Your while (true) is blocking the Swing event thread putting the application to sleep. For simple animation and game loop, use a Swing Timer. If you have long running code that needs to be in the background, then use a background thread such as a SwingWorker, but taking care to make sure that all calls … Read more
The original author of the PNGImage component (the basis of the Delphi native component) had a forum where he, and others, posted code snippets on how to do things using the PNGImage component. Before the forum was taken down I grabbed a copy of all of the code snippets and placed them on the CodeGear … Read more
Never override paint() in JPanel rather paintComponent(..) Im not quite sure I understand however I made a short example which I hope will help. Basically it is a simple JFrame with a DrawingPanel (my own class which extends JPanel and the shapes are drawn on). This panel will create shapes (only 2 for testing) add … Read more
This is pretty easy to do in Winforms. What you need is a sandwich of two forms. The bottom one should provide the transparent gradient background, the top one should draw the icons and handle mouse clicks. Some sample code: public partial class Form1 : Form { public Form1() { InitializeComponent(); this.TopMost = true; this.FormBorderStyle … Read more
Don’t use paint, use paintComponent and don’t forget to call super.paintComponent JComponent may not be the best choice, JPanel is probably a better choice What’s wrong with Graphics#fillRect(int, int, int, int)? You might to take a look at Performing Custom Painting and 2D Graphics for more details. I’d advice against trying to have a second … Read more
I will propose an answer that works fast and perfectly if you are looking for exact match both in size and in image values. The idea is to calculate a brute force search of the wanted h x w template in a larger H x W image. The bruteforce approach would consist in looking at … Read more
There are two “usual” ways of “controlling” framerate, and neither is quite that simple. The first and more controlling of the two, and something that is usually optional, is VSync. This forces the video card to only push out a new frame when the monitor is done refreshing. Many monitors refresh at 60 Hz, so … Read more
If I’ve understood your question correctly, you essentially want to work out the new size of an image once rotated, and how to position the rotated image in it’s new bitmap. The diagram hopefully helps make clear the solution. Here is a bit of pseudo code: sinVal = abs(sin(angle)) cosVal = abs(cos(angle)) newImgWidth = sinVal … Read more
Suggestions: Don’t use Canvas as you shouldn’t mix AWT with Swing components unnecessarily. Instead use a JPanel or JComponent. Don’t get your Graphics object by calling getGraphics() on a component as the Graphics object obtained will be transient. Draw in the JPanel’s paintComponent() method. All this is well explained in several tutorials that are easily … Read more