コード例 #1
0
        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);
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }