Dragging factory created game objects

Valkyrie_64 · December 14, 2022, 3:31pm

I have an object that was factory created. The plan is to have the mouse be held down, then the object will move with the mouse until it is let go. All of the mouse movement things I have seen have been relating to following or going to the last clicked position, so I was wondering if this was even possible, and how to do it.

Thanks for the help

britzl · December 14, 2022, 3:56pm

You can use a game object with a collision object which follows the mouse cursor and then have a collision object on the created object. When the two collide you can also check mouse button state to move it around.

Here’s a ready to use solution for this:

github.com

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

# 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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HTML5 demo (select Cursor example): Defold-Input 0.1

anon95708182 · December 14, 2022, 7:35pm

Hello there,

have you seen the great videos by Tactx Studios:Defold videos. Number 3 deals, amongst other things, with dragging and dropping and gives a good explanation of the solution @britzl has posted.

Valkyrie_64 · January 4, 2023, 3:26pm

Thank you for the help, I’ve got it to work