public void DrawVector(
Point3D point,
Vector3D vector,
double length = 0.5,
Color?color = null
)
{
if (MathHelpers.AlmostEqual(vector.Length, 0, double.Epsilon))
{
return;
}
vector.Normalize();
var target = point + length * vector;
var vectorColor = color ?? Colors.Red;
FinishChain();
Connect(point, vectorColor);
Connect(target, vectorColor);
FinishChain();
}
protected int?FindCorner(
double u,
double v,
double threshold = double.Epsilon
)
{
var uEquals0 = MathHelpers.AlmostEqual(u, 0, threshold);
var uEquals1 = MathHelpers.AlmostEqual(u, 1, threshold);
var vEquals0 = MathHelpers.AlmostEqual(v, 0, threshold);
var vEquals1 = MathHelpers.AlmostEqual(v, 1, threshold);
if (uEquals0)
{
if (vEquals0)
{
return(0);
}
if (vEquals1)
{
return(1);
}
}
if (uEquals1)
{
if (vEquals0)
{
return(2);
}
if (vEquals1)
{
return(3);
}
}
return(null);
}
