Multiple Images Dragged on a JPanel

Question

I am trying to add multiple BufferedImages to a JPanel. I can get one BufferedImage on there fine by creating my own class which overrides JPanel, and then in the paintComponent(Graphics g) method, I have a method with g.drawImage(image, npx, npy, null); to draw the image on the panel.
So that works fine for one image. I have also implemented a MouseMotionAdapter so I can drag the image around. However I am having GREAT difficulty implementing it with multiple images. I cannot workout how to do this. I am aware I need to have an ArrayList containing all the images, but I cannot determine how I am to loop through each one, getting the correct image, then moving that one.
Please help with some useful code. (I can provide mine if required).
Kelvin

Answer 1

803539 wrote:
Hi pierrot_2,
I'm not yet. I'm not yet, I was thinking I would just have to loop through the list of images, getting the correct image (by a method unknown yet) and then calling the drawImage() method, passing the selected image as a parameter.Kelvin, take your project one step at a time. The first thing I would do is try painting all four images first. You can do it quickly by having a Point[] array along side of a BufferedImage[] array. Lets's say the images are w=200, h=160 for now.
BufferedImage[] images = new BufferedImage[4];
Point[] locations = new Point[4];
locations[0] = new Point(0, 0);
locations[1] = new Point(200, 0);
locations[2] = new Point(0, 160);
locations[3] = new Point(200, 160);
// paintComponent
for(int i = 0; i < images.length; i++)}
  BufferedImage bi = images;
Point p = locations[i];
g.drawImage(bi, p.x. p.y, null);
}Use something like the code above to get you started. Kelvin, there are much better ways to do this, but for now see if you can paint all your images on the JPanel first, using nothing but <tt> images </tt>and<tt> locations </tt>as described. Later, you may want to switch to Rectangles. See how the FOR loop will call<tt> drawImage() </tt>four times. See how the Point objects are being used to position the image being painted? Do this BEFORE you try to move them around the canvas. Call home if you have troubles.