解锁物理世界：深入解析设备运动 API

            if (window.DeviceMotionEvent) {
  console.log("Device Motion is supported");
} else {
  console.log("Device Motion is not supported on this device.");
}

            

              
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            const permissionButton = document.getElementById('permission-button');

permissionButton.addEventListener('click', () => {
  // Check if the permission function exists
  if (typeof DeviceMotionEvent.requestPermission === 'function') {
    // iOS 13+ devices
    DeviceMotionEvent.requestPermission()
      .then(permissionState => {
        if (permissionState === 'granted') {
          window.addEventListener('devicemotion', handleMotionEvent);
          // Hide the button after permission is granted
          permissionButton.style.display = 'none';
        } else {
          // Handle permission denial
          alert('Permission to access motion sensors was denied.');
        }
      })
      .catch(console.error); // Handle potential errors
  } else {
    // Non-iOS 13+ devices
    window.addEventListener('devicemotion', handleMotionEvent);
    // You might also want to hide the button here as it's not needed
    permissionButton.style.display = 'none';
  }
});

function handleMotionEvent(event) {
  // Data handling logic goes here...
  console.log(event);
}

            

              
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            function handleMotionEvent(event) {
  const acceleration = event.acceleration;
  const gravity = event.accelerationIncludingGravity;
  const rotation = event.rotationRate;
  const interval = event.interval;

  // For demonstration, let's display the data
  const dataContainer = document.getElementById('data-container');

  dataContainer.innerHTML = `
    <h3>Acceleration (without gravity)</h3>
    <p>X: ${acceleration.x ? acceleration.x.toFixed(3) : 'N/A'}</p>
    <p>Y: ${acceleration.y ? acceleration.y.toFixed(3) : 'N/A'}</p>
    <p>Z: ${acceleration.z ? acceleration.z.toFixed(3) : 'N/A'}</p>

    <h3>Acceleration (including gravity)</h3>
    <p>X: ${gravity.x ? gravity.x.toFixed(3) : 'N/A'}</p>
    <p>Y: ${gravity.y ? gravity.y.toFixed(3) : 'N/A'}</p>
    <p>Z: ${gravity.z ? gravity.z.toFixed(3) : 'N/A'}</p>

    <h3>Rotation Rate</h3>
    <p>Alpha (z): ${rotation.alpha ? rotation.alpha.toFixed(3) : 'N/A'}</p>
    <p>Beta (x): ${rotation.beta ? rotation.beta.toFixed(3) : 'N/A'}</p>
    <p>Gamma (y): ${rotation.gamma ? rotation.gamma.toFixed(3) : 'N/A'}</p>

    <h3>Update Interval</h3>
    <p>${interval.toFixed(3)} ms</p>
  `;
}

            

              
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            let lastX, lastY, lastZ;
let moveCounter = 0;
const shakeThreshold = 15; // Experiment with this value

function handleShake(event) {
  const { x, y, z } = event.accelerationIncludingGravity;

  if (lastX !== undefined) {
    const deltaX = Math.abs(lastX - x);
    const deltaY = Math.abs(lastY - y);
    const deltaZ = Math.abs(lastZ - z);

    if (deltaX + deltaY + deltaZ > shakeThreshold) {
      moveCounter++;
    } else {
      moveCounter = 0;
    }

    if (moveCounter > 3) { // Trigger after a few rapid movements
      console.log('Shake detected!');
      // Trigger your action here, e.g., shufflePlaylist();
      moveCounter = 0; // Reset counter to avoid multiple triggers
    }
  }

  lastX = x;
  lastY = y;
  lastZ = z;
}

// Add 'handleShake' as your event listener callback

            

              
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            const bubble = document.getElementById('bubble');
const MAX_TILT = 10; // Corresponds to 9.81 m/s^2

function handleSpiritLevel(event) {
  const { x, y } = event.accelerationIncludingGravity;

  // Map the acceleration values to a CSS transform
  // Clamp the values to a reasonable range for a better visual effect
  const tiltX = Math.min(Math.max(y, -MAX_TILT), MAX_TILT) * -5; // Invert and scale
  const tiltY = Math.min(Math.max(x, -MAX_TILT), MAX_TILT) * 5;  // Scale

  bubble.style.transform = `translateX(${tiltY}px) translateY(${tiltX}px)`;
}

// Add 'handleSpiritLevel' as your event listener callback

            

              
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            const scene = document.getElementById('scene');
let currentRotation = { beta: 0, gamma: 0 };
let lastTimestamp = 0;

function handleLookAround(event) {
  if (lastTimestamp === 0) {
    lastTimestamp = event.timeStamp;
    return;
  }

  const delta = (event.timeStamp - lastTimestamp) / 1000; // Time delta in seconds
  lastTimestamp = event.timeStamp;

  const rotation = event.rotationRate;
  if (!rotation) return; // No gyroscope data

  // Integrate rotation rate over time to get the angle change
  currentRotation.beta += rotation.beta * delta;
  currentRotation.gamma += rotation.gamma * delta;

  // Apply rotation to the scene element using CSS transform
  // Note: The axes might need to be swapped or inverted depending on desired effect
  scene.style.transform = `rotateX(${-currentRotation.beta}deg) rotateY(${-currentRotation.gamma}deg)`;
}

// Add 'handleLookAround' as your event listener callback

            

              
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            let smoothedX = 0, smoothedY = 0;
const filterFactor = 0.1; // Value between 0 and 1. Lower is smoother but has more lag.

function handleSmoothedMotion(event) {
  const { x, y } = event.accelerationIncludingGravity;

  smoothedX = (x * filterFactor) + (smoothedX * (1.0 - filterFactor));
  smoothedY = (y * filterFactor) + (smoothedY * (1.0 - filterFactor));

  // Use smoothedX and smoothedY in your application logic
}

            

              
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            // Generic Sensor API example
const accelerometer = new Accelerometer({ frequency: 60 });

accelerometer.addEventListener('reading', () => {
  console.log(`Acceleration along the X-axis: ${accelerometer.x}`);
  console.log(`Acceleration along the Y-axis: ${accelerometer.y}`);
  console.log(`Acceleration along the Z-axis: ${accelerometer.z}`);
});

accelerometer.addEventListener('error', event => {
  console.log(event.error.name, event.error.message);
});

accelerometer.start();

            

              
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