Method isInsidePath

src/common/overlay/levelRenderer/Area.js:854–1003

* @function LevelRenderer.Tool.Areal.prototype.isInsidePath * @description 与 canvas 一样采用 non-zero winding rule

(pathArray, lineWidth, brushType, x, y)

     * @description 与 canvas 一样采用 non-zero winding rule
     */
    isInsidePath(pathArray, lineWidth, brushType, x, y) {
        var w = 0;
        var xi = 0;
        var yi = 0;
        var x0 = 0;
        var y0 = 0;
        var beginSubpath = true;
        var firstCmd = true;

        brushType = brushType || 'fill';

        var hasStroke = brushType === 'stroke' || brushType === 'both';
        var hasFill = brushType === 'fill' || brushType === 'both';

        // var roots = [-1, -1, -1];
        for (var i = 0; i < pathArray.length; i++) {
            var seg = pathArray[i];
            var p = seg.points;
            // Begin a new subpath
            if (beginSubpath || seg.command === 'M') {
                if (i > 0) {
                    // Close previous subpath
                    if (hasFill) {
                        w += this.windingLine(xi, yi, x0, y0, x, y);
                    }
                    if (w !== 0) {
                        return true;
                    }
                }
                x0 = p[p.length - 2];
                y0 = p[p.length - 1];
                beginSubpath = false;
                if (firstCmd && seg.command !== 'A') {
                    // 如果第一个命令不是M, 是lineTo, bezierCurveTo
                    // 等绘制命令的话，是会从该绘制的起点开始算的
                    // Arc 会在之后做单独处理所以这里忽略
                    firstCmd = false;
                    xi = x0;
                    yi = y0;
                }
            }
            switch (seg.command) {
                case 'M':
                    xi = p[0];
                    yi = p[1];
                    break;
                case 'L':
                    if (hasStroke) {
                        if (this.isInsideLine(
                                xi, yi, p[0], p[1], lineWidth, x, y
                            )) {
                            return true;
                        }
                    }
                    if (hasFill) {
                        w += this.windingLine(xi, yi, p[0], p[1], x, y);
                    }
                    xi = p[0];