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Added conversions to and from HSB

This commit is contained in:
Caspian Rychlik-Prince 2004-04-26 10:15:56 +00:00
parent 00f82d6353
commit fc7c0fa846
1 changed files with 99 additions and 0 deletions
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99
src/java/org/lwjgl/util/Color.java
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@ -392,4 +392,103 @@ public final class Color implements ReadableColor, Serializable, WritableColor {
blue = src.getBlueByte();
alpha = src.getAlphaByte();
}
/**
* HSB to RGB conversion, pinched from java.awt.Color.
* @param hue (0..360)
* @param saturation (0..100)
* @param brightness (0..100)
*/
public void fromHSB(float hue, float saturation, float brightness) {
if (saturation == 0.0F) {
red = green = blue = (byte) (brightness * 255F + 0.5F);
} else {
float f3 = (hue - (float) Math.floor(hue)) * 6F;
float f4 = f3 - (float) Math.floor(f3);
float f5 = brightness * (1.0F - saturation);
float f6 = brightness * (1.0F - saturation * f4);
float f7 = brightness * (1.0F - saturation * (1.0F - f4));
switch ((int) f3) {
case 0 :
red = (byte) (brightness * 255F + 0.5F);
green = (byte) (f7 * 255F + 0.5F);
blue = (byte) (f5 * 255F + 0.5F);
break;
case 1 :
red = (byte) (f6 * 255F + 0.5F);
green = (byte) (brightness * 255F + 0.5F);
blue = (byte) (f5 * 255F + 0.5F);
break;
case 2 :
red = (byte) (f5 * 255F + 0.5F);
green = (byte) (brightness * 255F + 0.5F);
blue = (byte) (f7 * 255F + 0.5F);
break;
case 3 :
red = (byte) (f5 * 255F + 0.5F);
green = (byte) (f6 * 255F + 0.5F);
blue = (byte) (brightness * 255F + 0.5F);
break;
case 4 :
red = (byte) (f7 * 255F + 0.5F);
green = (byte) (f5 * 255F + 0.5F);
blue = (byte) (brightness * 255F + 0.5F);
break;
case 5 :
red = (byte) (brightness * 255F + 0.5F);
green = (byte) (f5 * 255F + 0.5F);
blue = (byte) (f6 * 255F + 0.5F);
break;
}
}
}
/**
* RGB to HSB conversion, pinched from java.awt.Color.
* The HSB value is returned in dest[] if dest[] is supplied.
* Hue is 0..360, saturation and brightness are 0..100.
* @param dest[] Destination floats, or null
* @return dest[], or a new float[]
*/
public float[] toHSB(float dest[]) {
int r = getRed();
int g = getGreen();
int b = getBlue();
if (dest == null)
dest = new float[3];
int l = r <= g ? g : r;
if (b > l)
l = b;
int i1 = r >= g ? g : r;
if (b < i1)
i1 = b;
float brightness = (float) l / 255F;
float saturation;
if (l != 0)
saturation = (float) (l - i1) / (float) l;
else
saturation = 0.0F;
float hue;
if (saturation == 0.0F) {
hue = 0.0F;
} else {
float f3 = (float) (l - r) / (float) (l - i1);
float f4 = (float) (l - g) / (float) (l - i1);
float f5 = (float) (l - b) / (float) (l - i1);
if (r == l)
hue = f5 - f4;
else if (g == l)
hue = (2.0F + f3) - f5;
else
hue = (4F + f4) - f3;
hue /= 6F;
if (hue < 0.0F)
hue++;
}
dest[0] = hue;
dest[1] = saturation;
dest[2] = brightness;
return dest;
}
}