Moai - Learn Lua for iOS Game Development - page 207

Animating Text
The MOAITextBox has a spool function, which allows for the text to be revealed character by
character. This provides for some interesting effects when displaying text.

textbox:spool()

Drawing Vector Primitives
Moai uses the class MOAIDeck to create a canvas on which drawing operations can be performed. All
drawing is performed in the local space of the deck.

MOAIScriptDeck type, as follows:

scriptDeck object relies on a callback function to manage the drawing of the scriptDeck , which
setDrawCallback function. The callback has the parameters index , xOffset ,
, xScale , and yScale . The index determines the deck that needs to be redrawn, and the

The MOAI drawing classes allow for drawing all of the following:

 Lines

 Rectangles

 Filled rectangles

 Circles

 Filled circles

 Ellipses

 Filled ellipses

 Polygons

 Points

 Drawing attributes

Drawing Lines
A single line can be drawn using the drawRay function, the syntax for which is
MOAIDraw.drawRay(x, y, dx, dy) . The x and y are the absolute coordinates, and the
dx and dy are the directions of the line extending from the x and y coordinates.