梦想CAD控件关于曲线问题
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
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
IMxDrawResbuf* aryParam
打断位置参数数组,或打断的点数组,是个MxDrawResbuf对象
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
IDispatch* pIntersectObject
另一个求交实体
MCAD_McExtendOption exOption
求交方式,现在不支持延伸实体求交点
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
functionIntersectPoint() {
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
IMxDrawPoint* givenPnt
任一点
VARIANT_BOOL isExtend
暂不支持
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
DOUBLE dApproxEps
离散后的曲线的最大弧高
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
DOUBLE dOffsetDist
偏移距离
IMxDrawPoint* ptOffsetRef
偏移方向参考点,曲线向该点所在位置偏移
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 = 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 = 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
IMxDrawPoint* point
曲线上的一点
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
DOUBLE dParam
曲线参数
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
DOUBLE dParam
曲线上的参数
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
IMxDrawPoint* point
曲线的点
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
DOUBLE dParam
曲线参数
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
DOUBLE dDis
到开始点的曲线上长度
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");
}
页:
[1]