# VectorPaint set diagrams: match overlap regions to membership

Language: en
Canonical: [VectorPaint set diagrams: match overlap regions to membership](<https://allluckly.cn/en/guides/vectorpaint-set-membership-diagram/>)
中文：[中文 HTML](<https://allluckly.cn/guides/vectorpaint-set-membership-diagram/>)
English: [English HTML](<https://allluckly.cn/en/guides/vectorpaint-set-membership-diagram/>)
Published: 2026-10-27T00:00:00+08:00
Modified: 2026-10-27T13:09:55+08:00
Author: Bison

Draw two sets with fictional entries, checking intersection, exclusive regions and a legend without treating colour blending as calculation.

English translation of the [Chinese original](<https://allluckly.cn/guides/vectorpaint-set-membership-diagram/>), translated on 2026-10-27. Original publication dates, attribution, code and version notes are retained.

A set diagram shows which entries meet two conditions. Use fictional print and ebook lists to arrange exclusive and shared regions with two circles and labels. The drawing does not determine membership; establish the list first.

## Define both conditions and their members

List six fictional books and mark print/ebook availability, deriving print-only, both and ebook-only groups. Keep conditions comparable. Reserve headings and a legend on a 1000 by 700 pixel canvas. Entries meeting neither condition belong outside both circles if shown. Verify membership before drawing; placement and colour do not establish facts.

## Create three readable regions with two circles

Duplicate one circle and overlap them horizontally. Equal circles express equal visual treatment, not equal member counts. Inspect outlines first and leave usable shared and exclusive regions. Keep headings associated with their circles. Establish space for all labels before adding translucent fills.

## Use blending only as a visual aid

Apply distinct pale translucent fills, but label the intersection explicitly as both. Its blended colour is a visual result, not computed membership. Check stacking effects and readability on light and dark backgrounds. A deliberate backing panel may be more reliable than forcing transparency everywhere.

## Place each entry from the verified list

Place entries into their verified exclusive or shared regions using consistent editable text. Wrap long names without crossing boundaries. Count displayed entries against the list. A member of both sets appears once in the intersection, not as two copies in the exclusive areas. Exclude duplicates already removed from the source list.

## Separate condition definitions from count claims

State the scope and date of the comparison. Explicitly say that area is not proportional to counts when it is not. Show separately verified counts if needed and distinguish whole-set totals from exclusive-region counts. Do not add both set totals without accounting for shared members.

## Test one membership change

Change one print-only book to both in a copy: update the list, move its label and revise counts. Check for stale duplicates. Circle positions need change only for readability. Test a neither-condition entry outside the circles too. Deliver only the membership state verified for the final revision.

## Inspect boundaries and small text after export

Save and inspect exported boundaries, intersection heading and longest entry at actual width. Recheck transparency against backgrounds. Keep condition definitions and scope with report graphics. Match image and list revisions, then reopen the delivery file and identify the region of every entry.

## Resolve ambiguity through wording first

Clarify both-condition wording if the intersection is mistaken for a third set. Reposition crossing labels instead of recolouring them to conceal ambiguity. Inspect strokes and stacking for missing boundaries. Resolve count discrepancies in the source list. A monochrome check should preserve membership through labels and boundaries.

## Related tutorials and sources

[VectorPaint two-colour overlaps: compare opacity and stacking order](<https://allluckly.cn/en/guides/vectorpaint-transparent-overlap/>), [VectorPaint comparison sheets: show three options in consistent columns](<https://allluckly.cn/en/guides/vectorpaint-comparison-sheet/>).

Checked on October 27, 2026 using [Apple public version information](<https://itunes.apple.com/lookup?id=1587272880&country=cn>): VectorPaint 1.0.8, requiring iOS / iPadOS 17 or later. Capability scope follows the [official App Store listing](<https://apps.apple.com/cn/app/id1587272880>) and corresponding controls. These are reproducible workflows and checks, without a claim of step-by-step physical-device, private-server or target-software testing. Dimensions, data and copy are exercises; follow your installed version.