Simple Animated sprite

AnimatedCharacter.pde

PAnimation front, up, side;


void setup() {
  //size(640, 480);
  front = new PAnimation("front.png", 37, 90, 100);
  up = new PAnimation("up.png", 40, 90, 100);
  side = new PAnimation("side.png", 53, 90, 100);
}
void draw() {
  background(0);
  front.display();
  translate(0, 90);
  up.display();
  translate(0, 90);
  scale(3);
  side.display();
}

class PAnimation {
  PImage spriteSheet;
  int animationLength, w, h;
  float speed = 1000;
  int lastFrame = 0;
  int animCounter = 0;
  
 PAnimation(String filename, int spriteWidth, int spriteHeight, float animationSpeed) {
   spriteSheet = loadImage(filename);
   w = spriteWidth;
   h = spriteHeight;
   animationLength = spriteSheet.width / w;
   speed = animationSpeed;
   
 }
 
 void display() {
   if (millis() - lastFrame > speed) {
    animCounter++;
    animCounter %= animationLength;
    this.lastFrame = millis();
  }
  int uv = w * animCounter;
  
  image(spriteSheet, 0, 0, w, h, uv, 0, uv + w, h);
 }
 
}