void LC_MakerCamSVG::writePolyline(RS_Polyline* polyline) {
RS_DEBUG->print("RS_MakerCamSVG::writePolyline: Writing polyline ...");
std::string path = svgPathMoveTo(convertToSvg(polyline->getStartpoint()));
for(auto entity: *polyline){
if (!entity->isAtomic()) {
continue;
}
if (entity->rtti() == RS2::EntityArc) {
path += svgPathArc((RS_Arc*)entity);
}
else {
path += svgPathLineTo(convertToSvg(entity->getEndpoint()));
}
}
if (polyline->isClosed()) {
path += svgPathClose();
}
xmlWriter->addElement("path", NAMESPACE_URI_SVG);
xmlWriter->addAttribute("d", path);
xmlWriter->closeElement();
}
void LC_MakerCamSVG::writeArc(RS_Arc* arc) {
RS_DEBUG->print("RS_MakerCamSVG::writeArc: Writing arc ...");
std::string path = svgPathMoveTo(convertToSvg(arc->getStartpoint())) +
svgPathArc(arc);
xmlWriter->addElement("path", NAMESPACE_URI_SVG);
xmlWriter->addAttribute("d", path);
xmlWriter->closeElement();
}
void LC_MakerCamSVG::writeQuadraticBeziers(const std::vector<RS_Vector> &control_points, bool is_closed) {
std::vector<RS_Vector> bezier_points = calcQuadraticBezierPoints(control_points, is_closed);
std::string path = svgPathMoveTo(convertToSvg(bezier_points[0]));
int bezier_points_size = bezier_points.size();
int bezier_count = ((bezier_points_size - 1) / 2);
for (int i = 0; i < bezier_count; i++) {
path += svgPathQuadraticCurveTo(convertToSvg(bezier_points[2 * (i + 1)]), convertToSvg(bezier_points[2 * (i + 1) - 1]));
}
xmlWriter->addElement("path", NAMESPACE_URI_SVG);
xmlWriter->addAttribute("d", path);
xmlWriter->closeElement();
}
void LC_MakerCamSVG::writeEllipse(RS_Ellipse* ellipse) {
RS_Vector center = convertToSvg(ellipse->getCenter());
const RS_Vector centerTranslation=center - ellipse->getCenter();
double majorradius = ellipse->getMajorRadius();
double minorradius = ellipse->getMinorRadius();
if (convertEllipsesToBeziers) {
std::string path = "";
if (ellipse->isArc()) {
const int segments = 4;
RS_DEBUG->print("RS_MakerCamSVG::writeEllipse: Writing ellipse arc approximated by 'path' with %d cubic bézier segments (as discussed in https://www.spaceroots.org/documents/ellipse/elliptical-arc.pdf) ...", segments);
double x_axis_rotation = 2 * M_PI - ellipse->getAngle();
double start_angle = 2 * M_PI - ellipse->getAngle2();
double end_angle = 2 * M_PI - ellipse->getAngle1();
if (ellipse->isReversed()) {
double temp_angle = start_angle;
start_angle = end_angle;
end_angle = temp_angle;
}
if (end_angle <= start_angle) {
end_angle += 2 * M_PI;
}
double total_angle = end_angle - start_angle;
double alpha = calcAlpha(total_angle / segments);
RS_Vector start_point = centerTranslation + ellipse->getEllipsePoint(start_angle);
path = svgPathMoveTo(start_point);
for (int i = 1; i <= segments; i++) {
double segment_start_angle = start_angle + ((i - 1) / (double)segments) * total_angle;
double segment_end_angle = start_angle + (i / (double)segments) * total_angle;
RS_Vector segment_start_point = centerTranslation + ellipse->getEllipsePoint(segment_start_angle);
RS_Vector segment_end_point = centerTranslation + ellipse->getEllipsePoint(segment_end_angle);
RS_Vector segment_control_point_1 = segment_start_point + calcEllipsePointDerivative(majorradius, minorradius, x_axis_rotation, segment_start_angle) * alpha;
RS_Vector segment_control_point_2 = segment_end_point - calcEllipsePointDerivative(majorradius, minorradius, x_axis_rotation, segment_end_angle) * alpha;
path += svgPathCurveTo(segment_end_point, segment_control_point_1, segment_control_point_2);
}
}
else {
RS_DEBUG->print("RS_MakerCamSVG::writeEllipse: Writing ellipse approximated by 'path' with 4 cubic bézier segments (as discussed in http://www.tinaja.com/glib/ellipse4.pdf) ...");
const double kappa = 0.551784;
RS_Vector major {majorradius, 0.0};
RS_Vector minor {0.0, minorradius};
RS_Vector flip_y {1.0, -1.0};
major.rotate(ellipse->getAngle());
minor.rotate(ellipse->getAngle());
major.scale(flip_y);
minor.scale(flip_y);
RS_Vector offsetmajor {major * kappa};
RS_Vector offsetminor {minor * kappa};
path = svgPathMoveTo(center - major) +
svgPathCurveTo((center - minor), (center - major - offsetminor), (center - minor - offsetmajor)) +
svgPathCurveTo((center + major), (center - minor + offsetmajor), (center + major - offsetminor)) +
svgPathCurveTo((center + minor), (center + major + offsetminor), (center + minor + offsetmajor)) +
svgPathCurveTo((center - major), (center + minor - offsetmajor), (center - major + offsetminor)) +
svgPathClose();
}
xmlWriter->addElement("path", NAMESPACE_URI_SVG);
xmlWriter->addAttribute("d", path);
xmlWriter->closeElement();
}
else {
if (ellipse->isArc()) {
RS_DEBUG->print("RS_MakerCamSVG::writeEllipse: Writing ellipse arc as 'path' with arc segments ...");
double x_axis_rotation = 180 - (RS_Math::rad2deg(ellipse->getAngle()));
double startangle = RS_Math::rad2deg(ellipse->getAngle1());
double endangle = RS_Math::rad2deg(ellipse->getAngle2());
if (endangle <= startangle) {
endangle += 360;
}
bool large_arc_flag = ((endangle - startangle) > 180);
bool sweep_flag = false;
if (ellipse->isReversed()) {
large_arc_flag = !large_arc_flag;
sweep_flag = !sweep_flag;
}
std::string path = svgPathMoveTo(convertToSvg(ellipse->getStartpoint())) +
svgPathArc(convertToSvg(ellipse->getEndpoint()), majorradius, minorradius, x_axis_rotation, large_arc_flag, sweep_flag);
xmlWriter->addElement("path", NAMESPACE_URI_SVG);
xmlWriter->addAttribute("d", path);
xmlWriter->closeElement();
}
else {
RS_DEBUG->print("RS_MakerCamSVG::writeEllipse: Writing full ellipse as 'ellipse' ...");
double angle = 180 - (RS_Math::rad2deg(ellipse->getAngle()) - 90);
std::string transform = "translate(" + numXml(center.x) + ", " + numXml(center.y) + ") " +
"rotate(" + numXml(angle) + ")";
xmlWriter->addElement("ellipse", NAMESPACE_URI_SVG);
xmlWriter->addAttribute("rx", numXml(minorradius));
xmlWriter->addAttribute("ry", numXml(majorradius));
xmlWriter->addAttribute("transform", transform);
xmlWriter->closeElement();
}
}
}