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Button |
     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