/// <summary>
/// Draws the given polygon.
/// </summary>
/// <param name="polygon">The polygon to render.</param>
/// <param name="color">The color to use when drawing the polygon.</param>
/// <param name="dashed">If true, the polygon will be "dashed".</param>
public void DrawPolygon(VectorPolygon polygon, Color color, bool dashed)
{
if (polygon == null)
{
throw new ArgumentNullException("polygon");
}
int step = (dashed == true) ? 2 : 1;
for (int i = 0; i < polygon.TransformedPoints.Length; i += step)
{
if (currentIndex >= vertices.Length - 2)
{
End();
Begin();
}
vertices[currentIndex].Position.X =
polygon.TransformedPoints[i % polygon.TransformedPoints.Length].X;
vertices[currentIndex].Position.Y =
polygon.TransformedPoints[i % polygon.TransformedPoints.Length].Y;
vertices[currentIndex++].Color = color;
vertices[currentIndex].Position.X =
polygon.TransformedPoints[(i + 1) %
polygon.TransformedPoints.Length].X;
vertices[currentIndex].Position.Y =
polygon.TransformedPoints[(i + 1) %
polygon.TransformedPoints.Length].Y;
vertices[currentIndex++].Color = color;
lineCount++;
}
}
/// <summary>
/// Draws the given polygon, in defined segments.
/// </summary>
/// <param name="aPolygon">The polygon to render.</param>
/// <param name="aColor">The color to use when drawing the polygon.</param>
/// <param name="aDashed">If true, the polygon will be "dashed".</param>
/// <param name="aStartSeg">Start of segment drawing.</param>
/// <param name="aEndSeg">End of segment drawing.</param>
public void DrawPolygonSegments(VectorPolygon aPolygon,
Color aColor, bool aDashed, int aStartSeg, int aEndSeg)
{
if (aPolygon == null || aEndSeg > aPolygon.TransformedPoints.Length)
{
throw new ArgumentNullException("polygon");
}
int step = (aDashed == true) ? 2 : 1;
for (int i = aStartSeg; i < aEndSeg; i += step)
{
if (currentIndex >= vertices.Length - 2)
{
End();
Begin();
}
vertices[currentIndex].Position.X =
aPolygon.TransformedPoints[i % aPolygon.TransformedPoints.Length].X;
vertices[currentIndex].Position.Y =
aPolygon.TransformedPoints[i % aPolygon.TransformedPoints.Length].Y;
vertices[currentIndex++].Color = aColor;
vertices[currentIndex].Position.X =
aPolygon.TransformedPoints[(i + 1) %
aPolygon.TransformedPoints.Length].X;
vertices[currentIndex].Position.Y =
aPolygon.TransformedPoints[(i + 1) %
aPolygon.TransformedPoints.Length].Y;
vertices[currentIndex++].Color = aColor;
lineCount++;
}
}
/// <summary>
/// Create a polygon shaped like an atom (circle).
/// </summary>
/// <param name="radius">The radius of the oxygen.</param>
/// <returns>A new VectorPolygon object in the shape of an atom.</returns>
public static VectorPolygon CreateAtom(float radius)
{
VectorPolygon polygon = CreateCircle(Vector2.Zero, radius, 12);
for (int i = 0; i < polygon.Points.Length; ++i)
{
Vector2 normal = Vector2.Normalize(polygon.Points[i]);
polygon.Points[i] += normal * ((radius * 0.2f) *
(float)random.NextDouble() - (radius * 0.1f));
}
return(polygon);
}
/// <summary>
/// Draws the given polygon.
/// </summary>
/// <param name="polygon">The polygon to render.</param>
/// <param name="color">The color to use when drawing the polygon.</param>
public void DrawPolygon(VectorPolygon polygon, Color color)
{
DrawPolygon(polygon, color, false);
}