objects/oAlienEject/step.gml

From spelunky.gmk, Spelunky Classic 1.1's source, © 2008, 2009 Derek Yu and Mossmouth, LLC, shown whole under the Spelunky User License v1.1b. Extracted by spelunky.ai's tools, an unofficial fan project, one file per script or event; the // ==== lines are the extractor's, naming each action of the event. Some scripts are others' work that Derek Yu credits in the source's readme.txt: Martin Piecyk's platform engine, ChevyRay's view scaling scripts and tsg1zzn's Super Sound System.

oAlienEject's step event, 39 lines of GML.

if ((x > view_xview[0]-20 and x < view_xview[0] + view_wview[0]+4 and        y > view_yview[0]-20 and y < view_yview[0] + view_hview[0]+16)){x += xVel;y += yVel;if (status == EJECT){    xVel = 0;    yVel += 0.5;    if (yVel >= 0 or isCollisionTop(1))    {        yVel = 0;        status = FLOAT;        sprite_index = sAlienDeploy;    }    if (rand(1,5) == 1) instance_create(x+rand(0,3)-rand(0,3), y+rand(0,3)-rand(0,3), oBurn);}else if (status == FLOAT){    xVel = 0;    yVel = 2;    if (collision_point(x, y+6, oSolid, 0, 0))    {        instance_create(x-8, y-12, oAlien);        instance_destroy();    }    else if (dir == 0)    {        xVel = -1;        if (collision_point(x-8, y, oSolid, 0, 0)) dir = 99;    }    else if (dir == 1)    {        xVel = 1;        if (collision_point(x+8, y, oSolid, 0, 0)) dir = 99;    }}}