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PolygonFromSprite

Example

What does this library do?

This is a header only C++ library which creates polygons (arrays of vertices) from input PNG sprites.

Requirements

SFML-2.4.2 or later is required as this library makes use of SFML's sf::Image class for loading, reading, and modifying input images.

Installation

Simply copy VerticesFromBitmap.hpp to your project and #include the header.

Usage

Create a VerticesFromBitmap object and call VerticesFromBitmap::generateIslands(image) where image is of type sf::Image . The function will return an array of Island ; each Island is an array of Vec2 positions representing vertices of a closed polygon.

Demo

This repo comes with a demo to try out before usage:

  1. Place any .png file named test.png into the same directory as the .exe.
  2. Open the .exe file and the polygon will automatically be rendered.

Controls

Reload image: R

Display .png image in background: D

Switch between aliased and original image: S

Double minimum distance between vertices: Num1

Halve minimum distance between vertices: Num2

Double vertex rendered size: PgUp

Halve vertex rendered size: PgDn

Increase co-linear threshold: L

Decrease co-linear threshold: K