objects/oBigTreasure/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.

oBigTreasure's step event, 49 lines of GML.

if (true){    x += xVel;    y += yVel;    if (yVel < 6)    {        yVel += myGrav;    }        if (isCollisionTop(1) and yVel < 0)    {        yVel = -yVel * 0.8;    }        if (isCollisionLeft(1) or isCollisionRight(1))    {        xVel = -xVel * 0.5;    }        if (isCollisionBottom(1))    {        if (yVel > 5)        {            poof = instance_create(x+16-4, y+30, oPoof);            with poof { xVel = -0.4; }            poof = instance_create(x+16+4, y+30, oPoof);            with poof { xVel = 0.4; }            playSound(global.sndThump);        }            // bounce        if (yVel > 1) yVel = -yVel * 0.5;        else        {            yVel = 0;        }                // friction        if (abs(xVel) < 0.1) xVel = 0;        else if (abs(xVel) != 0) xVel *= 0.3;    }        if (isCollisionBottom(0) and abs(yVel) < 1)    {        y -= 1;        yVel = 0;    }}