Sprite Animations about pursuedpybear HOT 4 CLOSED

Here are suggestions for making this a natural step after static sprites. Maybe these are separate issues later?

1. If you already have a sprite.png adding number postfixed images in the same location (sprite-2.png, etc.) will create an animation automatically, at the base FPS
2. If the numbers are consecutive (1, 2, 3, 4...) the animation frames run at a consistent rate. If a frame number is skipped, it indicates a pause (1, 2, 10, 11)
3. Sprite classes have an optional "Sprite FPS" attribute that customizes the frame rate of the animation associated with that sprite. For example, if the game is running at 60 FPS and the Sprite FPS is 12, each image holds for 5 game frames. Maybe there could be a game-wide default you can adjust? Dunno.

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I wrote an AnimationSprite in mutant games, although this is more like a particle effect.

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OpenGL uses texture coordinates to map multiple textures to a single image file. The top left of the image is index 0,0 and the bottom right is 1,1. If you have a sprite sheet like this: fire animation sprite-sheet the texture coordinates for the first frame in the animation are [(0,0), (0,0.125), (0.125, 0.125), (0.125, 0)] note: the coordinates are counterclockwise this is explained in this link why-should-i-create-vertices-counter-clockwise-and-not-clockwise as allowing back face culling to be used. In the example sprite-sheet the frames are in a 2d left-to-right array this configuration and the alternative top-down listing of frames are special cases that deserve to be programmed as presets for an animated-sprite-sheet class.

For implementing sprite animations; I recommend creating a dataclass that holds the texture coordinates, and frame number; then using a generator class to represent the animation how-to-write-a-generator-class
def animation-generator(sprite-sheet, frame-number): //check if frame exists as an entry into the dictionary of frames if not dictionary-of-computed-frames[frame-number]: list-of-computed-frames[] = (compute-texture-coordinate-using-callback-function) return dictionary-of-computed-frames[frame-number]

explanation of texture coordinates for uv mapping on stackoverflow: how do opengl texture coordinates work

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Implemented in #230.

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