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Low-Level Control of the Frame 129
AskVmarks (mark$())
AskVmarks returns the current vertical marks, in order, in the mark$() array. If
there are no vertical marks at present, it returns an array with no elements. The
lower bound of mark$() is always 1.
SetHRange (low, high)
SetHrange sets the current horizontal range to run from low to high numeric values.
It does not decide how to divide the range into intervals; that is done when you call
DrawFrame.
It does pick a nice interval that encloses your low and high values. If you call
SetHRange(1.1,2.7) for instance, it will use the nicer range 1 to 3. A subsequent call
to AskHrange will return the nice version – not necessarily the range you gave. (And
DrawFrame may tamper with this range a second time in its efforts to get numeric
marks that fit in the space provided!)
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x NOTE: You cannot use this routine with the higher-level routines in
the Business, Scientific or Statistics Graphics Toolkits, since they
override your setting. Use SetXscale instead.
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AskHrange (low, high)
AskHrange returns the current horizontal range. The low end is given in low and the
high end in high. If the horizontal marks are textual, instead of a numeric range, it
returns low = 1 and high = the number of marks.
SetVRange (low, high)
SetVrange sets the current vertical range to run from low to high numeric values. It
does not decide how to divide the range into intervals; that is done when you call
DrawFrame. As with SetHRange, the range finally used may not be the same as the
range you passed in low and high.
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x NOTE: You cannot use this routine with the higher-level routines in
the Business, Scientific or Statistics Graphics Toolkits, since they
override your setting. Use SetYscale instead.
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