ALFA

A domain specific language for animations

Types

int

Represents an integer accordingly to the JavaScript definition.

rect

Represents a rectangle.

bool

Represents truthy or falsy values.

Built-in functions

move(rect x, int offsetX, int offsetY, int duration)

Moves a rectangle from its current position to a new position based on offsetX, and offsetY over a duration in miliseconds.

Parameters	Description
rect x	A declared variable of type rect
int offsetX	A declared variable of type int
int offsetY	A declared variable of type int
int duration	A declared variable of type int that must be positive

wait(int duration)

Repeats the last played frame over a duration in miliseconds.

Parameters	Description
int duration	A declared variable of type int that must be positive

createRect(int xPosition, int yPosition, int width, int length)

Creates a rectangle at (x, y) on the canvas with a given width and length.

Parameters	Description
int xPosition	A declared variable of type int
int yPosition	A declared variable of type int
int width	A declared variable of type int
int length	A declared variable of type int

Keywords

paral { }

Used to play animations in parallel. Currently, only the move built-in function is allowed to be executed within a paral statement. Note, only allows the same property in a single paral to be changed once.

loop (int i from 1 .. 2) { }

Allows animations to be played a number of times. The loop above is executed twice, where i is first assigned to 1, then 2.

if(bool condition1)-else if(bool condition2)-else

The typical if statement.

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