public IEnumerable <PointF> GetSpiralPoints()
{
for (float theta = 0; ; theta += deltaAngle)
{
var r = thickness * theta;
float x, y;
(x, y) = PointConverter.TransformPolarToCartesian(r, theta);
x += center.X;
y += center.Y;
yield return(new PointF(x, y));
}
}
private bool TryFindPointAtSpiralOneSpinAgo(PointF currentSpinPoint, float a, out PointF previousSpinPoint)
{
var(r, theta) =
PointConverter.TransformCartesianToPolar(currentSpinPoint.X - center.X, currentSpinPoint.Y - center.Y);
theta -= (float)(2 * Math.PI * a);
if (theta < 0)
{
previousSpinPoint = new PointF(0, 0);
return(false);
}
r = theta * a;
var(x, y) = PointConverter.TransformPolarToCartesian(r, theta);
previousSpinPoint = new PointF(x + center.X, y + center.Y);
return(true);
}