ChartDirector 6.0 (ASP/COM/VB Edition)
Ensures the viewport left, top, width and height are within valid ranges and adjusts them if necessary.
The valid ranges of the viewport width and height should be 0 to 1. The viewport left should be in between 0 and (1 - viewport width). The viewport top should be in between 0 and (1 - viewport height).
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