/// <summary>
/// Draws an ovoid: a closed Catmull-Rom spline.
/// </summary>
/// <param name="pts">Control Points</param>
/// <param name="fillStr">Fill color</param>
/// <param name="outlineStr">Outline color</param>
public void DrawOvoid(String fillStr, String outlineStr, Path pts )
{
int numPts = pts.Count();
Path final = new Path();
for (int i = 0; i < numPts; i++)
{
Point2D P0 = pts[(i - 1 + numPts) % numPts];
Point2D P1 = pts[i];
Point2D P2 = pts[(i + 1) % numPts];
Point2D P3 = pts[(i + 2) % numPts];
for (int j = 0; j < resolution; j++)
{
double t = (double)j / resolution;
final.AddPt( 0.5 * ((2.0 * P1) +
(-P0 + P2) * t +
(2 * P0 - 5 * P1 + 4 * P2 - P3) * t * t +
(-P0 + 3 * P1 - 3 * P2 + P3) * t * t * t) );
}
}
DrawPoly(fillStr, outlineStr, final);
}
/// <summary>
/// Draws a closed form with N splines
/// The last point of spline N should be the same as the first point of spline N+1
/// </summary>
/// <param name="splines">The control points for the top spline</param>
/// <param name="bottom">The control points for the top spline</param>
/// <param name="fillStr">Color to fill the figure</param>
/// <param name="outlineStr">Color to outline the figure</param>
public void DrawPaths( String fillStr, String outlineStr, params Path[] splines)
{
Path final = new Path();
foreach (Path spline in splines)
{
for (int i = 0; i < spline.Count() - 1; i++)
{
Point2D P0 = (i == 0) ? spline[0] + spline[0] - spline[1] : spline[i - 1];
Point2D P1 = spline[i];
Point2D P2 = spline[i + 1];
Point2D P3 = (i == spline.Count() - 2) ? spline[i + 1] + spline[i + 1] - spline[i] : spline[i + 2];
for (int j = 0; j < resolution; j++)
{
double t = (double)j / resolution;
final.AddPt( 0.5 * ((2.0 * P1) +
(-P0 + P2) * t +
(2 * P0 - 5 * P1 + 4 * P2 - P3) * t * t +
(-P0 + 3 * P1 - 3 * P2 + P3) * t * t * t) );
}
}
}
DrawPoly(fillStr, outlineStr, final );
}