Editing updatePreview - FilterMeisterWiki

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= updatePreview =

== Syntax ==
{{int updatePreview(int id)}}

== Arguments ==
:'''id'''
::The ID of the proxy preview control to be updated.

== Return ==
Returns 1 if doingProxy (and the preview was updated), 0 otherwise.

== Description ==
updatePreview causes the proxy preview to be immediately updated with the current contents of the output image.  This is useful for animating iterative algorithms in the preview window.  At present, FM supports only one proxy preview, so the 'id' argument is ignored.

== Example ==
<code>
%ffp

ForEveryTile:
{
  // row by row
  for( y = 0; y < Y; y++ )
  {
    // column by column
    for( x = 0; x < X; x++ )
    {
      // channel by channel
      for( z = 0; z < Z; z++ )
      {

// apply an effect
        pset( x, y, z,
          src( x % 100, y % 100, z )
          + rnd( -50, 50 ) );
      }
    }

// update the progress bar
    updateProgress( y, Y );

// update the preview
    // (only in filter dialog)
    updatePreview( a );

}
  return true;
}
</code>

== See Also ==
((updateProgress))

== Comments ==
Everyone can add his comments about his experiences with this function here. Tips for using it are welcome, too.

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