在实际生产需要中，有些情况 我们需要知道某个路径上整体的中心点，如水管，电阻丝这些，可能需要从路径的中点开始进行放置，这个实例我们来看如何进行中点的计算与标记。我们默认路径都是是直线和圆弧组成，均相切(辅助中心线不包含在路径长度内)。
- ，问题：如何找到下面路径的中心点在哪里？进行标识，方便加工。
2，思路：
- 先得到指定草图中的所有“线段”，把中心线排除掉之后，遍历并统计出它们的长度，从而得到总长L。并且还要得到一整串的“线段”顺序。可以考虑 链 相关的数据结构
- 从起点或者终点开始，对每一段进行遍历，去找到中点所在的“线段”， 直到找到中点之后，通过“线段” 的参考进行计算。
- 画出中点，或者能标识中点位置的辅助线。
3，代码：这里很久前写的，没有写什么注释，并且水平也很菜，估计很多人看不太懂。
public void CreateHeaterCenter(string heaterPathName)
{
ISketchPoint startPoint = null;
ISketchPoint endPoint = null;
List<SegmentData> list = new List<SegmentData>();
List<SegmentData> list2 = new List<SegmentData>();
List<SegmentData> list3 = new List<SegmentData>();
List<SegmentData> list4 = new List<SegmentData>();
_swApp.ActivateDoc(_swPartModel.GetTitle());
_swPartModel.ShowNamedView2("*Front", 1);
ISketchArc arc;
double length;
list2.Clear();
list.Clear();
_swPartModel.Extension.SelectByID2(heaterPathName, "SKETCH", 0.0, 0.0, 0.0, true, 0, null, 0);
_swPartModel.ViewZoomToSelection();
ISelectionMgr iSelectionManager = _swPartModel.ISelectionManager;
IFeature feature = iSelectionManager.GetSelectedObject6(1, 0);
ISketch sketch = feature.GetSpecificFeature2();
Array array = sketch.GetSketchSegments();
Array array2 = sketch.GetSketchPoints2();
foreach (ISketchSegment segment in array)
{
ISketchSegment segment2 = segment;
segment2.Select(true);
if (!segment2.ConstructionGeometry)
{
if (segment2.GetType() == 0)
{
ISketchLine line = (ISketchLine)segment2;
startPoint = line.IGetStartPoint2();
endPoint = line.IGetEndPoint2();
}
if (segment2.GetType() == 1)
{
arc = (ISketchArc)segment2;
startPoint = arc.IGetStartPoint2();
endPoint = arc.IGetEndPoint2();
}
SegmentData item = new SegmentData(segment2, startPoint, endPoint);
list.Add(item);
}
_swPartModel.ClearSelection2(true);
}
for (int i = 0; i < list.Count; i++)
{
int num9 = 0;
list2.Add(list[0]);
list.Remove(list[0]);
for (int m = 0; m < list.Count; m++)
{
list2[0].Segment.Select(false);
list[m].Segment.Select(false);
if ((Math.Round(list2[0].StartPoint.X, 5) == Math.Round(list[m].StartPoint.X, 5)) && (Math.Round(list2[0].StartPoint.Y, 5) == Math.Round(list[m].StartPoint.Y, 5)))
{
num9++;
}
if ((Math.Round(list2[0].EndPoint.X, 5) == Math.Round(list[m].EndPoint.X, 5)) && (Math.Round(list2[0].EndPoint.Y, 5) == Math.Round(list[m].EndPoint.Y, 5)))
{
num9++;
}
if ((Math.Round(list2[0].EndPoint.X, 5) == Math.Round(list[m].StartPoint.X, 5)) && (Math.Round(list2[0].EndPoint.Y, 5) == Math.Round(list[m].StartPoint.Y, 5)))
{
num9++;
}
if ((Math.Round(list2[0].StartPoint.X, 5) == Math.Round(list[m].EndPoint.X, 5)) && (Math.Round(list2[0].StartPoint.Y, 5) == Math.Round(list[m].EndPoint.Y, 5)))
{
num9++;
}
_swPartModel.ClearSelection2(true);
if (num9 == 2)
{
list.Add(list2[0]);
list2.Remove(list2[0]);
break;
}
}
if (num9 == 1)
{
list2[0].Segment.Select(true);
break;
}
}
int num = 0;
for (int j = 0; j < list.Count; j++)
{
list2[num].Segment.Select(true);
list[j].Segment.Select(false);
if ((Math.Round(list2[num].StartPoint.X, 5) == Math.Round(list[j].StartPoint.X, 5)) && (Math.Round(list2[num].StartPoint.Y, 5) == Math.Round(list[j].StartPoint.Y, 5)))
{
list2.Add(list[j]);
list.Remove(list[j]);
num++;
j = -1;
}
else if ((Math.Round(list2[num].EndPoint.X, 5) == Math.Round(list[j].EndPoint.X, 5)) && (Math.Round(list2[num].EndPoint.Y, 5) == Math.Round(list[j].EndPoint.Y, 5)))
{
list2.Add(list[j]);
list.Remove(list[j]);
num++;
j = -1;
}
else if ((Math.Round(list2[num].EndPoint.X, 5) == Math.Round(list[j].StartPoint.X, 5)) && (Math.Round(list2[num].EndPoint.Y, 5) == Math.Round(list[j].StartPoint.Y, 5)))
{
list2.Add(list[j]);
list.Remove(list[j]);
num++;
j = -1;
}
else if ((Math.Round(list2[num].StartPoint.X, 5) == Math.Round(list[j].EndPoint.X, 5)) && (Math.Round(list2[num].StartPoint.Y, 5) == Math.Round(list[j].EndPoint.Y, 5)))
{
list2.Add(list[j]);
list.Remove(list[j]);
num++;
j = -1;
}
}
_swPartModel.ClearSelection();
_swPartModel.Extension.SelectByID2(heaterPathName, "SKETCH", 0.0, 0.0, 0.0, false, 0, null, 0);
_swPartModel.EditSketch();
foreach (ISketchPoint point3 in array2)
{
point3.Select(false);
if (point3.Type == 1)
{
_swPartModel.EditDelete();
}
}
double num2 = 0.0;
foreach (SegmentData data2 in list2)
{
data2.Segment.Select(false);
length = data2.Segment.GetLength();
num2 += length;
}
_swPartModel.ClearSelection();
double num4 = num2 / 2.0;
length = 0.0;
int num5 = 0;
double num6 = 0.0;
for (int k = 0; k < list2.Count; k++)
{
list2[k].Segment.Select(false);
length += list2[k].Segment.GetLength();
if (num4 < length)
{
num5 = k;
double num7 = Math.Abs((double)(length - num4));
num6 = (list2[num5].Segment.GetLength() - num7) / list2[num5].Segment.GetLength();
break;
}
}
_swPartModel.ClearSelection();
if (list2[num5].Segment.GetType() == 0)
{
double num13 = 0.0;
double x = list2[num5].StartPoint.X;
double y = list2[num5].StartPoint.Y;
double num16 = list2[num5].EndPoint.X;
double num17 = list2[num5].EndPoint.Y;
if ((Math.Round(num16, 6) == Math.Round(list2[num5 - 1].StartPoint.X, 6)) && (Math.Round(num17, 6) == Math.Round(list2[num5 - 1].StartPoint.Y, 6)))
{
num16 = list2[num5].StartPoint.X;
num17 = list2[num5].StartPoint.Y;
x = list2[num5].EndPoint.X;
y = list2[num5].EndPoint.Y;
}
else if ((Math.Round(num16, 6) == Math.Round(list2[num5 - 1].EndPoint.X, 6)) && (Math.Round(num17, 6) == Math.Round(list2[num5 - 1].EndPoint.Y, 6)))
{
num16 = list2[num5].StartPoint.X;
num17 = list2[num5].StartPoint.Y;
x = list2[num5].EndPoint.X;
y = list2[num5].EndPoint.Y;
}
double pointX = x + ((num16 - x) * num6);
double pointY = y + ((num17 - y) * num6);
_swPartModel.SetAddToDB(true);
if (_swPartModel.CreatePoint2(pointX, pointY, 0.0) != null)
{
_swPartModel.SketchAddConstraints("sgFixed");
}
if (x == num16)
{
num13 = 1.5707963267948966;
}
if (y == num17)
{
num13 = 3.1415926535897931;
}
if ((x != num16) && !(y == num17))
{
num13 = Math.Atan((num17 - y) / (num16 - x));
}
if (num13 > 3.1415926535897931)
{
num13 -= 3.1415926535897931;
}
ISketchSegment segment3 = _swPartModel.ICreateLine2(pointX + (0.005 * Math.Cos(num13 + 1.5707963267948966)), pointY + (0.005 * Math.Sin(num13 + 1.5707963267948966)), 0.0, pointX + (0.005 * Math.Cos(num13 + 4.71238898038469)), pointY + (0.005 * Math.Sin(num13 + 4.71238898038469)), 0.0);
_swPartModel.SketchAddConstraints("sgFIXED");
segment3.ConstructionGeometry = true;
_swPartModel.SetAddToDB(false);
_swPartModel.ClearSelection2(true);
_swPartModel.InsertSketch2(true);
}
if (list2[num5].Segment.GetType() == 1)
{
arc = (ISketchArc)list2[num5].Segment;
startPoint = arc.IGetStartPoint2();
endPoint = arc.IGetEndPoint2();
ISketchPoint point4 = arc.IGetCenterPoint2();
int rotationDir = arc.GetRotationDir();
double num21 = 0.0;
double num22 = 0.0;
double num23 = list2[num5].Segment.GetLength();
double radius = arc.GetRadius();
double num25 = (num6 * num23) / radius;
double num26 = startPoint.X;
double num27 = startPoint.Y;
double num28 = endPoint.X;
double num29 = endPoint.Y;
double num30 = point4.X;
double num31 = point4.Y;
if ((Math.Round(num28, 6) == Math.Round(list2[num5 - 1].StartPoint.X, 6)) && (Math.Round(num29, 6) == Math.Round(list2[num5 - 1].StartPoint.Y, 6)))
{
num26 = endPoint.X;
num27 = endPoint.Y;
rotationDir = -1 * rotationDir;
}
else if ((Math.Round(num28, 6) == Math.Round(list2[num5 - 1].EndPoint.X, 6)) && (Math.Round(num29, 6) == Math.Round(list2[num5 - 1].EndPoint.Y, 6)))
{
num26 = endPoint.X;
num27 = endPoint.Y;
rotationDir = -1 * rotationDir;
}
if ((num30 != num26) && !(num31 == num27))
{
num21 = Math.Atan((num31 - num27) / (num30 - num26));
}
if (Math.Round(num30, 8) == Math.Round(num26, 8))
{
if (Math.Round(num31, 8) > Math.Round(num27, 8))
{
num21 = 4.71238898038469;
}
else if (Math.Round(num31, 8) < Math.Round(num27, 8))
{
num21 = 1.5707963267948966;
}
}
else if (Math.Round(num31, 8) == Math.Round(num27, 8))
{
if (Math.Round(num30, 8) > Math.Round(num26, 8))
{
num21 = 3.1415926535897931;
}
else if (Math.Round(num30, 8) < Math.Round(num26, 8))
{
if (rotationDir > 0)
{
num21 = 0.0;
}
else
{
num21 = 6.2831853071795862;
}
}
}
if ((Math.Round(num30, 8) < Math.Round(num26, 8)) && (Math.Round(num31, 8) < Math.Round(num27, 8)))
{
num22 = num21 + (rotationDir * num25);
}
else if ((Math.Round(num30, 8) < Math.Round(num26, 8)) && (Math.Round(num31, 8) > Math.Round(num27, 8)))
{
num22 = (6.2831853071795862 + num21) + (rotationDir * num25);
}
else if ((Math.Round(num30, 8) > Math.Round(num26, 8)) && (Math.Round(num31, 8) > Math.Round(num27, 8)))
{
num22 = (3.1415926535897931 + num21) + (rotationDir * num25);
}
else if ((Math.Round(num30, 8) > Math.Round(num26, 8)) && (Math.Round(num31, 8) < Math.Round(num27, 8)))
{
num22 = (3.1415926535897931 + num21) + (rotationDir * num25);
}
else if (Math.Round(num30, 8) == Math.Round(num26, 8))
{
num22 = num21 + (rotationDir * num25);
}
else if (Math.Round(num31, 8) == Math.Round(num27, 8))
{
num22 = num21 + (rotationDir * num25);
}
num22 = Math.Round(num22, 6);
double num32 = num30 + (radius * Math.Cos(num22));
double num33 = num31 + (radius * Math.Sin(num22));
bool flag29 = true;
if (_swPartModel.Extension.SelectByID2("", "SKETCHPOINT", num32, num33, 0.0, false, 0, null, 0))
{
ISketchPoint point5 = iSelectionManager.GetSelectedObject6(0, 1);
if ((point5 != null) && ((Math.Round(point5.X, 6) == Math.Round(num32, 6)) && (Math.Round(point5.Y, 6) == Math.Round(num33, 6))))
{
flag29 = false;
}
}
_swPartModel.SetAddToDB(true);
if (flag29 && (_swPartModel.CreatePoint2(num32, num33, 0.0) != null))
{
_swPartModel.SketchAddConstraints("sgFIXED");
_swPartModel.ICreateLine2(num30, num31, 0.0, num32, num33, 0.0).ConstructionGeometry = true;
}
_swPartModel.SetAddToDB(false);
_swPartModel.ClearSelection2(true);
_swPartModel.InsertSketch2(true);
}
}
运行结果如下图：
CAD中验证正确 ：
源代码下载:
