public void Render(RenderTarget target)
{
Direct2DFactory factory = target.GetFactory();
Color red = Color.FromRGB(128, 64, 64);
Color white = Color.FromRGB(255, 255, 255);
foreach (var star in _stars)
{
Vector4 location = star.Location;
Nullable <PointF> locN = Project(location);
if (locN != null)
{
location = location * Transform;
PointF locV = locN.Value;
double r = Math.Sqrt(location.X * location.X + location.Y * location.Y + (location.Z - PointOfView) * (location.Z - PointOfView));
double rv = Math.Sqrt(locV.X * locV.X + locV.Y * locV.Y + PointOfView * PointOfView);
double k = (rv / r);
k = k > 1 ? 1 : (k < 0 ? 0 : k);
float radius = (float)(star.Radius * rv / r);
if (radius > 0.5f)
{
if (locV.X > 0 && locV.X < ViewPortSize.Width && locV.Y > 0 && locV.Y < ViewPortSize.Height)
{
using (EllipseGeometry ellipse = factory.CreateEllipseGeometry(new Ellipse(locV, radius, radius)))
{
float hue = (float)k;
Vector4 color = new Vector4((hue + 0.45f) % 1, 1f, 0.5f, 1);
Color rgb = XMath.ColorHslToRgb(color);
Color w = white.AdjustBrightness((float)Math.Sqrt(k));
rgb = Color.Lerp(w, rgb, (float)k);
if (radius > 3)
{
Color rgb2 = rgb.AdjustBrightness(0.2f);
using (GradientStopCollection coll = target.CreateGradientStopCollection(new GradientStop[] { new GradientStop(0, rgb), new GradientStop(1, rgb2) }))
{
using (Brush brush = target.CreateRadialGradientBrush(new RadialGradientBrushProperties(locV, new PointF(radius / 22f, -radius / 2f), radius, radius),
new BrushProperties(1, Matrix3x2.Identity), coll))
{
target.FillGeometry(brush, ellipse);
}
}
}
else
{
using (SolidColorBrush brush = target.CreateSolidColorBrush(rgb))
{
target.FillGeometry(brush, ellipse);
}
}
}
}
}
}
}
}