konva/lib/shapes/Star.js

HTML5 2d canvas library for interactive graphics, design editors, whiteboards, and diagrams.

import { Factory } from "../Factory.js";
import { Shape } from "../Shape.js";
import { getNumberValidator } from "../Validators.js";
import { _registerNode } from "../Global.js";
/**
 * Star constructor
 * @constructor
 * @memberof Konva
 * @augments Konva.Shape
 * @param {Object} config
 * @param {Integer} config.numPoints
 * @param {Number} config.innerRadius
 * @param {Number} config.outerRadius
 * @@shapeParams
 * @@nodeParams
 * @example
 * var star = new Konva.Star({
 *   x: 100,
 *   y: 200,
 *   numPoints: 5,
 *   innerRadius: 70,
 *   outerRadius: 70,
 *   fill: 'red',
 *   stroke: 'black',
 *   strokeWidth: 4
 * });
 */
export class Star extends Shape {
    _sceneFunc(context) {
        const innerRadius = this.innerRadius(), outerRadius = this.outerRadius(), numPoints = this.numPoints();
        context.beginPath();
        context.moveTo(0, 0 - outerRadius);
        for (let n = 1; n < numPoints * 2; n++) {
            const radius = n % 2 === 0 ? outerRadius : innerRadius;
            const x = radius * Math.sin((n * Math.PI) / numPoints);
            const y = -1 * radius * Math.cos((n * Math.PI) / numPoints);
            context.lineTo(x, y);
        }
        context.closePath();
        context.fillStrokeShape(this);
    }
    getWidth() {
        return this.outerRadius() * 2;
    }
    getHeight() {
        return this.outerRadius() * 2;
    }
    setWidth(width) {
        this.outerRadius(width / 2);
    }
    setHeight(height) {
        this.outerRadius(height / 2);
    }
}
Star.prototype.className = 'Star';
Star.prototype._centroid = true;
Star.prototype._attrsAffectingSize = ['innerRadius', 'outerRadius'];
_registerNode(Star);
/**
 * get/set number of points
 * @name Konva.Star#numPoints
 * @method
 * @param {Number} numPoints
 * @returns {Number}
 * @example
 * // get inner radius
 * var numPoints = star.numPoints();
 *
 * // set inner radius
 * star.numPoints(20);
 */
Factory.addGetterSetter(Star, 'numPoints', 5, getNumberValidator());
/**
 * get/set innerRadius
 * @name Konva.Star#innerRadius
 * @method
 * @param {Number} innerRadius
 * @returns {Number}
 * @example
 * // get inner radius
 * var innerRadius = star.innerRadius();
 *
 * // set inner radius
 * star.innerRadius(20);
 */
Factory.addGetterSetter(Star, 'innerRadius', 0, getNumberValidator());
/**
 * get/set outerRadius
 * @name Konva.Star#outerRadius
 * @method
 * @param {Number} outerRadius
 * @returns {Number}
 * @example
 * // get inner radius
 * var outerRadius = star.outerRadius();
 *
 * // set inner radius
 * star.outerRadius(20);
 */
Factory.addGetterSetter(Star, 'outerRadius', 0, getNumberValidator());