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Add chart axis crossing support.

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John McNamara 2017-01-14 00:43:03 +00:00
parent 65fd0bcb38
commit 3058df2b1c
3 changed files with 42 additions and 1 deletions
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43
include/xlsxwriter/chart.h
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@ -1455,8 +1455,49 @@ void chart_axis_set_pattern(lxw_chart_axis *axis, lxw_chart_pattern *pattern);
*/
void chart_axis_set_reverse(lxw_chart_axis *axis);
/**
* @brief Set the position that the axis will cross the opposite axis.
*
* @param axis A pointer to a chart #lxw_chart_axis object.
* @param value The category or value that the axis crosses at.
*
* Set the position that the axis will cross the opposite axis:
*
* @code
* chart_axis_set_crossing(chart->x_axis, 3);
* chart_axis_set_crossing(chart->y_axis, 8);
* @endcode
*
* @image html chart_crossing1.png
*
* If crossing is omitted (the default) the crossing will be set automatically
* by Excel based on the chart data.
*
* **Axis types**: This function is applicable to to all axes types.
* See @ref ww_charts_axes.
*/
void chart_axis_set_crossing(lxw_chart_axis *axis, double value);
/**
* @brief Set the opposite axis crossing position as the axis maximum.
*
* @param axis A pointer to a chart #lxw_chart_axis object.
*
* Set the position that the opposite axis will cross as the axis maximum.
* The default axis crossing position is generally the axis minimum so this
* function can be used to reverse the location of the axes without reversing
* the number sequence:
*
* @code
* chart_axis_set_crossing_max(chart->x_axis);
* chart_axis_set_crossing_max(chart->y_axis);
* @endcode
*
* @image html chart_crossing2.png
*
* **Axis types**: This function is applicable to to all axes types.
* See @ref ww_charts_axes.
*/
void chart_axis_set_crossing_max(lxw_chart_axis *axis);
/**
@ -1478,7 +1519,7 @@ void chart_axis_set_crossing_max(lxw_chart_axis *axis);
void chart_axis_off(lxw_chart_axis *axis);
/**
* @brief Position the axis on or between the axis tick marks.
* @brief Position a category axis on or between the axis tick marks.
*
* @param axis A pointer to a chart #lxw_chart_axis object.
* @param position A #lxw_chart_axis_tick_position value.