SharpDxを利用して、ラインを生成し、生成したラインを回転（アフィン変換）して描画します。

SharpDxでは、一般的に、PathGeometryでラインを生成し、生成したラインの回転（アフィン変換）にTransformedGeometryクラスを利用しますが、TransformedGeometryでは、回転後の座標が取得できません。
※どうしても変換後の座標が欲しかったので…

そこで、今回は、GraphicsPathでラインを生成し、生成したラインの回転（アフィン変換）に
Matrix.RotateAt()を利用します。GraphicsPathの場合は、変換後の座標が取得できるので、
変換後の座標から、PathGeometryを生成し、ラインの描画を行います。

２．参考ソース

以下参考ソースです。

初期処理

private void Initialize()
{
    this.Factory2D = new SDX2D.Factory();
    var properties = new SDX2D.HwndRenderTargetProperties();
    properties.Hwnd = this.Handle;
    properties.PixelSize = new SDX.Size2(this.Size.Width, this.Size.Height);
    properties.PresentOptions = SDX2D.PresentOptions.None;
    this.WinRenderTarget = new SDX2D.WindowRenderTarget(Factory2D, 
        new SDX2D.RenderTargetProperties(
            new SDX2D.PixelFormat(SDX.DXGI.Format.Unknown, SDX2D.AlphaMode.Premultiplied)), properties);
    this.WinRenderTarget.AntialiasMode = SDX2D.AntialiasMode.PerPrimitive;
    this.WinRenderTarget.TextAntialiasMode = SDX2D.TextAntialiasMode.Cleartype;

    this.BmpRenderTarget = new SDX2D.BitmapRenderTarget(this.WinRenderTarget,
        SDX2D.CompatibleRenderTargetOptions.None, new SDX.Size2F(400, 400), null, null);
    this.BackRenderTarget = new SDX2D.BitmapRenderTarget(this.WinRenderTarget,
        SDX2D.CompatibleRenderTargetOptions.None, new SDX.Size2F(200, 200), null, null);
}

private void Initialize()

{

this.Factory2D = new SDX2D.Factory();

var properties = new SDX2D.HwndRenderTargetProperties();

properties.Hwnd = this.Handle;

properties.PixelSize = new SDX.Size2(this.Size.Width, this.Size.Height);

properties.PresentOptions = SDX2D.PresentOptions.None;

this.WinRenderTarget = new SDX2D.WindowRenderTarget(Factory2D,

new SDX2D.RenderTargetProperties(

new SDX2D.PixelFormat(SDX.DXGI.Format.Unknown, SDX2D.AlphaMode.Premultiplied)), properties);

this.WinRenderTarget.AntialiasMode = SDX2D.AntialiasMode.PerPrimitive;

this.WinRenderTarget.TextAntialiasMode = SDX2D.TextAntialiasMode.Cleartype;

this.BmpRenderTarget = new SDX2D.BitmapRenderTarget(this.WinRenderTarget,

SDX2D.CompatibleRenderTargetOptions.None, new SDX.Size2F(400, 400), null, null);

this.BackRenderTarget = new SDX2D.BitmapRenderTarget(this.WinRenderTarget,

SDX2D.CompatibleRenderTargetOptions.None, new SDX.Size2F(200, 200), null, null);

}

画像の生成

GraphicsPathでラインを生成し、生成したラインを回転（アフィン変換）させて、
変換後の座標から、PathGeometryを生成し、ラインの描画を行います。

private PointF[] CreatePoints(float rotate)
{
    var path = new GraphicsPath();
    path.StartFigure();
    path.AddLine(50, 100, 150, 100);
    path.CloseFigure();
    var points1 = path.PathData.Points;

    var mat = new Matrix();
    mat.RotateAt(rotate, new PointF(100, 100));
    path.Transform(mat);
    return path.PathData.Points;
}
private SDX2D.PathGeometry CreatePathGeometry2(PointF[] points)
{
    var pathGeometry = new SDX2D.PathGeometry(this.Factory2D);
    using (SDX2D.GeometrySink geometrySink = pathGeometry.Open())
    {
        var stPoint = new SDXMath.RawVector2(points[0].X, points[0].Y);
        var edPoint = new SDXMath.RawVector2(points[1].X, points[1].Y);
        geometrySink.BeginFigure(stPoint, SDX2D.FigureBegin.Hollow);
        geometrySink.AddLines(new SDXMath.RawVector2[] { edPoint });
        geometrySink.EndFigure(SDX2D.FigureEnd.Open);
        geometrySink.Close();
    }

    return pathGeometry;
}
public void CreateImage()
{
    var brush = new SDX2D.SolidColorBrush(this.WinRenderTarget, SDX.Color.Black);
    var fontFactory = new SDX.DirectWrite.Factory();
    var textFormat = new SDXDW.TextFormat(fontFactory, "メイリオ", 8.0f);
    var textBrush = new SDX2D.SolidColorBrush(this.WinRenderTarget, SDX.Color.Red);
    this.BmpRenderTarget.BeginDraw();
    this.BmpRenderTarget.Clear(SDX.Color.LightGray);
    var rotates = new float[] { 0f, 30f, 45f, 60f, 90f,150f,300f };
    foreach (var rotate in rotates)
    {
        var points = this.CreatePoints(rotate);
        var pathGeometry = this.CreatePathGeometry2(points);
        this.BmpRenderTarget.DrawGeometry(pathGeometry, brush, 0.5f);
        this.BmpRenderTarget.DrawText(rotate.ToString(), textFormat,
            new SDX.RectangleF(points[0].X - 10, points[0].Y - 10, 20, 20), textBrush, SDX2D.DrawTextOptions.None);
    }
    this.BmpRenderTarget.EndDraw();
}

private PointF[] CreatePoints(float rotate)

{

var path = new GraphicsPath();

path.StartFigure();

path.AddLine(50, 100, 150, 100);

path.CloseFigure();

var points1 = path.PathData.Points;

var mat = new Matrix();

mat.RotateAt(rotate, new PointF(100, 100));

path.Transform(mat);

return path.PathData.Points;

}

private SDX2D.PathGeometry CreatePathGeometry2(PointF[] points)

{

var pathGeometry = new SDX2D.PathGeometry(this.Factory2D);

using (SDX2D.GeometrySink geometrySink = pathGeometry.Open())

{

var stPoint = new SDXMath.RawVector2(points[0].X, points[0].Y);

var edPoint = new SDXMath.RawVector2(points[1].X, points[1].Y);

geometrySink.BeginFigure(stPoint, SDX2D.FigureBegin.Hollow);

geometrySink.AddLines(new SDXMath.RawVector2[] { edPoint });

geometrySink.EndFigure(SDX2D.FigureEnd.Open);

geometrySink.Close();

}

return pathGeometry;

}

public void CreateImage()

{

var brush = new SDX2D.SolidColorBrush(this.WinRenderTarget, SDX.Color.Black);

var fontFactory = new SDX.DirectWrite.Factory();

var textFormat = new SDXDW.TextFormat(fontFactory, "メイリオ", 8.0f);

var textBrush = new SDX2D.SolidColorBrush(this.WinRenderTarget, SDX.Color.Red);

this.BmpRenderTarget.BeginDraw();

this.BmpRenderTarget.Clear(SDX.Color.LightGray);

var rotates = new float[] { 0f, 30f, 45f, 60f, 90f,150f,300f };

foreach (var rotate in rotates)

{

var points = this.CreatePoints(rotate);

var pathGeometry = this.CreatePathGeometry2(points);

this.BmpRenderTarget.DrawGeometry(pathGeometry, brush, 0.5f);

this.BmpRenderTarget.DrawText(rotate.ToString(), textFormat,

new SDX.RectangleF(points[0].X - 10, points[0].Y - 10, 20, 20), textBrush, SDX2D.DrawTextOptions.None);

}

this.BmpRenderTarget.EndDraw();

}

画像の表示

読み込んだ、SharpDX.Direct2D1.Bitmap型のデータを、
画像に表示するためのWinRenderTargetにドローし、画面に表示します。

private void OnPaint(object sender, PaintEventArgs e)
{
    var bitmap = this.BmpRenderTarget.Bitmap;
    var rectF = new SDX.RectangleF(0, 0, bitmap.Size.Width, bitmap.Size.Height);
    this.WinRenderTarget.BeginDraw();
    this.WinRenderTarget.Clear(SDX.Color.White);
    this.WinRenderTarget.DrawBitmap(bitmap, rectF, 1, SDX2D.BitmapInterpolationMode.NearestNeighbor, rectF);
    this.WinRenderTarget.EndDraw();
}