| 1 | 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{ BBox } from '@antv/g-svg';\nimport { each, isEmpty, isNumber, isNumberEqual } from '@antv/util';\nimport { Coordinate, IShape, Point } from '../dependents';\nimport { ShapeInfo } from '../interface';\n\n// 获取图形的包围盒\nfunction getPointsBox(points) {\n if (isEmpty(points)) {\n return null;\n }\n\n let minX = points[0].x;\n let maxX = points[0].x;\n let minY = points[0].y;\n let maxY = points[0].y;\n each(points, (point) => {\n minX = minX > point.x ? point.x : minX;\n maxX = maxX < point.x ? point.x : maxX;\n minY = minY > point.y ? point.y : minY;\n maxY = maxY < point.y ? point.y : maxY;\n });\n\n return {\n minX,\n maxX,\n minY,\n maxY,\n centerX: (minX + maxX) / 2,\n centerY: (minY + maxY) / 2,\n };\n}\n\n/**\n * @ignore\n * 根据弧度计算极坐标系下的坐标点\n * @param centerX\n * @param centerY\n * @param radius\n * @param angleInRadian\n * @returns\n */\nexport function polarToCartesian(centerX: number, centerY: number, radius: number, angleInRadian: number) {\n return {\n x: centerX + radius * Math.cos(angleInRadian),\n y: centerY + radius * Math.sin(angleInRadian),\n };\n}\n\n/**\n * @ignore\n * 根据起始角度计算绘制扇形的 path\n * @param centerX\n * @param centerY\n * @param radius\n * @param startAngleInRadian\n * @param endAngleInRadian\n * @returns\n */\nexport function getSectorPath(\n centerX: number,\n centerY: number,\n radius: number,\n startAngleInRadian: number,\n endAngleInRadian: number,\n innerRadius: number = 0\n) {\n const start = polarToCartesian(centerX, centerY, radius, startAngleInRadian);\n const end = polarToCartesian(centerX, centerY, radius, endAngleInRadian);\n\n const innerStart = polarToCartesian(centerX, centerY, innerRadius, startAngleInRadian);\n const innerEnd = polarToCartesian(centerX, centerY, innerRadius, endAngleInRadian);\n\n if (endAngleInRadian - startAngleInRadian === Math.PI * 2) {\n // 整个圆是分割成两个圆\n const middlePoint = polarToCartesian(centerX, centerY, radius, startAngleInRadian + Math.PI);\n const innerMiddlePoint = polarToCartesian(centerX, centerY, innerRadius, startAngleInRadian + Math.PI);\n const circlePathCommands = [\n ['M', start.x, start.y],\n ['A', radius, radius, 0, 1, 1, middlePoint.x, middlePoint.y],\n ['A', radius, radius, 0, 1, 1, end.x, end.y],\n ['M', innerStart.x, innerStart.y],\n ];\n if (innerRadius) {\n circlePathCommands.push(['A', innerRadius, innerRadius, 0, 1, 0, innerMiddlePoint.x, innerMiddlePoint.y]);\n circlePathCommands.push(['A', innerRadius, innerRadius, 0, 1, 0, innerEnd.x, innerEnd.y]);\n }\n\n circlePathCommands.push(['M', start.x, start.y]);\n circlePathCommands.push(['Z']);\n\n return circlePathCommands;\n }\n\n const arcSweep = endAngleInRadian - startAngleInRadian <= Math.PI ? 0 : 1;\n const sectorPathCommands = [\n ['M', start.x, start.y],\n ['A', radius, radius, 0, arcSweep, 1, end.x, end.y],\n ['L', innerEnd.x, innerEnd.y],\n ];\n if (innerRadius) {\n sectorPathCommands.push(['A', innerRadius, innerRadius, 0, arcSweep, 0, innerStart.x, innerStart.y]);\n }\n sectorPathCommands.push(['L', start.x, start.y]);\n sectorPathCommands.push(['Z']);\n\n return sectorPathCommands;\n}\n\n/**\n * @ignore\n * Gets arc path\n * @param centerX\n * @param centerY\n * @param radius\n * @param startAngleInRadian\n * @param endAngleInRadian\n * @returns\n */\nexport function getArcPath(\n centerX: number,\n centerY: number,\n radius: number,\n startAngleInRadian: number,\n endAngleInRadian: number\n) {\n const start = polarToCartesian(centerX, centerY, radius, startAngleInRadian);\n const end = polarToCartesian(centerX, centerY, radius, endAngleInRadian);\n\n if (isNumberEqual(endAngleInRadian - startAngleInRadian, Math.PI * 2)) {\n const middlePoint = polarToCartesian(centerX, centerY, radius, startAngleInRadian + Math.PI);\n return [\n ['M', start.x, start.y],\n ['A', radius, radius, 0, 1, 1, middlePoint.x, middlePoint.y],\n ['A', radius, radius, 0, 1, 1, start.x, start.y],\n ['A', radius, radius, 0, 1, 0, middlePoint.x, middlePoint.y],\n ['A', radius, radius, 0, 1, 0, start.x, start.y],\n ['Z'],\n ];\n }\n 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"]} |