Lua – Drag Physical Objects in Corona SDK

local function dragBody( event )
 local body = event.target
 local phase = event.phase
 local stage = display.getCurrentStage()

 if "began" == phase then
 stage:setFocus( body, event.id )
 body.isFocus = true
 body.tempJoint = physics.newJoint( "touch", body, event.x, event.y )

 elseif body.isFocus then
 if "moved" == phase then
 body.tempJoint:setTarget( event.x, event.y )

 elseif "ended" == phase or "cancelled" == phase then
 stage:setFocus( body, nil )
 body.isFocus = false
 body .tempJoint:removeSelf()

 end
 end
 return true
end

function scene:createScene( event )
 local group = self.view
 my_square = display.newImage("square.png")
 my_square.x = 60
 my_square.y = 60
 physics.addBody(my_square, "dynamic" )
 group:insert(my_square)

 floor = display.newImage("piso.png")
 floor.x = 160< br /> floor.y = 240
 physics.addBody(floor, "static" )
 group:insert(floor) 
end

I am trying to drag a dynamic object with gravity = 0,0 in my scene, and I have a dynamic body An image of a square and a static body shape, but when dragging the square on the image, this has a little power but can exceed the image and be transferred to the other side like an image:

This is my drag Code of moving block:

local function dragBody( event )
 local body = event.target
 local phase = event. phase
 local stage = display.getCurrentStage()

 if "began" == phase then
 stage:setFocus( body, event.id )
 body.isFocus = true
 body.tempJoint = physics.newJoint( "touch", body, event.x, event.y )

 elseif body.isFocus then
 if "moved" = = phase then
 body.tempJoint:setTarget( event.x, event.y )

 elseif "ended" == phase or "cancelled" == phase then
 stage: setFocus( body, nil )
 body.isFocus = false
 body.tempJoint:removeSelf()

 end
 end
 return true
 end

This is the code to create the object:

function scene:createScene( event )
 local group = self.view
 my_square = display.newImage("square.png")
 my_square.x = 60
 my_square.y = 60
 phy sics.addBody(my_square, "dynamic" )
 group:insert(my_square)

 floor = display.newImage("piso.png")
 floor.x = 160< br /> floor.y = 240
 physics.addBody(floor, "static" )
 group:insert(floor) 
end

Thanks for the help.

When you manually move an object, you are not under the physical control of doing so, basically you can force the object to move past a stationary object.

What you can do is set up collision detection. When you move the square, it will give you an event telling you when to stop moving. Of course, if you don’t follow the movement code, you can continue to move your object.