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const arcSweep = endAngleInRadian - startAngleInRadian <= Math.PI ? 0 : 1;\n return [\n ['M', start.x, start.y],\n ['A', radius, radius, 0, arcSweep, 1, end.x, end.y],\n ];\n}\n\n/**\n * @ignore\n * 从数据模型中的 points 换算角度\n * @param shapeModel\n * @param coordinate\n * @returns\n */\nexport function getAngle(shapeModel: ShapeInfo, coordinate: Coordinate) {\n const points = shapeModel.points;\n const box = getPointsBox(points);\n let endAngle;\n let startAngle;\n const { startAngle: coordStartAngle, endAngle: coordEndAngle } = coordinate;\n const diffAngle = coordEndAngle - coordStartAngle;\n\n if (coordinate.isTransposed) {\n endAngle = box.maxY * diffAngle;\n startAngle = box.minY * diffAngle;\n } else {\n endAngle = box.maxX * diffAngle;\n startAngle = box.minX * diffAngle;\n }\n endAngle += coordStartAngle;\n startAngle += coordStartAngle;\n return {\n startAngle,\n endAngle,\n };\n}\n\n/**\n * @ignore\n * 计算多边形重心: https://en.wikipedia.org/wiki/Centroid#Of_a_polygon\n */\nexport function getPolygonCentroid(xs: number | number[], ys: number | number[]) {\n if (isNumber(xs) && isNumber(ys)) {\n // 普通色块图，xs 和 ys 是数值\n return [xs, ys];\n }\n let i = -1;\n let x = 0;\n let y = 0;\n let former;\n let current = (xs as number[]).length - 1;\n let diff;\n let k = 0;\n while (++i < (xs as number[]).length) {\n former = current;\n current = i;\n k += diff = xs[former] * ys[current] - xs[current] * ys[former];\n x += (xs[former] + xs[current]) * diff;\n y += (ys[former] + ys[current]) * diff;\n }\n k *= 3;\n return [x / k, y / k];\n}\n\n/**\n * @ignore\n * 获取需要替换的属性，如果原先图形元素存在，而新图形不存在，则设置 undefined\n */\nexport function getReplaceAttrs(sourceShape: IShape, targetShape: IShape) {\n const originAttrs = sourceShape.attr();\n const newAttrs = targetShape.attr();\n each(originAttrs, (v, k) => {\n if (newAttrs[k] === undefined) {\n newAttrs[k] = undefined;\n }\n });\n return newAttrs;\n}\n"]} |