https://github.com/zeraye/polygon-editor

polygon-editor is a desktop polygon editor with multi-os support. It allows you to create, edit and delete polygonal chains
https://github.com/zeraye/polygon-editor

polygon polygon-editor polygon-offsetting

Last synced: 5 months ago
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polygon-editor is a desktop polygon editor with multi-os support. It allows you to create, edit and delete polygonal chains

• Host: GitHub
• URL: https://github.com/zeraye/polygon-editor
• Owner: zeraye
• Created: 2023-10-15T18:15:05.000Z (over 2 years ago)
• Default Branch: master
• Last Pushed: 2025-03-04T21:22:57.000Z (about 1 year ago)
• Last Synced: 2025-05-06T09:52:55.906Z (about 1 year ago)
• Topics: polygon, polygon-editor, polygon-offsetting
• Language: Go
• Homepage:
• Size: 15.7 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md

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README

          
# polygon-editor

**polygon-editor** is a desktop polygon editor with [multi-os support](https://github.com/fyne-io/fyne/wiki/Supported-Platforms). It allows you to create, edit and delete polygonal chains.

## installation

(Go 1.21)[https://go.dev/doc/install]

(Fyne)[https://developer.fyne.io/]

(Fyne dependencies)[https://developer.fyne.io/started/]

## controls

List of controls:

- LMB on segment: select segment and polygon

- LMB not on segment: create new circle

- RMB on circle: delete circle

- RMB on segment: add new circle in the middle of the segment

- LMB DRAG on circle: move circle

- LMB DRAG on segment: move segment

- LMB DRAG on polygon: move polygon

Legend:

- LMB: left mouse button

- RMB: right mouse button

- LMB DRAG: left mouse button press while moving mouse

## featues

List of featuers:

- create circle

- create polygon

- create new circle in the middle of the segment

- remove circle

- move circle

- move segment

- move polygon

- add horizontal constraint to segment

- add vertical constraint to segment

- remove contraint from segment

- create offset to polygon

- manage multiple polygons

## drawing

Circles are drawn using [midpoint circle algoritm](https://en.wikipedia.org/wiki/Midpoint_circle_algorithm).

Lines are drawn using:

- [Bresenham'slinealgorithm](https://en.wikipedia.org/wiki/Bresenham's_line_algorithm)

- [Xiaolin Wu's line algorithm](https://en.wikipedia.org/wiki/Xiaolin_Wu's_line_algorithm) (anti-aliasing)

## offset

Offset algorithm calculates offset points by creating two normals. We add prev segment normal and next segment normal, to get offset polygon point. For concave angle 3 points are created (which next repair algorithm will fix if intersections was introduced). Then fix algorithm looks for intersections. Remove intersections loops (removing intersections) to create proper offset.

## screenshots

![polygons](images/polygons.png)

![constraint selector](images/constraint.png)

![offset](images/offset.png)

## author

Author of this project is Jakub Rudnik.