How to Make Drag Objects Detect Collision

Getting Started Newbie Questions
#1

I am trying to make it so that when I drag an object towards another drag object, they don’t overlap. But I also don’t want drag object two to move when I drag the first object towards it.

local function onDragTouch( event ) local d = event.target local phase = event.phase if "began" == phase then display.getCurrentStage():setFocus(d) d.isFocus = true d.x0 = event.x - d.x d.y0 = event.y - d.y elseif d.isFocus then if "moved" == phase then d.x = event.x - d.x0 d.y = event.y - d.y0 elseif "ended" == phase or "cancelled" == phase then display.getCurrentStage():setFocus( nil ) d.isFocus = false end end return true end objectOne=display.newRect(100, 100, 100, 100) physics.addBody(objectOne, "static") objectOne:addEventListener("touch", onDragTouch) objectTwo=display.newRect(100, 500, 50, 50) physics.addBody(objectTwo, "static") objectTwo:addEventListener("touch", onDragTouch)

How do I make it happen (with no gravity)? Thanks in advance.

#2

I’ve managed to made the two draggable objects detect collision within each other by setting them as dynamic objects and also set their rotation fixed by using “object.isFixedRotation=true”. My last problem is trying to set the object being hit fixed at its X and Y position. So that when I drag objectOne to hit ObjectTwo…objectTwo won’t move, and vice versa. Any help would be great!

#3

I’ve got this. I set the object that I didn’t want to move to static in the onDragTouch function when the event is at “began” and set it back to normal when event has “ended”. If theres a more efficient or smoother way to do this please let me know. Thanks!

#4

Take a look at the code I posted here: http://forums.coronalabs.com/topic/43458-can-i-disablecancel-touch-if-not-on-object/?p=226840You should only need to remove the one object at a time part. Let me know if you have questions.

#5

We did a blog post last summer on how to detect collisions without physics.  It’s a great method for dragging things around and seeing if they hit other things.

https://coronalabs.com/blog/2013/07/23/tutorial-non-physics-collision-detection/

Rob

#6

I’ve managed to made the two draggable objects detect collision within each other by setting them as dynamic objects and also set their rotation fixed by using “object.isFixedRotation=true”. My last problem is trying to set the object being hit fixed at its X and Y position. So that when I drag objectOne to hit ObjectTwo…objectTwo won’t move, and vice versa. Any help would be great!

#7

I’ve got this. I set the object that I didn’t want to move to static in the onDragTouch function when the event is at “began” and set it back to normal when event has “ended”. If theres a more efficient or smoother way to do this please let me know. Thanks!

#8

Take a look at the code I posted here: http://forums.coronalabs.com/topic/43458-can-i-disablecancel-touch-if-not-on-object/?p=226840You should only need to remove the one object at a time part. Let me know if you have questions.

#9

We did a blog post last summer on how to detect collisions without physics.  It’s a great method for dragging things around and seeing if they hit other things.

https://coronalabs.com/blog/2013/07/23/tutorial-non-physics-collision-detection/

Rob