this.drawHappyFace1 = function(ctx, scaleFactor)
      {      
        ctx.lineWidth = 2; 
        ctx.strokeStyle = "#000000";
        ctx.fillStyle = "#000000";
        ctx.beginPath(); 
        ctx.arc(0.0, 0.0, 
          this.radius * 0.25 * scaleFactor, 0, Math.PI, false);
        ctx.stroke();
      }