CODEWITHSUNDEEP
javajava-2d
Daan van Yperen
Daan van Yperen

Reputation: 684

tinting sprites in Java2D on the fly?

I am creating a game with an ascii-like map using Java2D on Linux (like a roguelike).

By rendering BufferedImages via Graphics2D.drawImage the terrain is rendered. I would like to change the hue of each drawn image on the fly, without hurting performance too much. How can I achieve this?

I suspect setComposite is part of the puzzle. Currently I do not need to keep the background intact (so transparency is not an issue). I want to use a wide variety of colors, so pre-generating tinted sprites is not a solution for me.

Upvotes: 2

Views: 1231

Answers (3)

Daan van Yperen
Daan van Yperen

Reputation: 684

I decided to switch to a framework that allowed more control given Tom Hawtin's answer. JOGL and LWJGL both seem to provide access to a tinting mechanic. I opted for LWJGL, as it overlaps more with my other needs.

I found this Space Invaders Tutorial useful as its a nice rosetta stone between Java2D and JOGL, LWJGL.

Here is the method I created for the LWJGL Sprite class.

public void drawTinted(int x, int y, float red, float green, float blue) 
{
    GL11.glPushMatrix();

    texture.bind();

    GL11.glTranslatef(x, y, 0);     
    GL11.glColor3f(red,green,blue);

    GL11.glBegin(GL11.GL_QUADS);
    {
      GL11.glTexCoord2f(0, 0);
      GL11.glVertex2f(0, 0);
      GL11.glTexCoord2f(0, texture.getHeight());
      GL11.glVertex2f(0, height);
      GL11.glTexCoord2f(texture.getWidth(), texture.getHeight());
      GL11.glVertex2f(width,height);
      GL11.glTexCoord2f(texture.getWidth(), 0);
      GL11.glVertex2f(width,0);
    }
    GL11.glEnd();

    GL11.glPopMatrix();
}

Upvotes: 0

Tom Hawtin - tackline
Tom Hawtin - tackline

Reputation: 147164

For high performance you might want to use JOGL. It gives you good access to hardware acceleration, even if you do not need to 3D features.

Upvotes: 1

Paul Wicks
Paul Wicks

Reputation: 65550

I asked a similar question a while ago and got a pretty good answer here, although I was doing all of the tinting ahead of time. In any case, you'll probably want to look at BufferedImageOp. Also, the JH Labs site has a ton of useful info on doing image processing in java.

Upvotes: 2

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