private void DrawCardinal()
{
if (points.Count > 2)
{
writeableBmp.DrawCurve(GetPointArray(), Tension, Colors.Yellow);
}
}
private void DrawCardinal(WriteableBitmap writeableBmp)
{
if (points.Count > 2)
{
writeableBmp.DrawCurve(GetPointArray(), Tension, Colors.Red);
}
}
/// <summary>
/// Draws a Cardinal spline (cubic) defined by a point collection.
/// The cardinal spline passes through each point in the collection.
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="points">The points for the curve in x and y pairs, therefore the array is interpreted as (x1, y1, x2, y2, x3, y3, x4, y4, x1, x2 ..., xn, yn).</param>
/// <param name="tension">The tension of the curve defines the shape. Usually between 0 and 1. 0 would be a straight line.</param>
/// <param name="color">The color for the spline.</param>
public static void DrawCurve(this WriteableBitmap bmp, int[] points, float tension, Color color)
{
// Add one to use mul and cheap bit shift for multiplicaltion
int a = color.A + 1;
int col = (color.A << 24)
| ((byte)((color.R * a) >> 8) << 16)
| ((byte)((color.G * a) >> 8) << 8)
| ((byte)((color.B * a) >> 8));
bmp.DrawCurve(points, tension, col);
}
private void Draw(WriteableBitmap writeableBmp, Branch branch)
{
int[] pts = new int[]
{
branch.Start.X, branch.Start.Y,
branch.Middle.X, branch.Middle.Y,
branch.End.X, branch.End.Y,
};
// Draw with cardinal spline
writeableBmp.DrawCurve(pts, Tension, this.Color);
foreach (var b in branch.Branches)
{
Draw(writeableBmp, b);
}
}
/// <summary>
/// Draws a Cardinal spline (cubic) defined by a point collection.
/// The cardinal spline passes through each point in the collection.
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="points">The points for the curve in x and y pairs, therefore the array is interpreted as (x1, y1, x2, y2, x3, y3, x4, y4, x1, x2 ..., xn, yn).</param>
/// <param name="tension">The tension of the curve defines the shape. Usually between 0 and 1. 0 would be a straight line.</param>
/// <param name="color">The color for the spline.</param>
public static void DrawCurve(this WriteableBitmap bmp, int[] points, float tension, Color color)
{
var col = ConvertColor(color);
bmp.DrawCurve(points, tension, col);
}
