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https://github.com/playcanvas/playcanvas-tween
A tween library for PlayCanvas
https://github.com/playcanvas/playcanvas-tween
Last synced: about 1 month ago
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A tween library for PlayCanvas
- Host: GitHub
- URL: https://github.com/playcanvas/playcanvas-tween
- Owner: playcanvas
- License: mit
- Created: 2017-01-17T16:01:51.000Z (almost 8 years ago)
- Default Branch: main
- Last Pushed: 2023-09-25T17:00:02.000Z (about 1 year ago)
- Last Synced: 2024-04-24T20:28:14.343Z (8 months ago)
- Language: JavaScript
- Size: 86.9 KB
- Stars: 55
- Watchers: 14
- Forks: 45
- Open Issues: 14
-
Metadata Files:
- Readme: README.md
- Contributing: .github/CONTRIBUTING.md
- License: LICENSE
- Code of conduct: .github/CODE_OF_CONDUCT.md
Awesome Lists containing this project
- awesome-playcanvas - playcanvas-tween - Officially supported tween animation plugin. (Extensions and Utilities)
README
# Overview
This is a tween library for PlayCanvas. You can include `tween.js` in your Project to start using the library.
If you create your application *after* loading this library, you can call the following method to enable
tweening on your application:
```javascript
app.addTweenManager();
```
# Usage
Tweening `pc.Entity` properties looks like this:
```javascript
var tween = entity.tween(fromProperty).to(toProperty, duration, easing);
tween.start();
```
For example, this tweens the entity's local position with duration 1.0 and `SineOut` easing:
```javascript
var tween = entity.tween(entity.getLocalPosition()).to({x: 10, y: 0, z: 0}, 1.0, pc.SineOut);
tween.start();
```
If you are dealing with rotations you should use `rotate` instead of `to`. This takes euler angles and uses an internal quaternion or it can take quaternions to slerp between angles. For example:
```javascript
entity.tween(entity.getLocalEulerAngles()).rotate({x: 0, y: 180, z: 0}, 1.0, pc.Linear);
```
```javascript
entity.tween(entity.getLocalRotation()).rotate(targetQuaternionRotation, 1.0, pc.Linear);
```
You can also tween properties of any other object not just entities. For example:
```javascript
// some object with a property called 'value'
var data = {
value: 0
};
// create a new tween using pc.Application#tween
// passing another object as the target. Any properties
// that are common between the target and the source object
// will be tweened
app.tween(data).to({value: 1}, 1.0, pc.BackOut);
```
# Chaining
You can chain method calls for a tween. For example:
```javascript
// delay, yoyo and loop tween
entity
.tween(entity.getLocalPosition()).to({x: 10, y: 0, z: 0}, 1.0, pc.SineOut)
.delay(1.0)
.yoyo(true)
.loop(true)
.start();
```
# Methods
## `start()`
To start playing a tween call `tween.start()`.
## `stop()`
To stop a tween call `tween.stop()`.
## `pause()`
To pause a tween call `tween.pause()`.
## `resume()`
To resume a paused tween call `tween.resume()`.
## `delay(duration)`
To delay a tween call `tween.delay(duration)` where duration is in seconds.
## `repeat(count)`
To repeat a tween `count` times call `tween.repeat(count)`.
## `loop(true / false)`
To loop a tween forever call `tween.loop(true)`.
## `yoyo(true / false)`
To make a tween play in reverse after it finishes call `tween.yoyo(true)`. Note that to actually see the tween play in reverse in the end, you have to either repeat the tween at least 2 times or set it to loop forever. E.g. to only play a tween from start to end and then from end to start 1 time you need to do:
```javascript
tween.yoyo(true).repeat(2);
```
## `reverse()`
To reverse a tween call `tween.reverse()`.
# Events
To subscribe to events during Tween execution, use a these methods:
## `onUpdate`
This is called on every update cycle. You can use this method to manually update something in your code using the tweened value.
It provides `dt` argument.
E.g.
```javascript
var color = new pc.Color(1, 0, 0);
var tween = app.tween(color).to(new pc.Color(0, 1, 1), 1, pc.Linear);
tween.onUpdate((dt) => {
material.diffuse = color;
material.update();
});
```
## `onComplete`
This is called when the tween is finished. If the tween is looping the `onLoop` will be called instead.
E.g.
```javascript
entity
.tween(entity.getLocalPosition())
.to({x: 10, y: 0, z: 0}, 1, pc.Linear)
.onComplete(() => {
console.log('tween completed');
});
```
## `onLoop`
This is called whenever a looping tween finishes a cycle. This is called instead of the `onComplete` for looping tweens.
E.g.
```javascript
entity
.tween(entity.getLocalPosition())
.to({x: 10, y: 0, z: 0}, 1, pc.Linear)
.loop(true)
.onLoop(() => {
console.log('tween loop');
});
```
# Easing methods
There are various easing methods you can use that change the way that values are interpolated. The available easing methods are:
- `pc.Linear`
- `pc.QuadraticIn`
- `pc.QuadraticOut`
- `pc.QuadraticInOut`
- `pc.CubicIn`
- `pc.CubicOut`
- `pc.CubicInOut`
- `pc.QuarticIn`
- `pc.QuarticOut`
- `pc.QuarticInOut`
- `pc.QuinticIn`
- `pc.QuinticOut`
- `pc.QuinticInOut`
- `pc.SineIn`
- `pc.SineOut`
- `pc.SineInOut`
- `pc.ExponentialIn`
- `pc.ExponentialOut`
- `pc.ExponentialInOut`
- `pc.CircularIn`
- `pc.CircularOut`
- `pc.CircularInOut`
- `pc.BackIn`
- `pc.BackOut`
- `pc.BackInOut`
- `pc.BounceIn`
- `pc.BounceOut`
- `pc.BounceInOut`
- `pc.ElasticIn`
- `pc.ElasticOut`
- `pc.ElasticInOut`
# Tutorial
You can find a tutorial with various use cases [here][1].
[1]: http://developer.playcanvas.com/en/tutorials/tweening/