Polygons, Box2D and tiled

Tom2012 · October 2012

Playing with the example ball and gideros Tiled download, I can't get polygons to work as objects.

Has anyone done this yet?

Thanks

Tom2012 · October 2012

Example enclosed - when I export the lua file and run it, the ball falls through the shape.

hgvyas123 · November 2012

[edit : sorry this example is also not working with polygons only rects]

hi take a look at the example from @evs

http://www.giderosmobile.com/forum/discussion/699/using-tiled#Item_21

basically you need to create boxbody from the object layer so your ball will not fall down

hope it helps

hgvyas123 · November 2012

ok, all of the polygons you create will have one table attached with them named polygon

so you can easily chk whether it is normal object or polygon by

if layer.objects[i].polygon == nil then
 
else
--your polygon code here
end

and here's the code for how to draw the shape from polygon from the tiled map

                local myShape = Shape.new()
		myShape:setFillStyle(Shape.SOLID, 0xff0000, 0.5)
		myShape:beginPath()
		myShape:moveTo(0,0)
		for j=1,#layer.objects[i].polygon do
 
			myShape:lineTo(layer.objects[i].polygon[j].x,layer.objects[i].polygon[j].y)
		end
 
		myShape:closePath()
		myShape:endPath()
		myShape:setPosition(layer.objects[i].x,layer.objects[i].y)
 
		myShape:setColorTransform(1,1,1,1)
 
 
		stage:addChild(myShape)

hgvyas123 · November 2012

and to add physics to your shape take a look at

http://giderosmobile.com/forum/discussion/642/example-w-box2d-and-mark-bayazit039s-polygon-decomposition-algorithm

Tom2012 · November 2012

Wow hgvyas123

That's exactly what I need for my next app.

Can't thank you enough my friend!

hgvyas123 · November 2012

no need of thnx i will also need this for my next game

Tom2012 · November 2012

For anyone else wondering this in the future, here is a modified version of the Tiled demo that works with any polygons created in Tiled.

A bit rough but shows the code that might prove helpful

Tom2012 · November 2012

Some other notes:

- Polygons must be between 3 and 8 points to work
- You have to draw the shape in Tiled clockwise or you'll get errors.
- Shapes must be convex
- To get unusual shapes, draw more polygons.

Tom2012 · November 2012

I've updated the example so it's easier to use, taking everything out of main.lua and into it's own file.

PS if anyone would like to look at the code and fix it up I'm sure others would find it most helpful. My solution is a bit 'hacky'.

:-)

Tom2012 · November 2012

Still working on the tiles. I've managed to combine a few different bits of code and get the following working together:

- Box2D
- Scene manager
- Tiles with multiple layers in Tiled
- Polygons and box shapes
- Multiple tilesets on different layers
- Parallax scrolling

This is pretty standard stuff for platformer games like mario so in case anyone in the future needs the code, here's a working example. :-)

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