public void AngleBetween()
{
const double epsilon = 0.0001;
const double angle = 63.435; // polar angle of (1,2)
Assert.AreEqual(0, pointD.AngleBetween(pointD));
Assert.AreEqual(0, PointD.Empty.AngleBetween(pointD, pointD));
Assert.AreEqual(Math.PI, PointD.Empty.AngleBetween(new PointD(1, 0), new PointD(-2, 0)));
Assert.AreEqual(-angle, pointD.AngleBetween(new PointD(2, 0)) * Angle.RadiansToDegrees, epsilon);
Assert.AreEqual(90.0 - angle, pointD.AngleBetween(new PointD(0, 2)) * Angle.RadiansToDegrees, epsilon);
Assert.AreEqual(0, pointF.AngleBetween(pointF));
Assert.AreEqual(0, PointF.Empty.AngleBetween(pointF, pointF));
Assert.AreEqual(Math.PI, PointF.Empty.AngleBetween(new PointF(1, 0), new PointF(-2, 0)));
Assert.AreEqual(-angle, pointF.AngleBetween(new PointF(2, 0)) * Angle.RadiansToDegrees, epsilon);
Assert.AreEqual(90.0 - angle, pointF.AngleBetween(new PointF(0, 2)) * Angle.RadiansToDegrees, epsilon);
Assert.AreEqual(0, pointI.AngleBetween(pointI));
Assert.AreEqual(0, PointI.Empty.AngleBetween(pointI, pointI));
Assert.AreEqual(Math.PI, PointI.Empty.AngleBetween(new PointI(1, 0), new PointI(-2, 0)));
Assert.AreEqual(-angle, pointI.AngleBetween(new PointI(2, 0)) * Angle.RadiansToDegrees, epsilon);
Assert.AreEqual(90.0 - angle, pointI.AngleBetween(new PointI(0, 2)) * Angle.RadiansToDegrees, epsilon);
}
/// <summary>
/// Creates the <see cref="NodeArc"/> for the specified target node.</summary>
/// <param name="target">
/// The <see cref="Graph"/> node whose <see cref="NodeArc"/> to create.</param>
/// <returns>
/// A new <see cref="NodeArc"/> for the specified <paramref name="target"/> node.</returns>
private NodeArc CreateNodeArc(T target)
{
// compute world coordinates of target node
PointD targetWorld = Graph.GetWorldLocation(target);
PointD[] region = Graph.GetWorldRegion(target);
// alpha is angle from source to center of target node
LineD line = new LineD(_sourceWorld, targetWorld);
double alpha = line.Angle;
// use central location with 1° arc if no region available
if (region == null)
{
const double arc = Angle.DegreesToRadians;
alpha -= arc / 2;
if (alpha <= -Math.PI)
{
alpha += 2 * Math.PI;
}
return(new NodeArc(alpha, arc, line.Length));
}
double distance = Double.MaxValue;
double minBeta = 0, maxBeta = 0;
foreach (PointD vertex in region)
{
// find extreme relative angles for any region vertex
double beta = _sourceWorld.AngleBetween(targetWorld, vertex);
if (beta <= minBeta)
{
minBeta = beta;
}
else if (beta >= maxBeta)
{
maxBeta = beta;
}
// find smallest distance for any region vertex
double vertexDistance = (vertex - _sourceWorld).Length;
if (distance > vertexDistance)
{
distance = vertexDistance;
}
}
return(new NodeArc(alpha + minBeta, maxBeta - minBeta, distance));
}
public void Rotate(decimal sx, decimal sy, List <PointShapeViewModel> points, ref decimal rotateAngle)
{
var centerX = Bounds.CenterX;
var centerY = Bounds.CenterY;
var p0 = new PointD(centerX, centerY);
var p1 = new PointD(sx, sy);
var angle = p0.AngleBetween(p1) - 270m;
var delta = angle - rotateAngle;
var radians = delta * ((decimal)Math.PI / 180m);
var matrix = MatrixD.Rotation(radians, centerX, centerY);
TransformPoints(ref matrix, points);
rotateAngle = angle;
Update();
}
