addRevoluteJoint(param);
param
extends BodyActor; addRevoluteJoint{x:300,y:200,lowerAngle:-30,upperAngle:30}; while(true) { if(getkey(32)) applyImpulse(0,-30); update(); }
new Flipper{x:200,y:200,scaleX:10,scaleY:1};