al_calculate_arc man page on DragonFly

al_calculate_arc man page on DragonFly

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al_calculate_arc(3)					   al_calculate_arc(3)

NAME
       al_calculate_arc - Allegro 5 API

SYNOPSIS
	      #include <allegro5/allegro_primitives.h>

	      void al_calculate_arc(float* dest, int stride, float cx, float cy,
		 float rx, float ry, float start_theta, float delta_theta, float thickness,
		 int num_segments)

DESCRIPTION
       Calculates  an elliptical arc, and sets the vertices in the destination
       buffer to the calculated positions.  If thickness <= 0, then num_points
       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.

       Parameters:

       · dest - The destination buffer

       · stride - Distance (in bytes) between starts of	 successive  pairs  of
	 coordinates

       · cx, cy - Center of the arc

       · rx, ry - Radii of the arc

       · start_theta - The initial angle from which the arc is calculated

       · delta_theta  -	 Angular  span	of  the arc (pass a negative number to
	 switch direction)

       · thickness - Thickness of the arc

       · num_points - The number of points to calculate

SEE ALSO
       al_draw_arc(3), al_calculate_spline(3), al_calculate_ribbon(3)

Allegro reference manual				   al_calculate_arc(3)

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