public void Clip_and_draw_line(double from_x, double from_y, double to_x, double to_y, Color PenColor)
{
bool inside; // Reset if all the line segment is outside the window.
// Original line coordinates
double x1 = from_x;
double y1 = from_y;
double x2 = to_x;
double y2 = to_y;
inside = true; // Assume some part of the line segment is inside the window.
if (from_x < 0)
{
inside = Clip_edge(ref from_x, ref from_y, 0, x1, y1, x2, y2, to_x >= 0);
}
else
{
if (to_x < 0)
{
inside = Clip_edge(ref to_x, ref to_y, 0, x2, y2, x1, y1, from_x >= 0);
}
}
if (inside)
{
if (from_x > ClipWidth)
{
inside = Clip_edge(ref from_x, ref from_y, ClipWidth, x1, y1, x2, y2, to_x <= ClipWidth);
}
else
{
if (to_x > ClipWidth)
{
inside = Clip_edge(ref to_x, ref to_y, ClipWidth, x2, y2, x1, y1, from_x <= ClipWidth);
}
}
}
if (inside)
{
if (from_y < 0)
{
inside = Clip_edge(ref from_y, ref from_x, 0, y1, x1, y2, x2, to_y >= 0);
}
else
{
if (to_y < 0)
{
inside = Clip_edge(ref to_y, ref to_x, 0, y2, x2, y1, x1, from_y >= 0);
}
}
}
if (inside)
{
if (from_y > ClipHeight)
{
inside = Clip_edge(ref from_y, ref from_x, ClipHeight, y1, x1, y2, x2, to_y <= ClipHeight);
}
else
{
if (to_y > ClipHeight)
{
inside = Clip_edge(ref to_y, ref to_x, ClipHeight, y2, x2, y1, x1, from_y <= ClipHeight);
}
}
if (inside)
{
DrawCanvasPen.Color = new SKColor(PenColor.R, PenColor.G, PenColor.B);
DrawCanvas.DrawLine(XAxisAdjust + XAxesDirection * (int)Math.Truncate(from_x),
YAxisAdjust - YAxesDirection * (int)Math.Truncate(from_y),
XAxisAdjust + XAxesDirection * (int)Math.Truncate(to_x),
YAxisAdjust - YAxesDirection * (int)Math.Truncate(to_y),
DrawCanvasPen);
}
}
}