Vue モバイルが画像ジェスチャーのスケーリングと回転の問題を処理する方法

<template>
  <div ref="imageContainer" class="image-container">
    <img ref="image" :src="imageSrc" alt="image" />
  </div>
</template>

<script>
import Hammer from 'hammerjs';

export default {
  data() {
    return {
      imageSrc: 'path/to/image',
    };
  },
  mounted() {
    const element = this.$refs.imageContainer;
    const hammer = new Hammer(element);

    let currentScale = 1;
    let currentRotation = 0;

    hammer.get('pinch').set({ enable: true });
    hammer.get('rotate').set({ enable: true });

    hammer.on('pinch', (event) => {
      currentScale = event.scale;
      this.scaleImage(currentScale);
    });

    hammer.on('rotate', (event) => {
      currentRotation = event.rotation;
      this.rotateImage(currentRotation);
    });
  },
  methods: {
    scaleImage(scale) {
      const imageElement = this.$refs.image;
      imageElement.style.transform = `scale(${scale})`;
    },
    rotateImage(rotation) {
      const imageElement = this.$refs.image;
      imageElement.style.transform = `rotate(${rotation}deg)`;
    },
  },
};
</script>

<style>
.image-container {
  width: 100%;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
</style>

<template>
  <div ref="imageContainer" class="image-container">
    <img ref="image" :src="imageSrc" alt="image" 
      @touchstart="onTouchStart"
      @touchmove="onTouchMove"
      @touchend="onTouchEnd"
    />
  </div>
</template>

<script>
export default {
  data() {
    return {
      imageSrc: 'path/to/image',
      startX: 0,
      startY: 0,
      currentScale: 1,
      currentRotation: 0,
    };
  },
  methods: {
    onTouchStart(event) {
      const touch = event.touches[0];
      this.startX = touch.clientX;
      this.startY = touch.clientY;
    },
    onTouchMove(event) {
      const touch = event.touches[0];
      const offsetX = touch.clientX - this.startX;
      const offsetY = touch.clientY - this.startY;
      
      // 根据手势位移计算缩放比例和旋转角度
      this.currentScale = Math.sqrt(offsetX*offsetX + offsetY*offsetY);
      this.currentRotation = Math.atan2(offsetY, offsetX) * 180 / Math.PI;

      this.scaleImage(this.currentScale);
      this.rotateImage(this.currentRotation);
    },
    onTouchEnd() {
      // 清空缩放比例和旋转角度
      this.currentScale = 1;
      this.currentRotation = 0;
    },
    scaleImage(scale) {
      const imageElement = this.$refs.image;
      imageElement.style.transform = `scale(${scale})`;
    },
    rotateImage(rotation) {
      const imageElement = this.$refs.image;
      imageElement.style.transform = `rotate(${rotation}deg)`;
    },
  },
};
</script>

<style>
.image-container {
  width: 100%;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
</style>

<template>
  <div ref="imageContainer" class="image-container">
    <img ref="image" :src="imageSrc" alt="image" />
  </div>
</template>

<style>  
.image-container {
  width: 100%;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: transform 0.3s ease;
}

img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transform-origin: center center;
}
</style>