// this is the recusive function to draw 1/3nd of the Von Koch flake
static void recursiveLine(YDisplayLayer layer, double x0, double y0, double x1, double y1,
int deep)
{
double dx, dy, mx, my;
if (deep <= 0)
{
layer.moveTo((int)(x0 + 0.5), (int)(y0 + 0.5));
layer.lineTo((int)(x1 + 0.5), (int)(y1 + 0.5));
}
else
{
dx = (x1 - x0) / 3;
dy = (y1 - y0) / 3;
mx = ((x0 + x1) / 2) + (0.87 * (y1 - y0) / 3);
my = ((y0 + y1) / 2) - (0.87 * (x1 - x0) / 3);
recursiveLine(layer, x0, y0, x0 + dx, y0 + dy, deep - 1);
recursiveLine(layer, x0 + dx, y0 + dy, mx, my, deep - 1);
recursiveLine(layer, mx, my, x1 - dx, y1 - dy, deep - 1);
recursiveLine(layer, x1 - dx, y1 - dy, x1, y1, deep - 1);
}
}
/**
* <summary>
* Draws a line from current drawing pointer position to the specified position.
* <para>
* The specified destination pixel is included in the line. The pointer position
* is then moved to the end point of the line.
* </para>
* </summary>
* <param name="x">
* the distance from left of layer to the end point of the line, in pixels
* </param>
* <param name="y">
* the distance from top of layer to the end point of the line, in pixels
* </param>
* <returns>
* <c>0</c> if the call succeeds.
* </returns>
* <para>
* On failure, throws an exception or returns a negative error code.
* </para>
*/
public virtual int lineTo(int x, int y)
{
return(_objptr.lineTo(x, y));
}