/// <summary>
/// draw the path to a target
/// </summary>
/// <param name="target">the draw target</param>
/// <param name="strokeSize">the stroke size, 0-1</param>
public void DrawTo(IDrawTarget target, float strokeSize = 1)
{
// set the color and stroke
target.SetPrimaryColor(color);
target.SetStroke(strokeSize);
// draw the path
target.DrawPoly(Vertices);
}
/// <summary>
/// Draw a list of dots by drawing polygons
/// </summary>
/// <param name="target">draw target</param>
/// <param name="dots">the dot list</param>
/// <param name="totalDots">the total number of dots (progress reporting)</param>
/// <param name="dotsDrawn">the total number of dots drawn (progress reporting)</param>
/// <returns>the number of dots drawn</returns>
private int DrawUsingPolys(IDrawTarget target, List <PointF> dots, double totalDots, double dotsDrawn)
{
// sort dots by x, then y
dots.Sort((d1, d2) =>
{
// Y 0 ==> Y 1
if (d1.X.Equals(d2.X))
{
return(d1.Y.CompareTo(d2.Y));
}
// X 0 ==> X 1
return(d1.X.CompareTo(d2.X));
});
// get the size of one dot
// keep the sizes squared to safe (a few) sqrts
float dotW = 1 / mapSize.Width;
float dotH = 1 / mapSize.Height;
float oneDotDiagonally = MathF.Abs((dotW * dotW) + (dotH * dotH));
// enumerate all dots, top to bottom and left to right
List <PointF> poly = new List <PointF>();
foreach (PointF dot in dots)
{
// first dot requires special handling...
if (poly.Count <= 0)
{
poly.Add(dot);
continue;
}
// get distance to last dot
float dist = DotDistanceSq(dot, poly.Last());
// if the dot is less than 1 dot (diagonally) away from the last, just add it to the polygon
// otherwise, draw the polygon, and start a new one
if (MathF.Abs(dist) > oneDotDiagonally)
{
//remove all dots in the poly that are in a direct line to another dot in the poly
//such that they are not needed for drawing
PointF l = poly[0];
for (int i = 1; i < (poly.Count - 1); i++)
{
PointF c = poly[i];
if (MathF.Abs(c.X - l.X) < dotW ||
MathF.Abs(c.Y - l.Y) < dotH)
{
poly.RemoveAt(i);
continue;
}
l = c;
}
// draw and reset poly
target.DrawPoly(poly.ToArray());
poly.Clear();
// report progress
ReportProgress(dotsDrawn / totalDots);
}
// add dot to poly
poly.Add(dot);
dotsDrawn++;
}
// draw the last polygon
target.DrawPoly(poly.ToArray());
return(dots.Count);
}