当调整JFrame的大小时，在JFrame上调整图像和JPanel的大小

Question

I have made a jframe which contain three jpanel ,these three panel devides the jframe into three equal parts. each panel contain an image.I want to resize the images and panel when frame get resizes from heigher to lower size.Can anybody tell how can i do it please.

Answer 1

Put image as:

1. Icon / ImageIcon to the JLabel
2. you can use paintComponent for JComponent or JPanel with getWidth and getHeight instead of fixed size in pixels
3. instead of thinking about resize, use proper LayoutManager for placing JPanels or JLabels with image to the JFrame , eg GridLayout could be the easiest of the ways.

Answer 2

I solved this problem a few years back. Was just looking for the code but I couldn't find it.

Essentially, the answer is you use a ComponentListener to see when your Frame (or probably better, put one on each of your panels) has changed size. Then you can resize the image appropriately. I did this with BufferedImages. Using regular Image you need to create a new Image and draw the old image on the new one, but scaled. (use image.getGraphics and Graphics.drawImage )