Customize Chart Axes in Presentations with Python

Getting the Max Values on the Vertical Axis on Charts

Aspose.Slides for Python via .NET allows you to obtain the minimum and maximum values on a vertical axis. Go through these steps:

  1. Create an instance of the Presentation class.
  2. Access the first slide.
  3. Add a chart with default data.
  4. Get the actual maximum value on the axis.
  5. Get the actual minimum value on the axis.
  6. Get the actual major unit of the axis.
  7. Get the actual minor unit of the axis.
  8. Get the actual major unit scale of the axis.
  9. Get the actual minor unit scale of the axis.

This sample code—an implementation of the steps above—shows you how to get the required values in Python:

import aspose.slides.charts as charts
import aspose.slides as slides

with slides.Presentation() as pres:
	chart = pres.slides[0].shapes.add_chart(charts.ChartType.AREA, 100, 100, 500, 350)
	chart.validate_chart_layout()

	maxValue = chart.axes.vertical_axis.actual_max_value
	minValue = chart.axes.vertical_axis.actual_min_value

	majorUnit = chart.axes.horizontal_axis.actual_major_unit
	minorUnit = chart.axes.horizontal_axis.actual_minor_unit
	
	# Saves the presentation
	pres.save("ErrorBars_out.pptx", slides.export.SaveFormat.PPTX)

Swapping the Data between Axes

Aspose.Slides allows you to quickly swap the data between axes—the data represented on the vertical axis (y-axis) moves to the horizontal axis (x-axis) and vice versa.

This Python code shows you how to perform the data swap task between axes on a chart:

import aspose.slides.charts as charts
import aspose.slides as slides

# Creates empty presentation
with slides.Presentation() as pres:
    chart = pres.slides[0].shapes.add_chart(charts.ChartType.CLUSTERED_COLUMN, 100, 100, 400, 300)

    #Switches rows and columns
    chart.chart_data.switch_row_column()
            
    # Saves presentation
    pres.save("SwitchChartRowColumns_out.pptx", slides.export.SaveFormat.PPTX)

Disabling the Vertical Axis for Line Charts

This Python code shows you how to hide the vertical axis for a line chart:

import aspose.slides.charts as charts
import aspose.slides as slides

with slides.Presentation() as pres:
    chart = pres.slides[0].shapes.add_chart(charts.ChartType.LINE, 100, 100, 400, 300)
    chart.axes.vertical_axis.is_visible = False
    
    pres.save("chart-is_visible.pptx", slides.export.SaveFormat.PPTX)

Disabling the Horizontal Axis for Line Charts

This code shows you how to hide the horizontal axis for a line chart:

import aspose.slides.charts as charts
import aspose.slides as slides
 
with slides.Presentation() as pres:
    chart = pres.slides[0].shapes.add_chart(charts.ChartType.LINE, 100, 100, 400, 300)
    chart.axes.horizontal_axis.is_visible = False

    pres.save("chart-2.pptx", slides.export.SaveFormat.PPTX)

Changing Category Axis

Using the CategoryAxisType property, you can specify your preferred category axis type (date or text). This code in Python demonstrates the operation:

import aspose.slides.charts as charts
import aspose.slides as slides

with slides.Presentation(path + "ExistingChart.pptx") as presentation:
    chart = presentation.slides[0].shapes[0]
    chart.axes.horizontal_axis.category_axis_type = charts.CategoryAxisType.DATE
    chart.axes.horizontal_axis.is_automatic_major_unit = False
    chart.axes.horizontal_axis.major_unit = 1
    chart.axes.horizontal_axis.major_unit_scale = charts.TimeUnitType.MONTHS
    presentation.save("ChangeChartCategoryAxis_out.pptx", slides.export.SaveFormat.PPTX)

Setting the Date Format for Category Axis Value

Aspose.Slides for Python via .NET allows you to set the date format for a category axis value. The operation is demonstrated in this Python code:

import aspose.slides.charts as charts
import aspose.slides as slides
from datetime import date

def to_oadate(dt):
    delta = dt - date(1899, 12, 30)
    return delta.days + (delta.seconds + delta.microseconds / 1e6) / (24 * 3600)

with slides.Presentation() as pres:
    chart = pres.slides[0].shapes.add_chart(charts.ChartType.AREA, 50, 50, 450, 300)

    wb = chart.chart_data.chart_data_workbook

    wb.clear(0)

    chart.chart_data.categories.clear()
    chart.chart_data.series.clear()

    chart.chart_data.categories.add(wb.get_cell(0, "A2", to_oadate(date(2015, 1, 1))))
    chart.chart_data.categories.add(wb.get_cell(0, "A3", to_oadate(date(2016, 1, 1))))
    chart.chart_data.categories.add(wb.get_cell(0, "A4", to_oadate(date(2017, 1, 1))))
    chart.chart_data.categories.add(wb.get_cell(0, "A5", to_oadate(date(2018, 1, 1))))

    series = chart.chart_data.series.add(charts.ChartType.LINE)
    series.data_points.add_data_point_for_line_series(wb.get_cell(0, "B2", 1))
    series.data_points.add_data_point_for_line_series(wb.get_cell(0, "B3", 2))
    series.data_points.add_data_point_for_line_series(wb.get_cell(0, "B4", 3))
    series.data_points.add_data_point_for_line_series(wb.get_cell(0, "B5", 4))
    chart.axes.horizontal_axis.category_axis_type = charts.CategoryAxisType.DATE
    chart.axes.horizontal_axis.is_number_format_linked_to_source = False
    chart.axes.horizontal_axis.number_format = "yyyy"
    pres.save("test.pptx", slides.export.SaveFormat.PPTX)

Setting the Rotation Angle for Chart Axis Title

Aspose.Slides for Python via .NET allows you to set the rotation angle for a chart axis title. This Python code demonstrates the operation:

import aspose.slides.charts as charts
import aspose.slides as slides

with slides.Presentation() as pres:
    chart = pres.slides[0].shapes.add_chart(charts.ChartType.CLUSTERED_COLUMN, 50, 50, 450, 300)
    chart.axes.vertical_axis.has_title = True
    chart.axes.vertical_axis.title.text_format.text_block_format.rotation_angle = 90

    pres.save("test.pptx", slides.export.SaveFormat.PPTX)

Setting the Position Axis in a Category or Value Axis

Aspose.Slides for Python via .NET allows you to set the position axis in a category or value axis. This Python code shows how to perform the task:

import aspose.slides.charts as charts
import aspose.slides as slides

with slides.Presentation() as pres:
	chart = pres.slides[0].shapes.add_chart(charts.ChartType.CLUSTERED_COLUMN, 50, 50, 450, 300)
	chart.axes.horizontal_axis.axis_between_categories = True

	pres.save("AsposeScatterChart.pptx", slides.export.SaveFormat.PPTX)

Enabling the Display Unit label on Chart Value Axis

Aspose.Slides for Python via .NET allows you to configure a chart to show a unit label on its chart value axis. This Python code demonstrates the operation:

import aspose.slides.charts as charts
import aspose.slides as slides

with slides.Presentation() as pres:
	chart = pres.slides[0].shapes.add_chart(charts.ChartType.CLUSTERED_COLUMN, 50, 50, 450, 300)
	chart.axes.vertical_axis.display_unit = charts.DisplayUnitType.MILLIONS
	pres.save("Result.pptx", slides.export.SaveFormat.PPTX)