How to implement image cropping and image processing in uniapp

How to implement image cropping and image processing in uniapp

In uniapp, we often encounter the need to crop and process images, such as avatar uploading , picture editing, etc. This article will introduce how to implement image cropping and image processing in uniapp, and provide specific code examples.

1. Image cropping

In uniapp, you can use the official plug-in uni-image-cropper of uniapp to realize the image cropping function. uni-image-cropper is a canvas-based image cropping plug-in that supports cropping box dragging, scaling and rotation.

1. Install the uni-image-cropper plug-in:

Execute the following command in the root directory of the project to install the uni-image-cropper plug-in:

npm install uni-image-cropper

2. Use the uni-image-cropper plug-in:

Introduce the uni-image-cropper component into the page where you need to use the image cropping function, and set the corresponding parameters:

<template>
  <view>
    <uni-image-cropper 
      :src="imageSrc"
      :width="width"
      :height="height"
      :mode="mode"
      @imageCrop="handleImageCrop"
    ></uni-image-cropper>
  </view>
</template>

<script>
import uniImageCropper from 'uni-image-cropper';

export default {
  data() {
    return {
      imageSrc: '',
      width: 300,
      height: 300,
      mode: 'rectangle'
    };
  },
  methods: {
    handleImageCrop(event) {
      const { target, detail } = event;
      console.log('裁剪后的图片路径：', detail.path);
    }
  },
  mounted() {
    uniImageCropper.init({
      debug: false
    });
  }
};
</script>

In the above example, we use the uni-image-cropper component to display the image and obtain the cropped image path through the handleImageCrop method.

2. Image processing

In uniapp, you can use uniapp’s official plug-in uni-cropper to process images. uni-cropper is a canvas-based image processing plug-in that supports filtering, adjusting brightness, contrast, saturation and other operations on images.

1. Install the uni-cropper plug-in:

Execute the following command in the root directory of the project to install the uni-cropper plug-in:

npm install uni-cropper

2. Use uni-cropper plug-in:

Introduce the uni-cropper component into the page that needs to use the image processing function, and set the corresponding parameters:

<template>
  <view>
    <uni-cropper
      :width="width"
      :height="height"
      :src="imageSrc"
      @imageLoad="handleImageLoad"
      @imageProcessed="handleImageProcessed"
    ></uni-cropper>
  </view>
</template>

<script>
import uniCropper from 'uni-cropper';

export default {
  data() {
    return {
      imageSrc: '',
      width: 300,
      height: 300
    };
  },
  methods: {
    handleImageLoad(event) {
      const { target, detail } = event;
      console.log('图片加载完成');
    },
    handleImageProcessed(event) {
      const { target, detail } = event;
      console.log('图片处理完成', detail.path);
    }
  },
  mounted() {
    uniCropper.init({
      debug: true
    });
  }
};
</script>

In the above example, we use The uni-cropper component displays images, and obtains callbacks for image loading completion and processing completion through the handleImageLoad method and handleImageProcessed method respectively.

Summary:

Through the plug-ins uni-image-cropper and uni-cropper officially provided by uniapp, we can easily realize the functions of image cropping and image processing. During specific use, the plug-in can be adjusted and expanded according to your own needs.

(The above code is only an example, the specific implementation needs to be modified according to the actual situation)

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