/// <summary>
/// Creates a linker texture for the given key.
/// </summary>
private static _LinkerTexture _CreateTexture(_LinkerKey Key)
{
double grabberwidth = Key.ChildBorderWidth;
double handlelength = 0.4;
double handlewidth = 0.1;
double grabbermaxangle = Math.PI / 8;
double partangle = grabbermaxangle / 2.0;
double maxheight = handlewidth / 2.0;
double innerwidth = Key.ChildRadius - grabberwidth;
double maxgrabberwidth = Key.ChildRadius - Math.Cos(grabbermaxangle) * innerwidth;
double posheight = Math.Sin(grabbermaxangle) * Key.ChildRadius;
if (posheight > maxheight)
{
maxheight = posheight;
}
Vector size = new Vector(maxgrabberwidth + handlelength, maxheight * 2.0);
double grabbercenter = -Key.ChildRadius + maxgrabberwidth;
double midcenter = 0.5 * size.Y;
Drawer dr = Drawer.Create(delegate(Vector Point)
{
Point.X *= size.X;
Point.Y *= size.Y;
Vector grabberdif = (Point - new Vector(grabbercenter, midcenter));
double grabberdis = grabberdif.Length;
double grabberang = grabberdif.Angle;
if (grabberdis < innerwidth)
{
return Color.Transparent;
}
if (grabberdis < Key.ChildRadius)
{
double angdif = Math.Abs(grabberang);
if (angdif < grabbermaxangle - partangle)
{
return Color.RGBA(0.9, 0.9, 0.9, 1.0);
}
if (angdif < grabbermaxangle)
{
return Color.RGBA(0.9, 0.9, 0.9, 0.5);
}
}
if (Math.Abs(Point.Y - midcenter) < handlewidth / 2.0)
{
double a = (Point.X - maxgrabberwidth) / handlelength;
return Color.RGBA(0.9, 0.9, 0.9, 1.0 - a * a);
}
return Color.Transparent;
});
return new _LinkerTexture()
{
Size = size,
ChildCenterOffset = grabbercenter,
Texture = Texture.Define(dr, size.X / size.Y, 0.7)
};
}
/// <summary>
/// Draws a "linker" between two linked driftoids. Driftoids and view should already be set up.
/// </summary>
public static void DrawLinker(LinkedDriftoid Parent, LinkedDriftoid Child)
{
_LinkerKey lk = new _LinkerKey()
{
ChildRadius = Child.Radius,
ChildBorderWidth = Child.BorderWidth
};
_LinkerTexture lt;
if (!_LinkerTextures.TryGetValue(lk, out lt))
{
_LinkerTextures[lk] = lt = _CreateTexture(lk);
}
Vector dif = Parent.Position - Child.Position;
Texture.Bind2D(lt.Texture.ID);
GL.PushMatrix();
GL.Translate(Child.Position.X, Child.Position.Y, 0.0);
GL.Rotate(dif.Angle * 180 / Math.PI, 0.0, 0.0, 1.0);
GL.Translate(-lt.ChildCenterOffset, 0.0, 0.0);
GL.Scale(lt.Size.X / 2.0, lt.Size.Y / 2.0, 1.0);
GL.Translate(1.0, 0.0, 0.0);
GL.Begin(BeginMode.Quads);
GL.Vertex2(-1.0f, -1.0f); GL.TexCoord2(0f, 0f);
GL.Vertex2(-1.0f, 1.0f); GL.TexCoord2(1f, 0f);
GL.Vertex2(1.0f, 1.0f); GL.TexCoord2(1f, 1f);
GL.Vertex2(1.0f, -1.0f); GL.TexCoord2(0f, 1f);
GL.End();
GL.PopMatrix();
}
