this.drawOohFace = function(ctx, scaleFactor)
      {
        ctx.lineWidth = 2; 
        ctx.strokeStyle = "#000000";
        ctx.fillStyle = "#000000";
        ctx.beginPath(); 
        ctx.arc(0.0, (0.1 * this.radius) * scaleFactor, 
          this.radius * 0.25 * scaleFactor, 0, Math.PI, false);
        ctx.fill();  
  
        ctx.beginPath();
  
        ctx.moveTo((-0.25 * this.radius) * scaleFactor, (-0.3 * this.radius) * scaleFactor);
        ctx.lineTo((-0.05 * this.radius) * scaleFactor, (-0.2 * this.radius) * scaleFactor);
        ctx.lineTo((-0.25 * this.radius) * scaleFactor, (-0.1 * this.radius) * scaleFactor);
  
        ctx.moveTo((0.25 * this.radius) * scaleFactor, (-0.3 * this.radius) * scaleFactor);
        ctx.lineTo((0.05 * this.radius) * scaleFactor, (-0.2 * this.radius) * scaleFactor);
        ctx.lineTo((0.25 * this.radius) * scaleFactor, (-0.1 * this.radius) * scaleFactor);
  
        ctx.stroke();           
      }