Drag physic object in corona sdk

Question

I'm try to drag a dynamic body with gravity = 0,0 in my scene, I have a square with body type dynamic, and an image with body type static, but when drag the square over the image this have a little force but can exceed the image and pass to the other side like the images:

This is my code to drag the square:

  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

And this is the code to create the objects:

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
    floor.y = 240
    physics.addBody(floor, "static" )
    group:insert(floor)   
end

thanks for help.

Answer 1

First, I recommed you to try:

physics.setContinuous( false )

If you did that already:

There are 3 different physics type in Physics2D engine. For drag purposes you can use "Kinematic" object type. But if its an obligation to use a Dynamic object as a dragable object, there may be bugs in collisions. But if your static object will be same every time, you can control it in drag function.

I have implemented a little mobile game using same thing that you want to achieve. Here is the link: https://itunes.apple.com/tr/app/bricks-world/id602065172?mt=8

If you think that you want something similar in this game, just leave a comment^^ I can help further.

P.S : In the game, the controller paddle is dynamic and walls around the screen are static.

Another Solution:

local lastX, lastY
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
                lastX, lastY = body.x, body.y
        elseif body.isFocus then
                if "moved" == phase then
                        -- You can change 1's with another value.
                        if(event.x > lastX) body.x = body.x + 1
                        else body.x = body.x - 1

                        if(event.y > lastY) body.y = body.y + 1
                        else body.y = body.y - 1

                        lastX, lastY = body.x, body.y

                elseif "ended" == phase or "cancelled" == phase then
                        stage:setFocus( body, nil )
                        body.isFocus = false
                end
        end
        return true
end