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.TH "al_calculate_spline" "3alleg5" "" "Allegro reference manual" ""
.hy
.SH NAME
.PP
al_calculate_spline \- Allegro 5 API
.SH SYNOPSIS
.IP
.nf
\f[C]
#include\ <allegro5/allegro_primitives.h>

void\ al_calculate_spline(float*\ dest,\ int\ stride,\ float\ points[8],
\ \ \ float\ thickness,\ int\ num_segments)
\f[]
.fi
.SH DESCRIPTION
.PP
Calculates a Bézier spline given 4 control points.
If \f[C]thickness\ <=\ 0\f[], then \f[C]num_segments\f[] of points are
required in the destination, otherwise twice as many are needed.
The destination buffer should consist of regularly spaced (by distance
of stride bytes) doublets of floats, corresponding to x and y
coordinates of the vertices.
.PP
\f[I]Parameters:\f[]
.IP \[bu] 2
dest \- The destination buffer
.IP \[bu] 2
stride \- Distance (in bytes) between starts of successive pairs of
coordinates
.IP \[bu] 2
points \- An array of 4 pairs of coordinates of the 4 control points
.IP \[bu] 2
thickness \- Thickness of the spline ribbon
.IP \[bu] 2
num_segments \- The number of points to calculate
.SH SEE ALSO
.PP
al_draw_spline(3alleg5), al_calculate_arc(3alleg5),
al_calculate_ribbon(3alleg5)