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struct marginT {
path g;
real begin,end;
};
typedef marginT margin(path, pen);
path trim(path g, real begin, real end=begin) {
real a=arctime(g,begin);
real b=arctime(g,arclength(g)-end);
return a <= b ? subpath(g,a,b) : point(g,a);
}
margin operator +(margin ma, margin mb)
{
return new marginT(path g, pen p) {
marginT 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;
};
}
margin NoMargin()
{
return new marginT(path g, pen) {
marginT margin;
margin.begin=margin.end=0;
margin.g=g;
return margin;
};
}
margin Margin(real begin, real end=begin)
{
return new marginT(path g, pen p) {
marginT margin;
real factor=labelmargin(p);
margin.begin=begin*factor;
margin.end=end*factor;
margin.g=trim(g,margin.begin,margin.end);
return margin;
};
}
margin PenMargin(real begin, real end=begin)
{
return new marginT(path g, pen p) {
marginT margin;
real factor=linewidth(p);
margin.begin=(begin+0.5)*factor;
margin.end=(end+0.5)*factor;
margin.g=trim(g,margin.begin,margin.end);
return margin;
};
}
margin DotMargin(real begin, real end=begin)
{
return new marginT(path g, pen p) {
marginT margin;
real margindot(real x) {return x > 0 ? dotfactor*x : x;}
real factor=linewidth(p);
margin.begin=(margindot(begin)+0.5)*factor;
margin.end=(margindot(end)+0.5)*factor;
margin.g=trim(g,margin.begin,margin.end);
return margin;
};
}
margin TrueMargin(real begin, real end=begin)
{
return new marginT(path g, pen p) {
marginT margin;
margin.begin=begin;
margin.end=end;
margin.g=trim(g,begin,end);
return margin;
};
}
margin NoMargin=NoMargin(),
BeginMargin=Margin(1,0),
Margin=Margin(0,1),
EndMargin=Margin,
Margins=Margin(1,1),
BeginPenMargin=PenMargin(0.5,-0.5),
PenMargin=PenMargin(-0.5,0.5),
EndPenMargin=PenMargin,
PenMargins=PenMargin(0.5,0.5),
BeginDotMargin=DotMargin(0.5,-0.5),
DotMargin=DotMargin(-0.5,0.5),
EndDotMargin=DotMargin,
DotMargins=DotMargin(0.5,0.5);
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