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Full Discussion: Interpolation using awk
Top Forums Shell Programming and Scripting Interpolation using awk Post 302619093 by Scrutinizer on Thursday 5th of April 2012 12:07:11 AM
Old 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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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)
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