adding a 2D Sprite with a mouse click

i'm just beginning to code in C# / XNA I've made a very simple little program in XNA, its a drawn rectangle, with 3 randomly generated balls inside, the balls are defined in their own class and I've been following this tutorial http://www.bluerosegames.com/brg/xna101.aspx

the balls are generated using

int ballCount = 3开发者_高级运维;

and what i wanted to do is make it so a mouse click would increase the int by 1, adding another ball to the screen

my code looks like this, but I'm not sure if it's right / possible

         mouseStateCurrent = Mouse.GetState();

        if (mouseStateCurrent.LeftButton == ButtonState.Pressed &&
            mouseStatePrevious.LeftButton == ButtonState.Released)
        {

            ballCount = ballCount+1;

        }

        mouseStatePrevious = mouseStateCurrent;

any help advice would be helpful :)

i am using a code to draw the balls already that looks like this

        spriteBatch.Begin();
        spriteBatch.Draw(debugColor, TextBox, Color.White);
        spriteBatch.Draw(background, backgroundRectangle, Color.White);
        foreach (BouncingBall ball in balls)
        {
            ball.Draw(spriteBatch);
        }
        spriteBatch.End();
        base.Draw(gameTime);

is it possible to edit this to get the "click to add balls" effect?

If balls is defined as a List<BouncingBall> that is accessible to the Game class, in your MouseClick event you can use balls.Add(new BouncingBall());. Because you are using a foreach loop, it will increment the number of balls each loop and your Draw code will already cater for any new balls added.

In your draw method you can do something like

 protected override void Draw(GameTime gameTime)
    {
        GraphicsDevice.Clear(Color.CornflowerBlue);
        spriteBatch.Begin();
      for(var i=0;i<ballcount;i++)
      {
          spriteBatch.Draw()
      }
        spriteBatch.End();
        base.Draw(gameTime);
    }