1al_draw_soft_line(3)                                      al_draw_soft_line(3)
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NAME

6       al_draw_soft_line - Allegro 5 API
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SYNOPSIS

9              #include <allegro5/allegro_primitives.h>
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11              void al_draw_soft_line(ALLEGRO_VERTEX* v1, ALLEGRO_VERTEX* v2, uintptr_t state,
12                 void (*first)(uintptr_t, int, int, ALLEGRO_VERTEX*, ALLEGRO_VERTEX*),
13                 void (*step)(uintptr_t, int),
14                 void (*draw)(uintptr_t, int, int))
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DESCRIPTION

17       Draws  a  line  using  the  software rasterizer and user supplied pixel
18       functions.  For help in understanding what these functions do, see  the
19       implementation   of  the  various  shading  routines  in  addons/primi‐
20       tives/line_soft.c.  The line is drawn top to bottom.
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22       Parameters:
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24       · v1, v2 - The two vertices of the line
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26       · state - A pointer to a user supplied  struct,  this  struct  will  be
27         passed to all the pixel functions
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29       · first  -  Called  before  drawing the first pixel of the line.  It is
30         passed the coordinates of this pixel, as well  as  the  two  vertices
31         above.  The passed vertices may have been altered by clipping.
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33       · step  -  Called  once per pixel.  The second parameter is set to 1 if
34         the step is a minor step, and 0 if this step is a major step.   Minor
35         steps  are  taken  only either in x or y directions.  Major steps are
36         taken in both directions diagonally.  In all cases, the absolute val‐
37         ue of the change in coordinate is at most 1 in either direction.
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39       · draw  -  Called once per pixel.  The function is expected to draw the
40         pixel at the coordinates passed to it.
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SEE ALSO

43       al_draw_line(3)
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47Allegro reference manual                                  al_draw_soft_line(3)