lasso-canvas-image

Polygon selecting tool for HTML5 Image Element

Instalation

npm i lasso-canvas-image

Usage

// ES6 modules with Babel or TypeScript
import createLasso from 'lasso-canvas-image';

// CommonJS modules
const createLasso = require('lasso-canvas-image');

// Init
const lasso = createLasso({
  element: document.querySelector('img'),
  radius: 10,
  onChange (polygon) {
    console.log('Selection area changed: ' + polygon);
  },
  onUpdate (polygon) {
    console.log('Selection area updated: ' + polygon);
  }
});

// Methods
lasso.reset();
lasso.setPath('100,100 300,100 200,200');

lasso.disable();
lasso.enable();

Examples

Check out this example

Syntax

function createLasso ({
  element: HTMLImageElement,
  radius?: number,
  onChange?: (polygon: string) => void,
  onUpdate?: (polygon: string) => void,
  enabled?: boolean
})

Options

• element DOM HTMLImageElement Instance
• radius The radius of the circle's dots on the canvas
• onChange Runs when the selected area is updated or points are moved by the user
• onUpdate Runs when the selected area is updated
• enabled defaults to true