public void DrawCurve(Pen pen, PointF[] points, int offset, int numberOfSegments, float tension)
{
ChartGraphics chartGraphics = this as ChartGraphics;
if (chartGraphics == null || !chartGraphics.IsMetafile)
{
RenderingObject.DrawCurve(pen, points, offset, numberOfSegments, tension);
return;
}
PointF[] array = null;
if (offset == 0 && numberOfSegments == points.Length - 1)
{
RenderingObject.DrawCurve(pen, points, offset, numberOfSegments, tension);
return;
}
if (offset == 0 && numberOfSegments < points.Length - 1)
{
array = new PointF[numberOfSegments + 2];
for (int i = 0; i < numberOfSegments + 2; i++)
{
array[i] = points[i];
}
}
else if (offset > 0 && offset + numberOfSegments == points.Length - 1)
{
array = new PointF[numberOfSegments + 2];
for (int j = 0; j < numberOfSegments + 2; j++)
{
array[j] = points[offset + j - 1];
}
offset = 1;
}
else if (offset > 0 && offset + numberOfSegments < points.Length - 1)
{
array = new PointF[numberOfSegments + 3];
for (int k = 0; k < numberOfSegments + 3; k++)
{
array[k] = points[offset + k - 1];
}
offset = 1;
}
RenderingObject.DrawCurve(pen, array, offset, numberOfSegments, tension);
}
public void DrawCurve(Pen pen, PointF[] points, int offset, int numberOfSegments, float tension)
{
RenderingObject.DrawCurve(pen, points, offset, numberOfSegments, tension);
}
/// <summary>
/// Draws a cardinal spline through a specified array of PointF structures
/// using a specified tension. The drawing begins offset from
/// the beginning of the array.
/// </summary>
/// <param name="pen">Pen object that determines the color, width, and height of the curve.</param>
/// <param name="points">Array of PointF structures that define the spline.</param>
/// <param name="offset">Offset from the first element in the array of the points parameter to the starting point in the curve.</param>
/// <param name="numberOfSegments">Number of segments after the starting point to include in the curve.</param>
/// <param name="tension">Value greater than or equal to 0.0F that specifies the tension of the curve.</param>
internal void DrawCurve(
Pen pen,
PointF[] points,
int offset,
int numberOfSegments,
float tension
)
{
ChartGraphics chartGraphics = this as ChartGraphics;
if (chartGraphics == null || !chartGraphics.IsMetafile)
{
RenderingObject.DrawCurve(pen, points, offset, numberOfSegments, tension);
}
else
{
// Special handling required for the metafiles. We cannot pass large array of
// points because they will be persisted inside EMF file and cause exponential
// increase in emf file size. Draw curve method uses additional 2, 3 or 4 points
// depending on which segement is drawn.
PointF[] pointsExact = null;
if (offset == 0 && numberOfSegments == points.Length - 1)
{
// In case the array contains the minimum required number of points
// to draw segments - just call the curve drawing method
RenderingObject.DrawCurve(pen, points, offset, numberOfSegments, tension);
}
else
{
if (offset == 0 && numberOfSegments < points.Length - 1)
{
// Segment is at the beginning of the array with more points following
pointsExact = new PointF[numberOfSegments + 2];
for (int index = 0; index < numberOfSegments + 2; index++)
{
pointsExact[index] = points[index];
}
}
else if (offset > 0 && (offset + numberOfSegments) == points.Length - 1)
{
// Segment is at the end of the array with more points prior to it
pointsExact = new PointF[numberOfSegments + 2];
for (int index = 0; index < numberOfSegments + 2; index++)
{
pointsExact[index] = points[offset + index - 1];
}
offset = 1;
}
else if (offset > 0 && (offset + numberOfSegments) < points.Length - 1)
{
// Segment in the middle of the array with points prior and following it
pointsExact = new PointF[numberOfSegments + 3];
for (int index = 0; index < numberOfSegments + 3; index++)
{
pointsExact[index] = points[offset + index - 1];
}
offset = 1;
}
// Render the curve using minimum number of required points in the array
RenderingObject.DrawCurve(pen, pointsExact, offset, numberOfSegments, tension);
}
}
}
