Walt

An animation library for LÖVE.

Table of Contents

• Usage
• Name
• Functions
  • animator.merge
  • animator.newAnimation
    • anim:draw
    • anim:getActive
    • anim:getCurrentFrame
    • anim:getDimensions
    • anim:getHeight
    • anim:getLooping
    • anim:getOnAnimationChange
    • anim:getOnAnimationEnd
    • anim:getOnLoop
    • anim:getPauseAtEnd
    • anim:getPaused
    • anim:getWidth
    • anim:pause
    • anim:pauseAtEnd
    • anim:restart
    • anim:resume
    • anim:setActive
    • anim:setCurrentFrame
    • anim:setLooping
    • anim:setOnAnimationChange
    • anim:setOnAnimationEnd
    • anim:setOnLoop
    • anim:setPauseAtEnd
    • anim:setPaused
    • anim:togglePause
    • anim:toggleActive
    • anim:toggleLooping
    • anim:togglePauseAtEnd
    • anim:update
    • Aliases
  • animator.newGrid
    • grid:getFrames
• Examples

Usage

local animator = require 'path.to.walt'

function love.load()
	local image = love.graphics.newImage( 'Path/to/image.png' )
	anim = animator.newAnimation( { image }, 1 )
end

function love.update( dt )
	anim:update( dt )
end

function love.draw()
	anim:draw()
end

And that's it!

Name

• Walt is named for famous animator Walt Disney.

Functions

animator.merge

• Combine several tables into one compact table.
• Synopsis:
  • frames = animator.merge( ... )
• Arguments:
  • ...: Tables. A list of images and quads in the order of the animation.
• Returns:
  • frames: Table. A flattened list of the quads and images.
• Notes:
  • Works well in combination with animator.newAnimation.

animator.newAnimation

• Creates a new animation object.
• Synopsis:
  • anim = animator.newAnimation( frames, duration, [quadImage] )
  • anim = animator.newAnimation( frames, durations, [quadImage] )
• Arguments:
  • frames: Table. A flat table of images and quads in the order that they will be played.
  • duration: Number. The amount of time each animation will be played.
  • durations: Table. There are several formats to this table. Each must have the same number of entries as frames. You can combine these in any way. See below table for more.
  • quadImage: Image. The image that the quads for the animation will be using. Not needed if you aren't using any quads.

Format	Example	Description
Flat	{ .1, .2, .1, .5 }	A numbered list, representing the corresponding frame. In this case, makes frame 1 have a duration of .1, 2 a duration of .2, etc.
List	{ ['1 - 5'] = 1 }	A table key, listing the frame numbers, in the style of lower - larger. Can have 0-unlimited spaces between the -. In this case, frames 1 through 5 each have a duration of 1 second
Key	{ ['1, 3, 5'] = 1 }	Frame numbers are seperated by ,. Can have 0-unlimited spaces after the ,. In this case, frames 1, 3, and 5 have a duration of 1 second.

• Returns:
  • anim: Table. Animation object that can be used. For more, see the anim: sub-functions.
• Notes:
  • The quads should all be from the same image.
  • After all of the Keys and Lists are inserted, the unassigned keys are done in the order of the flat entries.
    • { ['1 - 3'] = .5, ['6 - 10'] = 1, .2, .3, .4 } = { .5, .5, .5, .2, .3, 1, 1, 1, 1, 1, .4 }

anim:draw

• Draw the animation.
• Synopsis:
  • anim:draw()
• Arguments:
• Returns:
  • Nothing.
• Notes:
  • You have to call [anim:update](#animupdate) as well.

anim:getActive

• Returns if the animation is currently playing.
• Synopsis:
  • active = anim:getActive()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • active: Boolean. Whether the animation is playing or not.

anim:getCurrentFrame

• Gets the current frame number.
• Synopsis:
  • frame = anim:getCurrentFrame()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • frame: Number. The number frame that the animation is on.

anim:getDimensions

• Gets the width and height of the current frame of the animation.
• Synopsis:
  • width, height = anim:getDimensions()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • width: Number. The width of the current frame.
  • height: Number. THe height of the current frame.

anim:getHeight

• Gets the height of the current frame of the animation.
• Synopsis:
  • height = anim:getHeight()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • height: Number. The height of the current frame.

anim:getLooping

• Gets whether the animation is a looping animation or not.
• Synopsis:
  • isLooping = anim:getLooping()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • isLooping: Boolean. Whether the animation is looping or not.

anim:getOnAnimationChange

• Gets the function called on frame-change.
• Synopsis:
  • func = anim:getOnAnimationChange()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • func: Function. The function called on frame-change.

anim:getOnAnimationEnd

• Gets the function called on animation end.
• Synopsis:
  • func = anim:getOnAnimationEnd()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • func: Function. The function called on animation end.

anim:getOnLoop

• Gets the function called on-loop.
• Synopsis:
  • func = anim:getOnLoop()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • func: Function. The function called on-loop.

anim:getPauseAtEnd

• Gets whether the animation should pause on the last frame.
• Synopsis:
  • shouldPause = anim:getPauseAtEnd()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • shouldPause: Boolean. Whether the animation will pause at the end or not.

anim:getPaused

• Gets whether the animation is paused or not.
• Synopsis:
  • isPaused = anim:getPaused()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • isPaused: Boolean. Whether the animation is paused or not.

anim:getWidth

• Gets the width of the current frame of the animation.
• Synopsis:
  • width = anim:getWidth()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • width: Number. The width of the frame.

anim:pause

• Pauses the animation.
• Synopsis:
  • anim:pause()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • Nothing.

anim:pauseAtEnd

• Sets the function to pause after the last frame has played.
• Synopsis:
  • anim:pauseAtEnd()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • Nothing.

anim:restart

• Resets the animation to the first frame.
• Synopsis:
  • anim:restart()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • Nothing.

anim:resume

• Resumes the animation from a pause.
• Synopsis:
  • anim:resume()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • Nothing.

anim:setActive

• Stops or resumes the animation.
• Synopsis:
  • anim:setActive( active )
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
  • active: Boolean. Whether the animation should be playing (true) or not (false).
• Returns:
  • Nothing.

anim:setCurrentFrame

• Sets the current frame of the animation.
• Synopsis:
  • anim:setCurrentFrame( frame )
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
  • frame: Number. The frame to be set.
• Returns:
  • Nothing.

anim:setLooping

• Sets whether the animation should loop at the end or not.
• Synopsis:
  • anim:setLooping( loop )
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
  • loop: Boolean. Whether the animation should loop at the end or not.
• Returns:
  • Nothing.

anim:setOnAnimationChange

• Sets the function executed on animation change.
• Synopsis:
  • anim:setOnAnimationChange( func )
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
  • func: Function. The function to be called on each animation increment.
• Returns:
  • Nothing

anim:setOnAnimationEnd

• Sets the function executed on animation end.
• Synopsis:
  • anim:setOnAnimationEnd( func )
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
  • func: Function. The function to be called on each animation end.
• Returns:
  • Nothing

anim:setOnLoop

• Sets the function executed on loop.
• Synopsis:
  • anim:setOnLoop( func )
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
  • func: Function. The function to be called on each loop.
• Returns:
  • Nothing.

anim:setPauseAtEnd

• Sets the animation to pause after displaying the final frame.
• Synopsis:
  • anim:setPauseAtEnd( shouldPause )
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
  • shouldPause: Boolean. Whether or not the function should pause after displaying the final frame.
• Returns:
  • Nothing.

anim:setPaused

• Sets if the animation is paused or not.
• Synopsis:
  • anim:setPaused( isPaused )
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
  • isPaused: Boolean. Whether the animation should be paused or not.
• Returns:
  • Nothing.

anim:togglePause

• Toggles the pause of the animation.
• Synopsis:
  • anim:togglePause()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • Nothing.

anim:toggleActive

• Toggles whether the animation is active or not.
• Synopsis:
  • anim:toggleActive()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • Nothing.

anim:toggleLooping

• Toggles whether the animation is looping or not.
• Synopsis:
  • anim:toggleLooping()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • Nothing.

anim:togglePauseAtEnd

• Toggles whether the animation pauses after playing the last frame.
• Synopsis:
  • anim:togglePauseAtEnd()
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
• Returns:
  • Nothing.

anim:update

• Update the animation.
• Synopsis:
  • anim:update( dt )
• Arguments:
  • anim: Table. An animation object returned from animator.newAnimation.
  • dt: Number. The time between each update-frame.
• Returns:
  • Nothing.

animator.newGrid

• Creates a new grid to make animation easier.
• Synopsis:
  • grid = animator.newGrid( frameWidth, frameHeight, image, [startX, startY, stopX, stopY] )
• Arguments:
  • frameWidth: Number. The width each quad will be.
  • frameHeight: Number. The height each frame will be.
  • image: Image. The image that will be used.
  • startX: Number. The x position to start creating the grid. Defaults as 0.
  • startY: Number. The y position to start creating the grid. Defaults as 0.
  • stopX: Number. The x position to stop creating the grid. Defauls as the image's width.
  • stopY: Number. The y position to stop creating the grid. Defaults as the image's height.
• Returns:
  • grid: Table. A table of quads.

grid:getFrames

• Returns the quads in the specified order you create it.

• Synopsis:

  • frames = grid:getFrames()

• Arguments:

  • grid: Table. A grid object retured by animator:newGrid. See the picture below to get a better idea of how they work.

• Returns:

  • frames: Table. A table containing the quads created from the grid.

• Each pair of numbers is a pair of x and y coordinates, referring to the grid.

  • Use plain numbers to refer to single simple x and y coordinates.
  • Use a string with numbers seperated by a hyphen (-) to represent "through".
  • In a pairs, both arguments can't be strings.

• So you would make a grid like this (assuming the image is called 'grid.png'):

local image = love.graphics.newImage( 'grid.png' )
local grid = animator.newGrid( 32, 32, image, 32, 32, 288, 224 )
local anim = animator.newAnimation( grid.getFrames( 1,1  2,1  3,1  '4 - 7',1,  8, '1 - 6' ), 1, image )
-- You have to remember to pass the image that the quads are from.

Alisases

• There functions are also available, and work just like their conterpart.

Alias	Corresponding Function
anim:isActive	anim:getActive
anim:isLooping	anim:getLooping
anim:isPaused	anim:getPaused
anim:getFrame	anim:getGetCurrentFrame
anim:gotoFrame	anim:setCurrentFrame
anim:setAnimationChange	anim:setOnAnimationChange
anim:setAnimationEnd	anim:setOnAnimationEnd
anim:setFrame	anim:setCurrentFrame
grid:__call	grid:getFrames

Examples

See Examples.