private void DrawLight(ILight l)
{
if (l is PointLight)
{
PointLight pl = l as PointLight;
Vector2 center = new Vector2(pl.Position.X, pl.Position.Z);
double crossSize = 500.0 / areaSize;
Vector2 pc = VectorToPixel(center);
g.DrawLine(Pens.Black, pc.X - crossSize, pc.Y - crossSize, pc.X + crossSize, pc.Y + crossSize);
g.DrawLine(Pens.Black, pc.X - crossSize, pc.Y + crossSize, pc.X + crossSize, pc.Y - crossSize);
Rectangle rect = new Rectangle((int)(pc.X - crossSize * 0.6), (int)(pc.Y - crossSize * 0.6), (int)(crossSize * 1.2), (int)(crossSize * 1.2));
g.FillEllipse(new SolidBrush(pl.Color.ToColor()), rect);
g.DrawEllipse(Pens.Black, rect);
}
if (l is AreaLight)
{
AreaLight al = l as AreaLight;
Vector2 center = new Vector2(al.Position.X, al.Position.Z);
double crossSize = 500.0 / areaSize;
Vector2 pc = VectorToPixel(center);
g.DrawLine(Pens.Black, pc.X, pc.Y - crossSize, pc.X, pc.Y + crossSize);
g.DrawLine(Pens.Black, pc.X - crossSize, pc.Y, pc.X + crossSize, pc.Y);
Rectangle rect = new Rectangle((int)(pc.X - crossSize * 0.6), (int)(pc.Y - crossSize * 0.6), (int)(crossSize * 1.2), (int)(crossSize * 1.2));
g.FillEllipse(new SolidBrush(al.Color.ToColor()), rect);
g.DrawEllipse(Pens.Black, rect);
}
if (l is SpotLight)
{
SpotLight sl = l as SpotLight;
Vector2 center = new Vector2(sl.Position.X, sl.Position.Z);
double crossSize = 500.0 / areaSize;
Vector2 pc = VectorToPixel(center);
g.DrawLine(Pens.Black, pc.X - crossSize, pc.Y - crossSize, pc.X + crossSize, pc.Y + crossSize);
g.DrawLine(Pens.Black, pc.X - crossSize, pc.Y + crossSize, pc.X + crossSize, pc.Y - crossSize);
Rectangle rect = new Rectangle((int)(pc.X - crossSize * 0.6), (int)(pc.Y - crossSize * 0.6), (int)(crossSize * 1.2), (int)(crossSize * 1.2));
g.FillEllipse(new SolidBrush(sl.Color.ToColor()), rect);
g.DrawEllipse(Pens.Black, rect);
Vector2 dir = new Vector2(sl.Direction.X, sl.Direction.Z);
if (dir.Length == 0.0)
return;
dir.Normalize();
Vector2 orth = new Vector2(-dir.Y, dir.X) * Math.Tan(sl.Angle.ToRadians());
Vector2 left = dir - orth;
Vector2 right = dir + orth;
DrawLine(Pens.Blue, center, center + left * 50.0);
DrawLine(Pens.Blue, center, center + right * 50.0);
}
}
private bool IsLightVisible(Vector3 point, ILight light)
{
if (light is PointLight)
{
PointLight plight = light as PointLight;
return !PointObstructed(point, plight.Position);
}
if (light is SpotLight)
{
SpotLight slight = light as SpotLight;
if (!slight.PointLighted(point))
return false;
return !PointObstructed(point, slight.Position);
}
return false;
}
