/*
* Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package javax.swing.colorchooser;
final class
ColorModelHSV extends
ColorModel {
ColorModelHSV() {
super("hsv", "Hue", "Saturation", "Value", "Transparency"); // NON-NLS: components
}
@
Override
void
setColor(int
color, float[]
space) {
super.setColor(
color,
space);
RGBtoHSV(
space,
space);
space[3] = 1.0f -
space[3];
}
@
Override
int
getColor(float[]
space) {
space[3] = 1.0f -
space[3];
HSVtoRGB(
space,
space);
return super.getColor(
space);
}
@
Override
int
getMaximum(int
index) {
return (
index == 0) ? 360 : 100;
}
@
Override
float
getDefault(int
index) {
return (
index == 0) ? -1.0f : 1.0f;
}
/**
* Converts HSV components of a color to a set of RGB components.
*
* @param hsv a float array with length equal to
* the number of HSV components
* @param rgb a float array with length of at least 3
* that contains RGB components of a color
* @return a float array that contains RGB components
*/
private static float[]
HSVtoRGB(float[]
hsv, float[]
rgb) {
if (
rgb == null) {
rgb = new float[3];
}
float
hue =
hsv[0];
float
saturation =
hsv[1];
float
value =
hsv[2];
rgb[0] =
value;
rgb[1] =
value;
rgb[2] =
value;
if (
saturation > 0.0f) {
hue = (
hue < 1.0f) ?
hue * 6.0f : 0.0f;
int
integer = (int)
hue;
float
f =
hue - (float)
integer;
switch (
integer) {
case 0:
rgb[1] *= 1.0f -
saturation * (1.0f -
f);
rgb[2] *= 1.0f -
saturation;
break;
case 1:
rgb[0] *= 1.0f -
saturation *
f;
rgb[2] *= 1.0f -
saturation;
break;
case 2:
rgb[0] *= 1.0f -
saturation;
rgb[2] *= 1.0f -
saturation * (1.0f -
f);
break;
case 3:
rgb[0] *= 1.0f -
saturation;
rgb[1] *= 1.0f -
saturation *
f;
break;
case 4:
rgb[0] *= 1.0f -
saturation * (1.0f -
f);
rgb[1] *= 1.0f -
saturation;
break;
case 5:
rgb[1] *= 1.0f -
saturation;
rgb[2] *= 1.0f -
saturation *
f;
break;
}
}
return
rgb;
}
/**
* Converts RGB components of a color to a set of HSV components.
*
* @param rgb a float array with length of at least 3
* that contains RGB components of a color
* @param hsv a float array with length equal to
* the number of HSV components
* @return a float array that contains HSV components
*/
private static float[]
RGBtoHSV(float[]
rgb, float[]
hsv) {
if (
hsv == null) {
hsv = new float[3];
}
float
max =
ColorModelHSL.
max(
rgb[0],
rgb[1],
rgb[2]);
float
min =
ColorModelHSL.
min(
rgb[0],
rgb[1],
rgb[2]);
float
saturation =
max -
min;
if (
saturation > 0.0f) {
saturation /=
max;
}
hsv[0] =
ColorModelHSL.
getHue(
rgb[0],
rgb[1],
rgb[2],
max,
min);
hsv[1] =
saturation;
hsv[2] =
max;
return
hsv;
}
}