private void CreateRadiusHoles(out float pivotY)
{
// top hole is the origin point
// pivot point Y is the bottom hole
// The tip of the jig is pivotY beyond the bottom hole
var topHole = Circles.CutCircle(FastenerDiameter, 0, 0);
var smallestRadius = radii.Min();
const double originToSmallestLength = 50;
var angleAlpha = Math.Asin(originToSmallestLength / (2 * smallestRadius)) * 2; // radians
var angleBeta = Math.PI / 2 - angleAlpha;
var h = smallestRadius / Math.Cos(angleAlpha);
var x = h - smallestRadius;
pivotY = (float)(x * Math.Tan(angleBeta));
var bottomHole = topHole.CreateReference(0, Constants.JigHoleSpacing);
foreach (var radius in radii)
{
var d = Math.Sqrt(Math.Pow(pivotY, 2) + Math.Pow(radius, 2));
var angleC = Math.Asin(radius / d);
var angleR = Math.PI - 2 * angleC;
Debug.WriteLine($"r: {DegreeTrig.Degrees(angleR)}");
// Finally we can make a stupid circle. Start it at 0,0 and rotate it R around the pivot-Y point.
var hole = Circles.CutCircle(FastenerDiameter, 0, 0);
hole.Transforms.Add(new SvgRotate(DegreeTrig.Degrees(-angleR), 0, Constants.JigHoleSpacing.Px()));
Children.Add(hole);
}
Children.Add(topHole);
Children.Add(bottomHole);
}
