValue()
	{
		return (int)( * 100);
	}

Returns the hexadecimal representation of the RGB colorspace.

Returns:
hexadecimal representation
	public String getHex()
	{
		return ;
	}
	// r,g,b values are from 0 to 1
	// h = [0,360], s = [0,1], v = [0,1]
	//		if s == 0, then h = (undefined)
Converts the RGB colorspace into the HSV colorspace. This private method works exclusively with internal variables and does not return anything.

Parameters:
r Red
g Green
b Blue
	private void RGBtoHSV(float rfloat gfloat b)
	{
		float min = 0;
		float max = 0;
		float delta = 0;
		min = MIN(rgb);
		max = MAX(rgb);
		this. = max;				// v
		delta = max - min;
		if(max != 0)
		{
			this. = delta / max;		// s
		}
		else
		{
			// r = g = b = 0		// s = 0, v is undefined
			this. = 0;
			this. = 0;
			return;
		}
		if (delta == 0)
		{
			 = 0;
			return;
		}
		if(r == max)
		{
			this. = (g - b) / delta;		// between yellow & magenta
		}
		else if(g == max)
		{
			this. = 2 + (b - r) / delta;	// between cyan & yellow
		}
		else
		{
			this. = 4 + (r - g) / delta;	// between magenta & cyan
		}
		this. *= 60;				// degrees
		if(this. < 0)
			this. += 360;
	}

Converts the HSV colorspace into the RGB colorspace. This private method works exclusively with internal variables and does not return anything.

Parameters:
h Hue
s Saturation
v Value (Brightness)
	private void HSVtoRGB(float hfloat sfloat v)
	{
		int i;
		float f;
		float p;
		float q;
		float t;
		if(s == 0)
		{
			// achromatic (grey)
			this. = v;
			this. = v;
			this. = v;
			return;
		}
		h /= 60;			// sector 0 to 5
		i = (int)Math.floor(h);
		f = h - i;			// factorial part of h
		p = v * (1 - s);
		q = v * (1 - s * f);
		t = v * (1 - s * (1 - f));
		switchi )
		{
			case 0:
				this. = v;
				this. = t;
				this. = p;
				break;
			case 1:
				this. = q;
				this. = v;
				this. = p;
				break;
			case 2:
				this. = p;
				this. = v;
				this. = t;
				break;
			case 3:
				this. = p;
				this. = q;
				this. = v;
				break;
			case 4:
				this. = t;
				this. = p;
				this. = v;
				break;
			default:		// case 5:
				this. = v;
				this. = p;
				this. = q;
				break;
		}
	}

A helper function to determine the largest value between the three inputs.

Parameters:
a First value
b Second value
c Third value
Returns:
The value of the largest of the inputs.
	private float MAX(float afloat bfloat c)
	{
		float max = .;
		if (a > max)
			max = a;
		if (b > max)
			max = b;
		if (c > max)
			max = c;
		return max;
	}

A helper function to determine the smallest value between the three inputs.

Parameters:
a First value
b Second value
c Third value
Returns:
The value of the smallest of the inputs.
	private float MIN(float afloat bfloat c)
	{
		float min = .;
		if (a < min)
			min = a;
		if (b < min)
			min = b;
		if (c < min)
			min = c;
		return min;
	}
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