Sprite sheet in LWJGL

[masteryoom]

How would you select different pictures in a sprite sheet to put on the screen with LWJGL?

[Grunnt]

Your question is a bit generic: do you have code examples of what you are trying to do?

You may consider using Slick2D or LibGDX, which both support easy-to-use sprite sheets out of the box.

[Varkas]

Maybe I misunderstood the question, but isn't that just done by setting the texture coordinates so that the right area from the sprite sheet is put as texture on the sprite?

Games published by our own members! Check 'em out!

[matheus23]

So ... actually it's pretty easy.

You've got a SpriteSheet, which has dimensions width and height (in pixels).
Usually for Texture coordinates you use these:
1st Vertex: x: 0; y: 0
1st Vertex: x: 1; y: 0
1st Vertex: x: 1; y: 1
1st Vertex: x: 0; y: 1

We could replace this by some variables: lowX, lowY, highX and highY:
1st Vertex: x: lowX; y: lowY
1st Vertex: x: highX; y: lowY
1st Vertex: x: highX; y: highY
1st Vertex: x: lowX; y: highY

To get the above example, we would use 1 for high and 0 for low.

Sooo, to draw "Sprites" from the SpriteSheet, you'd just change your high and low values.
If you've got a spritesheet which is 512 pixels of width and 512 pixels of height, and you want the Sprite in the SpriteSheet at position x: 32; y: 32 and width: 64; height: 64, then you'd easily use this:

1   2   3   4

sprite.lowX = sprite.pixelX / sheet.width; sprite.lowY = sprite.pixelY / sheet.height; sprite.highX = sprite.lowX + (sprite.pixelWidth / sheet.width); sprite.highY = sprite.lowY + (sprite.pixelHeight / sheet.height);

It's pretty easy actually.