ArcGIS Pro SDK (九)几何 9 立方贝塞尔线段
ArcGIS Pro SDK (九)几何 9 立方贝塞尔线段
文章目录
- ArcGIS Pro SDK (九)几何 9 立方贝塞尔线段
- 1 构建立方贝塞尔线段 - 从坐标
- 2 构建立方贝塞尔线段 - 从地图点
- 3 构造立方贝塞尔线段 - 从映射点的枚举
- 4 立方贝塞尔线段生成器属性
- 5 立方贝塞尔线段属性
- 6 构造折线 - 从立方贝塞尔线段
环境:Visual Studio 2022 + .NET6 + ArcGIS Pro SDK 3.0
(图片来源网络,侵删)1 构建立方贝塞尔线段 - 从坐标
// 使用 builderEx 的便捷方法或使用 builderEx 构造函数。 MapPoint startPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0, 3.0); MapPoint endPt = MapPointBuilderEx.CreateMapPoint(2.0, 2.0, 3.0); Coordinate2D ctrl1Pt = new Coordinate2D(1.0, 2.0); Coordinate2D ctrl2Pt = new Coordinate2D(2.0, 1.0); // BuilderEx 的便捷方法不需要在 MCT 上运行 CubicBezierSegment bezier = CubicBezierBuilderEx.CreateCubicBezierSegment(startPt, ctrl1Pt, ctrl2Pt, endPt, SpatialReferences.WGS84); // 不使用空间参考系 bezier = CubicBezierBuilderEx.CreateCubicBezierSegment(startPt, ctrl1Pt, ctrl2Pt, endPt); // builderEx 的构造函数不需要在 MCT 上运行 CubicBezierBuilderEx cbbEx = new CubicBezierBuilderEx(startPt, ctrl1Pt, ctrl2Pt, endPt); bezier = cbbEx.ToSegment() as CubicBezierSegment; // 另一种方式 cbbEx = new CubicBezierBuilderEx(startPt, ctrl1Pt.ToMapPoint(), ctrl2Pt.ToMapPoint(), endPt); bezier = cbbEx.ToSegment() as CubicBezierSegment;
2 构建立方贝塞尔线段 - 从地图点
// 使用 builderEx 的便捷方法或使用 builderEx 构造函数。 MapPoint startPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0, SpatialReferences.WGS84); MapPoint endPt = MapPointBuilderEx.CreateMapPoint(2.0, 2.0, SpatialReferences.WGS84); MapPoint ctrl1Pt = MapPointBuilderEx.CreateMapPoint(1.0, 2.0, SpatialReferences.WGS84); MapPoint ctrl2Pt = MapPointBuilderEx.CreateMapPoint(2.0, 1.0, SpatialReferences.WGS84); // BuilderEx 的便捷方法不需要在 MCT 上运行 CubicBezierSegment bezier = CubicBezierBuilderEx.CreateCubicBezierSegment(startPt, ctrl1Pt, ctrl2Pt, endPt); // builderEx 的构造函数不需要在 MCT 上运行 CubicBezierBuilderEx cbbEx = new CubicBezierBuilderEx(startPt, ctrl1Pt, ctrl2Pt, endPt); bezier = cbbEx.ToSegment() as CubicBezierSegment;
3 构造立方贝塞尔线段 - 从映射点的枚举
// 使用 builderEx 的便捷方法或使用 builderEx 构造函数。 MapPoint startPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0, SpatialReferences.WGS84); MapPoint endPt = MapPointBuilderEx.CreateMapPoint(2.0, 2.0, SpatialReferences.WGS84); MapPoint ctrl1Pt = MapPointBuilderEx.CreateMapPoint(1.0, 2.0, SpatialReferences.WGS84); MapPoint ctrl2Pt = MapPointBuilderEx.CreateMapPoint(2.0, 1.0, SpatialReferences.WGS84); List listMapPoints = new List(); listMapPoints.Add(startPt); listMapPoints.Add(ctrl1Pt); listMapPoints.Add(ctrl2Pt); listMapPoints.Add(endPt); // BuilderEx 的便捷方法不需要在 MCT 上运行 CubicBezierSegment bezier = CubicBezierBuilderEx.CreateCubicBezierSegment(listMapPoints); // builderEx 的构造函数不需要在 MCT 上运行 CubicBezierBuilderEx cbbEx = new CubicBezierBuilderEx(listMapPoints); bezier = cbbEx.ToSegment() as CubicBezierSegment;
4 立方贝塞尔线段生成器属性
// 获取贝塞尔曲线的控制点 CubicBezierBuilderEx cbbEx = new CubicBezierBuilderEx(bezierSegment); MapPoint startPtEx = cbbEx.StartPoint; Coordinate2D ctrlPt1Ex = cbbEx.ControlPoint1; Coordinate2D ctrlPt2Ex = cbbEx.ControlPoint2; MapPoint endPtEx = cbbEx.EndPoint; // 或使用 QueryCoords 方法 cbbEx.QueryCoords(out startPtEx, out ctrlPt1Ex, out ctrlPt2Ex, out endPtEx);
5 立方贝塞尔线段属性
// 获取贝塞尔曲线的控制点 CubicBezierSegment cb = CubicBezierBuilderEx.CreateCubicBezierSegment(bezierSegment); MapPoint startPt = cb.StartPoint; Coordinate2D ctrlPt1 = cb.ControlPoint1; Coordinate2D ctrlPt2 = cb.ControlPoint2; MapPoint endPt = cb.EndPoint; bool isCurve = cb.IsCurve; double len = cb.Length;
6 构造折线 - 从立方贝塞尔线段
Polyline polyline = PolylineBuilderEx.CreatePolyline(bezierSegment);
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