extrans(3)                      Allegro manual                      extrans(3)



NAME
       extrans - Lighting and translucency effects. Allegro game programming
       library.

SYNOPSIS
       #include <allegro.h>


       Example extrans

DESCRIPTION
       This program demonstrates how to use the lighting and translucency
       functions. The first part of the example will show a dark screen
       illuminated by a spotlight you can move with your mouse. After a key
       press the example shows the full bitmap and the spotlight changes to be
       a reduced version of the background with 50% of translucency.

       The translucency effect is easy to do in all color depths.  However,
       the lighting effect has to be performed in a different way depending on
       whether the screen is in 8bit mode or another color depth. This is
       because additive drawing mode uses a different set of routines for
       truecolor modes.


SEE ALSO
       BITMAP(3), COLOR_MAP(3), END_OF_MAIN(3), PALETTE(3), RGB(3),
       RGB_MAP(3), SCREEN_H(3), SCREEN_W(3), allegro_error(3),
       allegro_init(3), allegro_message(3), bitmap_color_depth(3), blit(3),
       circlefill(3), clear_bitmap(3), clear_keybuf(3), color_map(3),
       create_bitmap(3), create_bitmap_ex(3), create_light_table(3),
       create_rgb_table(3), create_trans_table(3), destroy_bitmap(3),
       draw_trans_sprite(3), drawing_mode(3), install_keyboard(3),
       install_mouse(3), install_timer(3), keypressed(3), load_bitmap(3),
       mouse_x(3), mouse_y(3), poll_mouse(3), rectfill(3),
       replace_filename(3), rest(3), rgb_map(3), screen(3),
       set_alpha_blender(3), set_gfx_mode(3), set_palette(3),
       set_trans_blender(3), set_write_alpha_blender(3), stretch_blit(3)



Allegro                          version 4.2.3                      extrans(3)
