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.

possible duplicate of [How to draw on a JLabel?](http://stackoverflow.com/questions/8466030/how-to-draw-on-a-jlabel) — trashgod, Dec 12 '11 at 15:14

score 5 · Accepted Answer · answered Dec 12 '11 at 13:33

5

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

answered Dec 12 '11 at 13:33

StanislavL

But I don't have a paintComponent Method. I only have: myJLabel.setIcon(imageLocation); ? – James MV Dec 12 '11 at 13:40
If the label contains an image, draw direct to the image rather than extend `JLabel`. – Andrew Thompson Dec 12 '11 at 13:50
2

All Swing components implement a paintComponent() method. – camickr Dec 12 '11 at 15:37

score 3 · Answer 2 · edited May 23 '17 at 10:32

3

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.

See this answer for examples of creating and using images.

edited May 23 '17 at 10:32

Community

answered Dec 12 '11 at 13:42

Andrew Thompson

2 Answers2