Ramu 0.7b doc
Spritesheet.setSheet()
Description
Set the sheet of the Spritesheet position.
You can test this snippet of code here.
let img = Ramu.Utils.getImage("https://i.imgur.com/E0Z8YMr.png");
let rec = new Rect(0, 50, 59, 20);
let sh = new Spritesheet(img, rec, 10, 10, 59, 50, true);
sh.update = function(){
if (keyCode.w in Ramu.lastKeysPressed){
this.setSheet(new Rect(0,0,59,70));
}
};