void setup() {
	size(200,200);
	smooth();
}

void draw() {
	background(255);
	PVector mouse = new PVector(mouseX,mouseY);
	PVector center = new PVector(width/2,height/2);
	mouse.sub(center);
	mouse.mult(0.5);
	translate(width/2,height/2);
	line(0,0,mouse.x,mouse.y);  
}