public void SnapInfoCurve(ObjectSnapContext context, ObjectSnapInfo result)
{
var cv = context.PickedObject as Curve;
if (cv == null)
{
return;
}
double startParam = cv.StartParam;
double endParam = cv.EndParam;
if (startParam == endParam)
{
return;
}
double param = startParam + ((endParam - startParam) * 0.25);
var pt = cv.GetPointAtParameter(param);
result.SnapPoints.Add(pt);
param = startParam + ((endParam - startParam) * 0.75);
pt = cv.GetPointAtParameter(param);
result.SnapPoints.Add(pt);
if (cv.Closed)
{
pt = cv.StartPoint;
result.SnapPoints.Add(pt);
}
}
public void SnapInfoPolyline(ObjectSnapContext context, ObjectSnapInfo result)
{
var pl = context.PickedObject as Polyline;
if (pl == null)
{
return;
}
double plStartParam = pl.StartParam;
double plEndParam = pl.EndParam;
double startParam = plStartParam;
double endParam = startParam + 1.0;
while (endParam <= plEndParam)
{
double param = startParam + ((endParam - startParam) * 0.25);
var pt = pl.GetPointAtParameter(param);
result.SnapPoints.Add(pt);
param = startParam + ((endParam - startParam) * 0.75);
pt = pl.GetPointAtParameter(param);
result.SnapPoints.Add(pt);
startParam = endParam;
endParam += 1.0;
}
}
public void SnapInfoPolyline(
ObjectSnapContext context,
ObjectSnapInfo result)
{
// For polylines
var pl = context.PickedObject as Polyline;
if (pl == null)
{
return;
}
// Get the overall start and end parameters
double plStartParam = pl.StartParam;
double plEndParam = pl.EndParam;
// Get the local
double startParam = plStartParam;
double endParam = startParam + 1.0;
while (endParam <= plEndParam)
{
// Calculate the snap point per vertex...
// Add osnap at first quarter
double param =
startParam + ((endParam - startParam) * 0.25);
var pt = pl.GetPointAtParameter(param);
result.SnapPoints.Add(pt);
// Add osnap at third quarter
param =
startParam + ((endParam - startParam) * 0.75);
pt = pl.GetPointAtParameter(param);
result.SnapPoints.Add(pt);
startParam = endParam;
endParam += 1.0;
}
}
public void CurveSnap(ObjectSnapContext context, ObjectSnapInfo result)
{
Curve curve = (Curve)context.PickedObject; //当前捕捉到的曲线对象
Point3dCollection snaps = result.SnapPoints; //获取对象的捕捉点集合
if (curve.Closed)
{
return; //如果为闭合曲线，则返回
}
double startParam = curve.StartParam; //曲线的起点参数
double endParam = curve.EndParam; //曲线的终点参数
//将与曲线起点的距离为1/3曲线长度的点作为捕捉点
snaps.Add(curve.GetPointAtParameter(startParam + ((endParam - startParam) / 3)));
//将与曲线起点的距离为2/3曲线长度的点作为捕捉点
snaps.Add(curve.GetPointAtParameter(startParam + ((endParam - startParam) * 2 / 3)));
}
public void SnapInfoCurve(
ObjectSnapContext context,
ObjectSnapInfo result
)
{
// For any curve
var cv = context.PickedObject as Curve;
if (cv == null)
{
return;
}
double startParam = cv.StartParam;
double endParam = cv.EndParam;
// Added a check to avoid zero-length curve problems
if (startParam == endParam)
{
return;
}
// Add osnap at first quarter
double param =
startParam + ((endParam - startParam) * 0.25);
var pt = cv.GetPointAtParameter(param);
result.SnapPoints.Add(pt);
// Add osnap at third quarter
param =
startParam + ((endParam - startParam) * 0.75);
pt = cv.GetPointAtParameter(param);
result.SnapPoints.Add(pt);
if (cv.Closed)
{
pt = cv.StartPoint;
result.SnapPoints.Add(pt);
}
}
public void SnapInfoEntity(
ObjectSnapContext context,
ObjectSnapInfo result)
{
// Nothing here
}
