how to draw a line in flex 4

You can draw lines in MXML or in ActionScript:

    <s:Line xFrom="20" yFrom="20" xTo="100" yTo="100">
        <s:stroke>
            <s:SolidColorStroke color="black"/>
        </s:stroke>
    </s:Line>
    <s:Line xFrom="100" yFrom="20" xTo="20" yTo="100">
        <s:stroke>
            <s:SolidColorStroke color="gray" alpha=".6" weight="10"/>
        </s:stroke>
    </s:Line>

var canvas:Sprite = new Sprite();
addChild(canvas);
stage.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
stage.addEventListener(MouseEvent.MOUSE_UP, stop_drawing);
function mouseDownHandler(event:MouseEvent):void {
    stage.addEventListener(MouseEvent.MOUSE_MOVE, draw_line);   
}
function stop_drawing(e:MouseEvent):void
{
    stage.removeEventListener(MouseEvent.MOUSE_MOVE, draw_line);   
}

function draw_line(e:MouseEvent):void
{   canvas.graphics.lineStyle(1, 0xFF6633);
    canvas.graphics.lineTo(mouseX, mouseY);
    e.updateAfterEvent();
}

http://www.actionscript.org/forums/showthread.php3?t=187890

http://help.adobe.com/en_US/flex/using/WS2db454920e96a9e51e63e3d11c0bf69084-7f70.html

http://www.artima.com/articles/drawing_lines_in_flex_4.html

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Greg Lafrance - Flex 2 and 3 ACE certified

www.ChikaraDev.com

Flex Training and Support Services