Correctly calculate cnavas point.

src/main/java/lab/BulletAnimated.java

@@ -42,7 +42,7 @@ public class BulletAnimated  {
 
 	public void draw(GraphicsContext gc) {
 		gc.save();
-		Point2D canvasPosition = world.getCanvasPoint(position);
+		Point2D canvasPosition = world.getCanvasPoint(position, size);
 		gc.drawImage(image, canvasPosition.getX(), canvasPosition.getY());
 		gc.restore();
 	}

src/main/java/lab/Cannon.java

@@ -32,7 +32,7 @@ public class Cannon {
 	
 	public void draw(GraphicsContext gc) {
 		gc.save();
-		Point2D worldPosition = world.getCanvasPoint(position);
+		Point2D worldPosition = world.getCanvasPoint(position,0);
 		gc.setFill(Color.BROWN);
 		gc.fillRect(worldPosition.getX()-10, worldPosition.getY()+size.getY(), size.getX()+20, size.getY()/2);
 		gc.fillOval(worldPosition.getX()-20, worldPosition.getY()+size.getY()/2, 40, 40);

src/main/java/lab/World.java

@@ -16,8 +16,8 @@ public class World {
 		bulletAnimatted = new BulletAnimated(this, cannon, new Point2D(30, 60), new Point2D(0, 0), 40);
 	}
 
-	public Point2D getCanvasPoint(Point2D worldPoint) {
-		return new Point2D(worldPoint.getX(), height - worldPoint.getY());
+	public Point2D getCanvasPoint(Point2D worldPoint, double heightOfEntity) {
+		return new Point2D(worldPoint.getX(), height - worldPoint.getY() - heightOfEntity);
 	}
 
 	public void draw(GraphicsContext gc) {