Project 7 – Interactive Curve

//hollyl
//composition with curves
//section D
var nPoints = 150;

function setup(){
	createCanvas(480, 480);
}

function drawCartiod(){
	var x;
	var y;

	var a = 15;
	var b = a/2;
	var h = constrain(mouseY/50, 0, b);
	var ph = mouseX/50;

	fill(200, 255, 200);
	beginShape();
	for(var i=0; i<nPoints; i++){
		var t=map(i, 0, nPoints, 0, TWO_PI);

		x = (a+b)*cos(t) * (h-cos(ph+t*(a+b)/b));
		y = (a+b)*sin(t) * (h-cos(ph+t*(a+b)/b));
		vertex(x, y);
	}
	endShape(CLOSE);
}

function draw(){
	background(255);
	push();
	translate(width/2, height/2);
	drawCartiod();
	pop();
}