react-pinch-n-zoom v0.2.3

react-pinch-n-zoom

Trackpad based pinch, zoom, and pan support. Ideal for creating interactive visualizations.

How to use

If you don't need direct access to the transform values, you can simply wrap a component in the PinchNZoom component.

import PinchNZoom from 'react-pinch-n-zoom';

const App = () => {
  return (
    <PinchNZoom
      style={{
        width: '100%',
        height: '100vh',
        display: 'flex',
        alignItems: 'center',
        justifyContent: 'center',
      }}
    >
      <img
        src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9Ii0xMS41IC0xMC4yMzE3NCAyMyAyMC40NjM0OCI+CiAgPHRpdGxlPlJlYWN0IExvZ288L3RpdGxlPgogIDxjaXJjbGUgY3g9IjAiIGN5PSIwIiByPSIyLjA1IiBmaWxsPSIjNjFkYWZiIi8+CiAgPGcgc3Ryb2tlPSIjNjFkYWZiIiBzdHJva2Utd2lkdGg9IjEiIGZpbGw9Im5vbmUiPgogICAgPGVsbGlwc2Ugcng9IjExIiByeT0iNC4yIi8+CiAgICA8ZWxsaXBzZSByeD0iMTEiIHJ5PSI0LjIiIHRyYW5zZm9ybT0icm90YXRlKDYwKSIvPgogICAgPGVsbGlwc2Ugcng9IjExIiByeT0iNC4yIiB0cmFuc2Zvcm09InJvdGF0ZSgxMjApIi8+CiAgPC9nPgo8L3N2Zz4K"
        alt="react-logo"
        height="100"
      />
    </PinchNZoom>
  );
};

To get access to the transform values and setters, use the context providers and consumers. You can also use the useTransform hook to grab the transform context values in child components.

import { TransformComponent, TransformProvider, TransformConsumer } from '../.';

const App = () => {
  return (
    <TransformProvider>
      <TransformComponent
        style={{
          width: '100%',
          height: '500px',
          display: 'flex',
          alignItems: 'center',
          justifyContent: 'center',
          border: '2px dotted gray',
          borderRadius: 10,
          marginTop: 20,
          overflow: 'hidden',
        }}
      >
        <img
          src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9Ii0xMS41IC0xMC4yMzE3NCAyMyAyMC40NjM0OCI+CiAgPHRpdGxlPlJlYWN0IExvZ288L3RpdGxlPgogIDxjaXJjbGUgY3g9IjAiIGN5PSIwIiByPSIyLjA1IiBmaWxsPSIjNjFkYWZiIi8+CiAgPGcgc3Ryb2tlPSIjNjFkYWZiIiBzdHJva2Utd2lkdGg9IjEiIGZpbGw9Im5vbmUiPgogICAgPGVsbGlwc2Ugcng9IjExIiByeT0iNC4yIi8+CiAgICA8ZWxsaXBzZSByeD0iMTEiIHJ5PSI0LjIiIHRyYW5zZm9ybT0icm90YXRlKDYwKSIvPgogICAgPGVsbGlwc2Ugcng9IjExIiByeT0iNC4yIiB0cmFuc2Zvcm09InJvdGF0ZSgxMjApIi8+CiAgPC9nPgo8L3N2Zz4K"
          alt=""
          height="100"
        />
      </TransformComponent>
      <TransformConsumer>
        {({ scale, setScale, offsetX, setOffsetX, offsetY, setOffsetY }) => {
          return (
            <div style={{ display: 'flex', justifyContent: 'center' }}>
              <label>
                Scale
                <input
                  type="range"
                  value={scale}
                  min="0.2"
                  max="3"
                  step="0.05"
                  onChange={e => {
                    setScale(parseFloat(e.currentTarget.value));
                  }}
                />
              </label>
              <label>
                Offset X
                <input
                  type="number"
                  value={offsetX}
                  step="10"
                  onChange={e => {
                    setOffsetX(parseFloat(e.currentTarget.value));
                  }}
                />
              </label>
              <label>
                Offset Y
                <input
                  type="number"
                  value={offsetY}
                  step="10"
                  onChange={e => {
                    setOffsetY(parseFloat(e.currentTarget.value));
                  }}
                />
              </label>
            </div>
          );
        }}
      </TransformConsumer>
    </TransformProvider>
  );
};