Shape drawing controlled by mouse

Question

How can we draw the shapes in Java like we do in paint?

For example if I want to draw the rectangle this command will draw it:

g2.fill3DRect(mt, mf, 45, 45, true);

But how can I increase the or decrease the size of an object or shape during run-time using mouse like we did in paint?

Side note. People typically recommend overriding `paint()` or `paintComponent()` & using that `Graphics` object to paint to. Here are 2 examples ([1](http://stackoverflow.com/a/10055672/418556), [2](http://stackoverflow.com/a/10055306/418556)) that instead use a `BufferedImage`. We can grab the graphics object direct from the image, in order to do 'custom painting'. — Andrew Thompson, Apr 07 '12 at 17:07

score 1 · Accepted Answer · edited Apr 07 '12 at 17:03

1

Use a mouse listener to get the position of the mouse after it has been pressed. i.e.

g2.fill3DRect(mt, mf, mouse.getX(), mouse.getY(), true);

But clear the screen by drawing a rectangle over the entire screen before each draw so that there's not a million rectangles at the same time. This is the most basic example of course. Look into double buffering and practice.

edited Apr 07 '12 at 17:03

Andrew Thompson

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answered Apr 07 '12 at 16:55

ghostbust555

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score 0 · Answer 2 · answered Apr 07 '12 at 16:50

Implement a shape object that holds the attributes of the shape.

Your Panel should maintain a List of shapes that it draws when it needs to. Also one shape can be attached to the mouse.

Then register a mouselistener to your panel that will:

update your shape and redraw the panel if you move the mouse.
creates a new shape when you mouseDown
releases the shape when you mouseUp

Shape drawing controlled by mouse

2 Answers2