1al_calculate_spline(3)     Library Functions Manual     al_calculate_spline(3)
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NAME

6       al_calculate_spline
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SYNOPSIS

9              #include <allegro5/allegro_primitives.h>
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11              void al_calculate_spline(float* dest, int stride, float points[8],
12                 float thickness, int num_segments)
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DESCRIPTION

15       Calculates  a Bézier spline given 4 control points.  If thickness <= 0,
16       then num_segments of points are required in the destination,  otherwise
17       twice  as  many  are  needed.  The destination buffer should consist of
18       regularly spaced (by distance of stride bytes) doublets of floats, cor‐
19       responding to x and y coordinates of the vertices.
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21       Parameters:
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23       · dest - The destination buffer
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25       · stride  -  Distance  (in bytes) between starts of successive pairs of
26         coordinates
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28       · points - An array of 4 pairs of coordinates of the 4 control points
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30       · thickness - Thickness of the spline ribbon
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32       · num_segments - The number of points to calculate
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SEE ALSO

35       al_draw_spline(3), al_calculate_arc(3), al_calculate_ribbon(3)
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39Allegro reference manual                                al_calculate_spline(3)