scripts/isCollisionLadder.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 isCollisionLadder, 10 lines of GML.
/*Returns whether the object invoking this script is colliding with a ladder.return0:no collision1:collision*/calculateCollisionBounds()if (collision_rectangle(lb+8,tb+8,rb-8,bb-8,oLadderTop,1,1) > 0) return true;else return collision_rectangle(lb+8,tb+8,rb-8,bb-8,oLadder,1,1)>0