Shape is not rotating

[gabriel_kstro]

My shape is not rotating when I use body:setAngle(). The image on the screen rotates and the value of the variable also but the shape appears to continue in the same place. The shape and physics not rotating with image. Can someone help me?

Code: Select all

function love.load()
 	retangulo = {
 		x=400,
 		y=50,
 		altura =100,
 		largura=200,
 		img = love.graphics.newImage("carro.png")
 	}
 	retangulo2 = {
 		x=50,
 		y=50,
 		altura =100,
 		largura=200,
 		img = love.graphics.newImage("carro2.png")
 	}

 	
 	mundo = love.physics.newWorld(0,0,false)
 	
 	retangulo.body = love.physics.newBody( mundo, retangulo.x, retangulo.y, "dynamic" )
 	retangulo.shape = love.physics.newRectangleShape(0,0, retangulo.img:getWidth(),retangulo.img:getHeight() )
 	retangulo.fixture = love.physics.newFixture( retangulo.body, retangulo.shape,1)


 	retangulo2.body = love.physics.newBody( mundo, retangulo2.x, retangulo2.y, "dynamic" )
 	retangulo2.shape = love.physics.newRectangleShape( retangulo2.img:getWidth(),retangulo2.img:getHeight())
 	retangulo2.fixture = love.physics.newFixture( retangulo2.body, retangulo2.shape)
 	mundo:setCallbacks(beginContact, endContact, preSolve, postSolve)

 	retangulo.body:setAngle(-amath.rad(90))

end

function love.update(dt)
	mundo:update(dt)

	if love.keyboard.isDown ("up") then
			retangulo.body:setY(retangulo.body:getY()-5)
	elseif love.keyboard.isDown ("down") then
			retangulo.body:setY(retangulo.body:getY()+5)
	end
	if love.keyboard.isDown ("right") then
			retangulo.body:setX(retangulo.body:getX()+5)
	elseif love.keyboard.isDown ("left") then
			retangulo.body:setX(retangulo.body:getX()-5)
	end

	print(math.deg(retangulo.body:getAngle()))
end

function love.draw()
	love.graphics.draw(retangulo.img,retangulo.body:getX(),retangulo.body:getY(),retangulo.body:getAngle(),1,1)
	love.graphics.draw(retangulo2.img,retangulo2.body:getX(),retangulo2.body:getY(),retangulo2.body:getAngle())
end

function beginContact(a, b, coll)
 	print("crash")
end
 
function endContact(a, b, coll)
 
end
 
function preSolve(a, b, coll)
 
end
 
function postSolve(a, b, coll, normalimpulse, tangentimpulse)
 
end

[nyenye]

Hii, first of all try writing your code in english, its easier for people of the forum to help you.

About the question, have you tried to apply torque to the body? (https://love2d.org/wiki/Body:applyTorque) Does it rotate?

Havent used love2d's implementation of box2d so can't really say much.

[ken.athomos]

Rough Translation just in case

rectangulo = rectangle
altura = height (or altitude)
largura = width (or length)
mundo = world

If you're wondering how I translated this, I'm Filipino. Most of our modern day words are Spanish.

[0x72]

I believe that it's rotating properly but you're drawing it wrong.

retangulo.body:getX(),retangulo.body:getY() seams to give you the center of the shape (by default at least) while love.graphics.draw's x and y arguments are supposed to be top-left corner.

You can offset it with ox and oy of love.graphics.draw.

Code: Select all

love.graphics.draw(retangulo.img,retangulo.body:getX(), retangulo.body:getY(), retangulo.body:getAngle(), 1, 1, retangulo.largura/2, retangulo.altura/2)

I've never used box2d with love so I might be wrong. In case it helps you: I've used this nice thing: viewtopic.php?t=77140 (I had to pcall it for some reason though)

edit:

Code: Select all

function drawRect(r)
  love.graphics.draw(r.img, r.body:getX, r.body:getY, r.body:getAngle(), 1, 1, r.largura/2, r.altura/2)
end

[nyenye]

Have you tried to draw as this tutorial does? https://love2d.org/wiki/Tutorial:Physics

I can't say it's eficient but at least it should be accurate to the body state/angle.

Good luck!

[gabriel_kstro]

It worked! The shape was in the wrong place and the drawing was adjusted. The debug tool is great! Thanks