mermaid/docs/syntax/pie.md

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Pie chart diagrams

A pie chart (or a circle chart) is a circular statistical graphic, which is divided into slices to illustrate numerical proportion. In a pie chart, the arc length of each slice (and consequently its central angle and area), is proportional to the quantity it represents. While it is named for its resemblance to a pie which has been sliced, there are variations on the way it can be presented. The earliest known pie chart is generally credited to William Playfair's Statistical Breviary of 1801 -Wikipedia

Mermaid can render Pie Chart diagrams.

pie title Pets adopted by volunteers
    "Dogs" : 386
    "Cats" : 85
    "Rats" : 15

pie title Pets adopted by volunteers
    "Dogs" : 386
    "Cats" : 85
    "Rats" : 15

Syntax

Drawing a pie chart is really simple in mermaid.

• Start with pie keyword to begin the diagram
  • showData to render the actual data values after the legend text. This is OPTIONAL
• Followed by title keyword and its value in string to give a title to the pie-chart. This is OPTIONAL
• Followed by dataSet. Pie slices will be ordered clockwise in the same order as the labels.
  • label for a section in the pie diagram within " " quotes.
  • Followed by : colon as separator
  • Followed by positive numeric value (supported up to two decimal places)

pie] \[showData] (OPTIONAL)
\[title] \[titlevalue] (OPTIONAL)
"\[datakey1]" : \[dataValue1]
"\[datakey2]" : \[dataValue2]
"\[datakey3]" : \[dataValue3]
.
.

## Example

```mermaid-example
%%{init: {"pie": {"textPosition": 0.5}, "themeVariables": {"pieOuterStrokeWidth": "5px"}} }%%
pie showData
    title Key elements in Product X
    "Calcium" : 42.96
    "Potassium" : 50.05
    "Magnesium" : 10.01
    "Iron" :  5
```

```mermaid
%%{init: {"pie": {"textPosition": 0.5}, "themeVariables": {"pieOuterStrokeWidth": "5px"}} }%%
pie showData
    title Key elements in Product X
    "Calcium" : 42.96
    "Potassium" : 50.05
    "Magnesium" : 10.01
    "Iron" :  5
```

## Configuration

Possible pie diagram configuration parameters:

| Parameter      | Description                                                                                                  | Default value |
| -------------- | ------------------------------------------------------------------------------------------------------------ | ------------- |
| `textPosition` | The axial position of the pie slice labels, from 0.0 at the center to 1.0 at the outside edge of the circle. | `0.75`        |