/*

SCRIPT:
fog(x,y,sprite,color);


ARGUMENTS:
argument0: x of the middle of the fog
argument1: y of the middle of the fog
argument2: sprite of the fog (orgin needs to be set in the center of the sprite)
argument3: color outside the visible part and its fogsprite


EXAMPLE:
fog(mouse_x,mouse_y,spr_fog,c_black);


EVENT:
draw event!


CREDITS:
Please give credits to Bjarno from bjarno.be. Thanks :)


DISCLAIMER:
PLEASE DO NOT CHANGE ANYTHING EXCEPT IF YOU KNOW WHAT YOU ARE DOING!

*/

var maxvalue, fogcenter_x, fogcenter_y, fog_sprite, fog_width, fog_height, oldcolor, oldalpha, fog_color;

//global settings
maxvalue = 2000;

//convert arguments to vars
fogcenter_x = argument0;
fogcenter_y = argument1;
fog_sprite = argument2;
fog_color = argument3;

//get draw values (color & alpha)
oldcolor = draw_get_color();
oldalpha = draw_get_alpha();

//get size of the fogsprite
fog_width = sprite_get_width(fog_sprite);
fog_height = sprite_get_height(fog_sprite);

//set the color and the alpha
draw_set_color(fog_color);
draw_set_alpha(1);

//draw rectangles
draw_rectangle(
fogcenter_x-fog_width/2-maxvalue,
fogcenter_y-fog_height/2-maxvalue,
fogcenter_x+fog_width/2+maxvalue,
fogcenter_y-fog_height/2,
false);

draw_rectangle(
fogcenter_x-fog_width/2-maxvalue,
fogcenter_y+fog_height/2,
fogcenter_x+fog_width/2+maxvalue,
fogcenter_y+fog_height/2+maxvalue,
false);

draw_rectangle(
fogcenter_x-fog_width/2-maxvalue,
fogcenter_y-fog_height/2-maxvalue,
fogcenter_x-fog_width/2,
fogcenter_y+fog_height/2,
false);

draw_rectangle(
fogcenter_x+fog_width/2,
fogcenter_y-fog_height/2,
fogcenter_x+fog_width/2+maxvalue,
fogcenter_y+fog_height/2,
false);


//draw fogsprite
draw_sprite(fog_sprite,-1,fogcenter_x,fogcenter_y);

//reset draw values
draw_set_alpha(oldalpha);
draw_set_color(oldcolor);