This document describes how to create Venn diagrams using the Chart API.

Table of Contents

Introduction

Venn diagrams are charts with overlapping circles that indicate how much different groups have in common. Charts supports Venn diagrams with two or three circles. You specify the relative sizes of the circles and the amount of overlap between them.

Chart Types (cht)

Specify a Venn diagram with the following syntax:

Syntax

cht=v

The data string is a set of up to seven elements, separated by the delimiter appropriate for your data format, as described here:

• The first three values specify the sizes of three circles: A, B, and C. For a chart with only two circles, specify zero for the third value.
• The fourth value specifies the size of the intersection of A and B.
• The fifth value specifies the size of the intersection of A and C. For a chart with only two circles, do not specify a value here.
• The sixth value specifies the size of the intersection of B and C. For a chart with only two circles, do not specify a value here.
• The seventh value specifies the size of the common intersection of A, B, and C. For a chart with only two circles, do not specify a value here.

Note that with Venn diagrams, all values are proportionate, not absolute. This means that a chart with values 10,20,30 will look the same as a chart with values 100,200,300 (if your encoding type accepts those values).

Description	Example
A three-circle Venn chart.	cht=v chd=t:100,80,60,30,30,30,10
To specify a two-circle chart, specify zero for circle C, and do not specify any overlap values that include C.	cht=v chd=t:100,100,0,50

Series Colors chco

You can specify the colors of all series, each series, or some series using the chco parameter.

Syntax

chco=<color_1>,...,<color_n>

<color>

Color of the series, in RRGGBB hexadecimal format. Specify different colors for different series by adding color values separated by a comma. If you have fewer colors than you have series, the last color is repeated, but in Venn charts, identical colors can make the chart hard to read.

Description	Example
A different color for each circle.	chco=FF6342,ADDE63,63C6DE
If there are fewer colors than circles, the last color specified is repeated. However, this makes the chart hard to read.	chco=00FF00,0000FF

Standard Features

The rest of the features on this page are standard chart features.