var lineDrawing:MovieClip = new MovieClip();
this.addChild(lineDrawing);

lineDrawing.graphics.lineStyle(1);
lineDrawing.graphics.moveTo(0,0); ///This is where we start drawing
lineDrawing.graphics.lineTo(350, 600);
lineDrawing.graphics.lineTo(600, 400);

var dropShadow:DropShadowFilter = new DropShadowFilter();
dropShadow.color = 0x000000;
dropShadow.blurX = 10;
dropShadow.blurY = 10;
dropShadow.angle = 0;
dropShadow.alpha = 0.5;
dropShadow.distance = 10;


var filtersArray:Array = new Array(dropShadow);
lineDrawing.filters = filtersArray;

Just some code that shows you how to set up the Drawing API and draw a line and also use the dropshadow filter.

AS3 Drawing API Line Drawing and DropShadow

actionscript, flash, filter, api, 3

ActionScript 3