Use it to handle "fade to black" situations... Think of it as a theater curtain.

It draws a rectangle as big as u specify in the color u specify, and fades its alpha in and out.

Requires ofxAnimatable addon.

Let's see how to make a screen fade to black and back, triggering an action when the curtain is fully down.

ofxScreenCurtain curtain;

update(){
	curtain.update( 0.016666f );

	//once curtain hits the bottom, change the contents
	if ( curtain.hasReachedBottom() ){
		doYourThingie();
	}
}

draw(){
	curtain.draw();
}

mousePressed(){		
	if (curtain.isReady()){
		curtain.dropAndRaiseCurtain(
									0.25 /*go down duration*/, 
									0.1 /*stay down duration*/, 
									0.25 /*go up duration*/
									);
	}
}