Help with generating random numbers.

Sam Anders

Help! im trying to generate a random number for a very basic XNA application I have been working on. Right now, what im trying to do is have an image display at a random co-ordinate at the screen. I've been successful at getting the circle to appear at a random point, the problem is; I can't get it to stop being at a random point! Literally all it does is bounce around the screen like it's high on crack. I would like to know how to generate a single random number for X/Y values and then stop. If anyone could help me with this it would be much appreciated.

//the draw function
        {
            graphics.GraphicsDevice.Clear(Color.Black);
            spriteBatch.Begin();
            spriteBatch.Draw (circle, new Rectangle(circlePosY + 180, circlePosX + 180, circle.Height, circle.Width), Color.White);
            spriteBatch.Draw(circleG, new Rectangle(0, 0, circleG.Height, circleG.Width), Color.White);
            spriteBatch.End();
            GPosResultX = rand.Next(1,380);
            GPosResultY = rand.Next(1, 380);

        }

//definitions
    int circleGPosY;
        int circleGPosX;
        int GPosResultX;
        int GPosResultY;
        Random rand = new Random();

2 Replies

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Sam Hobbs15y ago
You call your code "the draw function" but I think there is some important information that you are excluding. So please tell us how that code is called.

My guess is that you are not familiar with the way that graphics works in Windows. Windows depends on the application to draw a window and (here is the important part) Windows depends on the application to draw the window again whenever something happens such as when a window is minimized then restored or when another window is moved; things like that. The drawing is also called painting. So your program might be causing the drawing to be redone continuoulsy. Since your "draw function" is generating a new location each time, the location changes.

So you need to do two things. You need to do the random location determination outside the drawing code and you need to determine what is causing the drawing to be redone continuously.
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Vilas Gite15y ago
Hi Sam,

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