How to detect click on a game object? (SOLVED)

ThatFreeModelDude · June 24, 2020, 8:08pm

How can I make a game object click event? I know how to make a GUI click event, but I can’t figure out how to do the same for Game Objects. Here’s an example of what I want to do.

Lets say that I have a game object, and in it, is a box sprite. I also have another game object which is the background. I created a script which creates a click event. What I want is the click event to happen on the box. Here a code example:

Now, when I made this script I put it in the box game object. Now, when I run it, It does work. It responds to when I click, but I want it to respond ONLY when I click the box. Because if I click anywhere, it still responds. How do I make it only respond to one spot. How can I do this?
Also, I have found ways to do this online, and it does work, but the problem is that the game I am working on makes the game object move. I found an online script that would create an invisible box around the game object and it respond to only that spot, but when I move the game object around the invisible box doesn’t follow. Is there a way to make the invisible box follow the game object? Here’s the invisible box code I found:

Denis_Makhortov · June 22, 2020, 5:36am

If you need to check the click on a rectangular area, then you can use this beautiful and clear post:

You can make this a little easier with the next module if you use sprite:

github.com

dapetcu21/crit/blob/master/crit/pick.lua

local M = {}

local h_size = hash("size")

local no_padding = {
  left = 0,
  right = 0,
  bottom = 0,
  top = 0,
}

function M.pick_sprite(url, x, y, padding)
  local transform = go.get_world_transform(url)
  local pos = vmath.inv(transform) * vmath.vector4(x, y, 0, 1)
  x, y = pos.x, pos.y

  local size = go.get(url, h_size)
  padding = padding or no_padding

  local half_width = size.x * 0.5

This file has been truncated. show original

If you need to track a click on a shape of a complex shape, then there is a wonderful library with support for drag and other interesting things:

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_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.

## Input handling
You can let the cursor react to input in several ways:

This file has been truncated. show original

And if you need to perfectly check the complex shape, then you can take advantage of my project. But this is almost always not necessary:

ThatFreeModelDude · June 24, 2020, 6:52pm

thanks for letting me know!