//////////////////This program is written by Lutz Tautenhahn, Chemnitz 1995.
////////////////////////////////You may use this code for your own purposes.
////////////////////////////////There are no conditions and no restrictions.

#define  StringLength 20
enum boolean {false, true};

class LTDiagram      
{ public:

    LTDiagram(double theLeftX   = 0.0, 
              double theRightX  = 1.0,
              double theBottomY = 0.0,
              double theTopY    = 1.0,
              int    theLeft    = 80,
              int    theTop     = 40,
              int    theRight   = 600,
              int    theBotttom = 440,
              void*  theScaleX  = "X",   
              void*  theScaleY  = "Y",   
              void*  theTitle   = "");              
              
              
    void SetFrame (int theLeft, int theTop, 
                   int theRight, int theBottom);
    void SetBorder(double theLeftX, double theRightX, 
                   double theBottomY, double theTopY);
     
    void SetText(void* theScaleX, void* theScaleY, void* theTitle);
    int ScreenX(double theRealX);
    int ScreenY(double theRealY);
    double RealX(int theScreenX);
    double RealY(int theScreenY);
    void Draw(int DrawColor = 8, 
              int TextColor = 15, 
              int ZeroColor = 4,
              boolean isGrid  = true, 
              boolean isScaleText = true);   
  private:            

    int sign(double rr);
    int round(double rr);
    int MinLength(double theValue);

    double  xmin, xmax, ymin, ymax;
    int right, left, bottom, top;
    char xtext[StringLength], ytext[StringLength];
    char title[60];      
};