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Subject: [OASIS Issue Tracker] (OFFICE-3936) logarithmic scale misses information about basis

• From: OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>
• To: office@lists.oasis-open.org
• Date: Mon, 7 Feb 2022 11:24:00 +0000 (UTC)

```     [ https://issues.oasis-open.org/browse/OFFICE-3936?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Stahl updated OFFICE-3936:
----------------------------------
Proposal:
20.xx The chart:major-origin attribute specifies the location of one major tick.

20.xx The chart:minor-logarithmic attribute specifies whether the minor ticks are spaced equally after the logarithmic transformation. If this value is false they are spaced equally before the transformation.

20.27 The chart:interval-major attribute specifies major intervals on an axis 11.8.
If the axis is linear and the value of this attribute is x with the value of chart:major-origin being w, major ticks are placed at w+n*x for n being any (positive, negative or zero) integer.
If the axis is logarithmic and the value of this attribute is x with the value of chart:major-origin being w, major ticks are placed at w*(10^(n*x)) for n being any (positive, negative or zero) integer. (Note: if {noformat}x = log_{10}(y){noformat}, then {noformat}10^(n*x) = y^n{noformat}.)

20.28 The chart:interval-minor-divisor attribute specifies a divisor for the chart:interval-major value, the division of which determines the minor interval:

If chart:minor-logarithmic is false the ticks are placed as follows:
If a and b are the values of consecutive major ticks (see 20.27) and m is the value of chart:interval-minor-divisor then the minor ticks are placed at locations corresponding to the values a + (b-a)/m * k with k = 1,2, ..., (m-1). So the minor ticks are equally spaced before the logarithmic transformation.

If chart:minor-logarithmic is true the ticks are placed as follows:
If a and b are the values of consecutive major ticks (see 20.27) and m is the value of chart:interval-minor-divisor then the minor ticks are placed at locations corresponding to the values a*((b/a)^(k/m)) with k = 1,2, ..., (m-1). So the minor ticks are equally spaced after the logarithmic transformation.

Schema Change:

{noformat}

--- OpenDocument-v1.2-os-schema.rng	2017-10-27 18:22:13.973894000 -0600
+++ OpenDocument-v1.2-os-schema+log-changes.rng	2017-10-29 12:12:35.544258788 -0600
@@ -17476,11 +17476,21 @@
</attribute>
</optional>
<optional>
+				<attribute name="chart:major-origin">
+					<ref name="double"/>
+				</attribute>
+			</optional>
+			<optional>
<attribute name="chart:interval-major">
<ref name="double"/>
</attribute>
</optional>
<optional>
+				<attribute name="chart:minor-logarithmic">
+					<ref name="boolean"/>
+				</attribute>
+			</optional>
+			<optional>
<attribute name="chart:interval-minor-divisor">
<ref name="positiveInteger"/>
</attribute>

{noformat}

was:
20.xx The chart:major-origin attribute specifies the location of one major tick.

20.xx The chart:minor-logarithmic attribute specifies whether the minor ticks are spaced equally after the logarithmic transformation. If this value is false they are spaced equally before the transformation.

20.27 The chart:interval-major attribute specifies major intervals on an axis 11.8.
If the axis is linear and the value of this attribute is x with the value of chart:major-origin being w, major ticks are placed at w+n*x for n being any (positive, negative or zero) integer.
If the axis is logarithmic and the value of this attribute is x with the value of chart:major-origin being w, major ticks are placed at w*(10^(n*x)) for n being any (positive, negative or zero) integer. (Note: if x = log_{10}(y), then 10^(n*x) = y^n.)

20.28 The chart:interval-minor-divisor attribute specifies a divisor for the chart:interval-major value, the division of which determines the minor interval:

If chart:minor-logarithmic is false the ticks are placed as follows:
If a and b are the values of consecutive major ticks (see 20.27) and m is the value of chart:interval-minor-divisor then the minor ticks are placed at locations corresponding to the values a + (b-a)/m * k with k = 1,2, ..., (m-1). So the minor ticks are equally spaced before the logarithmic transformation.

If chart:minor-logarithmic is true the ticks are placed as follows:
If a and b are the values of consecutive major ticks (see 20.27) and m is the value of chart:interval-minor-divisor then the minor ticks are placed at locations corresponding to the values a*((b/a)^(k/m)) with k = 1,2, ..., (m-1). So the minor ticks are equally spaced after the logarithmic transformation.

Schema Change:

{noformat}

--- OpenDocument-v1.2-os-schema.rng	2017-10-27 18:22:13.973894000 -0600
+++ OpenDocument-v1.2-os-schema+log-changes.rng	2017-10-29 12:12:35.544258788 -0600
@@ -17476,11 +17476,21 @@
</attribute>
</optional>
<optional>
+				<attribute name="chart:major-origin">
+					<ref name="double"/>
+				</attribute>
+			</optional>
+			<optional>
<attribute name="chart:interval-major">
<ref name="double"/>
</attribute>
</optional>
<optional>
+				<attribute name="chart:minor-logarithmic">
+					<ref name="boolean"/>
+				</attribute>
+			</optional>
+			<optional>
<attribute name="chart:interval-minor-divisor">
<ref name="positiveInteger"/>
</attribute>

{noformat}

> logarithmic scale misses information about basis
> ------------------------------------------------
>
>                 Key: OFFICE-3936
>                 URL: https://issues.oasis-open.org/browse/OFFICE-3936
>             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
>          Issue Type: New Feature
>          Components: Chart
>    Affects Versions: ODF 1.2
>            Reporter: Regina Henschel
>            Assignee: Andreas Guelzow
>            Priority: Major
>             Fix For: ODF 1.4
>
>
> http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part1.html#property-chart_interval-major
> Although the basis 10 is widely used, others a common too, e.g basis 2 for audiogram.
> This proposal adds not only the basis but additional details to the description of chart:interval-major and chart:interval-minor-division.
> Specifications are not only read by developers but by authors of guides and tutorials too. For those the mathematic impact of the attributes values might be not obvious.
> Formulas in the proposal are written StarMath.
> I think, that logarithmic scale should only be allowed for a value-axis, but have not included that in this proposal.

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