Adds a logarithmic scale to a chart's axis. More...
|Import Statement:||import QtCharts 2.2|
A logarithmic scale is a nonlinear scale that is based on orders of magnitude, so that each tick mark on the axis is the previous tick mark multiplied by a value.
Note: If a LogValueAxis type is attached to a series with one or more points with negative or zero values on the associated dimension, the series will not be plotted at all. This is particularly relevant when XYModelMappers are used, since empty cells in models typically contain zero values.
base : real
The base of the logarithm.
The value has to be greater than 0 and cannot equal 1.
labelFormat : real
The label format of the axis.
The format string supports the following conversion specifiers, length modifiers, and flags provided by
printf() in the standard C++ library: d, i, o, x, X, f, F, e, E, g, G, c.
If ChartView.localizeNumbers is
true, the supported specifiers are limited to: d, e, E, f, g, G, and i. Also, only the precision modifier is supported. The rest of the formatting comes from the default QLocale of the application.
See also QString::asprintf().
max : real
The maximum value on the axis.
When setting this property, the minimum value is adjusted if necessary, to ensure that the range remains valid. The value has to be greater than 0.
min : real
The minimum value on the axis.
When setting this property, the maximum value is adjusted if necessary, to ensure that the range remains valid. The value has to be greater than 0.
minorTickCount : int
The number of minor tick marks on the axis. This indicates how many grid lines are drawn between major ticks on the chart. Labels are not drawn for minor ticks. The default value is 0. Set the value to -1 and the number of grid lines between major ticks will be calculated automatically.
tickCount : int
The number of tick marks on the axis. This indicates how many grid lines are drawn on the chart. This value is read-only.
This signal is emitted when the number of minor tick marks on the axis, specified by minorTickCount, changes.
This signal is emitted when the number of tick marks on the axis, specified by tickCount, changes.
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