p5_js_overlay.js

				p = []
				lastMouse = false;
				function setup(){
					resetDrawing();
				}

				function draw(){
					if(mouseIsPressed()){
						p[p.length-1].push({x: mouseX, y: mouseY});
						lastMouse = true;
					} else {
						if(lastMouse){
							p.push([]);
						}
					}

					stroke(255);
					strokeWeight(2);

					for(var i = 0; i < p.length; i++){
						beginShape();
						for(var j = 0; j < p[i].length; j++){
							vertex(p[i][j].x, p[i][j].y);
						}
						endShape();
					}
				}

				function resetDrawing(){
					p = [];
					p.push([]);
					c = $("canvas")[0]
					c.width = c.width;
					background(0,125);
				}

				function keyPressed(){
					if(key == ' '){
						resetDrawing();
					}
				}