/// <summary>
/// for use with DcRenderTarget (though it would also work with HwndRenderTarget if GDI interop was not used)
/// </summary>
/// <param name="e"></param>
protected override void OnPaint(PaintEventArgs e)
{
if (!IsInitialized || DesignMode)
{
e.Graphics.DrawString("D2DShapesControl", Font, foregroundBrush, (float)Width / 2, (float)Height / 2);
}
else
{
lock (renderSyncObject)
{
if (renderMode == RenderModes.DCRenderTarget ||
renderMode == RenderModes.BitmapRenderTargetOnPaint)
{
if (dcRenderTarget == null)
{
return;
}
CalculateFPS();
if (renderMode == RenderModes.DCRenderTarget)
{
//render scene directly to DC
dcRenderTarget.BindDC(e.Graphics.GetHdc(), new Rect(Left, Top, Right, Bottom));
RenderScene(dcRenderTarget);
e.Graphics.ReleaseHdc();
e.Graphics.DrawString(string.Format("OnPaint({0}) direct DC draw", DateTime.Now), Font, Brushes.White, 0, 2);
e.Graphics.DrawString(string.Format("OnPaint({0}) direct DC draw", DateTime.Now), Font, Brushes.Black, 1, 2);
}
else if (renderMode == RenderModes.BitmapRenderTargetOnPaint)
{
//draw bitmap cache of the shapes to DC
dcRenderTarget.BindDC(e.Graphics.GetHdc(), new Rect(Left, Top, Right, Bottom));
dcRenderTarget.BeginDraw();
dcRenderTarget.DrawBitmap(bitmapRenderTarget.Bitmap, 1.0f,
BitmapInterpolationMode.NearestNeighbor,
new RectF(0, 0, Width, Height));
dcRenderTarget.EndDraw();
e.Graphics.ReleaseHdc();
e.Graphics.DrawString(string.Format("OnPaint({0}) DC DrawBitmap", DateTime.Now), Font, Brushes.White, 0, 2);
e.Graphics.DrawString(string.Format("OnPaint({0}) DC DrawBitmap", DateTime.Now), Font, Brushes.Black, 1, 2);
}
}
}
}
}
void FontEnumComboBox_DrawItem(object sender, DrawItemEventArgs e)
{
//initialize the DC Render Target and a brush before first use
InitializeRenderTarget();
//draw the background of the combo item
e.DrawBackground();
//set section of the DC to draw on
var subRect = new Rect(
e.Bounds.Left,
e.Bounds.Top,
e.Bounds.Right,
e.Bounds.Bottom);
//bind the render target with the DC
dcRenderTarget.BindDC(e.Graphics.GetHdc(), subRect);
//draw the text using D2D/DWrite
dcRenderTarget.BeginDraw();
var fontName = (string)Items[e.Index];
//if ((e.State & DrawItemState.Selected & ~DrawItemState.NoFocusRect) != DrawItemState.None)
dcRenderTarget.DrawTextLayout(
new Point2F(5, (e.Bounds.Height - layouts[fontName].Metrics.Height) / 2),
layouts[fontName],
brush,
DrawTextOptions.Clip);
dcRenderTarget.EndDraw();
//release the DC
e.Graphics.ReleaseHdc();
//drow focus rect for a focused item
e.DrawFocusRectangle();
}