space ship sprite generator

// random_ship(width,height)
xsize=argument0;
ysize=argument1;

EMPY=0
SOLID=1
COKPT=2

for(xx=0;xx<xsize/2;xx+=1)
{
for(yy=0;yy<ysize;yy+=1)
{
pixel[xx,yy]=EMPY
}
}
pixel[xsize/2,3]=SOLID
pixel[xsize/2,4]=SOLID
pixel[xsize/2,5]=SOLID
pixel[xsize/2,6]=SOLID
pixel[xsize/2,10]=SOLID

for(xx=0;xx<xsize/2;xx+=1)
{
for(yy=0;yy<ysize;yy+=1)
{
if pixel[xx,yy]=EMPY
{pixel[xx,yy]=choose(EMPY,SOLID);}
}
}

// SPRITE :
draw_set_alpha(1)
draw_set_color(c_white);
draw_rectangle(-1,-1,xsize+2,ysize+2,0);
draw_set_color(0);

for(xx=0;xx<xsize/2;xx+=1)
{
for(yy=0;yy<ysize;yy+=1)
{
if pixel[xx,yy]=SOLID
{draw_point(xx+1,yy+1);draw_point(xsize/2+(xsize/2-xx),yy+1);}
}
}

return sprite_create_from_screen(0,0,xsize+2,ysize+2,1,0,xsize/2,ysize/2);