CreateJS の API：bezierCurveTo

/*bezierCurveTo() API
*/
var stroke_color = "#ff0000";
var shape =  new createjs.Shape(new createjs.Graphics().beginStroke(stroke_color).moveTo(5, 75).bezierCurveTo(45, 90, 75, 75, -25, -25).endStroke());
this.addChild(shape);