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.TH "al_calculate_spline" "3" "" "Allegro reference manual"
.SH NAME
al_calculate_spline \- Allegro 5 API
.SH SYNOPSIS
.IP
.EX
#include \f[B]<allegro5/allegro_primitives.h>\f[R]

void al_calculate_spline(float* dest, int stride, const float points[8],
   float thickness, int num_segments)
.EE
.SH DESCRIPTION
Calculates a Bézier spline given 4 control points.
If \f[CR]thickness <= 0\f[R], then \f[CR]num_segments\f[R] 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[R]
.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
al_draw_spline(3), al_calculate_arc(3), al_calculate_ribbon(3)