Game-Tank01

float xtank = 100, ytank = 500, tankspeed = 2.5;
boolean isfire = false;
float xfire, yfire, firespeed = 5, firer = 10;

void setup(){
  size(900, 900);
}

void draw(){
  background(204, 216, 42);
  fill(50, 142, 30);
  rect(xtank, ytank, 120, 120);
  fill(140, 67, 155);
  ellipse(xtank + 60, ytank, 80, 80);
  fill(193, 66, 77);
  rect(xtank + 50, ytank - 100, 20, 100);

  if (keyPressed){
    if (keyCode == UP){
      ytank = ytank - tankspeed;
    } else if (keyCode == DOWN){
      ytank = ytank + tankspeed;
    } else if (keyCode == LEFT){
      xtank = xtank - tankspeed;
    } else if (keyCode == RIGHT){
      xtank = xtank + tankspeed;
    }
  }

  if (ytank < height / 2){
    ytank = height / 2;
  }
  if (ytank > height - 120){
    ytank = height - 120;
  }
  if (xtank < 0){
    xtank = 0;
  }
  if (xtank > width - 120){
    xtank = width - 120;
  }

  if (keyPressed && key == ' ' && !isfire){
    isfire = true;
    xfire = xtank + 60;
    yfire = ytank - 100;
  }

  if (isfire){
    fill(255, 0, 0);
    ellipse(xfire, yfire, 2*firer, 2*firer);
    yfire = yfire - firespeed;
    if (yfire < 0){
      isfire = false;
    }
  }
}