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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"
using vm::array;
using vm::read;
namespace camp {
double PatternLength(double arclength, const array& pat,
bool cyclic, double penwidth)
{
double sum=0.0;
size_t n=pat.size();
for(unsigned i=0; i < n; i ++)
sum += read<double>(pat,i)*penwidth;
if(sum == 0.0) return 0.0;
if(n % 2 == 1) sum *= 2.0; // On/off pattern repeats after 2 cycles.
double pat0=read<double>(pat,0);
// Fix bounding box resolution problem. Example:
// asy -f pdf testlinetype; gv -scale -2 testlinetype.pdf
if(!cyclic && pat0 == 0) sum += 1.0e-3*penwidth;
double terminator=(cyclic && arclength >= 0.5*sum) ? 0.0 : pat0*penwidth;
int ncycle=(int)((arclength-terminator)/sum+0.5);
return (ncycle >= 1 || terminator >= 0.75*arclength) ?
ncycle*sum+terminator : 0.0;
}
bool isdashed(pen& p) {
const LineType *linetype=p.linetype();
size_t n=linetype->pattern.size();
return n > 0;
}
pen adjustdash(pen& p, double arclength, bool cyclic)
{
pen q=p;
// Adjust dash sizes to fit arclength; also compensate for linewidth.
const LineType *linetype=q.linetype();
size_t n=linetype->pattern.size();
if(n > 0) {
double penwidth=linetype->scale ? q.width() : 1.0;
double factor=penwidth;
if(linetype->adjust && arclength) {
double denom=PatternLength(arclength,linetype->pattern,cyclic,penwidth);
if(denom != 0.0) factor *= arclength/denom;
}
if(factor != 1.0)
q.adjust(max(factor,0.1));
}
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 == 0.0) return;
double numer=xx*yx+xy*yy;
double x=numer/y;
pair z=shift(T)*p.point(t);
switch(pentype.cap()) {
case SquareCap:
{
pair d=rotate(v)*pair(x,y)*h;
b += z+d;
b += z-d;
break;
}
case RoundCap:
{
b += pad(z,pentype.bounds());
break;
}
case ExtendedCap:
{
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;
}
}
}
// Account for square or extended pen cap contributions to bounding box.
void join(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 == 0.0) return;
double numer=xx*yx+xy*yy;
double x=numer/y;
pair z=shift(T)*p.point(t);
switch(pentype.join()) {
case MiterJoin:
{
double phi=angle(-p.predir(t),false)-angle(p.postdir(t),false);
static const double twopi=2.0*pi;
if(phi > pi) phi -= twopi;
if(phi < -pi) phi += twopi;
double s=sin(0.5*phi);
if(s != 0.0) {
double factor=1.0/s;
if(abs(factor) < pentype.miter()) {
b += z-rotate(v)*pair(x,y)*h*factor;
break;
}
}
// Fall through
}
case BevelJoin:
{
pair Z=pair(x,y)*h;
pair d=rotate(p.predir(t))*Z;
b += z+d;
b += z-d;
pair D=rotate(p.postdir(t))*Z;
b += z+D;
b += z-D;
break;
}
case RoundJoin:
{
b += pad(z,pentype.bounds());
break;
}
}
}
void drawPathPenBase::strokebounds(bbox& b, const path& p)
{
Int l=p.length();
if(l < 0) return;
b += p.internalbounds(pentype.bounds());
unsigned int n=p.size();
if(p.cyclic())
join(b,0,p,pentype);
for(unsigned int i=1; i < n-1; ++i)
join(b,i,p,pentype);
if(p.cyclic()) {
join(b,n-1,p,pentype);
} else {
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 q=isdashed(pentype) ?
adjustdash(pentype,
p.transformed(inverse(pentype.getTransform())).arclength(),
p.cyclic()) : pentype;
penSave(out);
penTranslate(out);
if(n > 1)
out->write(p);
else
out->dot(p,q);
penConcat(out);
out->setpen(q);
out->stroke(q,n == 1);
penRestore(out);
return true;
}
drawElement *drawPath::transformed(const transform& t)
{
return new drawPath(transpath(t),transpen(t),KEY);
}
} //namespace camp
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