Resize drawing to match frame size

Question

I\'ve written an app that custom draws everything inside paint() based on fixed pixel positions. Then I disabled resize of the frame so its always visible.

However,

Answer 1

Assuming you rename your method that paints for 300x300 as paint300, define a buffered image:

@Override public void paint(Graphics g) {
     Image bufferImage = createImage(300, 300);  // empty image
     paint300(bufferImage.getGraphics());  // fill the image
     g.drawImage(bufferImage, 0, 0, null);  // send the image to graphics device
}

Above is when you want to draw at full size (300x300). If your window is resized:

@Override public void paint(Graphics g) {
     Image bufferImage = createImage(300, 300);  
     paint300(bufferImage.getGraphics());
     int width = getWidth();
     int height = getHeight(); 
     CropImageFilter crop = 
         new CropImageFilter((300 - width)/2, (300 - height)/2 , width, height);
     FilteredImageSource fis = new FilteredImageSource(bufferImage, crop);
     Image croppedImage = createImage(fis);
     g.drawImage(croppedImage, 0, 0, null);
}

The new classes are from from java.awt.image.*.

I didn't test this code. It's just to send you in the right direction.