[WPF]모눈종이 그리기

==== 방법 2-2: WinForm을 이용하여 순수 Bitmap 그래픽으로 렌더링 ====

[DllImport("gdi32.dll")]
private static extern bool DeleteObject(IntPtr hObject);

private void DrawBitmap()
{
    int size = 10;
    DateTime dt1 = DateTime.Now;

    System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(size * 250, size * 200);
    System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);

    int x1 = 0;
    int y1 = 0;

    System.Drawing.Pen pen = new System.Drawing.Pen(System.Drawing.Brushes.Black);
    for (int i = 0; i < 50000; i++)
    {
        x1 = (i % 250) * size;
        y1 = (i / 250) * size;

        g.DrawRectangle(pen, new System.Drawing.Rectangle(x1, y1, size, size));
    }

    IntPtr hBitmap = bitmap.GetHbitmap();

    try
    {
        BitmapSource bitmapSource =
        System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap,
            IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());

        this.image2.Source = bitmapSource;
    }
    finally
    {
        DeleteObject(hBitmap);
    }

    DateTime dt2 = DateTime.Now;
    System.Diagnostics.Trace.WriteLine("DrawVisual == " + dt2.Subtract(dt1).TotalMilliseconds.ToString());
}        

 

---

==== 방법 2-1: Bitmap 그래픽으로 렌더링 ====

<ScrollViewer HorizontalScrollBarVisibility="Auto" Grid.Column="1" x:Name="scrollViewer1" >
    <Image Name="image1" Stretch="None" />
</ScrollViewer>

private void DrawVisual()
{
    DrawingVisual dv = new DrawingVisual();

    int size = 10;

    DateTime dt1 = DateTime.Now;

    DrawingContext dc = dv.RenderOpen();
    Pen pen = new Pen(Brushes.Black, 1.0);

    Random rand = new Random();

    double x1 = 0;
    double y1 = 0;

    for (int i = 0; i < 50000; i++)
    {
        x1 = (i % 250) * size;
        y1 = (i / 250) * size;

        dc.DrawRectangle(null, pen, new Rect(x1, y1, size, size));
    }

    dc.Close();

    RenderTargetBitmap rtb = new RenderTargetBitmap(size * 250, size * 200, 96, 96, PixelFormats.Pbgra32);
    rtb.Render(dv);
    image1.Source = rtb;

    DateTime dt2 = DateTime.Now;
    System.Diagnostics.Trace.WriteLine("DrawVisual == " + dt2.Subtract(dt1).TotalMilliseconds.ToString());
}

---

==== 방법 3: SnapsToDevicePixels 효과를 얻기 위해 GuidelineSet을 적용 ====

private void DrawVisual2(int size, int widthCount, int heightCount)
{
    DrawingVisual dv = new DrawingVisual();

    Matrix m = PresentationSource.FromVisual(this)
        .CompositionTarget.TransformToDevice;
    double dpiFactor = 1 / m.M11;

    DrawingContext dc = dv.RenderOpen();
    Pen pen = new Pen(Brushes.Black, 1 * dpiFactor);
    pen.Freeze();

    Rect rect = new Rect(0, 0, size * widthCount, size * heightCount);

    double halfPenWidth = pen.Thickness / 2;

    GuidelineSet guidelines = new GuidelineSet();
    guidelines.GuidelinesX.Add(rect.Left + halfPenWidth);
    guidelines.GuidelinesX.Add(rect.Right + halfPenWidth);
    guidelines.GuidelinesY.Add(rect.Top + halfPenWidth);
    guidelines.GuidelinesY.Add(rect.Bottom + halfPenWidth);

    dc.PushGuidelineSet(guidelines);

    ...[생략]...

    dc.Pop();
    dc.Close();

    RenderTargetBitmap rtb = new RenderTargetBitmap(size * widthCount, size * heightCount, 96, 96, PixelFormats.Pbgra32);

    rtb.Render(dv);
    rtb.Freeze();
    image3.Source = rtb;
}

 

WpfApplication1.zip

0.08MB

 

 

.NET Framework: 279. WPF - 그리기 성능 및 Blurring 문제