Flash / Flex / ActionScript/Graphics/Curve

Curve control point

   <source lang="java">

package{

 import flash.display.Sprite;
 import flash.display.*;
 public class Main extends Sprite{
   public function Main(){
       var canvas:Shape = new Shape(  );
       addChild(canvas);
       canvas.graphics.lineStyle(2, 0x0000FF);
       curveThrough3Pts(canvas.graphics, 100, 100, 150, 50, 200, 100);
   }// Adapted from Robert Penner"s drawCurve3Pts(  ) method
   public function curveThrough3Pts (g:Graphics,startX:Number, startY:Number,
                                     throughX:Number, throughY:Number,
                                     endX:Number, endY:Number) {
     var controlX:Number = (2 * throughX) - .5 * (startX + endX);
     var controlY:Number = (2 * throughY) - .5 * (startY + endY);
     g.moveTo(startX, startY);
     g.curveTo(controlX, controlY, endX, endY);
   }

 }

}

       </source>
   
  

Drawing Curves: curveTo(controlX:Number, controlY:Number, anchorX:Number, anchorY:Number)

   <source lang="java">

package{

 import flash.display.*;
 
 public class Main extends Sprite{
   public function Main(){
       var canvas:Shape = new Shape(  );
       addChild(canvas);
       canvas.graphics.lineStyle(4);  // Set the stroke to 4-point, black
       canvas.graphics.curveTo(50, 100, 100, 0);  // Draw the curve
   }
 }

}

       </source>
   
  

Drawing Curves in a Graphics Object

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
     var spr:Sprite = new Sprite();
     spr.graphics.beginFill(0x0000ff, 1.0);
     spr.graphics.lineStyle(1, 0x0000ff);
     spr.graphics.moveTo(30, 30);
     spr.graphics.curveTo(180, 20, 250, 30);
     spr.graphics.endFill();
     addChild(spr);
   }
 }

}

       </source>