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  Vapor Trails in Graphics2D  (Read 747 times)
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Offline Dreamcatchermatt

Junior Duke





« Posted 2010-05-18 21:45:46 »

Is it possible to apply a gradiant to a line or poligon's Stroke?

Basicaly, I have a chain of lines ( myGraphics.DrawLine( ... ) ) that points out of the back of my projectile, and I want to gradient it between Color X and transparrent.

I dont want to use particals for this (in most instances) right now, as it just has to be very simple, and I have not written a partical engine yet  Smiley

For screenshots of what I have at the moment, Please see my Journal for this project.
Offline zoto

Senior Duke


Medals: 4



« Reply #1 - Posted 2010-05-18 22:13:29 »

Quote
Is it possible to apply a gradiant to a line or poligon's Stroke?
yes, try the GradientPaint class. Here is a simple demo.

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import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;

import javax.swing.JFrame;


public class GradientTest extends JFrame {
   static final Color TRANSPARENT = new Color(0, 0, 0, 0);
   Line2D line = new Line2D.Float(50, 30, 200, 300);
   Color colorX = new Color(255, 100, 100);
   
   public GradientTest() {
      setPreferredSize(new Dimension(400, 300));
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      pack();
      setVisible(true);
   }
   
   public void paint(Graphics g) {
      Graphics2D g2 = (Graphics2D)g;
      GradientPaint gradient = new GradientPaint(line.getP1(), colorX, line.getP2(), TRANSPARENT, false);
      g2.setPaint(gradient);
      g2.draw(line);
      g2.dispose();
   }
   
   public static void main(String[] args) {
      new GradientTest();
   }

}
Offline Dreamcatchermatt

Junior Duke





« Reply #2 - Posted 2010-05-18 22:40:36 »

cool, thanks, I'll try that.

I've been having a little troubble understanding how all the abstract classes in the Graphics2D are 'spozed to work together. I guess I'll figure it out in time.
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Offline Dreamcatchermatt

Junior Duke





« Reply #3 - Posted 2010-05-20 12:57:50 »

Hi, just to update, I got it working fine now.

It was a terrible mistake - I'd got a stuff.getX() insted of a stuff.getY() hidden away in my code. once i found that, the gradients draw perfectly!

Thanks  Smiley
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