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[i] );
}
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"
);
}
|