StrokeIntersection 结构
表示笔画上相交段的起点和终点的浮点索引值。
命名空间： Microsoft.Ink
程序集： Microsoft.Ink（在 Microsoft.Ink.dll 中）
语法
声明
Public Structure StrokeIntersection
用法
Dim instance As StrokeIntersection
public struct StrokeIntersection
public value class StrokeIntersection
public final class StrokeIntersection extends ValueType
JScript 支持使用结构，但是不支持新结构的声明。
备注
浮点索引是一个浮点值，表示笔画中两点之间的某个位置。例如，如果 0.0 是笔画中的第一个点，而 1.0 是笔画中的第二个点，则 0.5 位于第一个点和第二个点的正中间。与之类似，值 37.25 表示位于笔画点 37 和 38 之间连线的 25% 的位置。
使用 StrokeIntersection 结构的数组可指示沿 Stroke 对象的多个相交段。
示例
此示例将删除传入的 Stroke 对象在指定 Rectangle 结构内的所有线段。此示例通过检查 StrokeIntersection 结构来确定对传入的 Stroke 对象进行拆分的位置以及要删除的线段，从而实现此操作。
Private Sub DeleteInsideRectangle(ByVal S As Stroke, ByVal R As Rectangle)
' get the StrokeIntersection array
Dim SI() As StrokeIntersection = S.GetRectangleIntersections(R)
' examine each StrokeIntersection
' must work backwards through the array so that when splitting,
' the remaining intersections are still valid for S
For k As Integer = SI.Length - 1 To 0 Step -1
Dim enterRect As Single = SI(k).BeginIndex
Dim exitRect As Single = SI(k).EndIndex
' check if the whole stroke is inside the rectangle
' if so, delete the stroke
If enterRect = -1 And exitRect = -1 Then
S.Ink.DeleteStroke(S)
Continue For
End If
' check if a segment enters and exits the rectangle
' if so, split and delete the segment inside the rectangle
If enterRect > 0 And exitRect > 0 Then
' the stroke resulting from split() is outside, keep it
S.Split(exitRect)
' the stroke from this split() is inside, delete it
Dim temp As Stroke = S.Split(enterRect)
temp.Ink.DeleteStroke(temp)
Continue For
End If
' check if stroke starts inside the rectangle and goes outside
' if so, split and delete the segment inside the rectangle
If enterRect = -1 And exitRect > 0 Then
' the stroke resulting from split() is outside, keep it
S.Split(exitRect)
' delete the remaining segment of the stroke
S.Ink.DeleteStroke(S)
Continue For
End If
' check if stroke starts outside the rectangle and ends inside
' if so, split and delete the segment inside the rectangle
If enterRect > 0 And exitRect = -1 Then
Dim temp2 As Stroke = S.Split(enterRect)
temp2.Ink.DeleteStroke(temp2)
End If
Next
End Sub
private void DeleteInsideRectangle(Stroke S, Rectangle R)
{
// get the StrokeIntersection array
StrokeIntersection[] SI = S.GetRectangleIntersections(R);
// examine each StrokeIntersection
// must work backwards through the array so that when splitting,
// the remaining intersections are still valid for S
for (int k = SI.Length - 1; k >= 0; k--)
{
float enterRect = SI[k].BeginIndex;
float exitRect = SI[k].EndIndex;
// check if the whole stroke is inside the rectangle
// if so, delete the stroke
if (enterRect == -1 && exitRect == -1)
{
S.Ink.DeleteStroke(S);
continue;
}
// check if a segment enters and exits the rectangle
// if so, split and delete the segment inside the rectangle
if (enterRect > 0 && exitRect > 0)
{
// the stroke resulting from split() is outside, keep it
S.Split(exitRect);
// the stroke from this split() is inside, delete it
Stroke temp = S.Split(enterRect);
temp.Ink.DeleteStroke(temp);
continue;
}
// check if stroke starts inside the rectangle and goes outside
// if so, split and delete the segment inside the rectangle
if (enterRect == -1 && exitRect > 0)
{
// the stroke resulting from split() is outside, keep it
S.Split(exitRect);
// delete the remaining segment of the stroke
S.Ink.DeleteStroke(S);
continue;
}
// check if stroke starts outside the rectangle and ends inside
// if so, split and delete the segment inside the rectangle
if (enterRect > 0 && exitRect == -1)
{
Stroke temp2 = S.Split(enterRect);
temp2.Ink.DeleteStroke(temp2);
}
}
}
线程安全
此类型的任何公共 static（在 Visual Basic 中为 Shared） 成员都是线程安全的。但不保证所有实例成员都是线程安全的。
平台
Windows Vista
.NET Framework 和 .NET Compact Framework 并不是对每个平台的所有版本都提供支持。有关支持的版本的列表，请参见.NET Framework 系统要求。
版本信息
.NET Framework
受以下版本支持：3.0