private void btnClipLines_Click(object sender, EventArgs e)
{
var newLines = new List <Tuple <PointF, PointF> >();
foreach (var line in _lines)
{
var p1 = line.Item1;
var p2 = line.Item2;
var clipped = CohenSutherland.ClipSegment(_bounds, p1, p2);
if (clipped != null)
{
newLines.Add(clipped);
}
}
_lines = newLines;
splitContainer1.Panel2.Invalidate();
}
public Tuple <PointF, PointF> GetClippedEnds(Rectangle bounds)
{
Site vertex0, vertex1;
var xmin = bounds.X;
var ymin = bounds.Y;
var xmax = bounds.Right;
var ymax = bounds.Bottom;
float x0, x1, y0, y1;
if (Math.Abs(A - 1.0) < Double.Epsilon && B >= 0.0)
{
vertex0 = RightVertex;
vertex1 = LeftVertex;
}
else
{
vertex0 = LeftVertex;
vertex1 = RightVertex;
}
if (Math.Abs(A - 1.0) < Double.Epsilon)
{
y0 = ymin;
if (vertex0 != null && vertex0.Y > ymin)
{
y0 = vertex0.Y;
}
if (y0 > ymax)
{
return(null);
}
x0 = C - B * y0;
y1 = ymax;
if (vertex1 != null && vertex1.Y < ymax)
{
y1 = vertex1.Y;
}
if (y1 < ymin)
{
return(null);
}
x1 = C - B * y1;
if ((x0 > xmax && x1 > xmax) || (x0 < xmin && x1 < xmin))
{
return(null);
}
if (x0 > xmax)
{
x0 = xmax;
y0 = (C - x0) / B;
}
else if (x0 < xmin)
{
x0 = xmin;
y0 = (C - x0) / B;
}
if (x1 > xmax)
{
x1 = xmax;
y1 = (C - x1) / B;
}
else if (x1 < xmin)
{
x1 = xmin;
y1 = (C - x1) / B;
}
}
else
{
x0 = xmin;
if (vertex0 != null && vertex0.X > xmin)
{
x0 = vertex0.X;
}
if (x0 > xmax)
{
return(null);
}
y0 = C - A * x0;
x1 = xmax;
if (vertex1 != null && vertex1.X < xmax)
{
x1 = vertex1.X;
}
if (x1 < xmin)
{
return(null);
}
y1 = C - A * x1;
if ((y0 > ymax && y1 > ymax) || (y0 < ymin && y1 < ymin))
{
return(null);
}
if (y0 > ymax)
{
y0 = ymax;
x0 = (C - y0) / A;
}
else if (y0 < ymin)
{
y0 = ymin;
x0 = (C - y0) / A;
}
if (y1 > ymax)
{
y1 = ymax;
x1 = (C - y1) / A;
}
else if (y1 < ymin)
{
y1 = ymin;
x1 = (C - y1) / A;
}
}
var clipped = CohenSutherland.ClipSegment(bounds, new PointF(x0, y0), new PointF(x1, y1));
//Console.WriteLine("cl {0} {1} {2} {3}", x0, y0, x1, y1);
return((vertex0 == LeftVertex) ?
new Tuple <PointF, PointF>(clipped.Item1, clipped.Item2) :
new Tuple <PointF, PointF>(clipped.Item2, clipped.Item1));
}
