fisheye

Easily create a fisheye effect anywhere you need it.

Demo

Parameters

You just need to provide few things:

• a origin {x,y} that is generally the mouse position you need to pass
• a list of items with {x,y}

You can provide different parameters for the fisheye effect but there are already set by default so it's not mandatory :

• distortion
• radius

The function will return a list of items {x,y,scale} according to the fisheye parameters.

How you use those values is up to you, but generally, you already have a function to draw your items with {x,y} that you can just reuse.

Example

import fisheye from 'fisheye';

const items = [
  { x: 10, y: 20 },
  { x: 20, y: 15 },
];

// draw(items);

const f = fisheye();
// const f = fisheye(4, 300); // more distortion, bigger radius

const mousePointer = { x: 15, y: 15 };
const itemsFisheyed = items.map(f(mousePointer));
// draw(itemsFisheyed);

// [
//   { x: 5.3756834868953,
//     y: 24.624316513104702,
//     scale: 1.92486330262094 },
//   { x: 24.710604651796842,
//     y: 15,
//     scale: 1.9421209303593685 }
// ]

Following mouse pointer

Most likely, you'll do something following the mouse pointer, such as:

onMouseMove(e) {
  const transform = f({ x: e.clientX, y: e.clientY });
  const items = this.state.items.map(transform);
  this.setState({ items });
}