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+struct marginT3 {
+ path3 g;
+ real begin,end;
+};
+
+typedef marginT3 margin3(path3, pen);
+
+path3 trim(path3 g, real begin, real end) {
+ real a=arctime(g,begin);
+ real b=arctime(g,arclength(g)-end);
+ return a <= b ? subpath(g,a,b) : point(g,a);
+}
+
+margin3 operator +(margin3 ma, margin3 mb)
+{
+ return new marginT3(path3 g, pen p) {
+ marginT3 margin;
+ real ba=ma(g,p).begin < 0 ? 0 : ma(g,p).begin;
+ real bb=mb(g,p).begin < 0 ? 0 : mb(g,p).begin;
+ real ea=ma(g,p).end < 0 ? 0 : ma(g,p).end;
+ real eb=mb(g,p).end < 0 ? 0 : mb(g,p).end;
+ margin.begin=ba+bb;
+ margin.end=ea+eb;
+ margin.g=trim(g,margin.begin,margin.end);
+ return margin;
+ };
+}
+
+margin3 NoMargin3()
+{
+ return new marginT3(path3 g, pen) {
+ marginT3 margin;
+ margin.begin=margin.end=0;
+ margin.g=g;
+ return margin;
+ };
+}
+
+margin3 Margin3(real begin, real end)
+{
+ return new marginT3(path3 g, pen p) {
+ marginT3 margin;
+ real factor=labelmargin(p);
+ real w=0.5*linewidth(p);
+ margin.begin=begin*factor-w;
+ margin.end=end*factor-w;
+ margin.g=trim(g,margin.begin,margin.end);
+ return margin;
+ };
+}
+
+margin3 PenMargin3(real begin, real end)
+{
+ return new marginT3(path3 g, pen p) {
+ marginT3 margin;
+ real factor=linewidth(p);
+ margin.begin=begin*factor;
+ margin.end=end*factor;
+ margin.g=trim(g,margin.begin,margin.end);
+ return margin;
+ };
+}
+
+margin3 DotMargin3(real begin, real end)
+{
+ return new marginT3(path3 g, pen p) {
+ marginT3 margin;
+ real margindot(real x) {return x > 0 ? dotfactor*x : x;}
+ real factor=linewidth(p);
+ margin.begin=margindot(begin)*factor;
+ margin.end=margindot(end)*factor;
+ margin.g=trim(g,margin.begin,margin.end);
+ return margin;
+ };
+}
+
+margin3 TrueMargin3(real begin, real end)
+{
+ return new marginT3(path3 g, pen p) {
+ marginT3 margin;
+ margin.begin=begin;
+ margin.end=end;
+ margin.g=trim(g,begin,end);
+ return margin;
+ };
+}
+
+margin3 NoMargin3=NoMargin3(),
+ BeginMargin3=Margin3(1,0),
+ Margin3=Margin3(0,1),
+ EndMargin3=Margin3,
+ Margins3=Margin3(1,1),
+ BeginPenMargin3=PenMargin3(0.5,-0.5),
+ BeginPenMargin2=PenMargin3(1.0,-0.5),
+ PenMargin3=PenMargin3(-0.5,0.5),
+ PenMargin2=PenMargin3(-0.5,1.0),
+ EndPenMargin3=PenMargin3,
+ EndPenMargin2=PenMargin2,
+ PenMargins3=PenMargin3(0.5,0.5),
+ PenMargins2=PenMargin3(1.0,1.0),
+ BeginDotMargin3=DotMargin3(0.5,-0.5),
+ DotMargin3=DotMargin3(-0.5,0.5),
+ EndDotMargin3=DotMargin3,
+ DotMargins3=DotMargin3(0.5,0.5);