Getting started with Drawing and the 2D API

Question

I'm trying to integrate some drawing functionality into my program.

I have a JLabel that has an image set on it.

I want to write a method to return my image:

public Graphics getImage(){
    Graphics g = currentImage;
    return g
}

But I don't know how to convert it from a JLabel to a graphics object. Then as a simple test I want to draw a line on this image:

public void paint(Graphics g) {  
    g.drawLine(20, 500, 700, 600);
}

Some help with getting started on this would be great.

Answer 1

I have a JLabel that has an image set on it.

Create a copy of the image (BufferedImage image2..) and put image2 in the label.

When you need to draw, call image2.getGraphics() for a Graphics object, or image2.createGraphics() for a Graphics2D object.

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See this answer for examples of creating and using images.

Answer 2

Override paintComponent(Graphics g) method of JLabel and place all the drawing code there.