Soft Paint Bucket Fill: Colour Equality

Question

I\'m making a small app where children can fill preset illustrations with colours. I\'ve succesfully implemented an MS-paint style paint bucket using the flood fill argorith

Answer 1

well, i guess the most natural approach is to calculate the difference between to colors. to achieve a sensible value, one should calculate the difference per channel. haven't tested it, but the following should work:

const perChanThreshold:uint = 5;
const overallThreshold:uint = perChanThreshold * perChanThreshold * 3;
function match(source:uint, target:uint):Boolean {
    var diff:uint = 0, chanDiff:uint;
    for (var i:int = 0; i < 3; i++) {
        chanDiff = (source >> (i * 8)) & 0xFF;
        diff += chanDiff * chanDiff;
    }
    return diff <= overallThreshold;
}