04-05-2012
j is used for the (known) x coordinates, i is used for all (inter/extrpolated) coordinates, the left x-coordinate is called s and the right x-coordinate is t.
so this checks to see if a shift to use the next pair of coordinates is necessary and this is the case if i>t ( which means i>I[j+1] ) unless the coordinates we then would need to shift to (from I[j] and I[j+1] to I[j+1] and I[j+2]), do not exist. This will not be the case for I[j+1], but if I[j+2] does not exist, then we have reached the end of the array I.
If this is the case (then n lies to the right of the range of coordinates) then in fact we are switching automatically from interpolation to extrapolation. The same formula is used for extrapolation as for interpolation.
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LEARN ABOUT CENTOS
xcb_fill_poly_checked
xcb_fill_poly(3) XCB Requests xcb_fill_poly(3)
NAME
xcb_fill_poly -
SYNOPSIS
#include <xcb/xproto.h>
Request function
xcb_void_cookie_t xcb_fill_poly(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc, uint8_t shape, uint8_t coordinate_mode,
uint32_t points_len, const xcb_point_t *points);
REQUEST ARGUMENTS
conn The XCB connection to X11.
drawable TODO: NOT YET DOCUMENTED.
gc TODO: NOT YET DOCUMENTED.
shape One of the following values:
XCB_POLY_SHAPE_COMPLEX
TODO: NOT YET DOCUMENTED.
XCB_POLY_SHAPE_NONCONVEX
TODO: NOT YET DOCUMENTED.
XCB_POLY_SHAPE_CONVEX
TODO: NOT YET DOCUMENTED.
TODO: NOT YET DOCUMENTED.
coordinate_mode
One of the following values:
XCB_COORD_MODE_ORIGIN
Treats all coordinates as relative to the origin.
XCB_COORD_MODE_PREVIOUS
Treats all coordinates after the first as relative to the previous coordinate.
TODO: NOT YET DOCUMENTED.
points_len
One of the following values:
XCB_COORD_MODE_ORIGIN
Treats all coordinates as relative to the origin.
XCB_COORD_MODE_PREVIOUS
Treats all coordinates after the first as relative to the previous coordinate.
TODO: NOT YET DOCUMENTED.
points One of the following values:
XCB_COORD_MODE_ORIGIN
Treats all coordinates as relative to the origin.
XCB_COORD_MODE_PREVIOUS
Treats all coordinates after the first as relative to the previous coordinate.
TODO: NOT YET DOCUMENTED.
DESCRIPTION
RETURN VALUE
Returns an xcb_void_cookie_t. Errors (if any) have to be handled in the event loop.
If you want to handle errors directly with xcb_request_check instead, use xcb_fill_poly_checked. See xcb-requests(3) for details.
ERRORS
This request does never generate any errors.
SEE ALSO
AUTHOR
Generated from xproto.xml. Contact xcb@lists.freedesktop.org for corrections and improvements.
XCB
2014-06-10 xcb_fill_poly(3)