1.2.0 • Published 2 years ago
tweenyweeny v1.2.0
Tweeny Weeny 🤏
A weeeally tweeny simple tweening library based on EventEmitter3.
Features:
- Full set of easing functions available (including
linear
) - Stop a tween during execution
"start"
,"stop"
,"update"
,"complete"
events available for full lifecycle awareness usingEventEmitter3
API- Re-usable
Tween
instances. Instance keeps last known value persistent and can be re-started
Works in the Browser or Node. For the browser
requestAnimationFrame
is used, where as in NodesetTimeout(0)
is used. Frames are generated at the fastest rate available over the desired duration.
Install
Install as dependency through npm.
npm install tweenyweeny
Usage
Simply create a new Tween
object (optionally passing the desired duration in milliseconds, default is 150ms
).
import { Tween } from "tweenyweeny";
const FROM = 10;
const TO = 20;
const DURATION = 1000; // 1 second
const EASE_FUNCTION = "easeOutQuad";
/* create an instance of Tween, re-use for future animations on same property if required */
const tween = new Tween(DURATION);
/* listen for updates */
tween.on("update", (currentValue) => {
myThing.theProp = currentValue;
});
tween.on("complete", () => {
/* animation done */
});
/* start animation */
tween.start(FROM, TO, EASE_FUNCTION);
/* or use the static method */
Tween.run(
(currentValue) => {
myThing.theProp = currentValue;
},
FROM,
TO,
DURATION,
EASE_FUNCTION
);
Instance API
A Tween
is an EventEmitter3
object, so all of that API is available to listen to events.
Member | Parameters | Return Value | Description |
---|---|---|---|
new Tween([duration]) | * (optional) duration: number - The animation duration in milliseconds (defaults to 150ms) | Tween | Create a new instance of Tween with the optional duration in milliseconds. |
.start(from, to[, easing]) | * from: number - The initial value to start the animation from * to: number - The value to end the animation with * (optional) easing: EasingFunctionName - The name of the easing function to use (defaults to easeOutQuad ) | Promise<void> | Start the animation interpolating between the from and to values using the optional easing function name, return a promise.You can also bind to the complete event to be notified when done. |
.stop() | void | Stop the animation at the current value. | |
.onStart(callback) | * callback: () => void - The callback to bind the start event to | Tween | Shortcut for .on('start', callback) to bind a callback to the start event. |
.onUpdate(callback) | * callback: () => void - The callback to bind the update event to | Tween | Shortcut for .on('update', callback) to bind a callback to the update event. |
.onStop(callback) | * callback: () => void - The callback to bind the stop event to | Tween | Shortcut for .on('stop', callback) to bind a callback to the stop event. |
.onComplete(callback) | * callback: () => void - The callback to bind the complete event to | Tween | Shortcut for .on('complete', callback) to bind a callback to the complete event. |
.isRunning | boolean | Whether the tween is currently running | |
.currentValue | number | The last computed value for the tween. This will persist after the animation completes. |
Events
Event | Callback | Description |
---|---|---|
"start" | (from: number, to: number) => void | Fired when the Tween is started with .start() . Passes the from and to values if needed. |
"update" | (currentValue: number) => void | Fired during each frame of the Tween during animation. Passes the current value. |
"stop" | (currentValue: number) => void | Fired when the Tween is stopped with .stop() or when .start() is called while a tween is running. Passes the current value value if needed. |
"complete" | (from: number, to: number) => void | Fired when the animation completes after calling .start() . Passes the from and to values if needed. |
Static API
Member | Parameters | Return Value | Description |
---|---|---|---|
Tween.run(callback, from, to[, duration, [easing]]) | * callback: (value: number) => void - The update function to call each frame with the current value * from: number - The initial value to start the animation from * to: number - The value to end the animation with * (optional) duration: number - The duration in milliseconds * (optional) easing: EasingFunctionName - The name of the easing function to use (defaults to "easeOutQuad" ) | Promise<void> | Create a new Tween with the given settings and start the animation, returning a promise. |
Tween.defaultDurationMs | number | The default duration to use for new instances. |
Easing Function Names
The following easing function names are available (see https://easings.net for demos):
"linear"
"easeInSine"
"easeOutSine"
"easeInOutSine"
"easeInQuad"
"easeOutQuad"
(default)"easeInOutQuad"
"easeInCubic"
"easeOutCubic"
"easeInOutCubic"
"easeInQuart"
"easeOutQuart"
"easeInOutQuart"
"easeInQuint"
"easeOutQuint"
"easeInOutQuint"
"easeInExpo"
"easeOutExpo"
"easeInOutExpo"
"easeInCirc"
"easeOutCirc"
"easeInOutCirc"
"easeInBack"
"easeOutBack"
"easeInOutBack"
"easeInElastic"
"easeOutElastic"
"easeInOutElastic"
"easeInBounce"
"easeOutBounce"
"easeInOutBounce"
Issues
Please report any issues, feedback, bugs or suggestions here.