Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                [[[https://codepen.io/inlet/pen/2b7da2053276c634928a7eca450648c8]]]
              
            
!

CSS

              
                body {
  height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
}

#root {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

canvas {
  background: #efefef;
  box-shadow: 3px 3px 0 #ccc;
}

.buttons-group > button {
  margin: 0 0.25rem;
  font-family: system-ui;
  border: none;
  padding: 0.5rem 0.8rem;
  background: #efefef;
  box-shadow: 3px 3px 0 #ccc;
}

              
            
!

JS

              
                console.clear();

const { useState, useEffect, useMemo, useCallback, useRef, forwardRef } = React;
const { Stage, Container, Sprite, PixiComponent, useApp, useTick } = ReactPixi;
const { Texture } = PIXI;

PIXI.settings.SCALE_MODE = PIXI.SCALE_MODES.NEAREST;

const width = 500;
const height = 500;

const stageOptions = {
  antialias: true,
  autoDensity: true,
  backgroundAlpha: 0
};

const areas = {
  'world': [1000, 1000, 2000, 2000],
  'center': [1000, 1000, 400, 400],
  'tl': [100, 100, 200, 200],
  'tr': [1900, 100, 200, 200],
  'bl': [100, 1900, 200, 200],
  'br': [1900, 1900, 200, 200]
};

useIteration = (incr = 0.1) => {
  const [i, setI] = React.useState(0);
  
  useTick((delta) => {
    setI(i => i + incr * delta);
  });

  return i;
};

// create and instantiate the viewport component
// we share the ticker and interaction from app
const PixiViewportComponent = PixiComponent("Viewport", {
  create(props) {
    const { app, ...viewportProps } = props;

    const viewport = new Viewport.Viewport({
      ticker: props.app.ticker,
      interaction: props.app.renderer.plugins.interaction,
      ...viewportProps
    });

    // activate plugins
    (props.plugins || []).forEach((plugin) => {
      viewport[plugin]();
    });

    return viewport;
  },
  applyProps(viewport, _oldProps, _newProps) {
    const { plugins: oldPlugins, children: oldChildren, ...oldProps } = _oldProps;
    const { plugins: newPlugins, children: newChildren, ...newProps } = _newProps;

    Object.keys(newProps).forEach((p) => {
      if (oldProps[p] !== newProps[p]) {
        viewport[p] = newProps[p];
      }
    });
  },
  didMount() {
    console.log("viewport mounted");
  }
});

// create a component that can be consumed
// that automatically pass down the app
const PixiViewport = forwardRef((props, ref) => (
  <PixiViewportComponent ref={ref} app={useApp()} {...props} />
));

// Wiggling bunny
const Bunny = forwardRef((props, ref) => {
  // abstracted away, see settings>js
  const i = useIteration(0.1);
  
  return (
    <Sprite
      ref={ref}
      image="https://s3-us-west-2.amazonaws.com/s.cdpn.io/693612/IaUrttj.png"
      anchor={0.5}
      scale={2}
      rotation={Math.cos(i) * 0.98}
      {...props}
    />
  );
});

// 4 squared bunnies
// positioned by its name
const BunniesContainer = ({ name, ...props }) => {
  const [x, y] = areas[name];
  
  return (
    <Container x={x} y={y} {...props}>
      <Bunny x={-50} y={-50} />
      <Bunny x={50} y={-50} />
      <Bunny x={-50} y={50} />
      <Bunny x={50} y={50} />
    </Container>
  );
}

const BunnyFollowingCircle = forwardRef(({x, y, rad}, ref) => {
  const i = useIteration(0.02);
  return <Bunny ref={ref} x={x + Math.cos(i) * rad} y={y + Math.sin(i) * rad} scale={6} />
});

// the main app
const App = () => {
  // get the actual viewport instance
  const viewportRef = useRef();
  
  // get ref of the bunny to follow
  const followBunny = useRef();
  
  // interact with viewport directly
  // move and zoom to specified area
  const focus = useCallback((p) => {
    const viewport = viewportRef.current;
    const [x, y, width, height] = areas[p];
    
    // pause following
    viewport.plugins.pause('follow');
    
    // and snap to selected
    viewport.snapZoom({ width, height, removeOnComplete: true });
    viewport.snap(x, y, { removeOnComplete: true });
  }, []);
  
  const follow = useCallback(() => {
    const viewport = viewportRef.current;
    
    viewport.snapZoom({ width: 1000, height: 1000 });
    viewport.follow(followBunny.current, { speed: 20 });
  }, []);
 
  return (
    <>
      <div class="buttons-group">
        <button onClick={() => focus('world')}>Fit</button>
        <button onClick={() => focus('center')}>Center</button>
        <button onClick={() => focus('tl')}>TL</button>
        <button onClick={() => focus('tr')}>TR</button>
        <button onClick={() => focus('bl')}>BL</button>
        <button onClick={() => focus('br')}>BR</button>
        
        <button onClick={() => follow()}>Follow</button>
      </div>
      
      <Stage width={width} height={height} options={stageOptions}>
        <PixiViewport
          ref={viewportRef}
          plugins={["drag", "pinch", "wheel", "decelerate"]}
          screenWidth={width}
          screenHeight={height}
          worldWidth={2000}
          worldHeight={2000}
        >
          <BunniesContainer name="tl" />
          <BunniesContainer name="tr" />
          <BunniesContainer name="bl" />
          <BunniesContainer name="br" />
          <BunniesContainer name="center" scale={2} />
          
          <BunnyFollowingCircle x={1000} y={1000} rad={500} ref={followBunny} />
        </PixiViewport>
      </Stage>
    </>
  );
};

ReactDOM.render(<App />, document.getElementById("root"));

              
            
!
999px

Console