Can't draw a square

QuasarCreator

I am trying to make a square and I am getting this error:

level1.lua:16: bad argument #1 to 'setAsBox' (b2PolygonShape expected, got number)
stack traceback:

Here is my code:

local square = b2.PolygonShape.setAsBox(20, 20, 0, 0, 0) square:setFillStyle(Shape.NONE) square:setLineStyle(1, 0x000FF, 2) self:addChild(square)

So why am I getting this error? I can't seem to find anything I did wrong.

-Thankyou in advance!!

talis

Did you include box2d in your lua code.?
require "box2d"

Teranth

Well, you seem to be trying to draw a square but using the Box2D physics object.

In example:

-- Include Box2D require "box2d"   -- Create a Box2D shape for physics use--does not display unless you -- use debugdraw or atatch a sprite. local square_b2d = b2.PolygonShape.new() square_b2d:setAsBox(20, 20, 0, 0, 0)

Or if you actually want to draw just a box on the screen you could do this.

-- Create a new shape drawing. local square_shape = Shape.new() square_shape:setFillStyle(Shape.NONE) square_shape:setLineStyle(1, 0x000FF, 2)   -- Define a square with side length of 100 square_shape:beginPath() square_shape:lineTo(0, 100) square_shape:lineTo(100, 100) square_shape:lineTo(100, 0) square_shape:lineTo(0, 0) square_shape:endPath()   -- Add the square drawing to the scene. stage:addChild(square_shape)

I may be misunderstanding, but to create a physics shape you would do the first example--and attach a sprite to it so you can detect collisions and use gravity and the good stuff.

The second example just draws a square on the screen, and returns a sprite you can scale, rotate, and such.

Hope it helps

Eli

QuasarCreator

@Teranth - I did include require "box2d" but I wanted just a plain box so I went with your second example. Thankyou very much!

Teranth

@QuasarCreator Anytime, this forum is very helpful feel free to ask anything you get stuck on Glad I was able to help you out.