Spritesheet in Silverlight

Question

Does anyone have an example of using a spritesheet in Silverlight? I'd like to clip the image and, when a button is pressed, jump to the next frame. (If the user keeps tapping the button, it'll look like an animation). I've looked around but haven't found exactly what I'm looking for. Thanks for any help.

Answer 1

The following will do exactly what you're looking for. You can use the Up ↑ and Down ↓ keys on your keyboard to navigate forwards and backwards through the animation.

XAML

<Rectangle x:Name="imgRect">
    <Rectangle.Fill>
        <ImageBrush x:Name="imgBrush" ImageSource="walking_spritesheet.png" Stretch="None" AlignmentX="Left" AlignmentY="Top" />                    
    </Rectangle.Fill>
</Rectangle>

C#

        imgRect.Width = 240; //Set the width of an individual sprite
        imgRect.Height = 296; //Set the height of an individual sprite
        const int ximages = 6; //The number of sprites in each row
        const int yimages = 5; //The number of sprites in each column
        int currentRow = 0;
        int currentColumn = 0;

        TranslateTransform offsetTransform = new TranslateTransform();

        KeyDown += delegate(object sender, KeyEventArgs e)
        {
            switch (e.Key)
            {
                case Key.Up:
                    currentColumn--;
                    if (currentColumn < 0)
                    {
                        currentColumn = ximages -1;
                        if (currentRow == 0)
                        {
                            currentRow = yimages - 1;
                        }
                        else
                        {
                            currentRow--;
                        }
                    }                        
                    break;
                case Key.Down:
                    currentColumn++;
                    if (currentColumn == ximages)
                    {
                        currentColumn = 0;
                        if (currentRow == yimages - 1)
                        {
                            currentRow = 0;
                        }
                        else
                        {
                            currentRow++;
                        }
                    }
                    break;
                default:
                    break;
            }

            offsetTransform.X = -imgRect.Width * currentColumn;
            offsetTransform.Y = -imgRect.Height * currentRow;
            imgBrush.Transform = offsetTransform;

For testing, try using the following image (1440x1480):