scripts/scrShake.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.
The script scrShake, 10 lines of GML.
//// scrShake(duration)//// Shake the screen.//if (global.shake < argument0) global.shake = argument0;if (global.shake < 0) global.shake = 0;global.xview = view_xview;global.yview = view_yview;