Lines

To draw a single line, pass its endpoints as arguments to gdk_draw_line() (Figure 18). To draw connected lines, you pass a list of points to gdk_draw_lines(); GDK will "connect the dots." To draw multiple lines that aren't necessarily connected, pass a list of segments to gdk_draw_segments(); a GdkSegment is:

typedef struct _GdkSegment GdkSegment;

struct _GdkSegment
{
  gint16 x1;
  gint16 y1;
  gint16 x2;
  gint16 y2;
};

If lines or segments drawn in the same request meet at their endpoints, they are joined with the join style from the GC.

#include <gdk/gdk.h>