Improving performance via buffered image

Hi,
I'm new-ish to java2D and have a question on improving the performance of my not massively graphics intensive app.
Basically at the moment I do all my drawing by subclassing a JPanel, overriding the paintComponent()method and drawing straight to the graphics object passed in.
my question is is this a sound approach? would I get better performance by creating a buffered image, doing my updates to that and THEN updating the actual display in one hit using it? any other performance tips?
Thanks in advance.
p.s. has anyone had any big performance nasties happening when drawing graphics on multi-monitor displays? or is it justt me?

Is the performance satisfactory? Perhaps you're just curious, or perhaps you are unhappy with performance...
Are you refreshing your display often -- several times a second -- or only occassionally?
Is your paintComponent method expensive? Are you doing number crunching of you own there,
or are you doing a lot of graphics work -- thousands of cubic parametric curves, say?
There is no one-size-fits-all solution to rendering performance, so you are going to have to be more specific,
if you want the help you get here to be relevant.

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Only problem is it runs at like 5 fps (estimated, I havn't actually counted).
I KNOW this is a graphics thing, because I can make it run quite smoothly by commenting out the code to draw the background/paralax backgrounds... and that code is nothing more complicated than a graphics2d.drawImage
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import javax.swing.JApplet;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.event.*;
import Entities.*;
import Worlds.*;
// run this applet in 640x480
public class Orkz extends JApplet implements Runnable, KeyListener
     double x_pos = 10;
     double y_pos = 400;
     int xRes=640;
     int yRes=480;
     boolean up_held;
     boolean down_held;
     boolean left_held;
     boolean right_held;
     boolean jump_held;
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     World world;
     BufferedImage buffer;
     Graphics2D bufferG2D;
     int radius = 20;
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          //xRes=(int) this.getSize().getWidth();
          //yRes=(int) this.getSize().getHeight();
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        bufferG2D=buffer.createGraphics();
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     public void keyPressed(KeyEvent e)
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     }//end public void keypressed
     public void keyReleased(KeyEvent e)
          //this works fine
     public void keyTyped(KeyEvent e)
     public void paint( Graphics g )
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          long tm2;
          long tm3;
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     public void destroy() { }
}Here's the code for the first level
package Worlds;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.*;
import javax.swing.*;
import javax.imageio.*;
import java.awt.event.*;
import java.awt.*;
import java.awt.image.*;
import java.io.File;
import java.net.URL;
import java.awt.geom.AffineTransform;
import Entities.Player;
public class WorldOne implements World
     Player player;
     //Location of Applet
     URL codeBase;
     // Image Resources
     BufferedImage paralax1Image;
     BufferedImage paralax2Image;
     BufferedImage backgroundImage;
     // Graphics Elements
     int xRes;
     int yRes;
     double paralaxScale1,paralaxScale2;
     double worldSize;
     int frameX=1;
     int frameY=1;
     public WorldOne(Player player, URL codeBase, int xRes, int yRes)
          this.player=player;
          this.codeBase=codeBase;
          this.xRes=xRes;
          this.yRes=yRes;
          worldSize=4000;
        String backgroundImagePath="worlds\\world1Graphics\\WorldOneBack.png";
        String paralax1ImagePath="worlds\\world1Graphics\\WorldOnePara1.png";
        String paralax2ImagePath="worlds\\world1Graphics\\WorldOnePara2.png";
        try
        URL url1 = new URL(codeBase, backgroundImagePath);
         URL url2 = new URL(codeBase, paralax1ImagePath);
         URL url3 = new URL(codeBase, paralax2ImagePath);
        backgroundImage = ImageIO.read(url1);
        paralax1Image = ImageIO.read(url2);
        paralax2Image = ImageIO.read(url3);
        paralaxScale1=(paralax1Image.getWidth()-xRes)/worldSize;
        paralaxScale2=(paralax2Image.getWidth()-xRes)/worldSize;
        catch (Exception e)
             System.out.println("Failed to load Background Images in Scene");
             System.out.println("Background Image Path:"+backgroundImagePath);
             System.out.println("Background Image Path:"+paralax1ImagePath);
             System.out.println("Background Image Path:"+paralax2ImagePath);
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          double xPos=player.getXPos();
          return worldSize;
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          this.frameX=frameX;
          this.frameY=frameY;
     public int getFrameXPos()
          return frameX;
     public int getFrameYPos()
          return frameY;
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          int scaledFrame=(int)(paralaxScale1*frameX);
          renderSpace.drawImage(paralax1Image,-scaledFrame,0,null); //Comment this to increase performance Massively
     public void paralax2Render(Graphics2D renderSpace)
          int scaledFrame=(int)(paralaxScale2*frameX);
          renderSpace.drawImage(paralax2Image,-scaledFrame,0,null); //Comment this to increase performance Massively
     public void backgroundRender(Graphics2D renderSpace)
          renderSpace.drawImage(backgroundImage,null,null); //Comment this to increase performance Massively
     public void entityRender(Graphics2D renderSpace)
          //System.out.println(frameX);
          double xPos=player.getXPos()-frameX+xRes/2;
         double yPos=player.getYPos();
         int radius=15;
         renderSpace.setColor (Color.blue);
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         renderSpace.fillOval ((int)xPos - radius, (int)yPos - radius, 2 * radius, 2 * radius);
          renderSpace.setColor(Color.blue);
     public void particleRender(Graphics2D renderSpace)
          //NYI
     public void render(Graphics2D renderSpace)
          backgroundRender(renderSpace);
          paralax2Render(renderSpace);
          entityRender(renderSpace);
          paralax1Render(renderSpace);
}//end class WorldOneI can post more of the code if people need clarification. And to emphasize, if I take off the calls to display the background images (the 3 lines where you do this are noted), it works just fine, so this is purely a graphical slowdown, not anything else.
Edited by: CthulhuChild on Oct 27, 2008 10:04 PM

are the parallax images translucent by any chance? The most efficient way to draw images with transparent areas is to do something like this:
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This piece of code does a number of things:
- it allows the images to be hardware accelerated
- the returned image is 100% compatible with the display, regardless of what the input image is
- BITMASK transparent images are an incredible amount faster than translucent images
BITMASK means that a pixel is either fully transparent or it is fully opaque; there is no alpha blending being performed. Alpha blending in software rendering mode is very slow, so this may be the bottleneck that is bothering you.
If you require your parallax images to be translucent then I wouldn't know how to get it to draw quicker in an applet, other than trying out java 6 update 10 to see if it fixes things.

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Boilerplate text:
Reset Preferences
http://forums.adobe.com/thread/375776
1) Close the program and press Ctrl+Alt+Shift/Cmd+Option+Shift during startup (not reversible)
or
2) Move the Folder. See:
http://www.bugge.com/Family-and-friends/Illy/illy.html
--OB

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Hey, i'm making a spaceship game, and i use buffered .gif that are loaded before they are used.
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Message was edited by:
MatthewH

I've found that a lot of game development seems to involve working out exactly what you can get away with in terms of display rather than conforming to a strict model. Sure, this is changing these days, but in terms of a bitmapped sprite just how much difference will each incremement make when projected onto pixels?
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Please answer first whether the column is stored in a separate lobsegment.
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The message above should be:
OMG, me dumb you smart Florian...
Thank you for your suggestion... It's not the best OR anything close to what I thought it would be, it's certainly one way to do it and better then what I've got now...
Thanks again Florian, I really appreciate it!!
BTW, is there anything that would produce the sound faster then this?
Message was edited by:
BuggyVB

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How to improve Performance of the Statements.

Hi,
I am using Oracle 10g. My problem is when i am Execute & fetch the records from the database it is taking so much time. I have created Statistics also but no use. Now what i have to do to improve the Performance of the SELECT, INSERT, UPDATE, DELETE Statements.
Is it make any differents because i am using WindowsXP, 1 GB RAM in Server Machine, and WindowsXP, 512 GB RAM in Client Machine.
Pls. Give me advice for me to improve Performance.
Thank u...!

What and where to change parameters and values ?Well, maybe my previous post was not clear enough, but if you want to keep your job, you shouldn't change anything else on init parameter and you shouldn't fall in the Compulsive Tuning Disorder.
Everyone who advise you to change some parameters to some value without any more info shouldn't be listen.
Nicolas.

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