GridPaper

GridPaper allows you to add controlling to a paper.js canvas. Major features include:

• Use cartesian coordinates. The positive direction of the y axis is to the top
• Show customizable grids on the paper.js canvas
• User-friendly interactions

Using GridPaper

GridPaper is written as a UMD library, and can be imported by either directly import with HTML <script/> tag, or makes it work as a module.

GridPaper needs paper.js as its dependency, so you should import or install paper.js first.

Directly

<script src="https://cdnjs.cloudflare.com/ajax/libs/paper.js/0.11.5/paper-full.min.js"></script>
<script src="dist/gridpaper.js"></script>

And the JavaScript part:

window.addEventListener('load', () => {
  window.gridPaper = new GridPaper({ elementID: 'preview' });
});

With modules

import GridPaper from 'gridpaper';

Set-up GridPaper

The prototype of the GridPaper constructor allows only one parameter which serves as the configuration object. The object must have the property elementID indicating the div id where GridPaper would initialize.

window.addEventListener('load', () => {
  window.gridPaper = new GridPaper({ elementID: 'preview' });
});

Constructor configuration

// Configurations
export interface Config {
  /** Div ID */
  elementID: string,
  /** 
   * A list of ordered pairs, indicating the grid units of the grid paper.
   * The ordered pairs start with the major grid unit, and end with the minor.
   * The list should be ranked in increasing order of the major grid units.
   */
  gridSeries?: number[][],
  /** Coordinate limits */
  bound?: Rect,
  /** Maximum major grid density */
  majorGridDensity?: number,
  /** Aspect locked */
  aspeckLocked?: true,
  /** Show grid */
  showGrid?: true
};

API

// The canvas to draw on
gridpaper.canvas
// Paper project instance
gridpaper.paperProject
// Paper tool instance
gridpaper.paperTool

TODOs

• Install directions
• Test multiple gridpapers

License

MIT