/*****
* drawfill.h
* Andy Hammerlindl 2002/06/06
*
* Stores a cyclic path that will outline a filled shape in a picture.
*****/

#ifndef DRAWFILL_H
#define DRAWFILL_H

#include "drawelement.h"
#include "path.h"

namespace camp {

class drawFill : public drawSuperPathPenBase {
protected:
 bool stroke;
public:
 void noncyclic() {
   reportError("non-cyclic path cannot be filled");
 }

 drawFill(const vm::array& src, bool stroke, pen pentype,
          const string& key="") :
   drawElement(key), drawSuperPathPenBase(src,pentype), stroke(stroke) {
   if(!stroke && !cyclic()) noncyclic();
 }

 bool svg() {return true;}

 // dvisvgm doesn't yet support SVG patterns.
 bool svgpng() {return pentype.fillpattern() != "";}

 virtual ~drawFill() {}

 virtual bool draw(psfile *out);

 virtual void palette(psfile *out) {
   penSave(out);
   penTranslate(out);
 }
 virtual void fill(psfile *out) {
   out->setpen(pentype);
   if(stroke) out->strokepath();
   out->fill(pentype);
   penRestore(out);
 };

 drawElement *transformed(const transform& t);
};

class drawShade : public drawFill {
public:
 drawShade(const vm::array& src, bool stroke, pen pentype,
           const string& key="")
   : drawFill(src,stroke,pentype,key) {}

 void bounds(bbox& b, iopipestream& iopipe, boxvector& vbox,
             bboxlist& bboxstack) {
   if(stroke) strokebounds(b);
   else drawSuperPathPenBase::bounds(b,iopipe,vbox,bboxstack);
 }

 bool pdf() {
   return settings::pdf(settings::getSetting<string>("tex"));
 }

 // Shading in SVG is incomplete and not supported at all by dvisvgm --pdf.
 bool svgpng() {return true;}

 virtual void beginshade(psfile *out)=0;
 virtual void shade(psfile *out)=0;

 bool draw(psfile *out) {
   if(pentype.invisible() || empty()) return true;

   palette(out);
   beginshade(out);
   writeclippath(out);
   if(stroke) strokepath(out);
   out->endpsclip(pentype.Fillrule());
   shade(out);
   out->grestore();
   return true;
 }
};

class drawLatticeShade : public drawShade {
protected:
 vm::array pens;
 const transform T;
public:
 drawLatticeShade(const vm::array& src, bool stroke,
                  pen pentype, const vm::array& pens,
                  const camp::transform& T=identity, const string& key="")
   : drawShade(src,stroke,pentype,key), pens(pens), T(T) {}

 void palette(psfile *out) {
   out->gsave();
 }

 void beginshade(psfile *out) {
   out->beginlatticeshade(pens,bpath);
 }

 void shade(psfile *out) {
   bbox b;
   for(size_t i=0; i < size; i++) {
     path p=vm::read<path>(P,i).transformed(inverse(T));
     if(stroke)
       drawPathPenBase::strokebounds(b,p);
     else
       b += p.bounds();
   }
   out->latticeshade(pens,T*matrix(b.Min(),b.Max()));
 }

 drawElement *transformed(const transform& t);
};

class drawAxialShade : public drawShade {
protected:
 pair a;
 bool extenda;
 pen penb;
 pair b;
 bool extendb;
 ColorSpace colorspace;
public:
 drawAxialShade(const vm::array& src, bool stroke,
                pen pentype, pair a, bool extenda, pen penb, pair b,
                bool extendb, const string& key="")
   : drawShade(src,stroke,pentype,key), a(a), extenda(extenda),
     penb(penb), b(b), extendb(extendb) {}

 bool svgpng() {return !extenda || !extendb || pdf();}

 void palette(psfile *out);

 void beginshade(psfile *out) {
   out->begingradientshade(true,colorspace,pentype,a,0,penb,b,0);
 }

 void shade(psfile *out) {
   out->gradientshade(true,colorspace,pentype,a,0,extenda,penb,b,0,extendb);
 }

 drawElement *transformed(const transform& t);
};

class drawRadialShade : public drawAxialShade {
protected:
 double ra;
 double rb;
public:
 drawRadialShade(const vm::array& src, bool stroke,
                 pen pentype, pair a, double ra, bool extenda, pen penb,
                 pair b, double rb, bool extendb, const string& key="")
   : drawAxialShade(src,stroke,pentype,a,extenda,penb,b,
                    extendb,key), ra(ra), rb(rb) {}

 bool svgpng() {return a != b || ra > 0.0 || !extenda || !extendb || pdf();}

 void beginshade(psfile *out) {
   out->begingradientshade(false,colorspace,pentype,a,ra,penb,b,rb);
 }

 void shade(psfile *out) {
   out->gradientshade(false,colorspace,pentype,a,ra,extenda,penb,b,rb,extendb);
 }

 drawElement *transformed(const transform& t);
};

class drawGouraudShade : public drawShade {
protected:
 vm::array pens,vertices,edges;
public:
 drawGouraudShade(const vm::array& src, bool stroke,
                  pen pentype, const vm::array& pens,
                  const vm::array& vertices, const vm::array& edges,
                  const string& key="")
   : drawElement(key), drawShade(src,stroke,pentype,key), pens(pens),
     vertices(vertices), edges(edges) {}

 bool svgpng() {return settings::xasy || !settings::getSetting<bool>("svgemulation") || pdf();}

 void palette(psfile *out) {
   out->gsave();
 }

 void beginshade(psfile *out) {
   out->begingouraudshade(pens,vertices,edges);
 }

 void shade(psfile *out) {
   out->gouraudshade(pentype,pens,vertices,edges);
 }

 drawElement *transformed(const transform& t);
};

class drawTensorShade : public drawShade {
protected:
 vm::array pens,boundaries,z;
public:
 drawTensorShade(const vm::array& src, bool stroke,
                 pen pentype, const vm::array& pens,
                 const vm::array& boundaries, const vm::array& z,
                 const string& key="") :
   drawShade(src,stroke,pentype,key), pens(pens), boundaries(boundaries),
   z(z) {
 }

 void palette(psfile *out) {
   out->gsave();
 }

 void beginshade(psfile *out) {}

 void shade(psfile *out) {
   out->tensorshade(pentype,pens,boundaries,z);
 }

 drawElement *transformed(const transform& t);
};

class drawFunctionShade : public drawFill {
protected:
 string shader;
public:
 drawFunctionShade(const vm::array& src, bool stroke,
                   pen pentype, const string& shader, const string& key="")
   : drawFill(src,stroke,pentype,key), shader(shader) {
   string texengine=settings::getSetting<string>("tex");
   if(!settings::pdf(texengine))
     reportError("functionshade is not implemented for the '"+texengine+
                 "' tex engine");
 }

 virtual ~drawFunctionShade() {}

 bool draw(psfile *out) {return false;}

 bool write(texfile *, const bbox&);

 bool islabel() {return true;}

 drawElement *transformed(const transform& t);
};

}

#endif

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