Button that Draws to canvas

**Rylogy** · 02-10-2012, 05:13 PM

Hello Java Forums,

I've been searching a lot on how to draw on canvas and it seems more complicated than I was hoping for. My issue is that I keep running into this code that doesn't help me with what I'm trying to figure out.

Does anyone have any suggestions on how to have some lines get drawn once I push a button?

I keep noticing in example codes that some class extends to a JFrame and then some paint class is declared and there's where code like g.drawLine(int,int,int,int) appears.
How do I make this work with my GUI application?

**camickr** · 02-10-2012, 05:46 PM

Start with: Lesson: Performing Custom Painting (The Java™ Tutorials > Creating a GUI With JFC/Swing) for the basics of painting.

**Rylogy** · 02-10-2012, 05:51 PM

Oh wow. I'll take a good look at this tutorial.
Thank you very much.

**DarrylBurke** · 02-10-2012, 09:01 PM

Moving to AWT/Swing

db

**Rylogy** · 02-11-2012, 01:29 AM

I'm not sure I follow.

Originally Posted by DarrylBurke

Moving to AWT/Swing

db

**Rylogy** · 02-11-2012, 02:39 AM

Well, I'm still having issues getting this to work at all. How do I "delegate" the painting to my button? How can I make it so when I press a button, my canvas or panel gets drawings on them?

**Norm** · 02-11-2012, 02:56 AM

You need to add an action listener to the button. When the action listener is called, it will create instructions for the paintComponent method and call the repaint method. When the JVM calls the paintComponent method, it should look at the instructions left by the action listener and draw what was requested.