Pie chart

Overview

A pie chart is divided into slices to illustrate numerical proportion. The entire circle represents 100% of the data, and each slice's size shows its percentage of the total. Simple Log Service offers three types of pie charts: pie chart, donut chart, and polar area chart.

• Donut chart: A donut chart is a pie chart with a hollow center. Compared to a standard pie chart, a donut chart offers the following advantages:

  • It provides more information by displaying a total value in the center.

  • It encourages viewers to compare the arc lengths of the slices rather than their central angles, which can make comparisons more intuitive.

• Polar area chart: This chart is a type of bar chart drawn in a polar coordinate system. Each category is given an equal segment of the circle, and the radius of each segment represents its data value. Compared to a pie chart, a polar area chart offers the following advantages:

  • Pie charts are best for datasets with fewer than 10 categories. Polar area charts are suitable for datasets with more categories (10 to 30).

  • Because the area of a slice is proportional to the square of its radius, a polar area chart amplifies the visual difference between values. This makes it ideal for comparing values that are close to each other.

  • A polar area chart is also well-suited for cyclical data, such as days of the week or months of the year, due to its circular layout.

For more information about how to add a chart, see Add a chart to a dashboard.

Examples

Configure a basic pie chart

1. Log on to the Simple Log Service console. In the Projects section, click the project you want.

   

2. In the left-side navigation pane, choose Dashboard > Dashboards. In the Dashboard list, click the dashboard you want. In the upper-right corner of the dashboard page, click Edit. In edit mode, choose Add > Add Chart.

3. On the right side of the page, configure the settings in the Chart type and Query and analysis configuration panels. On the left side of the page, specify the time range, Logstore, and query statement. Then, click Apply at the top of the page to see the chart preview.

   In the query and analysis configuration, set Category to http_user_agent and Value Column to pv.

   The following query statement calculates page views (PVs) by browser:

   (*)| select count(1) as pv, case when http_user_agent like '%Chrome%' then 'Chrome' when http_user_agent like '%Firefox%' then 'Firefox' when http_user_agent like '%Safari%' then 'Safari' else 'unKnown' end as http_user_agent  group by case when http_user_agent like '%Chrome%' then 'Chrome' when http_user_agent like '%Firefox%' then 'Firefox' when http_user_agent like '%Safari%' then 'Safari' else 'unKnown' end   order by pv desc limit 10 

General configurations

The General configurations panel contains global settings for the pie chart.

• Basic configurations

  Parameter	Description
  Title	The title of the chart.
  Display Title	After you turn on the Show Title switch, the title will be displayed in the pie chart.
  Display Border	When you turn on the Show Border switch, a border is displayed in the pie chart.
  Display Background	After you turn on the Show Background switch, a background color is displayed in the pie chart.
  Display Time	After you turn on the Show Time switch, the query time will be displayed in the pie chart.
  Fixed Time	Turning on the Fixed Time switch fixes the time for queries and analysis, so it is not affected by the dashboard's global time.

• Standard configurations

  Parameter	Description
  Format	The display format for numeric values.
  Unit	The unit for numeric values.
  Decimal places	The number of decimal places to display for numeric values.
  Display name	A custom display name for the chart.
  Color scheme	The color scheme for the pie chart. Built-in: Uses the built-in color palette. Solid: Uses a single color that you select.

• Query and analysis configuration

  Parameter	Description
  Category	The field used to categorize the data.
  Value column	The field that provides the numeric values for the chart.

• Pie chart configurations

  Parameter	Description
  Pie chart type	The type of pie chart. Valid values: Pie chart, donut chart, and polar area chart.
  Label format	The format of the labels displayed on the chart's slices. Percentage: The scale of the pie chart is displayed as a percentage, for example, 1.98%. Category: Percentage: The labels in the pie chart are displayed as Category: Percentage, such as PUT: 1.98%. Category: Value (Percentage): The labels in the pie chart are displayed in the Category: Value (Percentage) format, such as PUT: 120(1.98%).
  Show labels	Select Yes to display labels on the chart slices.

• Legend configurations

  Parameter	Description
  Display legend	After you turn on the Show Legend switch, the pie chart displays the legend.
  Legend position	The position of the legend on the chart.
  Action	The behavior when you click a legend item. Single select: When you click a legend item, the chart displays only the data corresponding to that item. Toggle: When you click a legend item, the data for that item is hidden. Click the item again to show the data.
  Max width (height) %	The maximum width or height of the legend as a percentage of the chart area.

• Variable substitution

  Parameter	Description
  Variable substitution	Variable substitution adds a variable-type filter to the chart. After configuration in General configurations, a filter appears in the upper-left corner of the chart. When you select a value, Simple Log Service replaces the variable in the query statement and reruns the analysis. Example 2: Set variable substitution.

• Documentation link

  Parameter	Description
  Add documentation link	Adds a custom documentation link or description. The information is displayed in the upper-right corner of the chart.

Field configuration

The Field configuration panel lets you apply custom visualization settings to the results of a single query or to a specific column within those results. For more information about the available options, see General configurations.

For example, A > pv lets you configure the pv field from query A. You can set Standard configurations > Color scheme to solid to display the data in a single color.

Interaction occurrences

Interaction Occurrences let you perform drill-down analysis on a specific field or query. Supported interaction occurrences include Open Logstore, Open Saved Search, Open Dashboard, Open Trace Analysis, Open Trace Details, and Create Custom HTTP URL. For more information, see Configure drill-down analysis for a dashboard by using interaction occurrences.