Renderer.PixelToInkSpace メソッド (Graphics, Point%)

2008-10-28

変換用の Graphics オブジェクトを使用して、ピクセル空間座標での位置を、インク空間座標での位置に変換します。

名前空間 : Microsoft.Ink
アセンブリ : Microsoft.Ink (Microsoft.Ink.dll 内)

構文

'宣言
Public Sub PixelToInkSpace ( _
    g As Graphics, _
    ByRef pt As Point _
)
'使用
Dim instance As Renderer
Dim g As Graphics
Dim pt As Point

instance.PixelToInkSpace(g, pt)

public void PixelToInkSpace(
    Graphics g,
    ref Point pt
)

public:
void PixelToInkSpace(
    Graphics^ g, 
    Point% pt
)

public void PixelToInkSpace(
    Graphics g,
    /** @ref */Point pt
)

public function PixelToInkSpace(
    g : Graphics, 
    pt : Point
)

パラメータ

g
型 : System.Drawing.Graphics
変換に使用する Graphics オブジェクト。これは、多くの場合 System.Windows.Forms.Control.CreateGraphics メソッドまたはイベント引数から取得されます。

pt
型 : System.Drawing.Point%
インク空間位置に変換するポイント。

解説

PixelToInkSpace メソッドは、ピクセル空間からインク空間に変換し (1 HIMETRIC 単位 = 0.01mm)、ビュー変換の逆を適用して、オブジェクト変換を適用します。

例

この例では、渡された InkOverlay オブジェクトの中で、パラメータ LeftInPixels よりも (ピクセル空間で) 左側にある Point を含むすべての Stroke オブジェクトを削除するメソッドを示します。

Private Sub DeleteStrokesByLeft(ByVal mInkOverlay As InkOverlay, ByVal LeftInPixels As Integer)
    ' Create a Point object based upon the Left parameter
    Dim ptLeft As Point = New Point(LeftInPixels, 0)

    ' Convert the point from pixel space to ink space dimensions
    ' InkOverlay.AttachedControl must be set
    Using g As Graphics = mInkOverlay.AttachedControl.CreateGraphics()
        mInkOverlay.Renderer.PixelToInkSpace(g, ptLeft)
    End Using

    ' Create a Strokes object to hold strokes to be deleted
    Dim strokesToDelete As Strokes = mInkOverlay.Ink.CreateStrokes()

    ' Access to the Strokes property returns a copy of the Strokes object.
    ' This copy must be implicitly (via using statement) or explicitly
    ' disposed of in order to avoid a memory leak.
    Using currentStrokes As Strokes = mInkOverlay.Ink.Strokes
        For Each S As Stroke In currentStrokes
            For Each strokePoint As Point In S.GetPoints()
                If (strokePoint.X < ptLeft.X) Then
                    ' Note: A particluar Stroke object might have several
                    ' points to the left of ptLeft.X - Therefore, the
                    ' following statement will be executed multiple times.
                    ' Even so, the Add method will not add the same stroke twice. 
                    strokesToDelete.Add(S)
                End If
            Next
        Next
    End Using
    If strokesToDelete.Count > 0 Then
        mInkOverlay.Ink.DeleteStrokes(strokesToDelete)
        mInkOverlay.AttachedControl.Invalidate()
    End If
    strokesToDelete.Dispose()
End Sub

private void DeleteStrokesByLeft(InkOverlay mInkOverlay, int LeftInPixels)
{
    // Create a Point object based upon the Left parameter
    Point ptLeft = new Point(LeftInPixels, 0);

    // Convert the point from pixel space to ink space dimensions
    // InkOverlay.AttachedControl must be set
    using (Graphics g = mInkOverlay.AttachedControl.CreateGraphics())
    {
        mInkOverlay.Renderer.PixelToInkSpace(g, ref ptLeft);
    }

    // Create a Strokes object to hold strokes to be deleted
    Strokes strokesToDelete = mInkOverlay.Ink.CreateStrokes();

    // Access to the Strokes property returns a copy of the Strokes object.
    // This copy must be implicitly (via using statement) or explicitly
    // disposed of in order to avoid a memory leak.
    using (Strokes currentStrokes = mInkOverlay.Ink.Strokes)
    {
        foreach (Stroke S in currentStrokes)
        {
            foreach (Point strokePoint in S.GetPoints())
            {
                if (strokePoint.X < ptLeft.X)
                {
                    // Note: A particluar Stroke object might have several
                    // points to the left of ptLeft.X - Therefore, the
                    // following statement will be executed multiple times.
                    // Even so, the Add method will not add the same stroke twice. 
                    strokesToDelete.Add(S);
                }
            }
        }
    }

    if (strokesToDelete.Count > 0)
    {
        mInkOverlay.Ink.DeleteStrokes(strokesToDelete);
        mInkOverlay.AttachedControl.Invalidate();
    }
    strokesToDelete.Dispose();
}