Chart Axis Display Units and Logarithmic Scale #3836
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Fix PHPOffice#3833. Among the options for chart axes in Excel are the ability to show labels as multiples of specific powers of 10, with or without an explanatory label. The Excel spec seems to indicate that that you can customize the multiples to other values, but I don't see how to do that in Excel, so that can be a project for another day if someone figures out how. The label title can also be styled; that is not part of this PR, but I will look into it in future. For now, this PR supports the use of multiples with or without labels. The axes can also be displayed on a logarithmic scale (any base between 2 and 1000). This PR supports that.
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I check from time to time. There are a number of problems now, mostly due to the elimination of Php 7.4 and replacement of doc-block typing with explicit Php typing. - Bitwise functions were particularly affected by PR PHPOffice#3718 and PR PHPOffice#3793. - Chart/Axis and Writer/Xlsx were amusingly affected by PR PHPOffice#3836, which added a scaling option which included an array indexed by the known allowable factors, one of which is 1 trillion, which cannot be represented as an integer on a 32-bit system. Issue3833Test, introduced by the same PR (and not suffering any errors) was expanded to test this value. - Some minor changes to Reader/Xls and Shared/OLE/PPS to accommodate hex values which are negative in 32-bit but which Php-32 may wind up casting to large floating point numbers; it is not clear to me why these hadn't shown up as problems previously. Possibly this is the result of changes in the most recent Php versions. - BitAndTest, BitOrTest, BitXorTest and Shared/DateTest were adversely affected by PR PHPOffice#3859 when arguments and/or expected results too large for a 32-bit integer were supplied. - ImExpTest required a slightly reduced precision for 32-bit. No idea why this hadn't shown up earlier.
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Fix #3833. Among the options for chart axes in Excel are the ability to show labels as multiples of specific powers of 10, with or without an explanatory label. The Excel spec seems to indicate that that you can customize the multiples to other values, but I don't see how to do that in Excel, so that can be a project for another day if someone figures out how. The label title can also be styled; that is not part of this PR, but I will look into it in future. For now, this PR supports the use of multiples with or without labels.
The axes can also be displayed on a logarithmic scale (any base between 2 and 1000). This PR supports that.
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