get Red Green Gradient - Java 2D Graphics

Java examples for 2D Graphics:Color

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Description

get Red Green Gradient

Demo Code



public class Main{
    /**//w  w  w.  ja  va  2  s .  co m
     * 
     * @param min
     * @param max
     * @param value
     * @return
     */
    public static int getRedGreenGradient(float min, float max, float value) {
        int blue = 0x0;
        int red;
        int green;

        // Make sure that min < max
        if (min > max) {
            value = (max - value) + min;

            final float temp = min;
            min = max;
            max = temp;
        }

        // Make sure that value is in (min,max) range
        value = (value < min) ? min : value;
        value = (value > max) ? max : value;

        final float difference = max - min;
        final float middleValue = (difference / 2) + min;

        if (value <= middleValue) {
            // Range from 0xFF0000 [red] to 0xFFA500 [orange]
            red = 0xFF;
            green = Math.round(((0xA5 - 0x00) / (difference / 2))
                    * (value - min));
        } else {
            // Range from 0xFFA500 [orange] to 0x00FF00 [green]
            red = 0xFF - Math.round(((0xFF - 0x00) / (difference / 2))
                    * (value - middleValue));
            green = 0xA5 + Math.round(((0xFF - 0xA5) / (difference / 2))
                    * (value - middleValue));
        }

        // System.out.println("r: " + Integer.toHexString(red) + " g: " + Integer.toHexString(green) + " b: " + Integer.toHexString(blue));

        final int color = (red << 16) + (green << 8) + blue;

        return color;
    }
    /**
     * 
     * @param min
     * @param max
     * @param value
     * @param alpha
     * @return
     */
    public static int getRedGreenGradient(float min, float max,
            float value, int alpha) {
        final int color = (alpha << 24)
                + ColorGradientHelper.getRedGreenGradient(min, max, value);

        return color;
    }
}

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