IMxDrawCurve 接口
控件中的曲线接口,实现了曲线的相关操作,如求曲线的长度,最近点,面积,曲线上任一点在曲线上的长度 切向方向,曲线交点,坐标变换,打断,偏移,离散等功能。
一、返回曲线组成的闭合区域面积
IMxDrawCurve::GetArea
返回曲线组成的闭合区域面积,具体详细如下:
参数说明[out] DOUBLE* pArea返回闭合区域面积
C#代码计算闭合区域面积:
MxDrawPolyline pl = new MxDrawPolyline(); MxDrawPoint pt1 = new MxDrawPoint(); pt1.x = 10; pt1.y = 10; MxDrawPoint pt2 = new MxDrawPoint(); pt2.x = 20; pt2.y = 20; MxDrawPoint pt3 = new MxDrawPoint(); pt3.x = 30.5; pt3.y = 10; pl.AddVertexAt(pt1); pl.AddVertexAt(pt2); pl.AddVertexAt(pt3); pl.IsClosedStatus = true; double dArea = 0.0; pl.GetArea(out dArea);
IMxDrawCurve::GetArea2
返回曲线组成的闭合区域面积。
js代码计算闭合区域面积:
将此段代码放入鼠标事件中:
// 得到鼠标位置var point = mxOcx.NewPoint();point.x = dX;point.y = dY;// 构造择集,得到鼠标所在闭合区域。 // 设置过滤条件var filter = mxOcx.NewResbuf();// 设置PL线为过滤条件filter.AddStringEx("LWPOLYLINE", 5020); // 选择范围左下角var pt1 = mxOcx.NewPoint();pt1.x = point.x - 100;pt1.y = point.y - 100;// 选择范围右上角 var pt2 = mxOcx.NewPoint();pt2.x = point.x + 100;pt2.y = point.y + 100; // 选择pt1,pt2所在范围内的对象.var ss =mxOcx.NewSelectionSet();ss.Select(1, pt1, pt2, filter); for (var i = 0; i < ss.Count; i++){ // 遍历所有对象,看当前点是在那个闭合区域内 var pl =ss.Item(i); var dArea = pl.GetArea2 (); alert("面积为:" + dArea.toString()); }
二、打断曲线
主要用到函数说明:
IMxDrawCurve::SplitCurves
打断曲线,详细说明如下:
参数说明[in] IMxDrawResbuf* aryParam打断位置参数数组,或打断的点数组,是个MxDrawResbuf对象[out] IMxDrawResbuf** aryNewId返回打断后生成的新曲线id,是个MxDrawResbuf对象
c#代码实现如下:
private void DoSplitCurves() { MxDrawUtility mxUtility = new MxDrawUtility(); object getPt; MxDrawEntity ent = mxUtility.GetEntity(out getPt, "选择打断的曲线:"); if (ent == null) return; MxDrawCurve curve; if (ent is MxDrawCurve) { curve = (MxDrawCurve)ent; } else { MessageBox.Show("实体类型不对"); return; } MxDrawPoint getPt1 = (MxDrawPoint)(mxUtility.GetPoint(null, "点取打断位置:")); if (getPt1 == null) { MessageBox.Show("用户取消.."); return; } MxDrawResbuf param = new MxDrawResbuf(); param.AddPoint(getPt1, -10); object objId; if (curve.SplitCurves(param,out objId)) { MxDrawResbuf rbId = (MxDrawResbuf)objId; MessageBox.Show("打断成功,生成的曲线个数:" + rbId.Count); // 把以前的删除掉。 ent.Erase(); } else { MessageBox.Show("打断失败"); } }
选择曲线,把曲线从中间1/4 到 3/ 4处断开:
MxDrawUtility mxUtility = new MxDrawUtility(); object getPt; MxDrawEntity ent = mxUtility.GetEntity(out getPt, "选择打断的曲线:"); if (ent == null) return; MxDrawCurve curve; if (ent is MxDrawCurve) { curve = (MxDrawCurve)ent; } else { MessageBox.Show("实体类型不对"); return; } double dLen = 0.0; curve.GetDistAtParam(curve.GetEndParam(),out dLen); object pt1; if (!curve.GetPointAtDist(dLen / 4.0, out pt1)) return; object pt2; if (!curve.GetPointAtDist(dLen * 3.0 / 4.0, out pt2)) return; MxDrawPoint breakPt1 = (MxDrawPoint)pt1; MxDrawPoint breakPt2 = (MxDrawPoint)pt2; if (breakPt1 == null || breakPt2 == null) return; MxDrawResbuf param = new MxDrawResbuf(); param.AddPoint(breakPt1, -10); param.AddPoint(breakPt2, -10); object objIds; if (curve.SplitCurves(param, out objIds)) { MxDrawResbuf rbId = (MxDrawResbuf)objIds; if(rbId.Count == 3) { axMxDrawX1.Erase(rbId.AtLong(1)); } // 把以前的删除掉。 ent.Erase(); }
js代码打断曲线实现如下:
var ent = mxOcx.GetEntity("选择打断的曲线:"); if (ent == null) return; var curve; if (ent.ObjectName == "McDbSpline") { curve =ent; } else { alert("实体类型不对"); return; } var getPt1 = mxOcx.GetPoint(false,0,0,"\n 点取打断位置:"); if (getPt1 == null) { alert("用户取消.."); return; } var param = mxOcx.NewResbuf(); param.AddPoint(getPt1); var objId = mxOcx.NewResbuf(); if (curve.SplitCurves(param ,objId)) { var rbId = objId; alert("打断成功"); // 把以前的删除掉。 ent.Erase(); } else { alert("打断失败"); }
三、得到曲线长度
主要用到函数说明:
IMxDrawCurve::GetLength2
返回曲线长度
js代码得到曲线长度实现如下: function GetCLength() { var ent = mxOcx.GetEntity("选择曲线:"); if (ent == null) return; var curve; if (ent.ObjectName == "McDbSpline") { curve =ent; } else { alert("实体类型不对"); return; } var curvelen = curve.GetLength2(); alert(curvelen); }
四、得到两曲线的交点
IMxDrawEntity::IntersectWith
求两个实体的交点,具体详细如下:
参数说明[in] IDispatch* pIntersectObject另一个求交实体[in] MCAD_McExtendOption exOption求交方式,现在不支持延伸实体求交点[out,retval] IMxDrawPoints** intersectPoints返回实体的相交点
js代码得到两曲线的交点:
//求曲线的交点 function IntersectPoint() { var ent1 = mxOcx.GetEntity("选择曲线1:"); if (ent1 == null) return; var curve; if (ent1.ObjectName == "McDbSpline") { curve =ent1; } else { alert("实体类型不对"); return; } var ent2 = mxOcx.GetEntity("选择曲线2:"); if (ent2 == null) return; var curve1; if (ent2.ObjectName == "McDbSpline") { curve1 =ent2; } else { alert("实体类型不对"); return; } var points = curve.IntersectWith(curve1, 1); if(points.Count == 0) { alert("没有求到交点"); } else { var pt = points.Item(0); alert("交点为:" + pt.x + "," + pt.y); } }
四、曲线周围一点到曲线上的最近点
主要用到函数说明:
IMxDrawCurve::GetClosestPointTo2
返回曲线长度,具体说明如下:
参数说明[in] IMxDrawPoint* givenPnt任一点[in] VARIANT_BOOL isExtend暂不支持[out,retval] IMxDrawPoint** pPointOnCurve返回曲线上的最近点
js代码求曲线周围一点到曲线上的最近点实现如下: var ent = mxOcx.GetEntity("选择曲线:"); if (ent == null) return; var curve; if (ent.ObjectName == "McDbSpline") { curve =ent; } else { alert("实体类型不对"); return; } var getPt1 = mxOcx.GetPoint(false,0,0,"\n 点取一个点:"); if (getPt1 == null) { alert("用户取消.."); return; } var ClosestPoint = curve.GetClosestPointTo2(getPt1,false); var grtClosestPointx = ClosestPoint.x; var grtClosestPointy = ClosestPoint.y; alert(grtClosestPointx); alert(grtClosestPointy);
五、离散曲线
主要用到函数说明:
IMxDrawCurve::GetSamplePoints
离散曲线,具体说明如下:
参数说明[in] DOUBLE dApproxEps离散后的曲线的最大弧高[out,retval] IMxDrawPoints** ppPointArray返回离散的点数组
js代码实现如下: var ent = mxOcx.GetEntity("选择需要离散的曲线:"); if (ent == null) return; var curve; if (ent.ObjectName == "McDbSpline") { curve =ent; } else { alert("实体类型不对"); return; } var curvelen = curve.GetSamplePoints(1); if (curvelen == null) { return; } var pt = curvelen.Item(0); console.log(pt) mxOcx.PathMoveTo(pt.x, pt.y); for(var i = 1; i < curvelen.Count;i++) { pt = curvelen.Item(i); mxOcx.PathLineTo(pt.x,pt.y) } mxOcx.LineWidth = 10; mxOcx.DrawPathToPolyline();
六、偏移
主要用到函数说明:
IMxDrawCurve::OffsetCurves
曲线偏移,具体说明如下:
参数说明[in] DOUBLE dOffsetDist偏移距离[in] IMxDrawPoint* ptOffsetRef偏移方向参考点,曲线向该点所在位置偏移[out] IMxDrawResbuf** aryNewId返回偏移后新生成的曲线id数组
c#代码实现如下: private void OffsetCurves() { MxDrawUtility mxUtility = new MxDrawUtility(); object getPt; MxDrawEntity ent = mxUtility.GetEntity(out getPt,"选择编移的曲线:"); if (ent == null) return; MxDrawCurve curve; if(ent is MxDrawCurve) { curve = (MxDrawCurve)ent; } else { MessageBox.Show("实体类型不对"); return; } MxDrawPoint getPt1 = (MxDrawPoint)(mxUtility.GetPoint(null, "点取偏移位置:")); if (getPt1 == null) { MessageBox.Show("用户取消.."); return; } MxDrawPoint getPt2 = (MxDrawPoint)(mxUtility.GetPoint(getPt1, "点取偏移距离:")); if (getPt2 == null) { MessageBox.Show("用户取消.."); return; } Double dis = (getPt1.x - getPt2.x) * (getPt1.x - getPt2.x) + (getPt1.y - getPt2.y) * (getPt1.y - getPt2.y); dis = Math.Sqrt(dis); object objId; if(curve.OffsetCurves(dis, getPt1, out objId) ) { MxDrawResbuf rbId = (MxDrawResbuf)objId; MessageBox.Show("偏移生成的曲线个数:" + rbId.Count); } }
js代码实现如下:var ent = mxOcx.GetEntity("选择偏移的曲线:");if (ent == null) return; var curve;curve =ent; var getPt1 = mxOcx.GetPoint(false,0,0,"\n 点取偏移位置:"); if(getPt1 == null) { return; } var getPt2 = mxOcx.GetPoint(true,getPt1.x,getPt1.y,"\n 点取偏移距离:"); if(getPt2 == null) { return; } var dis = (getPt1.x - getPt2.x) * (getPt1.x - getPt2.x) + (getPt1.y - getPt2.y) * (getPt1.y - getPt2.y); dis = Math.sqrt(dis); //dis = Math.sqrt(); //var objId; var objId = mxOcx.NewResbuf(); if(curve.OffsetCurves2(dis, getPt1)) { var rbId = objId; // 把以前的删除掉。 ent.Erase(); }
七、绘制pl线
js代码实现如下:function DrawPolyline(){ var mxOcx = document.all.item("MxDrawXCtrl"); mxOcx.focus(); var point1 = mxOcx.GetPoint(false,0,0,"\n 点取开始点:"); if(point1 == null) { return; } //mxOcx.PathMoveToEx(point1.x,point1.y,10,10,0.0); mxOcx.PathMoveTo(point1.x,point1.y); var point2 = mxOcx.GetPoint(true,point1.x,point1.y,"\n 点取下一个:"); if(point2 == null) { return; } var tmpobj = new Array(); //mxOcx.PathLineToEx(point2.x,point2.y,10,10,0.0); mxOcx.PathLineTo(point2.x,point2.y); var iCount = 0; var id = mxOcx.DrawLine(point1.x,point1.y,point2.x,point2.y); tmpobj[iCount] = id; iCount = iCount + 1; point1 = point2; while(true) { var point2 = mxOcx.GetPoint(true,point1.x,point1.y,"\n 点取下一个:"); if(point2 == null) { break; } mxOcx.PathLineTo(point2.x,point2.y); var id = mxOcx.DrawLine(point1.x,point1.y,point2.x,point2.y); tmpobj[iCount] = id; iCount = iCount + 1; point1 = point2; } var i = 0; for(;i < iCount;i++) { mxOcx.Erase(tmpobj ); } var lId = mxOcx.DrawPathToPolyline(); // 把新绘的pl线变成双线。 var param = mxOcx.Call("Mx_NewResbuf",""); param.AddLong(lId); // 双线的宽度。 var lineWidth = 2; param.AddDouble(lineWidth); // 调用变双线函数。 var ret = mxOcx.CallEx("ExApp_MakeDoubleLine",param); if(ret.AtString(0) == "Ok") { // 返回的绘制的双线对象id. alert(ret.AtLong(1)); } // 删除旧的pl线。 mxOcx.Erase(lId); }
八、由曲线上的一点返回该点到曲线开始点的长度
主要用到函数说明:
IMxDrawCurve::GetDistAtPoint
由曲线上的一点返回该点到曲线开始点的长度,具体说明如下:
参数说明[in] IMxDrawPoint* point曲线上的一点[out] DOUBLE* pDis返回到开始点的曲线上长度
js代码实现如下: var ent = mxOcx.GetEntity("选择曲线:"); if (ent == null) return; var curve; if (ent.ObjectName == "McDbSpline") { curve =ent; } else { alert("实体类型不对"); return; } var getPt1 = mxOcx.GetPoint(false,0,0,"\n 点取一个点:"); if (getPt1 == null) { alert("用户取消.."); return; } if (curve.GetDistAtPoint2(getPt1)) { alert(curve.GetDistAtPoint2(getPt1)); } else { alert("失败"); }
九、返回指定参数在曲线上,到开始点的曲线上长度
主要用到函数说明:
IMxDrawCurve::GetDistAtParam
返回指定参数在曲线上,到开始点的曲线上长度,具体说明如下:
参数说明[in] DOUBLE dParam曲线参数[out] DOUBLE* pDis返回到开始点的曲线上长度
js代码实现如下: var ent = mxOcx.GetEntity("选择曲线:"); if (ent == null) return; var curve; if (ent.ObjectName == "McDbSpline") { curve =ent; } else { alert("实体类型不对"); return; } var curvelen = curve.GetEndParam(); if (curve.GetDistAtParam2(curvelen)) { var my = curve.GetDistAtParam2(curvelen); alert(my); } else { alert("失败"); }
十、得到指定参数在曲线上的点坐标
主要用到函数说明:
IMxDrawCurve::GetPointAtParam
得到指定参数在曲线上的点坐标,具体说明如下:
参数说明[in] DOUBLE dParam曲线上的参数[out] IMxDrawPoint** pPoint返回曲线的点
js代码实现如下: var ent = mxOcx.GetEntity("选择曲线:"); if (ent == null) return; var curve; if (ent.ObjectName == "McDbSpline") { curve =ent; } else { alert("实体类型不对"); return; } var curvelen = curve.GetStartParam(); if (curve.GetPointAtParam2(curvelen)) { var my = curve.GetPointAtParam2(curvelen); alert(my.x); alert(my.y); } else { alert("失败"); }
十一、返回曲线上一点在曲线上的参数
主要用到函数说明:
IMxDrawCurve::GetParamAtPoint
返回曲线上一点在曲线上的参数,具体说明如下:
参数说明[in] IMxDrawPoint* point曲线的点[out] DOUBLE* pParam返回曲线上的参数
js代码实现如下: var ent = mxOcx.GetEntity("选择曲线:"); if (ent == null) return; var curve; if (ent.ObjectName == "McDbSpline") { curve =ent; } else { alert("实体类型不对"); return; } var getPt1 = mxOcx.GetPoint(false,0,0,"\n 点取一个点:"); if (getPt1 == null) { alert("用户取消.."); return; } if (curve.GetParamAtPoint2(getPt1)) { alert(curve.GetParamAtPoint2(getPt1)); } else { alert("失败"); }
十二、求曲线参数所在位置的一价导数,这就是切向方向
主要用到函数说明:
IMxDrawCurve::GetFirstDeriv
求曲线参数所在位置的一价导数,这就是切向方向,具体说明如下:
参数说明[in] DOUBLE dParam曲线参数[out] IMxDrawVector3d** pFirstDeriv返回切向方向
js代码实现如下: var ent = mxOcx.GetEntity("选择曲线:"); if (ent == null) return; var curve; if (ent.ObjectName == "McDbLine") { curve =ent; } else { alert("实体类型不对"); return; } var curvelen = curve.GetEndParam(); if (curve.GetFirstDeriv2(curvelen)) { var my = curve.GetFirstDeriv2(curvelen); alert(my.x); alert(my.y); } else { alert("失败"); }
十三、返回曲线上到开始点的曲线长度对应的曲线参数
主要用到函数说明:
IMxDrawCurve::GetParamAtDist
返回曲线上到开始点的曲线长度对应的曲线参数,具体说明如下:
参数说明[in] DOUBLE dDis到开始点的曲线上长度[out] DOUBLE* pParam返回曲线参数
js代码实现如下: var ent = mxOcx.GetEntity("选择曲线:"); if (ent == null) return; var curve; curve =ent; var curvelen = curve.GetLength2(); var my = curve.GetParamAtDist2(0); alert(my); if (curve.GetParamAtDist2(curvelen)) { alert(curve.GetParamAtDist2(curvelen)); } else { alert("失败"); }
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