public void AddLines(PointF [] points)
{
if (points == null)
{
throw new ArgumentNullException("points");
}
if (points.Length == 0)
{
return;
}
if (NativeObject.LastFigureClosed)
{
NativeObject.moveTo(points[0].X, points[0].Y);
}
else
{
NativeObject.lineTo(points[0].X, points[0].Y);
}
for (int i = 1; i < points.Length; i++)
{
NativeObject.lineTo(points[i].X, points[i].Y);
}
}
internal void AddRectangle(float x, float y, float w, float h)
{
NativeObject.moveTo(x, y);
NativeObject.lineTo(x + w, y);
NativeObject.lineTo(x + w, y + h);
NativeObject.lineTo(x, y + h);
NativeObject.closePath();
}
public void AddPolygon(PointF [] points)
{
if (points == null)
{
throw new ArgumentNullException("points");
}
if (points.Length < 3)
{
throw new ArgumentException("Invalid parameter used.");
}
NativeObject.moveTo(points[0].X, points[0].Y);
for (int i = 1; i < points.Length; i++)
{
NativeObject.lineTo(points[i].X, points[i].Y);
}
NativeObject.closePath();
}
private void SetPath(Point [] pts, byte [] types)
{
NativeObject.Clear();
if (((PathPointType)types [0] & PathPointType.PathTypeMask) != PathPointType.Start)
{
NativeObject.moveTo(pts [0].X, pts [0].Y);
}
for (int i = 0; i < pts.Length; i++)
{
switch (((PathPointType)types [i] & PathPointType.PathTypeMask))
{
case PathPointType.Start:
NativeObject.moveTo(pts [i].X, pts [i].Y);
break;
case PathPointType.Line:
NativeObject.lineTo(pts [i].X, pts [i].Y);
break;
case PathPointType.Bezier3:
float x1 = pts [i].X;
float y1 = pts [i].Y;
i++;
float x2 = pts [i].X;
float y2 = pts [i].Y;
i++;
float x3 = pts [i].X;
float y3 = pts [i].Y;
NativeObject.curveTo(x1, y1, x2, y2, x3, y3);
break;
}
if (((PathPointType)types [i] & PathPointType.CloseSubpath) != 0)
{
NativeObject.closePath();
}
if (((PathPointType)types [i] & PathPointType.PathMarker) != 0)
{
NativeObject.SetMarkers();
}
}
}
/// <summary>
/// Based on http://pubpages.unh.edu/~cs770/a5/cardinal.html
/// </summary>
/// <param name="pts">point array (x1,y1,x2,y2 ...).
/// The first and last points considered only for calculations, but are not added.</param>
void AddCurve(float[] pts, bool connect, float tension)
{
tension /= 3f; //looks like a good pick
if (connect)
{
NativeObject.lineTo(pts[2], pts[3]);
}
else
{
NativeObject.moveTo(pts[2], pts[3]);
}
float dx = pts[4] - pts[0];
float dy = pts[5] - pts[1];
float sx = pts[2] + tension * dx;
float sy = pts[3] + tension * dy;
for (int offset = 2, total = pts.Length - 4; offset < total; offset += 2)
{
int cur_offset = offset;
int pX = cur_offset++;
int pY = cur_offset++;
int X = cur_offset++;
int Y = cur_offset++;
int nX = cur_offset++;
int nY = cur_offset++;
dx = pts[nX] - pts[pX];
dy = pts[nY] - pts[pY];
float rx = pts[X] - tension * dx;
float ry = pts[Y] - tension * dy;
NativeObject.curveTo(sx, sy, rx, ry, pts[X], pts[Y]);
sx = pts[X] + tension * dx;
sy = pts[Y] + tension * dy;
}
}
