Trying to figure out how to get an object moving within the bounds of a window....

So I now have a bitmap moving at a "slow"pass from left to right in a window ap. Everytime it hits the right boundry it gets moved back to 0(x-plane)and down 50(y-plane) pixels. Hear is that code for that part

Code:

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    if (rect.right > 0)
    {
              gPosX = gPosX + 1;
                if ( gPosX >= rect.right )
                {
                        gPosY = gPosY + 50;
                        gPosX = 0;
                }
                if ( gPosY >  rect.bottom - 60 )
                {
                        gPosY = 0;
                        gPosX=0;
                }
        DrawBitmap(global_hdc, "c.bmp", gPosX, gPosY);
    }

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I acheived it moving at a "slow" pace by making a call to the Sleep() function in my main loop. Beautiful! Anyways I am now that I actually have the bitmap moving in a fashion I want it to, I need to take it one step further. I need to get the bitmap to move in random directions with in the bounds of the form. How would you suggest to do this? I tried a few diffrent if statments out but it seems one defeats the other as the build up.

Any suggestions would be great....

Thanks

Chad

This may help you out some it is an allegro based pong game it is well labeled so you should be able to find the part you need in it just use that and you should be up and running in no time. http://alleg.sourceforge.net/docs/ho...g_game.en.html

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I acheived it moving at a "slow" pace by making a call to the Sleep() function in my main loop.

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That might not work properly on slower computers.

Quote:

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I tried a few [different] if [statements] out but it seems one defeats the other

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Have a variable like x_direction which only changes when the object hits the side. Or something like that. You can't just do this, as you've found out:

Code:

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if(rand() % 2) move_left();
else move_right();

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Thanks for the help but I think I figured it out a few days ago....Hear is what I ended up doing..

Code:

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    if (rect.right > 0)
    {
                gPosX = gPosX + xDirection;
                gPosY = gPosY + yDirection;
                       
                        //Handles movement in the X-axis
                        if (gPosX > rect.right - 85)
                        {
                                PlaySound("crashA.wav",0,SND_ASYNC|SND_FILENAME);
                                xDirection = -1;
                        }
                        else if (gPosX < rect.left)
                        {
                                PlaySound("crashB.wav",0,SND_ASYNC|SND_FILENAME);
                                xDirection = 1;
                        }

                        //Handles movement in the Y-axis
                        if (gPosY > rect.bottom - 140)
                        {
                                PlaySound("crashA.wav",0,SND_ASYNC|SND_FILENAME);
                                yDirection = -1;
                        }
                        else if (gPosY < rect.top)
                        {
                                PlaySound("crashB.wav",0,SND_ASYNC|SND_FILENAME);
                                yDirection = 1;
                        }

        DrawBitmap(global_hdc, "c.bmp", gPosX, gPosY);
    }

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By the way why won't sleep() work on slower computers...

Quote:

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By the way why won't sleep() work on slower computers...

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I already said that. :) You'll want to use a function like SDL_GetTicks() instead.