StrokeIntersection - структура
Обновлен: Ноябрь 2007
Represents the floating point index values where an intersection begins and ends on a stroke.
Пространство имен: Microsoft.Ink
Сборка: Microsoft.Ink (в Microsoft.Ink.dll)
Синтаксис
'Декларация
Public Structure StrokeIntersection
'Применение
Dim instance As StrokeIntersection
public struct StrokeIntersection
public value class StrokeIntersection
public final class StrokeIntersection extends ValueType
JScript поддерживает использование структур, но не объявление новых структур.
Заметки
A floating point index is a float value that represents a location somewhere between two points in the stroke. As examples, if 0.0 is the first point in the stroke and 1.0 is the second point in the stroke, 0.5 is halfway between the first and the second points. Similarly, a value of 37.25 represents a location that is 25 percent along the line between points 37 and 38 of the stroke.
Use an array of StrokeIntersection structures to indicate multiple intersections along a Stroke object.
Примеры
In this example, all segments of a passed Stroke object that are inside the specified Rectangle structure are deleted. This is acomplished by examining the StrokeIntersection structures to determine where to split the passed Stroke object, and which segments to delete.
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);
}
}
}
Потокобезопасность
Любые открытые члены этого типа, объявленные как static (Shared в Visual Basic), являются потокобезопасными. Потокобезопасность членов экземпляров не гарантируется.
Платформы
Windows Vista
Среды .NET Framework и .NET Compact Framework поддерживают не все версии каждой платформы. Поддерживаемые версии перечислены в разделе Требования к системе для .NET Framework.
Сведения о версии
.NET Framework
Поддерживается в версии: 3.0