private void RenderOrbit(Orbit orbit, float origin, float scale, System.Drawing.Graphics graphics, SolidBrush brush, int number = 0)
{
if (orbit == null)
{
return;
}
if (orbit.Orbiters != null)
{
// Check each orbiting object.
foreach (var orbiter in orbit.Orbiters)
{
var localOrigin = origin;
// We can only really draw something useful if we have a radius...
if (orbiter.OrbitRadius != null)
{
// Figure out max radius of children.
var maxOrbit = scale * GetMaxRadius(orbiter.Moons);
// Draw actual stuff at max bounds.
localOrigin += orbiter.OrbitRadius.High * scale;
var orbiterFactory = FactoryManager.GetFactory(orbiter.Name) as PlanetFactory;
if (orbiterFactory != null)
{
brush.Color = System.Drawing.Color.FromArgb(150, orbiterFactory.SurfaceTint.R,
orbiterFactory.SurfaceTint.G,
orbiterFactory.SurfaceTint.B);
if (orbiterFactory.Radius != null)
{
var diameter = orbiterFactory.Radius.Low * scale * 2;
graphics.FillEllipse(brush, localOrigin - diameter / 2f, pbPreview.Image.Height / 2f - diameter / 2f, diameter, diameter);
diameter = orbiterFactory.Radius.High * scale * 2;
graphics.FillEllipse(brush, localOrigin - diameter / 2f, pbPreview.Image.Height / 2f - diameter / 2f, diameter, diameter);
maxOrbit = Math.Max(maxOrbit, orbiterFactory.Radius.High * scale);
}
}
// Half the interval of variance we have for our radius.
var halfVariance = scale * (orbiter.OrbitRadius.High - orbiter.OrbitRadius.Low) / 2f;
// Add it to the max orbit to get the overall maximum possible
// when rendering a circle with its center in the middle of the
// variance interval. (and times two for width/height)
maxOrbit = (maxOrbit + halfVariance) * 2;
// Show the indicator of the maximum bounds for this orbiter.
brush.Color = System.Drawing.Color.FromArgb(20, 255, 165, 0);
graphics.FillEllipse(brush, origin + scale * orbiter.OrbitRadius.Low + halfVariance - maxOrbit / 2f, pbPreview.Image.Height / 2f - maxOrbit / 2f, maxOrbit, maxOrbit);
// Draw own orbit.
var color = OrbitColors[number % OrbitColors.Length];
using (var p = new Pen(System.Drawing.Color.FromArgb(210, color.R, color.G, color.B)))
{
float orbitX, orbitY;
var eccentricity = orbiter.Eccentricity.Low;
Orbiter.ComputeRadii(orbiter.OrbitRadius.High * scale, eccentricity, out orbitX, out orbitY);
graphics.DrawEllipse(p, origin - orbitX + orbitX * eccentricity, pbPreview.Image.Height / 2f - orbitY, orbitX * 2, orbitY * 2);
p.Color = System.Drawing.Color.FromArgb(110, color.R, color.G, color.B);
eccentricity = orbiter.Eccentricity.High;
Orbiter.ComputeRadii(orbiter.OrbitRadius.Low * scale, eccentricity, out orbitX, out orbitY);
graphics.DrawEllipse(p, origin - orbitX + orbitX * eccentricity, pbPreview.Image.Height / 2f - orbitY, orbitX * 2, orbitY * 2);
}
}
// Render children.
RenderOrbit(orbiter.Moons, localOrigin, scale, graphics, brush, ++number);
}
}
}