Render graphics using Doubles in Graphics2D

Question

Currently, I have a JFrame for my game to render in, and I'm using Graphics2D for drawing (The games graphics are fairly simple 2D sprites). However, my delta variable is a double, and all of the Graphics 2D methods (And Grpahics) use int. I tried to type cast the delta to an int, but it just rounds down to 0. So my question is, how can I render graphics using Graphics2D in Java with coordinates that are doubles. Can I convert it to work with Graphics2D if there is no built in way? Or, is there a graphics library that can support doubles for coordinates?

Answer 1

Graphics class uses integer coordinates for all operations, but Graphics2D provides API with float and double accuracy. You can use Graphics2D.draw(Shape) and Graphics2D.fill(Shape) to get sub-pixel accuracy in rendering. You should also probably enable antialiasing for the Graphics2D object.

public void paintComponent(Graphics graphics) {
    Graphics2D g = (Graphics2D)graphics;
    g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g.draw(new Line2D.Double(10.5, 10.5, 20.5, 20.5));
}

Alternatively you can scale, rotate and translate Graphics2D object or manipulate the AffineTransform directly. This might be needed if you want to draw images to double coordinates.