我在将最近上传的照片显示到表单时遇到问题。如果图像是通过电话制作的,它可能有一个exif属性,但浏览器不处理这个属性,事实证明图片可以翻转或侧面翻转。
我用exif-js库解决了这个问题。写完(在某些网站上被盗)一个组件并花了很多时间,我在加载和处理过程中实现了这一点,图片转向了正确的方向。
但是在测试期间,我们发现在iPhone上,如果你不是从照片下载,而是手动垂直拍照,那么图片通常会超出div到左下角。
之后,所有其他照片也显示不正确。在Android设备上一切都很好。
在这个img-tag中:src动态变化,我也需要动态“变换”,所以我需要使用updated()方法。我知道这是不好的代码,但......
用法:
<div class="form-group">
<div class="row">
<div class="col-md-6 edit-activity-images">
<auto-rotate><img class="edit-activity-images-inner" alt="activity"
:src="getUploadedImageBackground()||staticFile('images/img-place-holder.png')"
></auto-rotate>
样式
edit-activity-images-inner{
object-fit: cover;
width: 100%;
height: 100%;
}
零件
<template>
<div class="holder">
<slot></slot>
</div>
</template>
<script>
import imagesLoaded from 'imagesloaded'
import EXIF from 'exif-js'
const rotateAngles = [
{},
{y: 0, z: 0},
{y: 180, z: 0},
{y: 0, z: 180},
{y: 180, z: 180},
{y: 180, z: -90},
{y: 0, z: -90},
{y: 180, z: 90},
{y: 0, z: 90}
];
function getOrientation(el) {
return new Promise(function (resolve) {
imagesLoaded(el, function () {
EXIF.getData(el, function () {
const orientation = EXIF.getTag(this, 'Orientation');
resolve(orientation);
})
})
})
}
function getRotationAngle(newOrientation, oldOrientation) {
const y = rotateAngles[newOrientation].y - rotateAngles[oldOrientation].y;
let z = rotateAngles[newOrientation].z - rotateAngles[oldOrientation].z;
if (y)
z = z * -1;
return { y, z }
}
const recently_added = {};
const havent_exif = {};
export default {
name: "AutoRotate",
updated() {
const slot = this.$slots.default[0];
if (slot.tag !== 'img') {
console.error('Warning: slot should be an img tag.');
return;
}
const holder = this.$el;
const img = holder.childNodes[0];
img.exifdata = undefined;
if (recently_added[img.src]) {
img.style['transform'] = recently_added[img.src];
return
} else if (havent_exif[img.src]) {
img.style['transform'] = "translate(0px, 0px) rotateY(0deg) rotateZ(0deg)";
return;
}
getOrientation(img).then(function (currentOrientation) {
if (currentOrientation !== undefined) {
const angle = getRotationAngle(1, currentOrientation);
const transform = `rotateY(${angle.y}deg) rotateZ(${angle.z}deg)`;
let translate = '';
if (angle.z % 180 !== 0) {
const height = img.clientHeight;
const width = img.clientWidth;
translate = `translate(${(height - width) / 2}px, ${(width - height) / 2}px)`;
holder.style['width'] = `${height}px`;
holder.style['height'] = `${width}px`;
}
img.style['vertical-align'] = 'bottom';
img.style['transform'] = translate + ' ' + transform;
recently_added[img.src] = translate + ' ' + transform;
} else {
havent_exif[img.src] = true;
if (!recently_added[img.src]) {
img.style['transform'] = "translate(0px, 0px) rotateY(0deg) rotateZ(0deg)";
}
}
})
}
}
<style scoped>
.holder {
object-fit: cover;
width: 100%;
height: 100%;
}
</style>
好吧,希望有人能帮助我,写下我能做些什么......
好吧,我删除了这部分代码,因为它的工作原理不正确。它完成了......
if (angle.z % 180 !== 0) {
const height = img.clientHeight;
const width = img.clientWidth;
translate = `translate(${(height - width) / 2}px, ${(width - height) / 2}px)`;
holder.style['width'] = `${height}px`;
holder.style['height'] = `${width}px`;
}