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Viewing file:     Star.js (1.35 KB)      -rw-r--r--

/**
 * n角星（n>3）
 * @module zrender/graphic/shape/Star
 */

import Path from '../Path';

var PI = Math.PI;
var cos = Math.cos;
var sin = Math.sin;

export default Path.extend({

    type: 'star',

    shape: {
        cx: 0,
        cy: 0,
        n: 3,
        r0: null,
        r: 0
    },

    buildPath: function (ctx, shape) {

        var n = shape.n;
        if (!n || n < 2) {
            return;
        }

        var x = shape.cx;
        var y = shape.cy;
        var r = shape.r;
        var r0 = shape.r0;

        // 如果未指定内部顶点外接圆半径，则自动计算
        if (r0 == null) {
            r0 = n > 4
                // 相隔的外部顶点的连线的交点，
                // 被取为内部交点，以此计算r0
                ? r * cos(2 * PI / n) / cos(PI / n)
                // 二三四角星的特殊处理
                : r / 3;
        }

        var dStep = PI / n;
        var deg = -PI / 2;
        var xStart = x + r * cos(deg);
        var yStart = y + r * sin(deg);
        deg += dStep;

        // 记录边界点，用于判断inside
        ctx.moveTo(xStart, yStart);
        for (var i = 0, end = n * 2 - 1, ri; i < end; i++) {
            ri = i % 2 === 0 ? r0 : r;
            ctx.lineTo(x + ri * cos(deg), y + ri * sin(deg));
            deg += dStep;
        }

        ctx.closePath();
    }
});