Smoovement.lua

Smoovement is an API that introduces sprite objects and ways to transform them as well as parent-children relationships.

Installation

Just download this and extract it. Then, copy the file into your level's graphics folder.

Setup

To enable the smoovement library for a specific level, add this line to lunadll.lua:

local smoovement = API.load ("smoovement");

This will load the smoovement API.

Documentation

Values

These are variables you can access.

world	sprite	The sprite object used for referencing everything. Any transformations applied to this sprite will get applied to every sprite.
customDraw	boolean	If this is set to true, sprites will not be drawn in smoovement.lua but can instead be drawn at will through smoovement.draw().
customTick	boolean	If this is set to true, there won't be any calculations in smoovement.lua but they can be called through smoovement.tick().

Sprite

Values

Sprite.img	The LuaImageResource that the sprite is currently displaying.
Sprite.x	The x translation relative to its parent.
Sprite.y	The y translation relative to its parent.
Sprite.rotation	The current rotation of the sprite relative to its parent in degrees.
Sprite.pivotX	The x coordinate of the pivot point, the point that's used as the center for scaling and rotation, where 0 represents the leftmost side of the sprite and 1 the rightmost.
Sprite.pivotY	The y coordinate of the pivot point, the point that's used as the center for scaling and rotation, where 0 represents the top of the sprite and 1 the bottom.
Sprite.scaleX	The value by which the sprite is scaled horizontally.
Sprite.scaleX	The value by which the sprite is scaled vertically.
Sprite.visible	boolean containing whether the sprite is visible.
Sprite.usesSceneCoords	boolean containing whether the will be drawn to the scene instead of to the screen. False by default.
Sprite.hasParent	boolean containing whether the sprite has a parent. Don't edit this manually.
Sprite.parent	Parent sprite. Don't edit this manually.
Sprite.children	table of children. Don't edit this manually.
Sprite.hasAnimation	boolean containing whether the sprite is animated.
Sprite.dTime	Number of frames between animations.
Sprite.counter	A counter that increases from 0 to Sprite.dTime - 1 and is used to keep track of animation.
Sprite.frame	The index of the frame that the sprite is currently on.
Sprite.frames	table of LuaImageResource, with each one representing one frame of animation.
Sprite.priority	Priority with which the sprite is drawn. See LunaLua Render Priority.
Sprite.transform	The transform of the sprite; only used for rendering.
Sprite.deleted	boolean containing whether the sprite, as well as its children, are to be deleted on the next frame.

Functions

Sprite:moveTo		x	y
Moves the sprite to the specified coordinates.	nil	number The new x coordinate.	number The new y coordinate.
Sprite:setPivot		x	y
Sets the pivot point to the specified coordinates.	nil	number The new x coordinate of the pivot point.	number The new y coordinate of the pivot point.
Sprite:setScale		x	y
Sets the scale of the sprite.	nil	number The new x scale.	number The new y scale.
Sprite:setParent		sprite
Sets a new parent sprite.	nil	sprite The parent sprite.
Sprite:removeParent
Removes the parent sprite.	nil
Sprite:setAnimation		frames	dTime
Sets the sprite's animation.	nil	table of LuaImageResource The animation frames.	number The amount of frames between frames of animation.
Sprite:setSprite		sprite
Sets the image of the sprite.	nil	LuaImageResource The new sprite.

External Use Functions

These are functions you will need to use the library.

createSprite		properties
Creates a Sprite object.	Sprite	table The properties of the sprite.
draw
Executes the drawing operations.	nil
tick
Executes the calculating operations.	nil
translateM		x	y
Creates a transformation matrix from the x and y coordinates.	matrix3	number The x coordinate.	number The y coordinate.
rotateM		sin	cos
Creates a rotation matrix from the sin and cosine of an angle.	matrix3	number The sin.	number The cosine.
scaleM		x	y
Creates a scaling matrix from the amount of stretching of the x and y axis.	matrix3	number How much the x-axis is stretched.	number How much the y-axis is stretched.
vectorTransToXY		vector	trans
Takes a vector2 and a transformation matrix and outputs the new x and y coordinates.	number, number	vector2 The vector2 to transform.	matrix3 The transformation matrix.