function GetSample(X, Y: TFloat): TColor32; override;
GetSample provides a method for acquiring a color sample from the coordinate (X, Y). The sample may be generated by the sampler itself, or it may be acquired from a nested sampler. Descendants of TCustomSampler must always override at least one of GetSampleFixed or GetSampleFloat.
The different postfixes determines the precision of the input parameters (integer, fixed-point or floating-point).
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