public static ExpVector rotateDir2d(ExpVector rv, Exp angle)
{
var cos = Exp.Cos(angle);
var sin = Exp.Sin(angle);
return(new ExpVector(
cos * rv.x - sin * rv.y,
sin * rv.x + cos * rv.y,
rv.z
));
}
public static ExpVector RotateAround(ExpVector point, ExpVector axis, ExpVector origin, Exp angle)
{
var a = axis.Normalized();
var c = Exp.Cos(angle);
var s = Exp.Sin(angle);
var u = new ExpVector(c + (1.0 - c) * a.x * a.x, (1.0 - c) * a.y * a.x + s * a.z, (1 - c) * a.z * a.x - s * a.y);
var v = new ExpVector((1.0 - c) * a.x * a.y - s * a.z, c + (1.0 - c) * a.y * a.y, (1.0 - c) * a.z * a.y + s * a.x);
var n = new ExpVector((1.0 - c) * a.x * a.z + s * a.y, (1.0 - c) * a.y * a.z - s * a.x, c + (1 - c) * a.z * a.z);
var p = point - origin;
return(p.x * u + p.y * v + p.z * n + origin);
}
public override ExpVector TangentAt(Exp t)
{
var angle = GetAngleExp();
var cos = Exp.Cos(angle * t + Math.PI / 2);
var sin = Exp.Sin(angle * t + Math.PI / 2);
var rv = p0.exp - c.exp;
return(new ExpVector(
cos * rv.x - sin * rv.y,
sin * rv.x + cos * rv.y,
0.0
));
}
/*
* protected override double OnSelect(Vector3 mouse, Camera camera, Matrix4x4 tf) {
* float angle = GetAngle() * Mathf.Rad2Deg;
* Debug.Log(angle);
* var cp = c.pos;
* var rv = p0.pos - cp;
* int subdiv = (int)Math.Ceiling(angle / 30);
* var vz = Vector3.forward;
* var rot = Quaternion.AngleAxis(angle / (subdiv - 1), vz);
* var prev = Vector3.zero;
* double min = -1;
* for(int i = 0; i < subdiv; i++) {
* var pos = camera.WorldToScreenPoint(tf.MultiplyPoint(rv + cp));
* if(i > 0) {
* var dist = GeomUtils.DistancePointSegment2D(mouse, prev, pos);
* if(min > 0 && dist > min) continue;
* min = dist;
* }
* prev = pos;
* rv = rot * rv;
* }
* return min;
* }
*/
public override ExpVector PointOn(Exp t)
{
var angle = GetAngleExp();
var cos = Exp.Cos(angle * t);
var sin = Exp.Sin(angle * t);
var rv = p0.exp - c.exp;
return(c.exp + new ExpVector(
cos * rv.x - sin * rv.y,
sin * rv.x + cos * rv.y,
0.0
));
}
public override ExpVector TangentAt(Exp t)
{
var angle = t * 2.0 * Math.PI;
return(new ExpVector(-Exp.Sin(angle), Exp.Cos(angle), 0.0));
}
public override ExpVector PointOn(Exp t)
{
var angle = t * 2.0 * Math.PI;
return(c.exp + new ExpVector(Exp.Cos(angle), Exp.Sin(angle), 0.0) * Radius());
}
public override ExpVector PointOn(Exp t)
{
var angle = t * 2.0 * Math.PI;
return(basis.TransformPosition(new ExpVector(Exp.Cos(angle) * Exp.Abs(r0), Exp.Sin(angle) * Exp.Abs(r1), 0.0)));
}
