-
- const double start_x = x0 - radius * sin(start_angle);
- const double start_y = y0 + radius * cos(start_angle);
-
- const double stop_x =
- x0 - radius * sin(start_angle + segment_angle);
-
- const double stop_y =
- y0 + radius * cos(start_angle + segment_angle);
-
- assert(segment_angle <= 2 * M_PI);
- assert(segment_angle >= 0);
-
- if ( segment_angle > M_PI )
- {
- /* Then we must draw it in two halves */
- fill_segment(ch, x0, y0, radius, start_angle, segment_angle / 2.0 );
- fill_segment(ch, x0, y0, radius, start_angle + segment_angle / 2.0,
- segment_angle / 2.0 );
- }
- else
- {
- pl_move_r(ch->lp, x0, y0);
-
- pl_cont_r(ch->lp, stop_x, stop_y);
- pl_cont_r(ch->lp, start_x, start_y);
-
- pl_arc_r(ch->lp,
- x0, y0,
- stop_x, stop_y,
- start_x, start_y
- );
-
- pl_endpath_r(ch->lp);
- }
+ cairo_move_to (cr, x0, y0);
+ cairo_arc (cr, x0, y0, radius, start_angle, start_angle + segment_angle);
+ cairo_line_to (cr, x0, y0);
+ cairo_save (cr);
+ cairo_set_source_rgb (cr,
+ colour->red / 255.0,
+ colour->green / 255.0,
+ colour->blue / 255.0);
+ cairo_fill_preserve (cr);
+ cairo_restore (cr);
+ cairo_stroke (cr);