//points = List of points making up the shapes perimeter is order
private static IEnumerable <DgLine> ShapeSpin(List <DgPoint> points, float scale = 0.03f, bool[] printLine = null)
{
//used to only show some of the lines. Only one side for example.
//Iterate through the values in the array, printing them if true.
//If doing a triangle {true, true, false} won't print one side.
if (printLine == null)
{
printLine = new[] { true }
}
;
var printLineIndex = 0;
var lines = new List <DgLine>();
var pointQueue = new Queue <DgPoint>();
//The algorithm misses the line connecting the first and last point of the perimieter, so add it.
lines.Add(new DgLine(points[0], points[points.Count - 1]));
foreach (var point in points)
{
pointQueue.Enqueue(point);
}
while (true)
{
var first = pointQueue.Dequeue();
var second = pointQueue.Peek();
var line = new DgLine(first, second);
printLineIndex = (printLineIndex + 1) % printLine.Length;
if (printLine[printLineIndex])
{
lines.Add(line);
}
pointQueue.Enqueue(line.Fraction(scale));
if (Length(line) < 1)
{
break;
}
}
return(lines);
}
private static double Length(DgLine l)
{
return(Math.Sqrt((l.P1.X - l.P2.X) * (l.P1.X - l.P2.X) + (l.P1.Y - l.P2.Y) * (l.P1.Y - l.P2.Y)));
}