Question

I want to draw an animated image in TextBox, i Google my problem, but i get some examples about drawing a fixed image in TextBox like ExtRichTextBox.

Answer 1

Well if you can draw a fixed image as you say then animating it is simply a matter of changing that fixed image on some interval. I assume you can already do the fixed image bit, so simply setup a timer that will redraw the image using a new frame on some interval.

private void SomeTimer_Tick( ... )
{
    UpdateAnimation();
}

private int _frameCount;
private const int MaxFrames = //whatever, you need to determine this
private void UpdateAnimation()
{
    _frameCount = (_frameCount + 1) % MaxFrames;
    var image = GetFrame( _frameCount );
    // draw the new frame 
}

private const int FrameWidth = // again, you need to determine this
private const int FrameHeight = // again, you need to determine this
private Bitmap GetFrame( int frame )
{
    // assumes frames are lined up horizontally on a sheet
    var rect = new Rectangle( frame * FrameWidth, 0, FrameWidth, FrameHeight );

    // you could create the frames up front to avoid many calls to Clone()
    return MySpriteSheet.Clone( rect, MySpriteSheet.PixelFormat );
}