Drag and drop mouse not colliding

britzl · April 27, 2022, 2:25pm

The “problem” is that you are using RenderCam but you are not providing a correct translation from mouse position to world position for your cursor. This is mentioned in the cursor documentation:

github.com

britzl/defold-input/blob/master/in/cursor.md#input-handling

# Cursor
Use the cursor script to simplify user interaction such as clicking and dragging of game objects.

# Usage
Attach the `cursor.script` to a game object that should act as a cursor. The game object must have either a kinematic or trigger collision object with a group and mask that matches other collision objects that should be able to interact with the cursor.

IMPORTANT: You must make sure to configure the cursor.script `action_id` field (see below) to match the binding you have in your input bindings for the left mouse button/mouse button 1. The script assumes that the binding has action set to `touch`.

## Script properties
The script has the following [script properties](https://defold.com/manuals/script-properties/):

* `action_id` - (hash) The action_id that corresponds to a press/click/interact action (default: "touch")
* `drag` - (boolean) If the cursor should be able to drag game objects
* `drag_lock_x` - (boolean) If a dragged game object should have movement locked to the horizontal axis
* `drag_lock_y` - (boolean) If a dragged game object should have movement locked to the vertical axis
* `drag_threshold` - (number) Distance the cursor has to move from a pressed object before it's considered dragged
* `collisionobject_filter` - (hash) Id of a collision object component. If specified the cursor script will only accept collision messages from this id.
* `acquire_input_focus` - (boolean) Check if the script should acquire input and handle input events itself
* `notify_own_gameobject` - (boolean) Check if cursor messages should be sent not only to the interacting game object but also to the game object this script is attached to.

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You need to forward converted coordinates. Disable the “acquire input focus” checkbox of the cursor.script and update your controller.script like this:

local rendercam = require "rendercam.rendercam"

function init(self)
	msg.post(".", "acquire_input_focus")
end

function on_input(self, action_id, action)
	local pos = rendercam.screen_to_world_2d(action.x, action.y)
	action.x = pos.x
	action.y = pos.y
	msg.post("#cursor", "input", { action_id = action_id, action = action })
end