How to implement double tapping?

l.zajaczkowski.93 · January 27, 2017, 8:23pm

Hi!

Well, this is my first post here, so hello everyone!

Ok, to the point. Right now I am creating an endless runner game and I’m trying to implement double-tapping. To be more clear:

The Player touches the screen for a short while -> the character jumps as long as the Player is touching the screen (to a maximum degree, obviously ) - this I have already implemented thanks to the Getting started tutorial.
The Player double taps the screen -> the gravity is “reversed”, in a way.

I’ve searched the forum for similar issues but couldn’t find anything like that or similar. I have also already implemented reversing/inversing the gravity but I have a huuuge problem when it comes to implementing the double tap.

I’ve tried action.repeated (and by the way learnt how it really works ) and even nesting action.pressed in a condition that contains action.released but id doesn’t seem to work. My guess is that those actions would have to happen really quickly, and I mean really quickly - in the same frame which is, well, next to impossible.

So, could you please help me out with this one? I’de be more than grateful! Thanks for your help in advance!

Lucas

britzl · January 27, 2017, 11:47pm

I implemented a gesture detector module that can be used to correctly identify gestures such as swipe-left/right, tap, long press and double tap. Take a look here: https://github.com/britzl/ludobits/blob/master/ludobits/m/gesture.lua Perhaps you can use it as inspiration for your own project?

l.zajaczkowski.93 · January 29, 2017, 1:55pm

This is great! Thank you so much!

bensawyer · October 25, 2021, 2:47pm

FYI it’s a been a while but this link is broken…

Mathias_Westerdahl · October 25, 2021, 2:56pm

Some quick research in that repo reveals that the code was moved to https://github.com/britzl/defold-input

bensawyer · October 25, 2021, 2:56pm

I did do that I just hadn’t wanted to paste anything and have it not be exactly what @Britzl wanted for others to see.

britzl · October 25, 2021, 8:18pm

Correct, my gesture detection module was moved to a separate project with a bunch of other input related modules:

github.com

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

# Gestures
Use the Gesture module to detect gestures such as swipes, long press and double tap. It also supports two finger gestures. You can use the Gesture module either via the ```gesture.script``` or directly via ```gesture.lua```.

# Using gesture.script
Attach the ```gesture.script``` to the game object that should detect gestures. Configure the script properties if necessary. When a gesture is detected the script will generate an ```on_gesture``` message and send that to the game object.

	function on_message(self, message_id, message, sender)
		if message_id == hash("on_gesture") then
			if message.swipe_right then
				print(message.swipe.from, message.swipe.to)
			elseif message.tap then
				print(message.tap.position)
			elseif message.double_tap then
				print(message.double_tap.position)
			elseif message.long_press then
				print(g.long_press.position, message.long_press.time)
			end
		end
	end

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