Background image scrolling vertically

Question

I am developing a game. In this I need background image scrolling vertically from top to bottom.

Actually my emulator size is 320*720(width*height) but my background image size is 320*3840. So now I need background image scroll from Height: 720 to 3840.

I have code for a background image scrolling but background image not scrolling properly. Please help me.
Here is my code,

        private Bitmap mBackgroundImageFar; //my image
        private int mBGFarMoveY = 0;

                 mBGFarMoveY = mBGFarMoveY + 2;

        int newFarY = mBackgroundImageFar.Height - (- mBGFarMoveY);

        if (newFarY <= 0) 
        {
            mBGFarMoveY =0;
            canvas.DrawBitmap (mBackgroundImageFar,0,mBGFarMoveY,null);
        } 
        else
        {
            canvas.DrawBitmap (mBackgroundImageFar,0,mBGFarMoveY,null);
            canvas.DrawBitmap (mBackgroundImageFar,0,newFarY, null);
        }

If I write any mistakes please excuse me.

Thanks & Regard's, Chakri.

score 1 · Answer 1 · answered Jul 17 '12 at 09:30

1

Are you using any game engine? if no, easy way to solve your problem is using game engine. For example solving in andengine is CameraScene or ParallaxBackground

answered Jul 17 '12 at 09:30

Andrew F

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I am not using any game engine. Regards,chakri – Chakri Jul 17 '12 at 09:50
try this http://stackoverflow.com/questions/4775650/android-moving-background-image-while-navigating-through-views – Andrew F Jul 17 '12 at 09:57
Thank you, but I am developing a game in Mono droid tool. How can I use a game engine in my application. – Chakri Jul 17 '12 at 12:21
sorry, but it's the first time I heard about the Mono droid tool. I'm using eclipse and just need to add the engine library to the project to work with it. – Andrew F Jul 17 '12 at 13:18

score 1 · Accepted Answer · answered Oct 17 '12 at 12:03

1

    private Bitmap mBackgroundImageFar; //my image
    private int mBGFarMoveY = 0;

             mBGFarMoveY = mBGFarMoveY + 2;

    int newFarY = mBackgroundImageFar.Height - (+ mBGFarMoveY);

    if (newFarY <= 0) 
    {
        mBGFarMoveY =0;
        canvas.DrawBitmap (mBackgroundImageFar,0,mBGFarMoveY,null);
    } 
    else
    {
        canvas.DrawBitmap (mBackgroundImageFar,0,mBGFarMoveY,null);
        canvas.DrawBitmap (mBackgroundImageFar,newFarY,0, null);
    }

answered Oct 17 '12 at 12:03

Chakri

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Some explanation would be nice. – Andrew Barber Oct 17 '12 at 12:04
Changed the -mBGFarMoveY direction to +mBGFarMoveY then it moves vertically and here canvas.DrawBitmap (mBackgroundImageFar,0,newFarY, null); changed to canvas.DrawBitmap (mBackgroundImageFar,newFarY,0, null); then mBGFarMoveY moves on the Y-axis. – Chakri Oct 17 '12 at 12:08

Background image scrolling vertically

2 Answers2