phaser4-rex-plugins/templates/spinner/rings/UpdateShapeMethods.js

Plugins of phaser4

import Circle from '../../../plugins/gameobjects/shape/shapes/geoms/lines/arc/Circle.js';
import Yoyo from '../utils/Yoyo.js';

export default {
    buildShapes() {
        for (var i = 0; i < 2; i++) {
            this.addShape(new Circle());
        }
    },

    updateShapes() {
        var centerX = this.centerX;
        var centerY = this.centerY;
        var radius = this.radius;
        var lineWidth = Math.ceil(radius / 25);
        var maxRingRadius = radius - lineWidth;

        var shapes = this.getShapes();
        for (var i = 0, cnt = shapes.length; i < cnt; i++) {
            var ring = shapes[i];
            var t = (this.value + (i / cnt)) % 1;
            var alpha = Yoyo(t);
            ring
                .lineStyle(lineWidth, this.color, alpha)
                .setRadius(t * maxRingRadius)
                .setCenterPosition(centerX, centerY)
        }
    }
}