void Render()
{
if (resized)
{
Resize();
resized = false;
}
d2dDeviceContext.BeginDraw();
d2dDeviceContext.Clear(Color4.White);
d2dDeviceContext.PushAxisAlignedClip(new RectangleF(5, 5, Child.Width - 10, Child.Height - 10), AntialiasMode.Aliased);
d2dDeviceContext.Transform = Matrix3x2.Translation(Child.Width / 2f / Scale + Translation.X, Child.Height / 2f / Scale + Translation.Y) * Matrix3x2.Scaling(Scale);
d2dDeviceContext.AntialiasMode = AntialiasMode.Aliased;
d2dDeviceContext.DrawLine(new Vector2(0, int.MinValue), new Vector2(0, int.MaxValue), RasterDrawBrush, 1 / Scale);
d2dDeviceContext.DrawLine(new Vector2(int.MinValue, 0), new Vector2(int.MaxValue, 0), RasterDrawBrush, 1 / Scale);
d2dDeviceContext.AntialiasMode = AntialiasMode.PerPrimitive;
RenderGeometry();
d2dDeviceContext.Transform = Matrix3x2.Identity;
d2dDeviceContext.PopAxisAlignedClip();
d2dDeviceContext.EndDraw();
swapChain.Present(0, PresentFlags.None);
}
public void BeginDraw(Windows.Foundation.Rect updateRect)
{
// Express target area as a native RECT type.
var updateRectNative = new Rectangle
{
Left = (int)updateRect.Left,
Top = (int)updateRect.Top,
Right = (int)updateRect.Right,
Bottom = (int)updateRect.Bottom
};
// Query for ISurfaceImageSourceNative interface.
using (var sisNative = ComObject.QueryInterface <ISurfaceImageSourceNative>(this))
{
// Begin drawing - returns a target surface and an offset to use as the top left origin when drawing.
try
{
RawPoint offset;
using (var surface = sisNative.BeginDraw(updateRectNative, out offset))
{
// Create render target.
using (var bitmap = new Bitmap1(d2dContext, surface))
{
// Set context's render target.
d2dContext.Target = bitmap;
}
// Begin drawing using D2D context.
d2dContext.BeginDraw();
// Apply a clip and transform to constrain updates to the target update area.
// This is required to ensure coordinates within the target surface remain
// consistent by taking into account the offset returned by BeginDraw, and
// can also improve performance by optimizing the area that is drawn by D2D.
// Apps should always account for the offset output parameter returned by
// BeginDraw, since it may not match the passed updateRect input parameter's location.
d2dContext.PushAxisAlignedClip(
new RectangleF(
(offset.X),
(offset.Y),
(offset.X + (float)updateRect.Width),
(offset.Y + (float)updateRect.Height)
),
AntialiasMode.Aliased
);
d2dContext.Transform = Matrix3x2.Translation(offset.X, offset.Y);
}
}
catch (SharpDXException ex)
{
if (ex.ResultCode == SharpDX.DXGI.ResultCode.DeviceRemoved ||
ex.ResultCode == SharpDX.DXGI.ResultCode.DeviceReset)
{
// If the device has been removed or reset, attempt to recreate it and continue drawing.
CreateDeviceResources();
BeginDraw(updateRect);
}
else
{
throw;
}
}
}
}
