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I'm trying to develop some sort of paint using Java.
I have a JComponent that is located inside of a JPanel.
I already can draw lines and rectangles into that JComponent.
Now, how can I export this drawings as an image (png, gif, jpg)?
I tried this:
BufferedImage b = new BufferedImage(1700,1100,BufferedImage.TYPE_INT_RGB);
this.print(getGraphics());
try{ImageIO.write(b,"png",new File("test.png"));}catch (Exception e) {}
But that only creates a .png file all black.
Help!!!
RESOLVED!!!
BufferedImage bi = new BufferedImage(this.getSize().width, this.getSize().height, BufferedImage.TYPE_INT_ARGB);
Graphics g = bi.createGraphics();
this.paint(g); //this == JComponent
g.dispose();
try{ImageIO.write(bi,"png",new File("test.png"));}catch (Exception e) {}
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Create BufferedImage to store your painting. When you paint, paint on BufferedImage. When you need to display paint on JPanel, draw BufferedImage on JPanel. This way, you can load / save painting to file.
To add an image to JPanel, the Java Swing framework provides built-in classes such as ImageIO and ImageIcon that you can use to fetch an image.
First of all, print() is the incorrect method.
What I guess should work (haven't tested it yet) is:
get the BufferedImage's Graphics (b.createGraphics()) and use that graphics object to paint() your panel/component.
(e.g. yourPanel.paint(b.createGraphics());)
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