vectors processing
// Instead of a bunch of floats, we now just have two PVector variables.
PVector location;
PVector velocity;
void setup() {
size(200,200);
smooth();
background(255);
location = new PVector(100,100);
velocity = new PVector(2.5,5);
}
void draw() {
noStroke();
fill(255,10);
rect(0,0,width,height);
// Add the current speed to the location.
location.add(velocity);
// We still sometimes need to refer to the individual components of a PVector
// and can do so using the dot syntax (location.x, velocity.y, etc.)
if ((location.x > width) || (location.x < 0)) {
velocity.x = velocity.x * -1;
}
if ((location.y > height) || (location.y < 0)) {
velocity.y = velocity.y * -1;
}
// Display circle at x location
stroke(0);
fill(175);
ellipse(location.x,location.y,16,16);
}