public ExpBlockRef CreateBlockRef(ExpBlock block)
{
if (null == block)
{
return(null);
}
ExpBlockRef blockRef = new ExpBlockRef(block, 0.0, 0.0, 0.0);
_blockRefs.Add(blockRef);
return(blockRef);
}
void ExportEntity(ref StringBuilder sb, ExpPen pen, ExpBlockRef blockRef, ExpEntity entity)
{
const double INCH2MM = 72.0 / 25.4;
if (entity.Pen != pen)
{
return;
}
ExpLine line = entity as ExpLine;
if (null != line)
{
double X0 = line.X0, Y0 = line.Y0, X1 = line.X1, Y1 = line.Y1;
if (null != blockRef)
{
blockRef.TransformPoint(line.X0, line.Y0, out X0, out Y0);
}
sb.AppendLine(string.Format(
CultureInfo.InvariantCulture,
"{0:0.###} {1:0.###} m",
X0 * INCH2MM, Y0 * INCH2MM));
if (null != blockRef)
{
blockRef.TransformPoint(line.X1, line.Y1, out X1, out Y1);
}
sb.AppendLine(string.Format(
CultureInfo.InvariantCulture,
"{0:0.###} {1:0.###} L",
X1 * INCH2MM, Y1 * INCH2MM));
sb.AppendLine("S");
}
ExpArc arc = entity as ExpArc;
if (null != arc)
{
// divide arc if necessary
int iStep = (int)Math.Ceiling(arc.OpeningAngle / 91.0);
iStep = iStep >= 1 ? iStep : 1;
const double rad = Math.PI / 180.0;
const double paga = 1.0;
double angleStep = arc.OpeningAngle / iStep;
double ang1 = arc.Angle0;
double xc = arc.Xcenter;
double yc = arc.Ycenter;
double dim = arc.Radius;
double dir = arc.Angle0;
for (int i = 0; i < iStep; ++i)
{
double ang2 = ang1 + angleStep;
// control points of elipse arc in ellipse local coord
double x1 = arc.Radius * Math.Cos((ang1 - dir) * rad);
double y1f = arc.Radius * paga * Math.Sin((ang1 - dir) * rad);
double x4 = dim * Math.Cos((ang2 - dir) * rad);
double y4 = dim * paga * Math.Sin((ang2 - dir) * rad);
double dx1 = -dim *Math.Sin((ang1 - dir) *rad);
double dy1 = dim * paga * Math.Cos((ang1 - dir) * rad);
double dx4 = -dim *Math.Sin((ang2 - dir) *rad);
double dy4 = dim * paga * Math.Cos((ang2 - dir) * rad);
double alpha = Math.Sin((ang2 - ang1) * rad) * ((Math.Sqrt(4.0 + 3.0 * Math.Atan(0.5 * (ang2 - ang1) * rad) * Math.Atan(0.5 * (ang2 - ang1) * rad))) - 1.0f) / 3.0f;
double x2 = x1 + alpha * dx1;
double y2 = y1f + alpha * dy1;
double x3 = x4 - alpha * dx4;
double y3 = y4 - alpha * dy4;
// rotation
Rotation(ref x1, ref y1f, x1, y1f, Math.Cos(dir * rad), Math.Sin(dir * rad));
Rotation(ref x2, ref y2, x2, y2, Math.Cos(dir * rad), Math.Sin(dir * rad));
Rotation(ref x3, ref y3, x3, y3, Math.Cos(dir * rad), Math.Sin(dir * rad));
Rotation(ref x4, ref y4, x4, y4, Math.Cos(dir * rad), Math.Sin(dir * rad));
// translation
x1 += xc; y1f += yc;
x2 += xc; y2 += yc;
x3 += xc; y3 += yc;
x4 += xc; y4 += yc;
double X1 = x1, Y1 = y1f;
if (null != blockRef)
{
blockRef.TransformPoint(x1, y1f, out X1, out Y1);
}
double X2 = x2, Y2 = y2;
if (null != blockRef)
{
blockRef.TransformPoint(x2, y2, out X2, out Y2);
}
double X3 = x3, Y3 = y3;
if (null != blockRef)
{
blockRef.TransformPoint(x3, y3, out X3, out Y3);
}
double X4 = x4, Y4 = y4;
if (null != blockRef)
{
blockRef.TransformPoint(x4, y4, out X4, out Y4);
}
sb.AppendLine(string.Format(
CultureInfo.InvariantCulture,
"{0:0.##} {1:0.##} m",
X1 * INCH2MM, Y1 * INCH2MM));
sb.AppendLine(string.Format(CultureInfo.InvariantCulture,
"{0:0.##} {1:0.##} {2:0.##} {3:0.##} {4:0.##} {5:0.##} c",
X2 * INCH2MM, Y2 * INCH2MM, X3 * INCH2MM, Y3 * INCH2MM, X4 * INCH2MM, Y4 * INCH2MM));
sb.AppendLine("S");
ang1 = ang2;
}
}
}
