ScaleBrush -- scale a brush
ScaleBrush(id, width, height[, smooth])
This command scales the brush specified by id to the specified dimensions. Optionally, you can choose to have the scaled graphics interpolated by passing True in the smooth argument. The graphics will then be scaled using anti-alias.

Please note: You should always do scale operations with the original brush. For instance, if you scale brush 1 to 12x8 and then scale it back to 640x480, you will get a messed image. Therefore you should always keep the original brush and scale only copies of it.

Note that for vector brushes, ScaleBrush() will always operate on the untransformed brush. This means that any previous transformations applied to the brush using ScaleBrush(), TransformBrush(), or RotateBrush() will be undone when calling ScaleBrush().

New in V2.0: You can pass #KEEPASPRAT as either width or height. Hollywood will calculate the size then automatically by taking the aspect-ratio of the brush into account.

Starting with Hollywood 2.0, width and height can also be a string containing a percent specification, e.g. "50%".

identifier of the brush to use as source
desired new width for the brush
desired new height for the brush
optional: whether or not anti-aliased scaling shall be used (V2.5)
Scales brush 1 to a resolution of 640x480.

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