functions in button.i - B

 Button  
 
struct Button {  
  double x, y;      /* NDC coordinates of button center */  
  double dx, dy;    /* button half widths in NDC */  
  string text;      /* button text */  
  string font;      /* text font (0 for helvetica) */  
  double height;    /* text height */  
  double width;     /* width of line around button (0 is 1.0, <0 no box) */  
}  
structure, defined at i/button.i   line 12