/*
* Copyright 2014-2017 See AUTHORS file.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Utility class borrowed from Vis-UI.
*/
package com.rafaskoberg.gdx.typinglabel.utils;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.math.MathUtils;
/**
* Utilities for converting between RGB and HSV color systems.
*
* @author Kotcrab
* @since 0.6.0
*/
public class ColorUtils {
/**
* Converts HSV to RGB
*
* @param h hue 0-360
* @param s saturation 0-100
* @param v value 0-100
* @param alpha 0-1
* @return RGB values in LibGDX {@link Color} class
*/
public static Color HSVtoRGB(float h, float s, float v, float alpha) {
Color c = HSVtoRGB(h, s, v);
c.a = alpha;
return c;
}
/**
* Converts HSV color system to RGB
*
* @param h hue 0-360
* @param s saturation 0-100
* @param v value 0-100
* @return RGB values in LibGDX {@link Color} class
*/
public static Color HSVtoRGB(float h, float s, float v) {
Color c = new Color(1, 1, 1, 1);
HSVtoRGB(h, s, v, c);
return c;
}
/**
* Converts HSV color system to RGB
*
* @param h hue 0-360
* @param s saturation 0-100
* @param v value 0-100
* @param targetColor color that result will be stored in
* @return targetColor
*/
public static Color HSVtoRGB(float h, float s, float v, Color targetColor) {
if(h == 360) h = 359;
int r, g, b;
int i;
float f, p, q, t;
h = (float) Math.max(0.0, Math.min(360.0, h));
s = (float) Math.max(0.0, Math.min(100.0, s));
v = (float) Math.max(0.0, Math.min(100.0, v));
s /= 100;
v /= 100;
h /= 60;
i = MathUtils.floor(h);
f = h - i;
p = v * (1 - s);
q = v * (1 - s * f);
t = v * (1 - s * (1 - f));
switch(i) {
case 0:
r = MathUtils.round(255 * v);
g = MathUtils.round(255 * t);
b = MathUtils.round(255 * p);
break;
case 1:
r = MathUtils.round(255 * q);
g = MathUtils.round(255 * v);
b = MathUtils.round(255 * p);
break;
case 2:
r = MathUtils.round(255 * p);
g = MathUtils.round(255 * v);
b = MathUtils.round(255 * t);
break;
case 3:
r = MathUtils.round(255 * p);
g = MathUtils.round(255 * q);
b = MathUtils.round(255 * v);
break;
case 4:
r = MathUtils.round(255 * t);
g = MathUtils.round(255 * p);
b = MathUtils.round(255 * v);
break;
default:
r = MathUtils.round(255 * v);
g = MathUtils.round(255 * p);
b = MathUtils.round(255 * q);
}
targetColor.set(r / 255.0f, g / 255.0f, b / 255.0f, targetColor.a);
return targetColor;
}
/**
* Converts {@link Color} to HSV color system
*
* @return 3 element int array with hue (0-360), saturation (0-100) and value (0-100)
*/
public static int[] RGBtoHSV(Color c) {
return RGBtoHSV(c.r, c.g, c.b);
}
/**
* Converts RGB to HSV color system
*
* @param r red 0-1
* @param g green 0-1
* @param b blue 0-1
* @return 3 element int array with hue (0-360), saturation (0-100) and value (0-100)
*/
public static int[] RGBtoHSV(float r, float g, float b) {
float h, s, v;
float min, max, delta;
min = Math.min(Math.min(r, g), b);
max = Math.max(Math.max(r, g), b);
v = max;
delta = max - min;
if(max != 0)
s = delta / max;
else {
s = 0;
h = 0;
return new int[]{MathUtils.round(h), MathUtils.round(s), MathUtils.round(v)};
}
if(delta == 0)
h = 0;
else {
if(r == max)
h = (g - b) / delta;
else if(g == max)
h = 2 + (b - r) / delta;
else
h = 4 + (r - g) / delta;
}
h *= 60;
if(h < 0)
h += 360;
s *= 100;
v *= 100;
return new int[]{MathUtils.round(h), MathUtils.round(s), MathUtils.round(v)};
}
}
