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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, const float points[8],
   float thickness, int num_segments)
\f[R]
.fi
.SH DESCRIPTION
.PP
Calculates a Bézier spline given 4 control points.
If \f[V]thickness <= 0\f[R], then \f[V]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
.PP
al_draw_spline(3alleg5), al_calculate_arc(3alleg5),
al_calculate_ribbon(3alleg5)