Color Strategy

Color Strategy is a PixelStrategy to validate if a pixel have some color or not.

First of all, color here is represented as an int:

int rgb = 0xFF3322;

r = (rgb >> 16) & 0xFF;
g = (rgb >> 8) & 0xFF;
b = (rgb)      & 0xFF;

The ColorStrategy compares the r,g and b values to the desired color with a tolerance.

See the method isColor below:

    public static boolean isColor(int rgb, int color, int minTolerance, int maxTolerance) {
		
        int r = getRed(rgb);
        int g = getGreen(rgb);
        int b = getBlue(rgb);
		
        int cr = getRed(color);
        int cg = getGreen(color);
        int cb = getBlue(color);

        if((r>=cr-minTolerance)&&(r<=cr+maxTolerance)&&
        (g>=cg-minTolerance)&&(g<=cg+maxTolerance)&&
        (b>=cb-minTolerance)&&(b<=cb+maxTolerance)) {
            return true;
        }
		
        return false;
		
    }

isColor returns true only if the red channel of rgb is in the interval color.red-minTolerance ~ color.red+maxTolerance, the same is applied to green and blue channels.