cairo samples

 arc
 arc_negative
 clip
 clip_image
 curve_rectangle
 curve_to
 fill_and_stroke2
 fill_and_stroke
 gradient
 image
 imagepattern
 libsvg
 operator_add
 operator_atop
 operator_atop_reverse
 operator_in
 operator_in_reverse
 operator_out
 operator_out_reverse
 operator_over
 operator_over_reverse
 operator_saturate
 operator_xor
 path
 set_line_cap
 set_line_join
 text_align_center
 text
 text_extents
 xxx_clip_rectangle
 xxx_dash
 xxx_long_lines
 xxx_multi_segment_caps
 xxx_self_intersect
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cairo_set_line_width (cr, 0.12);
cairo_set_line_cap  (cr, CAIRO_LINE_CAP_BUTT); /* default */
cairo_move_to (cr, 0.25, 0.2); cairo_line_to (cr, 0.25, 0.8);
cairo_stroke (cr);
cairo_set_line_cap  (cr, CAIRO_LINE_CAP_ROUND);
cairo_move_to (cr, 0.5, 0.2); cairo_line_to (cr, 0.5, 0.8);
cairo_stroke (cr);
cairo_set_line_cap  (cr, CAIRO_LINE_CAP_SQUARE);
cairo_move_to (cr, 0.75, 0.2); cairo_line_to (cr, 0.75, 0.8);
cairo_stroke (cr);

/* draw helping lines */
cairo_set_rgb_color (cr, 1,0.2,0.2);
cairo_set_line_width (cr, 0.01);
cairo_move_to (cr, 0.25, 0.2); cairo_line_to (cr, 0.25, 0.8);
cairo_move_to (cr, 0.5, 0.2);  cairo_line_to (cr, 0.5, 0.8);
cairo_move_to (cr, 0.75, 0.2); cairo_line_to (cr, 0.75, 0.8);
cairo_stroke (cr);