private void CalculateRoundLines(CornersLine line1, CornersLine line2,
CornersArc arc)
{
double f1 = Math.Atan2(line1.Y1 - line1.Y2, line1.X1 - line1.X2);
double f2 = Math.Atan2(line2.Y2 - line2.Y1, line2.X2 - line2.X1);
double alfa = f2 - f1;
if ((alfa == 0) || (Math.Abs(alfa) == Math.PI))
{
addWithoutArc(arc);
}
else
{
addWithArc(line1, line2, arc, f1, f2, alfa);
}
}
private void fillList()
{
CornersLine line;
switch (points.Length)
{
case 2:
line = new CornersLine();
list.Add(line);
line.X1 = points[0].X;
line.Y1 = points[0].Y;
line.X2 = points[1].X;
line.Y2 = points[1].Y;
break;
default:
PointF firstPoint = new PointF(points[0].X, points[0].Y);
for (int i = 1, j = 0; i < points.Length; i++)
{
line = new CornersLine();
list.Add(line);
line.X1 = points[j].X;
line.Y1 = points[j].Y;
++j;
line.X2 = points[j].X;
line.Y2 = points[j].Y;
if (i != points.Length - 1)
{
CornersArc arc = new CornersArc();
list.Add(arc);
}
else
{
if ((firstPoint.X == points[j].X) && (firstPoint.Y == points[j].Y))
{
CornersArc arc = new CornersArc();
list.Add(arc);
}
}
}
break;
}
}
private void addWithArc(CornersLine line1, CornersLine line2, CornersArc arc, double f1, double f2, double alfa)
{
double s = radius / Math.Tan(alfa / 2);
double line1Length = Math.Sqrt(Math.Pow(line1.X1 - line1.X2, 2) + Math.Pow(line1.Y1 - line1.Y2, 2));
double line2Length = Math.Sqrt(Math.Pow(line2.X1 - line2.X2, 2) + Math.Pow(line2.Y1 - line2.Y2, 2));
double newRadius = radius;
if ((Math.Abs(s) > line1Length / 2) || (Math.Abs(s) > line2Length / 2))
{
if (s < 0)
{
s = -Math.Min(line1Length / 2, line2Length / 2);
}
else
{
s = Math.Min(line1Length / 2, line2Length / 2);
}
newRadius = s * Math.Tan(alfa / 2);
}
line1.NewX2 = line1.X2 + Math.Abs(s) * Math.Cos(f1);
line1.NewY2 = line1.Y2 + Math.Abs(s) * Math.Sin(f1);
line2.NewX1 = line2.X1 + Math.Abs(s) * Math.Cos(f2);
line2.NewY1 = line2.Y1 + Math.Abs(s) * Math.Sin(f2);
double circleCenterAngle = f1 + alfa / 2;
double cs = newRadius / Math.Sin(alfa / 2);
PointF circleCenter = new PointF();
if (s > 0)
{
circleCenter.X = (float)(line1.X2 + cs * Math.Cos(circleCenterAngle));
circleCenter.Y = (float)(line1.Y2 + cs * Math.Sin(circleCenterAngle));
}
else
{
circleCenter.X = (float)(line1.X2 - cs * Math.Cos(circleCenterAngle));
circleCenter.Y = (float)(line1.Y2 - cs * Math.Sin(circleCenterAngle));
}
double firstAngle = Math.Atan2(line1.NewY2 - circleCenter.Y, line1.NewX2 - circleCenter.X);
double secondAngle = Math.Atan2(line2.NewY1 - circleCenter.Y, line2.NewX1 - circleCenter.X);
double startAngle = firstAngle;
double sweepAngle = secondAngle - firstAngle;
if (sweepAngle > Math.PI)
{
sweepAngle = -(2 * Math.PI - sweepAngle);
}
else
{
if (sweepAngle < -Math.PI)
{
sweepAngle = (2 * Math.PI + sweepAngle);
}
}
arc.X = circleCenter.X - newRadius;
arc.Y = circleCenter.Y - newRadius;
arc.Width = newRadius * 2;
arc.Height = newRadius * 2;
arc.StartAngle = startAngle * (180 / Math.PI);
arc.SweepAngle = sweepAngle * (180 / Math.PI);
}