void REllipseEntity::setShape(const REllipse& e) {
data.setCenter(e.getCenter());
data.setMajorPoint(e.getMajorPoint());
data.setRatio(e.getRatio());
data.setStartParam(e.getStartParam());
data.setEndParam(e.getEndParam());
data.setReversed(e.isReversed());
}
/**
* Exports an ellipse with the current attributes.
* \todo switch from line based interpolation to arcs.
*/
void RExporter::exportEllipse(const REllipse& ellipse, double offset) {
if (ellipse.getMajorRadius()<RS::PointTolerance ||
ellipse.getMinorRadius()<RS::PointTolerance) {
return;
}
RPolyline polyline;
RVector cp = ellipse.getCenter();
double radius1 = ellipse.getMajorRadius();
double radius2 = ellipse.getMinorRadius();
double angle = ellipse.getAngle();
double a1 = ellipse.getStartParam();
double a2 = ellipse.getEndParam();
bool reversed = ellipse.isReversed();
double aStep; // Angle Step (rad)
double a; // Current Angle (rad)
aStep=0.05;
RVector vp;
RVector vc(cp.x, cp.y);
vp.set(cp.x+cos(a1)*radius1,
cp.y+sin(a1)*radius2);
vp.rotate(angle, vc);
polyline.appendVertex(vp);
if (!reversed) {
// Arc Counterclockwise:
if (a1>a2-RS::AngleTolerance) {
a2+=2*M_PI;
}
for(a=a1+aStep; a<=a2; a+=aStep) {
vp.set(cp.x+cos(a)*radius1,
cp.y+sin(a)*radius2);
vp.rotate(angle, vc);
polyline.appendVertex(vp);
}
} else {
// Arc Clockwise:
if (a1<a2+RS::AngleTolerance) {
a2-=2*M_PI;
}
for(a=a1-aStep; a>=a2; a-=aStep) {
vp.set(cp.x+cos(a)*radius1,
cp.y+sin(a)*radius2);
vp.rotate(angle, vc);
polyline.appendVertex(vp);
}
}
vp.set(cp.x+cos(a2)*radius1,
cp.y+sin(a2)*radius2);
vp.rotate(angle, vc);
polyline.appendVertex(vp);
exportPolyline(polyline, offset);
}
