Thread: Sprite class add-on: Sprite GetSubImage

Basically, if you have ever used a BufferedImage you will notice that it's possible to use this method;

getSubimage(int x, int y, int w, int h)
Returns a subimage defined by a specified rectangular region.

So i decided to make one for the sprite class.

Here it is;

Code:

public Sprite getSubImage(Sprite sprite, int sX, int sY, int w, int h)
    {
	try {
		int[] pixels = new int[w * h];
		int pixOn = 0;
		for (int i = sX; i < w; i++)
		{
			for (int i1 = sY; i1 < h; i1++)
			{
				int i2 = i - sX;
				int i3 = i1 - sY;
				pixels[i2 + i3 * w] = sprite.myPixels[i + i1 * sprite.myWidth];
			}
		}		
		sprite.myHeight = h - sY;
		sprite.myWidth = w - sX;
		sprite.myPixels = pixels;
		return sprite;
	} catch(Exception e) {
		e.printStackTrace();
	}
	return null;
    }

Basically the usage is;

Code:

mySprite = mySprite.getSubImage(mySprite, startX, startY, pixelWidth, pixelHeight);

You could also do;

Code:

Sprite newSprite = mySprite.getSubImage(mySprite, startX, startY, pixelWidth, pixelHeight);

Which would create a new sprite from the previous one.

Here is an example of using it for the hitpoints bar;

Code:

	

	if(((Entity) (obj)).loopCycleStatus > loopCycle)
        {
		try {
                	npcScreenPos(((Entity) (obj)), ((Entity) (obj)).height + 15);
                	if(spriteDrawX > -1)
                	{
                    		int i1 = (((Entity) (obj)).currentHealth * 30) / ((Entity) (obj)).maxHealth;
                    		if(i1 > 30)
                        		i1 = 30;
                    		Sprite emptyBar = new Sprite("empty.png");
				Sprite fullBar = new Sprite("full.png");
				fullBar.drawSprite(spriteDrawX - 15, spriteDrawY - 3);
				emptyBar = emptyBar.getSubImage(emptyBar, 0, 0, (30 - i1), emptyBar.myHeight);
				emptyBar.drawSprite(spriteDrawX - 15, spriteDrawY - 3);
                    	}
                } catch(Exception e) {
			e.printStackTrace();
		}
	}

Using these 2 sprites;

FULL:


EMPTY:


I get this output;



But the images don't have to be simple, you could do this for loading bar's etc aswell.

Have fun.

It also works with transparency from method drawSprite1.