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/*****
* drawpath.cc
* Andy Hammerlindl 2002/06/06
*
* Stores a path that has been added to a picture.
*****/
#include <sstream>
#include <vector>
#include <cfloat>
#include "drawpath.h"
#include "psfile.h"
#include "util.h"
namespace camp {
double PatternLength(double arclength, const std::vector<double>& pat,
bool cyclic, double penwidth)
{
double sum=0.0;
size_t n=pat.size();
for(unsigned i=0; i < n; i ++)
sum += pat[i]*penwidth;
if(sum == 0.0) return 0.0;
if(n % 2 == 1) sum *= 2.0; // On/off pattern repeats after 2 cycles.
// Fix bounding box resolution problem. Example:
// asy -f pdf testlinetype; gv -scale -2 testlinetype.pdf
if(!cyclic && pat[0] == 0) sum += 1.0e-3*penwidth;
double terminator=(cyclic && arclength >= 0.5*sum) ? 0.0 : pat[0]*penwidth;
int ncycle=(int)((arclength-terminator)/sum+0.5);
return (ncycle >= 1 || terminator >= 0.75*arclength) ?
ncycle*sum+terminator : 0.0;
}
pen adjustdash(pen& p, double arclength, bool cyclic)
{
pen q=p;
// Adjust dash sizes to fit arclength; also compensate for linewidth.
string stroke=q.stroke();
if(!stroke.empty()) {
double penwidth=q.linetype().scale ? q.width() : 1.0;
double factor=penwidth;
std::vector<double> pat;
istringstream ibuf(stroke);
double l;
while(ibuf >> l) {
if(l < 0) l=0;
pat.push_back(l);
}
size_t n=pat.size();
if(q.linetype().adjust) {
if(arclength) {
if(n == 0) return q;
double denom=PatternLength(arclength,pat,cyclic,penwidth);
if(denom != 0.0) factor *= arclength/denom;
}
}
factor=max(factor,0.1);
ostringstream buf;
buf.setf(std::ios::fixed);
if(n > 0) {
for(size_t i=0; i < n-1; i++)
buf << pat[i]*factor << " ";
buf << pat[n-1]*factor;
}
q.setstroke(buf.str());
q.setoffset(q.linetype().offset*factor);
}
return q;
}
// Account for square or extended pen cap contributions to bounding box.
void cap(bbox& b, double t, path p, pen pentype) {
transform T=pentype.getTransform();
double h=0.5*pentype.width();
pair v=p.dir(t);
transform S=rotate(conj(v))*shiftless(T);
double xx=S.getxx(), xy=S.getxy();
double yx=S.getyx(), yy=S.getyy();
double y=hypot(yx,yy);
if(y == 0) return;
double numer=xx*yx+xy*yy;
double x=numer/y;
pair z=shift(T)*p.point(t);
switch(pentype.cap()) {
case 0:
{
pair d=rotate(v)*pair(x,y)*h;
b += z+d;
b += z-d;
break;
}
case 2:
{
transform R=rotate(v);
double w=(xx*yy-xy*yx)/y;
pair dp=R*pair(x+w,y)*h;
pair dm=R*pair(x-w,y)*h;
b += z+dp;
b += z+dm;
b += z-dp;
b += z-dm;
break;
}
}
}
void drawPathPenBase::strokebounds(bbox& b, const path& p)
{
Int l=p.length();
if(l < 0) return;
bbox penbounds=pentype.bounds();
if(cyclic() || pentype.cap() == 1) {
b += pad(p.bounds(),penbounds);
return;
}
b += p.internalbounds(penbounds);
cap(b,0,p,pentype);
cap(b,l,p,pentype);
}
bool drawPath::draw(psfile *out)
{
Int n = p.size();
if (n == 0 || pentype.invisible())
return true;
pen pen0=adjustdash(pentype,p.arclength(),p.cyclic());
penSave(out);
penTranslate(out);
out->write(p);
penConcat(out);
out->setpen(pen0);
out->stroke();
penRestore(out);
return true;
}
drawElement *drawPath::transformed(const transform& t)
{
return new drawPath(transpath(t), transpen(t));
}
} //namespace camp
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