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   1  /*
   2   * see COPYRIGHT
   3   */
   4  
   5  
   6  /*
   7   * Screen for drawing the Bezier curves in text mode
   8   */
   9  
  10  struct screen {
  11      unsigned physx;
  12      unsigned physy;
  13      unsigned cols;
  14      unsigned rows;
  15      unsigned xoff;
  16      unsigned yoff;
  17      unsigned minx;
  18      unsigned miny;
  19      char *dots;
  20      double xscale;
  21      double yscale;
  22  } screen;
  23  
  24  #define screenabsdot(x,y)    (screen.dots[(y)*screen.cols+(x)])
  25  #define screendot(x,y)    screenabsdot((x)+screen.xoff, (y)+screen.yoff)
  26  
  27  /* prototypes */
  28  double fmin(double a, double b);
  29  int abs(int x);
  30  void initscreen(unsigned physx, unsigned physy, 
  31      unsigned cols, unsigned rows, unsigned xoff, unsigned yoff, 
  32      unsigned minx, unsigned miny, unsigned maxx, unsigned maxy);
  33  void drawcurve(int mark, int ax,int ay, 
  34      int bx,int by, int cx,int cy, int dx,int dy);
  35  void drawcurvedir(int mark, int ax,int ay, 
  36      int bx,int by, int cx,int cy, int dx,int dy);
  37  void drawdot(int mark, int x, int y);
  38  void setabsdot(int mark, int x, int y);
  39  void setfdot(int mark, double x, double y);
  40  void printscreen(FILE *f);