/**
 * Distance
 * By Raphael Rouvinov-Kats
 * 
 * Made in like 2016/2017 but accidentally pressed save Feb 19 2021
 * */

frameRate(0);

var heat = function(posX, posY) {
    if (!this.loadPixels) { return; }
    this.loadPixels();
    var pix=this.imageData.data;
    
    var l = 401 * 401;
    while(l--) {
        var x = l % 401;
        var y = (l-x)/401;
        
        var dx = posX - x;
        var dy = posY - y;
        var d = sqrt(dx*dx + dy*dy);
        d = map(d, 0, sqrt(width*width+height*height), 0, 255);
        
        var ind = (x + y * 400) << 2;
        pix[ind]   = 255-d;
        pix[ind+1] = 64-d/4;
        pix[ind+2] = 64-d/4;
    }
    
    this.updatePixels();
};

var mouseDragged = function() {
    heat(mouseX, mouseY);
};

heat(width/2, height/2);