Collision no worky :(

[Doodee]

Howdy,

Been mulling over posting this for a while as I had hoped to figure it out myself but so far I have had no luck.

I am trying to get collision detection working, I have tried a few different methods but resorted to a modification of the tutorial.

Code: Select all

function love.load()

world = love.physics.newWorld(2000, 1000) --Create a physical word
world:setGravity(0, 50) --Add the gravity 
world:setCallbacks(add, persist, rem, result)

ground = love.physics.newBody (world, 0, 0, 0) --Add a body for the ground 
ground_shape = love.physics.newRectangleShape(ground, 400, 590, 600, 10) -- Create the ground shape at (400,500) with size (600,10). 
 

--love.graphics.setBackgroundColor(127, 195, 247)
bodies = {}
shapes = {}

bodies.body1 = love.physics.newBody(world, 700, 200) -- add a body for the ball
bodies.body2 = love.physics.newBody(world, 700, 400) -- add a body for the ball2

-- 100 units is roughly 1 meter (3 feet)
 
shapes.ball_1 = love.physics.newCircleShape(bodies.body1, 0,0, 20)
shapes.ball_1:setData("Ball1")
shapes.ball_2 = love.physics.newCircleShape(bodies.body2, 0, 0, 10.5)
shapes.ball_2:setData("Ball2")

bodies.body1:setMassFromShapes() -- Set the mass according to the shapes. 
bodies.body2:setMassFromShapes()

	
function love.update(dt)
	world:update(dt)
	
	local speed_up = -2
		if love.keyboard.isDown('up') then
		local x, y = bodies.body1:getPosition()
		local w,z = bodies.body1:getLinearVelocity()		
			bodies.body1:setLinearVelocity(w, z + speed_up)
		end
		
		if love.keyboard.isDown('down') then
		local x, y = bodies.body1:getPosition()
		local w,z = bodies.body1:getLinearVelocity()
--		local speed_up = -30
			bodies.body1:setLinearVelocity(w, z - speed_up)
		end
		
		if love.keyboard.isDown('left') then
		local x, y = bodies.body1:getPosition()
		local w,z = bodies.body1:getLinearVelocity()
--		local speed_up = -30
			bodies.body1:setLinearVelocity(w + speed_up, z)
		end
		
		if love.keyboard.isDown('right') then
		local x, y = bodies.body1:getPosition()
		local w,z = bodies.body1:getLinearVelocity()
--		local speed_up = -30
			bodies.body1:setLinearVelocity(w - speed_up, z)
		end
					
end
 
function love.draw()
	
	love.graphics.setColor(22, 213, 58)
	love.graphics.circle("fill", bodies.body1:getX(), bodies.body1:getY(), shapes.ball_1:getRadius(), 5000)
	love.graphics.setColor(255,128,0)
	love.graphics.circle("line", bodies.body1:getX(), bodies.body1:getY(), shapes.ball_1:getRadius())
	
	love.graphics.setColor(222, 113, 58)
	love.graphics.circle("fill", bodies.body2:getX(), bodies.body2:getY(), shapes.ball_2:getRadius(), 5000)
	love.graphics.setColor(255,228,0)
	love.graphics.circle("line", bodies.body2:getX(), bodies.body2:getY(), shapes.ball_2:getRadius())
	
	love.graphics.print(text,0,12)
	
end

text = ""

function add(a, b, coll)
    text = text..a.." collding with "..b.." at an angle of "..coll:getNormal().."\n"
end

function persist(a, b, coll)
    text = text..a.." touching "..b.."\n"
end

function rem(a, b, coll)
    text = text..a.." uncolliding "..b.."\n"
end

function result(a, b, coll)
    text = text..a.." hit "..b.."resulting with "..coll:getNormal().."\n"
end

end

Any ideas?

[kikito]

This might be quite an stupid suggestion but... have you tried declaring the callbacks at the beginning, before love.load?

[bartbes]

That is not required, what is required though is that you define them outside of your love.load function, I see no reason for doing what you are doing anyway.

[kikito]

ha! I didn't see that one. You can close the love.load function just after this line:

Code: Select all

bodies.body2:setMassFromShapes()

And remove the "end" at the end. It will probably work.

[Doodee]

Thanks. I am a little more enlightened now


I think I'm getting somewhere now. It crashes now due to concatenating a nil value.
I'll keep at it though.

[nevon]

I think I'm getting somewhere now. It crashes now due to concatenating a nil value.
I'll keep at it though.

You're trying to concatenate the uninitialized variable text with a in your world callbacks.

[Robin]

A quick fix would be to replace it by:

Code: Select all

    text = (text or '')..a.." touching "..b.."\n"

(be sure to do that in every place)