private void AddArcs()
{
foreach (Arc obj in dxf.Arcs)
{
float startAngle = ConvertToGdiAngle(obj.StartAngle);
float endAngle = ConvertToGdiAngle(obj.EndAngle);
ArcF arcF;
if (startAngle < endAngle)
{
arcF = new ArcF(ConvertToGdiX(obj.Center.X - obj.Radius), ConvertToGdiY(obj.Center.Y + obj.Radius), 2 * (float)obj.Radius, 2 * (float)obj.Radius, startAngle, (startAngle - endAngle), IsDotted(obj));
}
else
{
arcF = new ArcF(ConvertToGdiX(obj.Center.X - obj.Radius), ConvertToGdiY(obj.Center.Y + obj.Radius), 2 * (float)obj.Radius, 2 * (float)obj.Radius, startAngle, (-startAngle + endAngle), IsDotted(obj));
}
arcList.Add(arcF);
List <PointF> pts = new List <PointF>();
PointF startPoint = new PointF(ConvertToGdiX(Math.Cos(arcF.StartAngle) * arcF.Radius), (float)(Math.Sin(arcF.StartAngle) * arcF.Radius));
PointF endPoint = new PointF(ConvertToGdiX(Math.Cos(arcF.StartAngle + arcF.SweepAngle) * arcF.Radius), (float)(Math.Sin(arcF.StartAngle + arcF.SweepAngle) * arcF.Radius));
pts.Add(startPoint);
pts.Add(endPoint);
PointF point0 = new PointF(arcF.Rectangle.Right, arcF.Center.Y);
PointF point90 = new PointF(arcF.Center.X, arcF.Rectangle.Bottom);
PointF point180 = new PointF(arcF.Rectangle.Left, arcF.Center.Y);
PointF point270 = new PointF(arcF.Center.X, arcF.Rectangle.Top);
if ((arcF.StartAngle <= 0 && arcF.StartAngle + arcF.SweepAngle > 0) ||
(arcF.StartAngle >= 0 && arcF.StartAngle + arcF.SweepAngle < 0) ||
(arcF.StartAngle <= 360 && arcF.StartAngle + arcF.SweepAngle > 360) ||
(arcF.StartAngle >= 360 && arcF.StartAngle + arcF.SweepAngle < 360))
{
pts.Add(point0);
}
if ((arcF.StartAngle <= 90 && arcF.StartAngle + arcF.SweepAngle > 90) ||
(arcF.StartAngle >= 90 && arcF.StartAngle + arcF.SweepAngle < 90))
{
pts.Add(point90);
}
if ((arcF.StartAngle <= 180 && arcF.StartAngle + arcF.SweepAngle > 180) ||
(arcF.StartAngle >= 180 && arcF.StartAngle + arcF.SweepAngle < 180))
{
pts.Add(point180);
}
if ((arcF.StartAngle <= 270 && arcF.StartAngle + arcF.SweepAngle > 270) ||
(arcF.StartAngle >= 270 && arcF.StartAngle + arcF.SweepAngle < 270))
{
pts.Add(point270);
}
foreach (var point in pts)
{
if (dxfMinX > point.X)
{
dxfMinX = point.X;
}
if (dxfMinY > point.Y)
{
dxfMinY = point.Y;
}
if (dxfMaxX < point.X)
{
dxfMaxX = point.X;
}
if (dxfMaxY < point.Y)
{
dxfMaxY = point.Y;
}
}
}
}
void GenArcFromThreePoint(float x1, float y1, float x2, float y2, float x3, float y3)
{
double a = x1 - x2;
double b = y1 - y2;
double c = x1 - x3;
double d = y1 - y3;
double e = ((x1 * x1 - x2 * x2) + (y1 * y1 - y2 * y2)) / 2.0;
double f = ((x1 * x1 - x3 * x3) + (y1 * y1 - y3 * y3)) / 2.0;
double det = b * c - a * d;
if (Math.Abs(det) > 0.001)
{
//x0,y0为计算得到的原点
double x0 = -(d * e - b * f) / det;
double y0 = -(a * f - c * e) / det;
double radius = Math.Sqrt((x1 - x0) * (x1 - x0) + (y1 - y0) * (y1 - y0));
double angle1;
double angle2;
double angle3;
double sinValue1;
double cosValue1;
double sinValue2;
double cosValue2;
double sinValue3;
double cosValue3;
sinValue1 = (y1 - y0) / radius;
cosValue1 = (x1 - x0) / radius;
if (cosValue1 >= 0.99999)
{
cosValue1 = 0.99999;
}
if (cosValue1 <= -0.99999)
{
cosValue1 = -0.99999;
}
angle1 = Math.Acos(cosValue1);
angle1 = angle1 / 3.14 * 180;
if (sinValue1 < -0.05)
{
angle1 = 360 - angle1;
}
sinValue2 = (y2 - y0) / radius;
cosValue2 = (x2 - x0) / radius;
if (cosValue2 >= 0.99999)
{
cosValue2 = 0.99999;
}
if (cosValue2 <= -0.99999)
{
cosValue2 = -0.99999;
}
angle2 = Math.Acos(cosValue2);
angle2 = angle2 / 3.14 * 180;
if (sinValue2 < -0.05)
{
angle2 = 360 - angle2;
}
sinValue3 = (y3 - y0) / radius;
cosValue3 = (x3 - x0) / radius;
if (cosValue3 >= 0.99999)
{
cosValue3 = 0.99999;
}
if (cosValue3 <= -0.99999)
{
cosValue3 = -0.99999;
}
angle3 = Math.Acos(cosValue3);
angle3 = angle3 / 3.14 * 180;
if (sinValue3 < -0.05)
{
angle3 = 360 - angle3;
}
bool PosDown = false;
double Delta13;
if (angle1 < angle3)
{
Delta13 = angle3 - angle1;
}
else
{
Delta13 = angle3 - angle1 + 360;
}
double Delta12;
if (angle1 < angle2)
{
Delta12 = angle2 - angle1;
}
else
{
Delta12 = angle2 - angle1 + 360;
}
if (Delta13 > Delta12)
{
PosDown = true;
}
else
{
PosDown = false;
}
ArcF arcF;
if (PosDown)
{
if (angle3 > angle1)
{
arcF = new ArcF(new PointF((float)(x0 - radius), (float)(y0 - radius)), new SizeF((float)(2 * radius), (float)(2 * radius)), (float)(angle3), -(float)(angle3 - angle1), false);
//arcF.SetScale(scaleSize);
}
else
{
arcF = new ArcF(new PointF((float)(x0 - radius), (float)(y0 - radius)), new SizeF((float)(2 * radius), (float)(2 * radius)), (float)(angle3), -(float)(angle3 - angle1 + 360), false);
//arcF.SetScale(scaleSize);
}
}
else
{
if (angle1 > angle3)
{
arcF = new ArcF(new PointF((float)(x0 - radius), (float)(y0 - radius)), new SizeF((float)(2 * radius), (float)(2 * radius)), (float)(angle1), -(float)(angle1 - angle3), false);
//arcF.SetScale(scaleSize);
}
else
{
arcF = new ArcF(new PointF((float)(x0 - radius), (float)(y0 - radius)), new SizeF((float)(2 * radius), (float)(2 * radius)), (float)(angle1), -(float)(angle1 - angle3 + 360), false);
//arcF.SetScale(scaleSize);
}
}
if (arcF != null)
{
arcList.Add(arcF);
}
}
}