Points on a circle may be specified as a function of the angle θ: x = a + r cos(θ) y = b + r sin(θ) Here, increments of 2π/8 are shown. Addendum: As suggested in a comment by @Christoffer Hammarström, this revised example reduces the number of magic numbers in the original. The desired … Read more
The (very) short answer to your question is that paintComponent is called “when it needs to be.” Sometimes it’s easier to think of the Java Swing GUI system as a “black-box,” where much of the internals are handled without too much visibility. There are a number of factors that determine when a component needs to … Read more
AWT, override paint(). Swing top-level container (e.g.s are JFrame, JWindow, JDialog, JApplet ..), override paint(). But there are a number of good reasons not to paint in a TLC. A subject for a separate question, perhaps. The rest of Swing (any component that derives from JComponent), override paintComponent(). Neither override nor explicitly call paintComponents(), leave … Read more
First off, use Swing KeyBindings Also I see no real need for multi-threadung unless you want your game multi-threaded. To clarify the problem is you need to be able for 2 players to press different keys? If so: Solution: Simply use booleans to flag whether or not a key is pressed down, you would than … Read more
And please no win32, mfc or qt. I fear these are too complex for me for now, unless you really recommend it. Doing graphics without some kind of framework is actually a lot harder than using any one of the frameworks that you have listed. Orders of magnitude harder … if you could measure hardness … Read more
Basically, you draw what ever you want around the center of the component, based on it’s width and height public void paintComponent(Graphics g) { super.paintComponent(g); int width = getWidth() – 1; int height = getHeight() – 2; g.drawLine(width / 2, 0, width / 2, height); g.drawLine(0, height / 2, width, height / 2); } Check … Read more
One way is to make your Ball class an actual Swing component. Then you can use the ComponentMover class. Edit: how do you make a class into a swing component Basically, you move your draw(…) code into the paintComponent() method of JComponent. Here is a simple example that does all the custom painting for you … Read more