Noobie C# question; PONG

Thanks! This has all been very helpful.

So now I'm trying to do it OOP style, with a Class for the Ball.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication8
{
    public partial class Form1 : Form
    {
        private bool direction;
        class Ball
        {
            public int xCoord;
            public int yCoord;
            public int xVelocity;
            public int yVelocity;
        }

        public void Form1()
        {
            InitializeComponent();
        }
       

        public void Form1_Load(object sender, EventArgs e)
        {
            direction = false;
            Ball gameBall = new Ball();
        }
             
        public void button1_Click(object sender, EventArgs e)
        {
          
            //toggle ball movement on/off   
            if  (timer1.Enabled == true)
             
                 timer1.Enabled = false;
            else timer1.Enabled = true;
        }

        public void timer1_Tick(object sender, EventArgs e)
        {                      
        }                
    }
}  

Looks good! Seems like a very fun project, and it's really nice to see the evolution of your code.

        public void button1_Click(object sender, EventArgs e)

@evildictaitor:

I prefer the more robust:

timer1.Enabled = (timer1.Enabled == false);  // reverses state of timer

Thanks all for the help, especially the optimization for the Timer. Can anyone explain (in the simplest terms possible) how to connect the lblBall with the Class Ball? It seems to me that there must be a method that ties the two together. A PictureBox or Image would be better than the Label, but I don't know how to write the Method. Thanks!

(Sorry, mobile phone did a double post...)

@infinitum3d:While you could use a label or a picture box or image (or anything for that matter), you are now asking another question where object oriented programming can come to light.

You are in essence (so far) discussing a generic "object" which is to be moved in a given direction based upon a timing event.  You have not actually described what the object is, how it is physically displayed, and so on.  Your "ball" class would probably be an attribute of a larger object denoting the physical location in "n-space" of that object.

3 hours ago, lensman wrote

@evildictaitor:

I prefer the more robust:

timer1.Enabled = (timer1.Enabled == false);  // reverses state of timer

Define robust. Your code does exactly the same thing that mine does, apart from it does it more inefficiently, both in terms of code to be executed, legibility and number of characters needed to be written by the developer.

(Sorry. Mobile phone again...)

(and again... Still sorry)

BTW- I post from my mobile phone, so if it ever looks screwy I blame it on the device

@evildictaitor:Well, to be honest robust is in the eye of the beholder.  I admit your code and my code function the same.

The use of !timer1.Enabled relies upon a quirk of the compiler.  It is not guaranteed to work 100% of the time on all systems.  Yes, it does today, but tomorrow may be another question.  I have been coding since the late 70's and have worked on systems where that statement would fail.

I use the code "timer1.Enabled = (timer1.Enabled == false)" primarily to overstate my intention so that any viewer of the code cannot help know the purpose of the desired action.  Something that is intuitive to you might not be intuitive to the "newbie".  I code for readability not necessarily the least number of keystrokes.  (heck, I threw in a comment just to ensure the obvious)

4 hours ago, lensman wrote

The use of !timer1.Enabled relies upon a quirk of the compiler.  It is not guaranteed to work 100% of the time on all systems.  Yes, it does today, but tomorrow may be another question.

It's guaranteed to work in any system which has valid boolean logic. I'd kind of worry about any that didn't.

Maybe you're thinking of some dev's occasional over reliance on assumptions about the specific numeric value of a boolean return which don't always hold true.

16 hours ago, infinitum3d wrote

Thanks all for the help, especially the optimization for the Timer. Can anyone explain (in the simplest terms possible) how to connect the lblBall with the Class Ball? It seems to me that there must be a method that ties the two together. A PictureBox or Image would be better than the Label, but I don't know how to write the Method. Thanks!

There are lots of ways. The most straightforward would be to use events to listen for when the Ball's properties have changed, and update the interface to match (Ball class raises an event, interface handles that event).

You could also use databinding and the INotifyPropertyChanged interface.

15 hours ago, lensman wrote

@infinitum3d:While you could use a label or a picture box or image (or anything for that matter), you are now asking another question where object oriented programming can come to light.

You are in essence (so far) discussing a generic "object" which is to be moved in a given direction based upon a timing event.  You have not actually described what the object is, how it is physically displayed, and so on.  Your "ball" class would probably be an attribute of a larger object denoting the physical location in "n-space" of that object.

 

So something like this?

using System;

public class ballPictureAttribute : Attribute

{

}

[ballPicture()] public class Ball

{

}

@spivonious:

Thanks! That seems a bit beyond my ability at this time, but using a Class as an Attribute seems pretty straightforward.

8 hours ago, lensman wrote

The use of !timer1.Enabled relies upon a quirk of the compiler.  It is not guaranteed to work 100% of the time on all systems.  Yes, it does today, but tomorrow may be another question.  I have been coding since the late 70's and have worked on systems where that statement would fail.

In C# it is not a quirk of the compiler. It is a guarranteed tenet of the language.

!true == false

!false == true

Always, on all systems, for now and forever.

Hi everyone.

I need your help.

I know that when i press double click to a button in c#, it appears its code: 

private void button1_Click(object sender, EventArgs e)
{... }

But what shall I do to appear this:

private void button1_Click_1(object sender, EventArgs e)
{...}

I mention that if I simply write

private void button1_Click_1(object sender, EventArgs e)
{...}

     in the program, it doesn't have any effect.

Thanks a lot!