This bug is about the svg writer. Since the pictures’ Origin Point is at the lefttop of the screen, the picture writed by svgwriter is inversed in vertical direction. Here is the code modified by me.
void writeHeader(){
double height=management.getBoundingBox(0).y1*20;
out << “<?xml version=\"1.0\" standalone=\"no\"?>\n”;
out << “<!DOCTYPE svg PUBLIC"
<\n”;
out << “\t<svg width=“100%” height=“100%” version=“1.1” xmlns=“http://www.w3.org/2000/svg">";
out << “\n\t<g transform=“translate(0,”<<height<<”) scale(1,-1)”>”;
out << std::endl;
}
void writeEnd(){
out << “\t\n”;
out << “” << std::endl;
}