objects/oAlienBoss/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.

oAlienBoss's step event, 87 lines of GML.

if (x > view_xview[0]-36 and x < view_xview[0] + view_wview[0] and        y > view_yview[0]-36 and y < view_yview[0] + view_hview[0]){if (collision_point(x+8, y+8, oSolid, 0, 0)){    hp = 0;}if (hp < 1 and status != DEAD){    status = DEAD;    sprite_index = sAlienBossDie;    depth = 101;    repeat(4)    {        n = rand(1,3);        switch (n)        {            case 1: { gem = instance_create(x+16, y+16, oEmeraldBig); break; }            case 2: { gem = instance_create(x+16, y+16, oSapphireBig); break; }            case 3: { gem = instance_create(x+16, y+16, oRubyBig); break; }        }        gem.xVel = rand(0,3) - rand(0,3);        gem.yVel = -2;    }    if (countsAsKill)    {        if (isRealLevel()) global.enemyKills[17] += 1;        global.alienbosses += 1;        global.kills += 1;    }}if (sprite_index == sAlienBossDie){    if (rand(1,2) == 1)    {        scrCreateBlood(x+8, y+rand(14,18), 1);        blood = instance_create(x+8, y+rand(14,18), oBlood);    }}yVel += myGrav;if (yVel > yVelLimit) yVel = yVelLimit;if (xVel > 0) xVel -= 0.1;if (xVel < 0) xVel += 0.1;if (abs(xVel) < 0.5) xVel = 0;if (isCollisionBottom(1) and status != STUNNED)    yVel = 0;if (status == IDLE){    xVel = 0;}moveTo(xVel,yVel);if (isCollisionSolid())    y -= 2;    dist = distance_to_object(oPlayer1);if (psychicRecover > 0) psychicRecover -= 1;else if (dist < 96 and status != DEAD and not oPlayer1.dead and not oPlayer1.stunned and oPlayer1.invincible == 0){    for (i = 0; i < 6; i += 1)    {        instance_create(x+16+rand(0,32)-rand(0,32), y+16+rand(0,32)-rand(0,32), oPsychicCreate);    }    instance_create(x+16, y+16, oPsychicWave);    psychicRecover = 100;    playSound(global.sndPsychic);}if (sprite_index != sAlienBossHurt) image_speed = 0.25;        if (status != DEAD and sprite_index != sAlienBossHurt and facing == LEFT){    sprite_index = sAlienBoss;}if (status != DEAD and sprite_index != sAlienBossHurt and facing == RIGHT){    sprite_index = sAlienBoss;}}