ngx-wheel

## [Click here for demo](https://ngx-wheel.web.app/)

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ngx-wheel

Click here for demo

npm version npm
ngx-wheel is an open-source Angular library which creates a dynamic prize-winning wheel. It is used to display predetermined winnings while appearing to be random to the user. This can be used to allow a server to determine the prize before the wheel spins, then the wheel would spin and land on the prize that the server selected.

example

Installation

To install this library, run:
$ npm install ngx-wheel --save

Then inside your index.html file located in the src directory add these 2 lines to the <head> tag:
<script src="https://rawcdn.githack.com/zarocknz/javascript-winwheel/229a47acc3d7fd941d72a3ba9e1649751fd10ed5/Winwheel.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/latest/TweenMax.min.js"></script>

Usage

Import the module
import { NgxWheelModule } from 'ngx-wheel'; //<-- import here

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    NgxWheelModule  //<-- and here
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Once your library is imported, you can use its main component, ngx-wheel in your Angular application:
<ngx-wheel
  width='600'
  height='600'
  spinDuration='8'
  [disableSpinOnClick]='true'
  [items]='items'
  [innerRadius]='50'
  [spinAmount]='10'
  [textOrientation]='textOrientation'
  [textAlignment]='textAlignment'
  pointerStrokeColor='red'
  pointerFillColor='purple'
  [idToLandOn]='idToLandOn'
  (onSpinStart)='before()'
  (onSpinComplete)='after()'
>
</ngx-wheel>

Options

Inputs

  • height is the height of the wheel canvas
  • width is the width of the wheel canvas
  • spinDuration is the number of seconds the wheel wil be spinning for
  • spinAmount is the number of spins the wheel will make before stopping
  • innerRadius is the inner radius of the wheel. Allows you to make the wheel hollow from the center
  • pointerStrokeColor is the color of the pointer's stroke
  • pointerFillColor is the color of the pointer's fill
  • textAlignment and textOrientation both have the types TextAlignment and TextOrientation, respectively. Check the Full Reference for visual examples.
  • disableSpinOnClick disabled the default behaviour of spinning the wheel on clicking it. See this section
  • idToLandOn is the id value of the item to land on (Can be fetched from server)
  • items is an array of of JSON objects that represent thw wheel's segments. Check the Full Reference for more details.

Outputs

  • onSpinStart is called before the wheel spin
  • onSpinComplete is called after the wheel spin

Accessing wheel functions

A couple of common use cases that were frequently requested was the ability to spin the wheel on button click and re-spinning the wheel. This is easily doable in version 4+.
  • Pass true to the disableSpinOnClick prop to disable spinning when clicking on the wheel. This is optional.

  • Add a ref #wheel to the wheel (any name works):
<ngx-wheel
  #wheel
  width='600'
  height='600'
  spinDuration='8'
  [disableSpinOnClick]='true'
  [items]='items'
  [innerRadius]='50'
  [spinAmount]='10'
  pointerStrokeColor='red'
  pointerFillColor='purple'
  [idToLandOn]='idToLandOn'
  (onSpinStart)='before()'
  (onSpinComplete)='after()'
>
</ngx-wheel>
  • In your parent component ts file, refer to the wheel using ViewChild
import { ..., ViewChild, ... } from '@angular/core';
import { NgxWheelComponent } from 'ngx-wheel';

// ...

export class ParentComponent {
   @ViewChild(NgxWheelComponent, { static: false }) wheel;

   ngAfterViewInit() {
      console.log('only after THIS EVENT "wheel" is usable!!');
      // Call the spin function whenever and wherever you want after the AfterViewInit Event
      this.wheel.spin();
   }

   reset(){
      // Reset allows you to redraw the wheel
      // Use it after any change to wheel configurations or to allow re-spinning
      this.wheel.reset();
   }
}

One thing to keep in mind when using the spin function this way. If you want to change the idToLandOn, you need to wait for a tick before calling the spin function in order for the update to propagate:
async spin(prize) {
  this.idToLandOn = prize
  await new Promise(resolve => setTimeout(resolve, 0)); // Wait here for one tick
  this.wheel.spin()
}

License

MIT © Ahmed El Sayegh