gmt-makemap/modules/gmt/modgmt_objects.h

#ifndef MODGMT_OBJECTS_H
#define MODGMT_OBJECTS_H
#include <cmath>
#include <map>
#include <string.h>
#include <type_traits>
#include <vector>
#include "common.h"
#include "modgmt_structs.h"

// Centimeters to GMT points scale factor
// 1 inch = 72 pt = 2.54 cm  -->  1 cm = 72/2.54 pt
// GMT's own scaling factor is 0.06
inline static double cm2GMT(double cm)
{
 static const double scale=(72.0/2.54)/0.06;
 return cm*scale;
}

template<class GMTStruct>
class ObjectGMTClass: public ObjectBase
{
 static_assert(std::is_base_of<gmt_struct,GMTStruct>::value,"Template parameter of ObjectGMTClass must be gmt_struct-derived type");
 const static std::string type;
 GMTStruct s;
 public:
 // Constructor
 ObjectGMTClass(const GMTStruct& n):s(n) {}
 // Pure virtual overrides
 ObjectBase* Copy() const override {return new ObjectGMTClass(s);}
 bool Print() const override
 {
  COUT(NORMAL)<<std::endl<<"Object type: "<<Type()<<std::endl;
  COUT(NORMAL)<<"Value: "<<Value()<<std::endl;
  return true;
 }
 std::string Type() const override {return type;}

 // Own functions
 ObjectBase* Get(const std::string& gname) const
 {
  std::string name=gname;
  tolower(name);
  if("value"==name) return new ObjectString(Value());
  return OGet(name);
 }
 std::string Value() const {return s.Value();}
 GMTStruct Data() const {return s;}

 private:
 // This is class-dependent Get function
 ObjectBase* OGet(const std::string& name) const {return 0;}
};


// GMTCoord
typedef ObjectGMTClass<struct gmt_coord> ObjectGMTCoord;
template<> inline ObjectBase* ObjectGMTCoord::OGet(const std::string& name) const
{
 if("n"==name || "number"==name) return new ObjectReal(s);
 return 0;
}

// GMTRegion
typedef ObjectGMTClass<struct gmt_region> ObjectGMTRegion;
template<> inline ObjectBase* ObjectGMTRegion::OGet(const std::string& name) const
{
 if("xb"==name)	return new ObjectGMTCoord(s.xb);
 if("xe"==name)	return new ObjectGMTCoord(s.xe);
 if("yb"==name)	return new ObjectGMTCoord(s.yb);
 if("ye"==name)	return new ObjectGMTCoord(s.ye);
 return 0;
}

// GMTProjection
typedef ObjectGMTClass<struct gmt_projection> ObjectGMTProjection;
template<> inline ObjectBase* ObjectGMTProjection::OGet(const std::string& name) const
{
 if("xb"==name)		return new ObjectGMTCoord(s.region.xb);
 if("xe"==name)		return new ObjectGMTCoord(s.region.xe);
 if("yb"==name)		return new ObjectGMTCoord(s.region.yb);
 if("ye"==name)		return new ObjectGMTCoord(s.region.ye);
 if("width"==name)	return new ObjectReal(s.rwidth);
 if("height"==name)	return new ObjectReal(s.rheight);
 if("region"==name)	return new ObjectGMTRegion(s.region);
 return 0;
}

// GMTColor
typedef ObjectGMTClass<struct gmt_color> ObjectGMTColor;
template<> inline ObjectBase* ObjectGMTColor::OGet(const std::string& name) const
{
 if("gray"==name || "grey"==name)	return new ObjectReal(s.Gray());
 if("r"==name || "red"==name)		return new ObjectReal(s.R());
 if("g"==name || "green"==name)		return new ObjectReal(s.G());
 if("b"==name || "blue"==name)		return new ObjectReal(s.B());
 if("h"==name || "hue"==name)		return new ObjectReal(s.H());
 if("s"==name || "saturation"==name)	return new ObjectReal(s.S());
 if("v"==name || "value"==name)		return new ObjectReal(s.V());
 if("c"==name || "cyan"==name)		return new ObjectReal(s.C());
 if("m"==name || "magenta"==name)	return new ObjectReal(s.M());
 if("y"==name || "yellow"==name)	return new ObjectReal(s.Y());
 if("k"==name || "black"==name)		return new ObjectReal(s.K());
 if("t"==name || "transparency"==name)	return new ObjectReal(s.transparency);
 return 0;
}

// GMTDash
typedef ObjectGMTClass<struct gmt_dash> ObjectGMTDash;

// GMTPen
typedef ObjectGMTClass<struct gmt_pen> ObjectGMTPen;
template<> inline ObjectBase* ObjectGMTPen::OGet(const std::string& name) const
{
 if("w"==name || "width"==name)	return new ObjectReal(s.width);
 if("c"==name || "color"==name)	return new ObjectGMTColor(s.color);
 if("d"==name || "dash"==name)	return new ObjectGMTDash(s.dash);
 return 0;
}


// GMTLayer
class ObjectGMTLayer: public ObjectBase
{
 double shiftx,shifty;
 struct gmt_projection proj;
 std::string creator;
 std::shared_ptr<std::string> data;

 ObjectGMTLayer() {}
 // This is saveable object
 virtual const int8_t* Blob(size_t* size) const override
 {
  if(Shifted())
  {
   std::string b="V "+ToString(cm2GMT(shiftx))+" "+ToString(cm2GMT(shifty))+" T\n";
   std::string e="U\n";
   int8_t* p=new int8_t[b.size()+data->size()+e.size()];
   memcpy(p,b.data(),b.size());
   memcpy(p+b.size(),data->data(),data->size());
   memcpy(p+b.size()+data->size(),e.data(),e.size());
   return p;
  }
  else
  {
   *size=data->size();
   return reinterpret_cast<const int8_t*>(data->data());
  }
 }
 virtual void DeallocBlob(const int8_t* ptr) const override
 {
  if(Shifted()) delete[] ptr;
 };
 public:
 // Constructor
 ObjectGMTLayer(const std::string& newdata, const struct gmt_projection& newproj, const std::string& newcreator, double newshiftx=0.0, double newshifty=0.0):shiftx(newshiftx),shifty(newshifty),proj(newproj),creator(newcreator)
 {
  std::string* pdata=new std::string(newdata.data(),newdata.length()); // To prevent COW
  data.reset(pdata);
 }
 // Pure virtual overrides
 ObjectBase* Copy() const override
 {
  auto ret=new ObjectGMTLayer;
  ret->shiftx=shiftx; ret->shifty=shifty;
  ret->proj=proj;
  ret->creator=creator;
  ret->data=data;

  return ret;
 }
 bool Print() const override
 {
  COUT(NORMAL)<<std::endl<<"Object type: "<<Type()<<std::endl;
  COUT(NORMAL)<<"Made by: "<<creator<<std::endl;
  COUT(NORMAL)<<"Size: "<<proj.rwidth<<"x"<<proj.rheight<<std::endl;
  if(Shifted()) COUT(NORMAL)<<"Shifted by: "<<shiftx<<"x"<<shifty<<std::endl;
  return true;
 }
 std::string Type() const override {return "GMTLayer";}

 // Own functions
 ObjectBase* Get(const std::string& gname) const
 {
  std::string name=gname;
  tolower(name);
  if("proj"==name || "projection"==name)	return new ObjectGMTProjection(proj);
  if("w"==name || "width"==name)		return new ObjectReal(proj.rwidth);
  if("h"==name || "height"==name)		return new ObjectReal(proj.rheight);
  if("shiftx"==name)				return new ObjectReal(shiftx);
  if("shifty"==name)				return new ObjectReal(shifty);
  return 0;
 }
 bool Shifted() const {return shiftx!=0.0 || shifty!=0.0;}
};
#endif