/**
 * Drawing a star.
 *
 * <p>Elie Zananiri<br>
 * CART 253, Winter 2008</p>
 */

void setup() {
  size(400, 400);
  smooth();
  noStroke();
}

void draw() {
  // draw a semi-transparent rect to cover the whole canvas
  // this will give the stars that "fading" effect
  fill(0, 10);
  rect(0, 0, width, height);
  
  // draw a star at the current mouse position with size relative to the mouse movement
  fill(216, 61, 4);
  int avgMove = int((abs(pmouseX-mouseX)+abs(pmouseY-mouseY))/2);
  drawStar(mouseX, mouseY, avgMove*5); 
}

void drawStar(int xPos, int yPos, int starSize) {
  beginShape();
  vertex(xPos, yPos-starSize/2);
  vertex(xPos-starSize/3, yPos+starSize/2);
  vertex(xPos+starSize/2, yPos-starSize/8);
  vertex(xPos-starSize/2, yPos-starSize/8);
  vertex(xPos+starSize/3, yPos+starSize/2);
  vertex(xPos, yPos-starSize/2);
  endShape();
}