public void FillGradientEllipse(float x, float y, float width, float height, System.Drawing.Color[] colors)
{
// Create the radial gradient brush properties object
SharpDX.Direct2D1.RadialGradientBrushProperties radProp = new SharpDX.Direct2D1.RadialGradientBrushProperties
{
RadiusX = width,
RadiusY = height,
Center = new SharpDX.Mathematics.Interop.RawVector2(x, y)
};
// Create a list of gratiend stops
List <SharpDX.Direct2D1.GradientStop> stops = new List <SharpDX.Direct2D1.GradientStop>();
// TODO: Create a color collection that also stores the color position
// Auto calulate color position
for (int i = 0; i < colors.Length; ++i)
{
SharpDX.Direct2D1.GradientStop stop = new SharpDX.Direct2D1.GradientStop
{
Color = ToColor(colors[i]),
Position = (float)(1.0 / colors.Length) * (i + 1)
};
stops.Add(stop);
}
SharpDX.Direct2D1.GradientStopCollection radStops = new SharpDX.Direct2D1.GradientStopCollection(d2dRenderTarget, stops.ToArray());
SharpDX.Direct2D1.RadialGradientBrush rgBrush = new SharpDX.Direct2D1.RadialGradientBrush(d2dRenderTarget, ref radProp, radStops);
SharpDX.Mathematics.Interop.RawVector2 center = new SharpDX.Mathematics.Interop.RawVector2(x, y);
SharpDX.Direct2D1.Ellipse ellipse = new SharpDX.Direct2D1.Ellipse(center, width, height);
d2dRenderTarget.FillEllipse(ellipse, rgBrush);
radStops.Dispose();
rgBrush.Dispose();
}
protected override void OnRender(ChartControl chartControl, ChartScale chartScale)
{
// Call base OnRender() method to paint defined Plots.
base.OnRender(chartControl, chartScale);
// Store previous AA mode
SharpDX.Direct2D1.AntialiasMode oldAntialiasMode = RenderTarget.AntialiasMode;
RenderTarget.AntialiasMode = SharpDX.Direct2D1.AntialiasMode.PerPrimitive;
// Create Linear Graient Brush Properties
SharpDX.Direct2D1.RadialGradientBrushProperties rgbProps = new SharpDX.Direct2D1.RadialGradientBrushProperties();
rgbProps.Center = new SharpDX.Vector2(ChartPanel.W / 2, ChartPanel.H / 2);
rgbProps.RadiusX = ChartPanel.W / 2;
rgbProps.RadiusY = ChartPanel.W / 2;
// Create Gradient Stop1 for the Gradient Stop Collection
SharpDX.Direct2D1.GradientStop stop1;
stop1.Color = SharpDX.Color.DarkSalmon;
stop1.Position = 0;
// Create Gradient Stop2 for the Gradient Stop Collection
SharpDX.Direct2D1.GradientStop stop2;
stop2.Color = SharpDX.Color.DarkGreen;
stop2.Position = 1;
// Create GradientStop array for GradientStopCollection
SharpDX.Direct2D1.GradientStop[] rgbStops = new SharpDX.Direct2D1.GradientStop[] { stop1, stop2 };
// Make our GradientStopCollection
SharpDX.Direct2D1.GradientStopCollection rgbSGC = new SharpDX.Direct2D1.GradientStopCollection(RenderTarget, rgbStops);
// Finally, create the LinearGradientBrush
SharpDX.Direct2D1.RadialGradientBrush rgBrush = new SharpDX.Direct2D1.RadialGradientBrush(RenderTarget, rgbProps, rgbSGC);
// Render Draw Method here
RenderTarget.FillEllipse(new SharpDX.Direct2D1.Ellipse(new SharpDX.Vector2(ChartPanel.W / 2, ChartPanel.H / 2), ChartPanel.W / 2, ChartPanel.H / 2), rgBrush);
// This exmaple describes implementation in OnRender(), for more effieceny, dipose and recreate class level RenderTarget dependant objects in OnRederTargetStateChange()
rgbSGC.Dispose();
rgBrush.Dispose();
// Reset AA mode.
RenderTarget.AntialiasMode = oldAntialiasMode;
}