Project 7 Curves Composition

//tjchen 
// section a 
// 07 project composisiton with curves
var t = 0
var numPoints = 100;// global set up of num of points on circle
var lineX = [];
var lineY = [];
var lineX2 = [];
var lineY2= [];
function setup() {
    createCanvas(480, 480);
    background(0);
    strokeWeight(1);
    stroke(255);
    noFill();
}


function draw() {
    background(0);
    translate(width/2,height/2)
    stroke(255,0,0);
    draw_hypotrochoid_1(t);
    stroke(0,255,0);
    draw_hypotrochoid_2(t);
    t+=1; 
}


function draw_hypotrochoid_1(t){
    var a = 150; // radius of large circle 
    var b = 8; // radius of spinning circle 
    var h = mouseY/10; // location of fixed point 
    var xH= (a-b) * cos (radians(t)) + h * cos(((a-b)/b)*(radians(t)));
    var yH = (a-b) * sin (radians(t)) - h * sin(((a-b)/b)*(radians(t))); 
    circle(xH,yH,10);;
    lineX.push(xH);
    lineY.push(yH);
    if (radians(t)>4*PI){ // 4 trips around the circle before redrawing circle 
        lineX.shift();
        lineY.shift();
    }
    strokeWeight(1);
    for (i=0; i < lineX.length-1; i++){
        line(lineX[i], lineY[i], lineX[i+1], lineY[i+1]);
    }


} 

function draw_hypotrochoid_2(t){
    var a2 = 200; // radius of large circle 
    var b2 = 8; // radius of spinning circle 
    var h2 = mouseX/10; // location of fixed point 
    var xH2= (a2-b2) * cos (radians(t)) + h2 * cos(((a2-b2)/b2)*(radians(t)));
    var yH2 = (a2-b2) * sin (radians(t)) - h2 * sin(((a2-b2)/b2)*(radians(t))); 
    circle(xH2,yH2,10);;
    lineX2.push(xH2);
    lineY2.push(yH2);
    if (radians(t)>4*PI){ // 4 trips around the circle before redrawing circle 
        lineX2.shift();
        lineY2.shift();
    }
    strokeWeight(1);
    for (i=0; i < lineX2.length-1; i++){
        line(lineX2[i], lineY2[i], lineX2[i+1], lineY2[i+1]);
    }


}