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// The output class: almost pure virtual (a protocol class), but
// see some definitions in object.cc.
struct line_type
{
enum { invisible, solid, dotted, dashed } type;
double dash_width; // or inter-dot spacing, for dotted lines
double thickness; // line thickness in points
// ctor
line_type();
};
class output
{
public:
// ctor, dtor
output();
virtual ~output();
// interface: implemented in toto in each concrete output class
virtual void start_picture (double sc, const position &ll, const position &ur) = 0;
virtual void finish_picture (void) = 0;
virtual void arc (const position &start, const position ¢,
const position &end, const line_type <) = 0;
virtual void circle (const position ¢, double rad,
const line_type <, double fill) = 0;
virtual void ellipse (const position ¢, const distance &dim,
const line_type <, double fill) = 0;
virtual void line (const position &start, const position *v, int n,
const line_type <) = 0;
virtual void polygon (const position *v, int n,
const line_type <, double fill) = 0;
virtual void spline (const position &start, const position *v, int n,
const line_type <) = 0;
virtual void text (const position ¢er, text_piece *v, int n,
double angle) = 0;
virtual void rounded_box (const position ¢, const distance &dim,
double rad, const line_type <, double fill) = 0;
// no-ops, can optionally be overridden
virtual void command (const char *s, const char *filename, int lineno);
virtual void set_location (const char *filename, int lineno);
// returns 0 (false), can optionally be overridden
virtual int supports_filled_polygons (void);
// no-ops; can optionally be overridden
virtual void begin_block (const position &ll, const position &ur);
virtual void end_block (void);
// not overridable; related to scaling
void set_desired_width_height (double wid, double ht);
void set_args (const char *);
protected:
char *args;
double desired_height; // zero if no height specified
double desired_width; // zero if no depth specified
double compute_scale (double sc, const position &ll, const position &ur);
};
// A global; we have only one of these. Its member function are what do
// the output of objects of various kinds (they're invoked by the
// objects' `print' operations). Defined in main.cc.
extern output *out;
#define TROFF_SUPPORT 0
#define TEX_SUPPORT 0
#define PLOT_SUPPORT 1
#ifdef TROFF_SUPPORT
output *make_troff_output (void);
#endif
#ifdef TEX_SUPPORT
output *make_tex_output (void);
output *make_tpic_output (void);
#endif
#ifdef PLOT_SUPPORT
output *make_plot_output (void);
extern char *output_format;
extern char *font_name;
extern char *pen_color_name;
extern double font_size;
extern double line_width;
extern int precision_dashing;
#endif
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