GraphFont.h

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// GraphFont.h

/*************************************************************/
//
// CGraphFont
//
// Draw antialiased fonts
//
//-------------------------------------------------------------
//
// v 1.7 - 2007/05/31 - Fix for 64bit Linux and correct-rounding return length
// v 1.6 - 2007/04/04 - Smaller font size for tick numbers
// v 1.5 - 2007/03/14 - Fixed single spaces in Cairo
// v 1.4 - 2007/02/17 - Cairo font handling
// v 1.3 - 2007/01/06 - Precision padding of numbers
// v 1.2 - 2006/08/27 - Overloaded with doubles than round near zero
// v 1.1 - 2006/07/07 - Super- and sub-script fonts
// v 1.0 - 2006/04/19 - Initial release
//
// See LICENSE.txt for distribution and usage restrictions
// Copyright (c) 2005-2007 Simon Chorley
// www.mylaboratory.co.uk - greylab@mylaboratory.co.uk
//
/*************************************************************/


///Graph font (Definition)
/**
 * Provides CGraphFont class to draw text onto the graphs. Allows superscript, subscript and greek letters.
 * @file GraphFont.h
 * @version 1.7 - 2007/05/31
 */


#ifndef _GRAPHFONT_H_
#define _GRAPHFONT_H_


#include <fx.h>


#ifdef CAIROGRAPHICS
#include <cairo.h>
#endif


///Graph font drawing class
/**
 * Maintains the fonts and handles drawing strings onto FXDC surfaces.
 */
class CGraphFont
{
private:
        FXFont *textFont;       ///<Text font
        FXFont *symFont;        ///<Symbol font
        FXFont *textSFont;      ///<Text sup/sub font
        FXFont *symSFont;       ///<Symbol sup/sub font
        FXFont *numFont;        ///<Number font (slightly different size)
        int fontbaseline;
        int fontSupbaseline;
        int fontSubbaseline;
        int numfontbaseline;
        float fontkernel[3][3]; ///<Gaussian AA kernel
        bool aamethod;  ///<Antialiasing method: true == HQ, false == LQ
        float numfactor;        ///<Number font enlargement factor

#ifdef CAIROGRAPHICS
        float cairofontraise;
        float cairofontlower;

//      cairo_font_options_t *c_font;
#endif

        FXApp *app;             ///<Application object pointer

        FXString doubleToString(double d);
        FXString preciseString(double d, int precision);

public:
        CGraphFont();
        ~CGraphFont();

        FXFontDesc textFontdesc;
        FXFontDesc symFontdesc;
        int fontheight;
        int numfontheight;

        void buildFont(FXApp *a, bool hqaa, float nummultiplier);       //initialise using antialiasing mode

        int getPrecision(double d);

        int getStringDimensions(FXString txt);  //return dimensions of the specified string
        FXColor* drawAAString(FXString txt, int &length);       //Draw a string to an array of FXColor and return pointer
        float* drawAAStringf(FXString txt, int &length);

        //Zero rouunding verions of the above functions
        int getStringDimensions(double d, int precision = 0);   //return dimensions of the specified string
        FXColor* drawAAString(double d, int &length, int precision = 0);        //Draw a string to an array of FXColor and return pointer
        float* drawAAStringf(double d, int &length, int precision = 0);

#ifdef CAIROGRAPHICS
        float cairofontheight;
        float cairobaselineheight;
        float caironumfontheight;

        void initCairoMeasurements(cairo_t *c);

        float getStringDimensions(cairo_t *c, FXString txt);    //return dimensions of the specified string
        float getStringDimensions(cairo_t *c, double d, int precision = 0);     //return dimensions of the specified string
        void drawString(cairo_t *c, float x, float y, FXString txt);
        void drawString(cairo_t *c, float x, float y, double d, int precision = 0);     //Draw a string
#endif
};

#endif

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