How to implement picture filter effects in uniapp

How to implement picture filter effects in uniapp

In mobile application development, picture filter effects are one of the common and popular functions among users. In uniapp, it is not complicated to implement picture filter effects. This article will introduce how to achieve image filter effects through uniapp, and attach relevant code examples.

1. Import pictures
   First, we need to import a picture into the uniapp project for subsequent filter effect processing. You can place an image named "filter.jpg" in the project's resource folder.
2. Create filter effects
   Next, we can add filter effects to images through css styles. You can use native CSS style syntax to set filter effects in uniapp. In the sample code, we added a class named "filter-effect" to the image and defined the filter effect in the scoped style.

Code example:

<template>
  <view class="container">
    <image :src="imagePath" class="filter-image"></image>
  </view>
</template>

<script>
export default {
  data() {
    return {
      imagePath: '@/assets/filter.jpg'
    }
  }
}
</script>

<style scoped>
.filter-image {
  filter: grayscale(100%);
}
</style>

In the above code, we added "filter-image" to the class of the image component, and set the grayscale filter effect through the filter attribute, so that The image changes to grayscale.

3. Add filter effect selector
   In order to allow users to freely choose filter effects, we can add a filter effect selector to the interface, and users can click on different filter effects to switch the display effect of the image in real time.

Code example:

<template>
  <view class="container">
    <image :src="imagePath" :class="currentFilter"></image>
    <view class="filter-list">
      <view
        v-for="(filter, index) in filterOptions"
        :key="index"
        class="filter-item"
        :class="currentFilter === filter ? 'active' : ''"
        @click="selectFilter(filter)"
      >
        {{ filter }}
      </view>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      imagePath: '@/assets/filter.jpg',
      currentFilter: '', // 当前选择的滤镜效果
      filterOptions: ['grayscale(100%)', 'sepia(100%)', 'brightness(50%)'] // 滤镜效果选项
    }
  },
  methods: {
    selectFilter(filter) {
      this.currentFilter = filter;
    }
  }
}
</script>

<style scoped>
.filter-item {
  display: inline-block;
  margin-right: 10px;
  cursor: pointer;
}

.filter-item.active {
  font-weight: bold;
}
</style>

In the above code, we dynamically generate a list of filter effect selectors through the v-for directive, and then switch by binding the selectFilter method to the click event The currently selected filter effect. At the same time, the active class is dynamically added according to the currently selected filter effect to achieve style changes in the selected state.

Through the above steps, we can achieve the picture filter effect in uniapp. Users can choose different filter effects according to their own needs and view changes in pictures in real time.

It should be noted that uniapp also supports more css filter effect attributes, such as blur, hue-rotate, saturate, etc. Can be adapted and expanded as needed. At the same time, in order to improve the user experience, you can also add animation effects to transition the switching of filter effects.

I hope the above content will be helpful to everyone in achieving picture filter effects in uniapp!

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