How to select GO with touch and them move it with another? (SOLVED)

Questions
1

Hello!

I am very new to Defold and I need your help:

I have a gameobject(with planet sprite and collision object with sphere shape) and another gameobject(it should be a cursor). My plan is to make movement of planet that way:
1)User clicks on planet(selects it)
2)User clicks on place it should be moved to
3)Planet moves to that place

I have no problem with 2 and 3 steps(I read tutorials and so on), but I have difficultes in 1 step.
I am trying to make it with collisions, but I don’t understand how it works, I haven’t found any examples.

2

An example of clicking on game objects with touch/mouse input you can find here (Cursor and Gesture Demo):

Check out if something from this asset might be useful for you with its demo:

https://britzl.github.io/Defold-Input/

This might make things easier for you. If you would like to write it on your own - you will need to convert action screen coordinates to your world coordinates - it depends then on what camera you are using - is it a game with one screen or can you move around your view around the world (space in your case I guess :smiley: ) . If you are using Rendercam or Defold Orhtographic Camera for this - then they have conversion functions already :wink:

2 Likes
3

Thanks!

But I am afraid this is not the thing I actually need.

I have this script for cursor right now:

function init(self)
	msg.post(".", "acquire_input_focus") 
	
	self.collided_id = nil     -- id of gameobject which the cursor collided with
	self.dragged_pos = nil		-- The position of the dragged_id game object
	self.owned = false
	
end

function on_input(self, action_id, action)
	

	if action_id == hash("touch") then
		msg.post("#collisionobject", "enable")
		local position = vmath.vector3(action.x, action.y, 0)
		go.set_position(position, ".")
	
	end	

		
end

function on_message(self, message_id, message, sender)
	-- check for the message
	if message_id == hash("collision_response") then
		-- take action
		print("I collided with", message.other_id)
	end
end
--[[

Don’t care about unused variables. This script controls cursor, moves its GO when detects touch on screen. But, when I click on another GO with Collision Object, it doesn’t work!

Have I made any mistake?

1 Like
4

Sometimes a GO with a collision object doesn’t move because of the type of collision object (some of them are immovable). Try changing the type of collision object to see if that helps.

5

It doesn’t even collide. If it collided, it would print a message in console(as defined in script). But it doesn’t.

Both of objects are kinematic.

6

What are the groups/masks of your collision objects? That’s a potential pitfall.

Check this out:

2 Likes
7

Thanks!

But both of collision objects(cursor and planet) are DEFAULT group and mask.

8

I was able to solve this issue:

Problem was in location of planet. Sprite was on 60, 60, 0 and its collision object on 0,0,0)

1 Like
9

Great, that you found the cause! :blush::+1:

1 Like