做期末作品

PImage imgBG, imgMAN;
void setup() {
  size(788, 857);
  imgBG=loadImage("bg.jpg");
  imgBG.loadPixels();
}
float userX=390, userY=480, bgX=0, bgY=0, a=0, b=0;
void draw() {
  image(imgBG, bgX, bgY);
  ellipse(userX, userY, 30, 30);fill(255,255,0);
  if (keyPressed && keyCode==UP) {
    userY-=2;
  } else if (keyPressed && keyCode==DOWN) {
    userY+=2;
  } else if (keyPressed && keyCode==RIGHT) {
    userX+=2;
  } else if (keyPressed && keyCode==LEFT) {
    userX-=2;
  }
  println(green(imgBG.pixels[int(userX-bgX)+int(userY-bgY)*imgBG.width]));
  if (green(imgBG.pixels[int(userX-bgX)+int(userY-bgY)*imgBG.width])>0)
  {
   println("OK");
  }
}