can we zoom in zoom out the drawing we draw on the Canvas?

Question

We have an old (more than 10yrs old) Java Swing applicatin which draws lots of circles and connections (lines) between those circles on a JCanvas (a subclass of JComponent) based on lab data.

Because the data becames bigger and bigger, we cannot display the entire drawing now. We have put the JCavans into a JScrollPane but it is not convenience to scroll the drawing.

Can we add zoom in zoom out for it? if yes, how? I know we can zoom image but the drawing on Canvas is an image?

thanks,

EDIT:

we draw those circles and line with Graphics within paintComponent(Graphics g) method.

Answer 1

Without knowing anything about your application it's hard to provide useful advice (adding a code snippet or better yet a cutdown example app would be helpful to show how things are being drawn), but I'll give it a shot:

Why don't you multiply the x,y and width,height values by a scaling factor before you draw each circle/line? I assume that somewhere your canvas is using a Graphics object to draw each shape?

Answer 2

You could apply a scaling Transform to the Graphics2D object passed to the paintComponent method. You can learn how to use it in the Java 2D programming trail.