Visible to current unit

Newbie & Debugging Questions
#1

Hi, I got a game with a grid map, One Grid is 30-30 and is filled with images.

I loop trough the array and see what sort it is and then draw the images to the buffer.

Now I’m adding units and they all need tiles turned lighter when they can see them.

Do i need to create extra images for light and dark? or can an image be turned darker manualy with code?

Alsoo all the units combined have a terretory that is lighten up do i need some sort of frames to do that?

so i can quickly change view when it is the next player his turn?

or just different buffers.

#2 
public void drawBrighterImage(Graphics2D g2d, BufferedImage im, 
                                      int x, int y, float brightness)
  /* Draw the image with changed brightness, by using a RescaleOp. 
     Any alpha channel is unaffected. */
  { 
    if (im == null) {
      System.out.println("drawBrighterImage: input image is null");
      return;
    }

    if (brightness < 0.0f) {
      System.out.println("Brightness must be >= 0.0f; setting to 0.5f");
      brightness = 0.5f;
    }
    // brightness may be less than 1.0 to make the image dimmer

    RescaleOp brigherOp;
    if (hasAlpha(im)) {
       float[] scaleFactors = {brightness, brightness, brightness, 1.0f}; 
                // don't change alpha
                // without the 1.0f the RescaleOp fails, which is a bug (?)
       float[] offsets = {0.0f, 0.0f, 0.0f, 0.0f};
       brigherOp = new RescaleOp(scaleFactors, offsets, null);
    }
    else   // not transparent
      brigherOp = new RescaleOp(brightness, 0, null);

    g2d.drawImage(im, brigherOp, x, y);
  }  // end of drawBrighterImage()


  public void drawNegatedImage(Graphics2D g2d, BufferedImage im, int x, int y)
  /* Draw the image with 255-<colour value> applied to its RGB components. 
     Any alpha channel is unaffected. */
  { 
    if (im == null) {
      System.out.println("drawNegatedImage: input image is null");
      return;
    }

    if (hasAlpha(im))
      g2d.drawImage(im, negOpTrans, x, y);  // use predefined RescaleOp
    else
      g2d.drawImage(im, negOp, x, y);
  }

public void drawFadedImage(Graphics2D g2d, BufferedImage im, 
                                   int x, int y, float alpha)
  /* The degree of fading is specified with the alpha value.
     alpha == 1 means fully visible, 0 mean invisible. */
  {
    if (im == null) {
      System.out.println("drawFadedImage: input image is null");
      return;
    }

    if (alpha < 0.0f) {
      System.out.println("Alpha must be >= 0.0f; setting to 0.0f");
      alpha = 0.0f;
    }
    else if (alpha > 1.0f) {
      System.out.println("Alpha must be <= 1.0f; setting to 1.0f");
      alpha = 1.0f;
    }

    Composite c = g2d.getComposite();  // backup the old composite 

    g2d.setComposite( AlphaComposite.getInstance(
                           AlphaComposite.SRC_OVER, alpha)); 
    g2d.drawImage(im, x, y, null);

    g2d.setComposite(c);
      // restore the old composite so it doesn't mess up future rendering 
  }
#3

wow, your fast :slight_smile: i’ll try that code.

And what about the units, I need differt players each represented by the same image(ie infantery, tanks,…) but different color.

and what base color should is choose then.

#4

I think your better off just re coloring the sprites, thats what I do. Otherwise you would have to make a color that you go through and replace, which means you couldn’t have that color on the sprite. If there is another way to do it I don’t know it. I bet there is though.