Object getting of the screen

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Hello! I made a question an hour ago because I was getting problems to move a bitmap in C#. Now it moves, but it keeps getting off of the screen. Its position changes, but the limit should be the border of the window, but it isn't.

Here's my code

private void timerGameLoop_Tick(object sender, EventArgs e)
      {
          UpdateVar();
          this.Refresh();
      }
      private void UpdateVar()

      {

          cVarandas.Update(
         rnd.Next(this.Width - Resources.vhappy.Width, Resources.vhappy.Width ),
           rnd.Next(this.Height - Resources.vhappy.Height , this.Height)
                );

What I have tried:

I tried to change to (this.width - Resources.vhappy.Width /2) for example, but didn't work.

Sorry if I spelled something wrong, english isn't my first language.
Would appreciate some help, thank you!

Posted 28-Mar-20 8:02am

Lousada SCP

Updated 28-Mar-20 9:46am

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gggustafson 28-Mar-20 16:13pm

I am not a "gamer" however I have experience moving items around on a monitor. In my situations, not necessarily yours, I take action on the main timer tick. When the tick occurs, I move whatever objects need to be moved. I then determine if any of the objects have "hit" the screen border. If so, I revise the position (by changing the x- and y-coordinates). After all border collisions have been fixed, I update the monitor display (through the Paint event handler).

Lousada SCP 28-Mar-20 16:58pm

Hello! Thank you for your answer! And how do I change de x and y coordinates?

gggustafson 28-Mar-20 23:51pm

I assume that you repaint your moving item directly. Thus, as you move an item, just before you make the move test if the rightmost part of the object is overlapping the right side of the monitor. If that's the case, change the sign of the x velocity. Likewise for the other three sides.

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OriginalGriff · Accepted Answer · 2020-03-28T09:47:00

Use the debugger and find out what numbers you are dealing with: what values are in this.Width, Resources.vhappy.Width, this.Height, and Resources.vhappy.Height while your code is running.
When you know that, you can tell how large the values being passed to your Update method, and then look at that to find out what it is doing with them.
We can't do that for you: we can't run your code - so the debugger is (as it always should be) your friend and your first port of call. If you don't know how to use it then a quick Google for "Visual Studio debugger" should give you the info you need.

Put a breakpoint on the first line in the function, and run your code through the debugger. Then look at your code, and at your data and work out what should happen manually. Then single step each line checking that what you expected to happen is exactly what did. When it isn't, that's when you have a problem, and you can back-track (or run it again and look more closely) to find out why.

Sorry, but we can't do that for you - time for you to learn a new (and very, very useful) skill: debugging!

Object getting of the screen

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Object getting of the screen

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