painter.h

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/**********************************************************************
painter.h - Abstract base class for rendering

Copyright (C) 2009 by Tim Vandermeersch
Some portions Copyright (C) 2009 by Chris Morley

This file is part of the Open Babel project.
For more information, see <http://openbabel.org/>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation version 2 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
***********************************************************************/
#ifndef OB_PAINTER_H
#define OB_PAINTER_H

#include <openbabel/babelconfig.h>
#include <string>
#include <vector>
#include <sstream>
#ifndef OBDEPICT
  #define OBDEPICT
#endif

namespace OpenBabel
{
  struct OBDEPICT OBColor
  {
    OBColor()
    {
      *this = OBColor(0.0, 0.0, 0.0);
    }
    OBColor(double _red, double _green, double _blue, double _alpha = 1.0) :
        red(_red), green(_green), blue(_blue), alpha(_alpha)
    {
    }
    OBColor(const std::string &color)
    {
      if (color[0]=='#')
      {
        std::stringstream ss(color.substr(1));
        unsigned c;
        ss >> std::hex >> c;
        *this = OBColor((c/0x10000)/256.0, ((c%0x10000)/0x100/256.0), (c%0x100)/256.0);
      }
      if (color == "black")
        *this = OBColor(0.0, 0.0, 0.0);
      else if (color == "white")
        *this = OBColor(1.0, 1.0, 1.0);
      else if (color == "red")
        *this = OBColor(1.0, 0.0, 0.0);
      else if (color == "green")
        *this = OBColor(0.0, 1.0, 0.0);
      else if (color == "blue")
        *this = OBColor(0.0, 0.0, 1.0);
      else if (color == "yellow")
        *this = OBColor(1.0, 1.0, 0.0);
      else if (color == "gray")
        *this = OBColor(0.3, 0.3, 0.3);
      else if (color == "cyan")
        *this = OBColor(1.0, 0.0, 1.0);
      else if (color == "purple")
        *this = OBColor(0.5, 0.0, 0.5);
      else if (color == "teal")
        *this = OBColor(0.0, 0.5, 0.5);
      else if (color == "olive")
        *this = OBColor(0.5, 0.5, 0.0);
      else
        *this = OBColor(0.5, 0.5, 0.5);
    }

    OBColor(std::vector<double> vec) : red(vec[0]), green(vec[1]), blue(vec[2]), alpha(1.0){}

    bool operator !=(const OBColor& other)
    {
      return red!=other.red || green!=other.green || blue!=other.blue;
    }

    double red, green, blue, alpha;
  };

  struct OBDEPICT OBFontMetrics
  {
    int    fontSize;
    double ascent, descent;
    double width, height;
  };

  class OBDEPICT OBPainter
  {
    public:
      virtual ~OBPainter() {}

      virtual void NewCanvas(double width, double height) = 0;
      virtual bool IsGood() const = 0;
      virtual void SetFontFamily(const std::string &fontFamily) = 0;
      virtual void SetFontSize(int pointSize) = 0;
      virtual void SetFillColor(const OBColor &color) = 0;
      virtual void SetPenColor(const OBColor &color) = 0;
      virtual void SetPenWidth(double width) = 0;
      virtual void DrawLine(double x1, double y1, double x2, double y2) = 0;
      virtual void DrawCircle(double x, double y, double r) = 0;
      virtual void DrawPolygon(const std::vector<std::pair<double,double> > &points) = 0;
      virtual void DrawText(double x, double y, const std::string &text) = 0;
      virtual OBFontMetrics GetFontMetrics(const std::string &text) = 0;
  };

}

#endif