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我有一个 Vue 组件,我可以在其中放大图像,然后在容器周围移动它。缩放时还有一个小视口(viewport)来显示图像的哪一部分可见。但是,当在它周围移动图像时,它的移动速度比鼠标快,我猜这是由于使用了 scale
转换。
我也觉得当我在视口(viewport)上单击并拖动时,我不应该两次反转值,但这似乎是让它用鼠标移动方 block 的唯一方法。
Vue.component('test', {
template: '#template',
data: function() {
return {
loading: true,
loop: true,
speed: 8,
speedController: 0,
zoomEnabled: true,
zoomLevels: [1, 1.5, 2, 2.5, 3],
zoomLevel: 1,
frame: 1,
images: [],
imagesPreloaded: 0,
reverse: false,
viewportScale: 0.3,
viewportEnabled: true,
viewportOpacity: 0.8,
lastX: 0,
lastY: 0,
startX: 0,
startY: 0,
translateX: 0,
translateY: 0,
isMoving: false,
isDragging: false,
};
},
mounted() {
window.addEventListener('mouseup', this.handleEnd);
window.addEventListener('touchend', this.handleEnd);
},
beforeDestroy() {
window.removeEventListener('mouseup', this.handleEnd);
window.removeEventListener('touchend', this.handleEnd);
},
methods: {
handleSlider(event) {
this.frame = Number(event.target.value);
},
zoom(direction) {
const closest = this.zoomLevels.reduce((a, b) => {
return Math.abs(b - this.zoomLevel) < Math.abs(a - this.zoomLevel) ? b : a;
});
if (this.zoomLevels[this.zoomLevels.indexOf(closest) + direction] === undefined) {
return;
}
let current = this.zoomLevels.indexOf(closest);
let index = current += direction;
if (direction === 0) {
index = 0;
}
this.zoomLevel = this.zoomLevels[index];
window.requestAnimationFrame(() => {
this.translate(null, this.$refs.image, true);
});
},
zoomWheel($event) {
$event.preventDefault();
this.zoomLevel += $event.deltaY * -0.01;
if (this.zoomLevel < 1) {
this.zoomLevel = 1;
}
let maxZoom = this.zoomLevels[this.zoomLevels.length - 1];
this.zoomLevel = Math.min(Math.max(.125, this.zoomLevel), maxZoom);
window.requestAnimationFrame(() => {
this.translate(null, this.$refs.image, true);
});
},
handleStart($event) {
$event.preventDefault();
if ($event.button && $event.button !== 0) {
return;
}
this.isMoving = true;
this.isDragging = true;
this.startX = $event.pageX || $event.touches[0].pageX;
this.startY = $event.pageY || $event.touches[0].pageY;
},
handleMove($event, viewport) {
if ($event.button && $event.button !== 0) {
return;
}
if (this.isMoving && this.isDragging) {
const positions = {
x: $event.pageX || $event.touches[0].pageX,
y: $event.pageY || $event.touches[0].pageY
}
if (this.zoomLevel !== 1) {
this.translate(positions, $event.target, null, viewport);
}
if (this.zoomLevel === 1) {
this.changeFrame(positions);
}
}
},
handleEnd($event) {
if ($event.button && $event.button !== 0) {
return;
}
this.isMoving = false;
},
translate(positions, element, zooming, viewport) {
if (positions === null) {
positions = {
x: this.startX,
y: this.startY
};
}
let move = {
x: Math.floor(positions.x - this.startX),
y: Math.floor(positions.y - this.startY)
};
// Reverse Mouse Movement
if (viewport) {
move.x = -move.x;
move.y = -move.y;
}
let image = element.getBoundingClientRect();
let container = element.parentNode.getBoundingClientRect();
let translate = {
left: Math.floor((container.left - image.left) - (move.x * this.zoomLevel)),
right: Math.floor((container.right - image.right) - (move.x * this.zoomLevel)),
top: Math.floor((container.top - image.top) - (move.y * this.zoomLevel)),
bottom: Math.floor((container.bottom - image.bottom) - (move.y * this.zoomLevel))
};
// Reverse Translate Movement
if (viewport) {
translate.left = -translate.left;
translate.right = -translate.right;
translate.top = -translate.top;
translate.bottom = -translate.bottom;
}
if (zooming) {
if (translate.left <= 0) {
this.translateX += Math.floor(translate.left);
}
if (translate.right >= 0) {
this.translateX += Math.floor(translate.right);
}
if (translate.top <= 0) {
this.translateY += Math.floor(translate.top);
}
if (translate.bottom >= 0) {
this.translateY += Math.floor(translate.bottom);
}
}
if (translate.left >= 0 && translate.right <= 0) {
this.translateX += Math.floor(move.x);
}
if (translate.top >= 0 && translate.bottom <= 0) {
this.translateY += Math.floor(move.y);
}
this.startX = positions.x;
this.startY = positions.y;
}
},
computed: {
nextZoomLevel: function() {
const closest = this.zoomLevels.reduce((a, b) => {
return Math.abs(b - this.zoomLevel) < Math.abs(a - this.zoomLevel) ? b : a;
});
if (this.zoomLevels.indexOf(closest) === this.zoomLevels.length - 1) {
return this.zoomLevels[0];
}
return this.zoomLevels[this.zoomLevels.indexOf(closest) + 1];
},
viewportTransform: function() {
if (this.viewportEnabled) {
let translateX = -((this.translateX * this.viewportScale) * this.zoomLevel);
let translateY = -((this.translateY * this.viewportScale) * this.zoomLevel);
return `scale(${1 / this.zoomLevel}) translateX(${translateX}px) translateY(${translateY}px)`;
}
},
transform: function() {
return `scale(${this.zoomLevel}) translateX(${this.translateX}px) translateY(${this.translateY}px)`;
},
canZoomIn: function() {
const closest = this.zoomLevels.reduce((a, b) => {
return Math.abs(b - this.zoomLevel) < Math.abs(a - this.zoomLevel) ? b : a;
});
return this.zoomLevels[this.zoomLevels.indexOf(closest) + 1] === undefined
},
canZoomOut: function() {
const closest = this.zoomLevels.reduce((a, b) => {
return Math.abs(b - this.zoomLevel) < Math.abs(a - this.zoomLevel) ? b : a;
});
return this.zoomLevels[this.zoomLevels.indexOf(closest) + -1] === undefined
}
}
});
window.vue = new Vue({el: '#app'});
.media-360-viewer {
position: relative;
overflow: hidden;
background: #000;
}
.media-360-viewer>img {
width: 100%;
}
.media-360-viewer>img.canTranslate {
cursor: grab;
}
.media-360-viewer>img.isTranslating {
cursor: grabbing;
}
.media-360-viewer>img.canRotate {
cursor: w-resize;
}
.media-360-viewer__loader {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.5);
}
.media-360-viewer__loader * {
user-select: none;
}
.media-360-viewer__loader>svg {
width: 100%;
height: 100%;
transform: rotate(270deg);
}
.media-360-viewer__loader--text {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
display: flex;
justify-content: center;
align-items: center;
flex-direction: column;
}
.media-360-viewer__loader--text p {
font-size: 100%;
font-weight: bold;
color: #fff;
}
.media-360-viewer__loader--text p.large {
font-size: 150%;
}
.media-360-viewer__loader--background {
stroke-dasharray: 0;
stroke-dashoffset: 0;
stroke: rgba(0, 0, 0, 0.7);
stroke-width: 25px;
}
.media-360-viewer__loader--cover {
stroke-dasharray: 200%;
stroke: #848484;
stroke-width: 15px;
stroke-linecap: round;
}
.media-360-viewer__loader--background,
.media-360-viewer__loader--cover {
fill: transparent;
}
.media-360-viewer__viewport {
position: absolute;
top: 10px;
left: 10px;
z-index: 2;
border: 1px solid black;
overflow: hidden;
}
.media-360-viewer__viewport--image {
width: 100%;
pointer-events: none;
}
.media-360-viewer__viewport--zoom {
position: absolute;
bottom: 5px;
right: 5px;
color: #fff;
z-index: 3;
font-size: 12px;
pointer-events: none;
}
.media-360-viewer__viewport--square {
border: 1px solid black;
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
box-shadow: rgba(0, 0, 0, 0.5) 0 0 0 10000px;
cursor: grab;
transition: background ease-in-out 0.1s;
}
.media-360-viewer__viewport--square:hover {
background: rgba(255, 255, 255, 0.2);
}
.media-360-viewer__header {
position: absolute;
top: 10px;
left: 0;
width: 100%;
}
.media-360-viewer__tools {
position: absolute;
bottom: 0;
left: 0;
width: 100%;
display: flex;
align-items: center;
justify-content: center;
padding-bottom: 10px;
}
.media-360-viewer__tools>a {
margin: 0 5px;
color: #000;
background: #fff;
border-radius: 50%;
width: 40px;
text-align: center;
line-height: 40px;
}
.media-360-viewer__tools>a[disabled] {
opacity: .5;
cursor: not-allowed;
}
.media-360-viewer__tools>a[disabled]:hover {
color: #000;
background: #fff;
}
.media-360-viewer__tools>a:hover {
background: #000;
color: #fff;
}
.media-360-viewer__tools--autoplay:before {
font-family: 'ClickIcons';
content: '\ea81';
}
.media-360-viewer__tools--autoplay.active:before {
content: '\eb48';
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<test></test>
</div>
<script type="text/x-template" id="template">
<div class="media-360-viewer" ref="container">
<transition name="fade">
<div class="media-360-viewer__viewport" v-if="zoomLevel > 1 && viewportEnabled" :style="{ width: (viewportScale * 100) + '%' }">
<img tabindex="1" draggable="false" alt="Viewport" class="media-360-viewer__viewport--image" src="https://www.bennetts.co.uk/-/media/bikesocial/2019-september-images/2020-yamaha-yzf-r1-and-r1m-review/2020-yamaha-r1-and-r1m_005.ashx?h=493&w=740&la=en&hash=F97CD240F0DDFA9540E912DCF7F07019017035C6">
<span class="media-360-viewer__viewport--zoom">
x{{ Math.round(zoomLevel * 10) / 10 }}
</span>
<span :style="{ transform: viewportTransform }" @mouseup="handleEnd" @mousedown="handleStart" @mousemove="handleMove($event, true)" @touchstart="handleStart" @touchend="handleEnd" @touchmove="handleMove($event, true)" class="media-360-viewer__viewport--square"></span>
</div>
</transition>
<img tabindex="1" ref="image" draggable="false" src="https://www.bennetts.co.uk/-/media/bikesocial/2019-september-images/2020-yamaha-yzf-r1-and-r1m-review/2020-yamaha-r1-and-r1m_005.ashx?h=493&w=740&la=en&hash=F97CD240F0DDFA9540E912DCF7F07019017035C6" :style="{ transform: transform }" :class="{
canTranslate: zoomLevel > 1 && zoomEnabled,
canRotate: zoomLevel === 1,
isTranslating: zoomLevel > 1 && zoomEnabled && isMoving
}" @mouseup="handleEnd" @mousedown="handleStart" @mousemove="handleMove" @touchstart="handleStart" @touchend="handleEnd" @touchmove="handleMove" @dblclick="zoom" @wheel="zoomWheel" alt="360 Image" />
</div>
</script>
Vue.component('test', {
template: '#template',
data: function() {
return {
loading: true,
loop: true,
speed: 8,
speedController: 0,
zoomEnabled: true,
zoomLevels: [1, 1.5, 2, 2.5, 3],
zoomLevel: 1,
frame: 1,
images: [],
imagesPreloaded: 0,
reverse: false,
viewportScale: 0.3,
viewportEnabled: true,
viewportOpacity: 0.8,
lastX: 0,
lastY: 0,
startX: 0,
startY: 0,
translateX: 0,
translateY: 0,
isMoving: false,
isDragging: false,
};
},
mounted() {
window.addEventListener('mouseup', this.handleEnd);
window.addEventListener('touchend', this.handleEnd);
},
beforeDestroy() {
window.removeEventListener('mouseup', this.handleEnd);
window.removeEventListener('touchend', this.handleEnd);
},
methods: {
zoom(direction) {
// todo: Load high res image based on zoom level
const closest = this.zoomLevels.reduce((a, b) => {
return Math.abs(b - this.zoomLevel) < Math.abs(a - this.zoomLevel) ? b : a;
});
if (this.zoomLevels[this.zoomLevels.indexOf(closest) + direction] === undefined) {
return;
}
let current = this.zoomLevels.indexOf(closest);
let index = current += direction;
if (direction === 0) {
index = 0;
}
this.zoomLevel = this.zoomLevels[index];
this.translate(null, this.$refs.image, true);
},
zoomWheel($event) {
$event.preventDefault();
this.zoomLevel += $event.deltaY * -0.01;
if (this.zoomLevel < 1) {
this.zoomLevel = 1;
}
let maxZoom = this.zoomLevels[this.zoomLevels.length - 1];
this.zoomLevel = Math.min(Math.max(.125, this.zoomLevel), maxZoom);
this.translate(null, this.$refs.image, true);
},
handleStart($event) {
$event.preventDefault();
if ($event.button && $event.button !== 0) {
return;
}
this.isMoving = true;
this.isDragging = true;
this.startX = $event.pageX || $event.touches[0].pageX;
this.startY = $event.pageY || $event.touches[0].pageY;
},
handleMove($event, viewport) {
if ($event.button && $event.button !== 0) {
return;
}
if (this.isMoving && this.isDragging) {
const positions = {
x: $event.pageX || $event.touches[0].pageX,
y: $event.pageY || $event.touches[0].pageY
}
if (this.zoomLevel !== 1) {
this.translate(positions, $event.target, null, viewport);
}
}
},
handleEnd($event) {
if ($event.button && $event.button !== 0) {
return;
}
this.isMoving = false;
},
translate(positions, element, zooming, viewport) {
window.requestAnimationFrame(() => {
positions = positions || {
x: this.startX,
y: this.startY
};
if (viewport) {
this._translateFromViewport(positions, element);
} else {
this._translateFromImage(positions, element, zooming);
}
this.startX = positions.x;
this.startY = positions.y;
});
},
_translateFromViewport: function(positions, element) {
let move = {
x: positions.x - this.startX,
y: positions.y - this.startY
};
let box = element.getBoundingClientRect();
let container = element.parentNode.getBoundingClientRect();
let translate = {
left: (container.left - box.left) - ((move.x * this.viewportScale) * this.zoomLevel),
right: (container.right - box.right) - ((move.x * this.viewportScale) * this.zoomLevel),
top: (container.top - box.top) - ((move.y * this.viewportScale) * this.zoomLevel),
bottom: (container.bottom - box.bottom) - ((move.y * this.viewportScale) * this.zoomLevel)
};
if (translate.left <= 0 && translate.right >= 0) {
this.translateX -= move.x / this.viewportScale;
}
if (translate.top <= 0 && translate.bottom >= 0) {
this.translateY -= move.y / this.viewportScale
}
},
_translateFromImage: function(positions, element, zooming) {
let move = {
x: Math.floor(positions.x - this.startX),
y: Math.floor(positions.y - this.startY)
};
let image = element.getBoundingClientRect();
let container = element.parentNode.getBoundingClientRect();
let translate = {
left: (container.left - image.left) - (move.x * this.zoomLevel),
right: (container.right - image.right) - (move.x * this.zoomLevel),
top: (container.top - image.top) - (move.y * this.zoomLevel),
bottom: (container.bottom - image.bottom) - (move.y * this.zoomLevel)
};
if (zooming) {
if (translate.left <= 0) {
this.translateX += translate.left;
}
if (translate.right >= 0) {
this.translateX += translate.right;
}
if (translate.top <= 0) {
this.translateY += translate.top;
}
if (translate.bottom >= 0) {
this.translateY += translate.bottom;
}
}
if (translate.left >= 0 && translate.right <= 0) {
this.translateX += move.x / this.zoomLevel;
}
if (translate.top >= 0 && translate.bottom <= 0) {
this.translateY += move.y / this.zoomLevel;
}
},
},
computed: {
preloadProgress: function() {
return Math.floor(this.imagesPreloaded / this.images.length * 100);
},
currentPath: function() {
return this.images[this.frame - 1];
},
nextZoomLevel: function() {
const closest = this.zoomLevels.reduce((a, b) => {
return Math.abs(b - this.zoomLevel) < Math.abs(a - this.zoomLevel) ? b : a;
});
if (this.zoomLevels.indexOf(closest) === this.zoomLevels.length - 1) {
return this.zoomLevels[0];
}
return this.zoomLevels[this.zoomLevels.indexOf(closest) + 1];
},
viewportTransform: function() {
if (this.viewportEnabled) {
let translateX = -((this.translateX * this.viewportScale) * this.zoomLevel);
let translateY = -((this.translateY * this.viewportScale) * this.zoomLevel);
return `scale(${1 / this.zoomLevel}) translateX(${translateX}px) translateY(${translateY}px)`;
}
},
transform: function() {
return `scale(${this.zoomLevel}) translateX(${this.translateX}px) translateY(${this.translateY}px)`;
},
canZoomIn: function() {
const closest = this.zoomLevels.reduce((a, b) => {
return Math.abs(b - this.zoomLevel) < Math.abs(a - this.zoomLevel) ? b : a;
});
return this.zoomLevels[this.zoomLevels.indexOf(closest) + 1] === undefined
},
canZoomOut: function() {
const closest = this.zoomLevels.reduce((a, b) => {
return Math.abs(b - this.zoomLevel) < Math.abs(a - this.zoomLevel) ? b : a;
});
return this.zoomLevels[this.zoomLevels.indexOf(closest) + -1] === undefined
}
}
});
window.vue = new Vue({
el: '#app'
});
.media-360-viewer {
position: relative;
overflow: hidden;
background: #000;
width: 500px;
}
.media-360-viewer__image {
width: 100%;
}
.media-360-viewer__image.canTranslate {
cursor: grab;
}
.media-360-viewer__image.isTranslating {
cursor: grabbing;
}
.media-360-viewer__image.canRotate {
cursor: w-resize;
}
.media-360-viewer__loader {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.5);
}
.media-360-viewer__loader * {
user-select: none;
}
.media-360-viewer__loader > svg {
width: 100%;
height: 100%;
transform: rotate(270deg);
}
.media-360-viewer__loader--text {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
display: flex;
justify-content: center;
align-items: center;
flex-direction: column;
}
.media-360-viewer__loader--text p {
font-size: 100%;
font-weight: bold;
color: #fff;
}
.media-360-viewer__loader--text p.large {
font-size: 150%;
}
.media-360-viewer__loader--background {
stroke-dasharray: 0;
stroke-dashoffset: 0;
stroke: rgba(0, 0, 0, 0.7);
stroke-width: 25px;
}
.media-360-viewer__loader--cover {
stroke-dasharray: 200%;
stroke: #848484;
stroke-width: 15px;
stroke-linecap: round;
}
.media-360-viewer__loader--background,
.media-360-viewer__loader--cover {
fill: transparent;
}
.media-360-viewer__viewport {
position: absolute;
top: 10px;
left: 10px;
z-index: 2;
overflow: hidden;
}
.media-360-viewer__viewport--image {
width: 100%;
pointer-events: none;
}
.media-360-viewer__viewport--zoom {
position: absolute;
bottom: 5px;
right: 5px;
color: #fff;
z-index: 3;
font-size: 12px;
pointer-events: none;
}
.media-360-viewer__viewport--square {
display: block;
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
box-shadow: rgba(0, 0, 0, 0.8) 0 0 0 10000px;
cursor: grab;
transition: background ease-in-out 0.1s;
}
.media-360-viewer__viewport--square:hover {
background: rgba(255, 255, 255, 0.2);
}
.media-360-viewer__tools {
position: absolute;
bottom: 0;
left: 0;
width: 100%;
display: flex;
align-items: center;
justify-content: center;
padding-bottom: 10px;
}
.media-360-viewer__tools > a {
margin: 0 5px;
color: #000;
background: #fff;
border-radius: 50%;
width: 40px;
text-align: center;
line-height: 40px;
}
.media-360-viewer__tools > a[disabled] {
opacity: .5;
cursor: not-allowed;
}
.media-360-viewer__tools > a[disabled]:hover {
color: #000;
background: #fff;
}
.media-360-viewer__tools > a:hover {
background: #000;
color: #fff;
}
.media-360-viewer__tools--autoplay:before {
font-family: 'ClickIcons';
content: '\ea81';
}
.media-360-viewer__tools--autoplay.active:before {
content: '\eb48';
}
.fade-enter-active,
.fade-leave-active {
transition: opacity .5s;
}
.fade-enter,
.fade-leave-to {
opacity: 0;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<test></test>
</div>
<script type="text/x-template" id="template">
<div class="media-360-viewer" ref="container">
<transition name="fade">
<div class="media-360-viewer__viewport" v-if="zoomLevel > 1 && viewportEnabled" :style="{ width: (viewportScale * 100) + '%' }">
<img tabindex="1" draggable="false" alt="Viewport" class="media-360-viewer__viewport--image" src="https://www.bennetts.co.uk/-/media/bikesocial/2019-september-images/2020-yamaha-yzf-r1-and-r1m-review/2020-yamaha-r1-and-r1m_005.ashx?h=493&w=740&la=en&hash=F97CD240F0DDFA9540E912DCF7F07019017035C6">
<span class="media-360-viewer__viewport--zoom">
x{{ Math.round(zoomLevel * 10) / 10 }}
</span>
<span :style="{ transform: viewportTransform }" @mouseup="handleEnd" @mousedown="handleStart" @mousemove="handleMove($event, true)" @touchstart="handleStart" @touchend="handleEnd" @touchmove="handleMove($event, true)" class="media-360-viewer__viewport--square"></span>
</div>
</transition>
<img tabindex="1" ref="image" draggable="false" src="https://www.bennetts.co.uk/-/media/bikesocial/2019-september-images/2020-yamaha-yzf-r1-and-r1m-review/2020-yamaha-r1-and-r1m_005.ashx?h=493&w=740&la=en&hash=F97CD240F0DDFA9540E912DCF7F07019017035C6"
:style="{ transform: transform }" :class="{
canTranslate: zoomLevel > 1 && zoomEnabled,
canRotate: zoomLevel === 1,
isTranslating: zoomLevel > 1 && zoomEnabled && isMoving
}" @mouseup="handleEnd" @mousedown="handleStart" @mousemove="handleMove" @touchstart="handleStart" @touchend="handleEnd" @touchmove="handleMove" @dblclick="zoom" @wheel="zoomWheel" alt="360 Image" />
</div>
</script>
最佳答案
Math.floor 仅在必要时
这个问题的一部分是调用 Math.floor
的结果。每时每刻。每次调用Math.floor
您的下一个计算将不太准确。
如果您仍想对数字进行四舍五入,请仅在计算链的末尾或什至在您使用变量的地方进行。例如:
transform: function() {
const translateX = Math.floor(this.translateX)
const translateY = Math.floor(this.translateY)
return `scale(${this.zoomLevel}) translateX(${translateX}px) translateY(${translateY}px)`;
}
比例因子
However when moving the image around it is moving faster than the mouse
zoomLevel
确定像这样:
if (translate.left >= 0 && translate.right <= 0) {
this.translateX += move.x / this.zoomLevel
}
if (translate.top >= 0 && translate.bottom <= 0) {
this.translateY += move.y / this.zoomLevel
}
缩放因子 - 视口(viewport)
zoomLevel
但是存储在
this.viewportScale
中的视口(viewport)的比例.因此,将两个解决方案合并在一起,我们现在有如下代码:
if (translate.left >= 0 && translate.right <= 0) {
if (viewport) {
this.translateX += move.x / this.viewportScale
} else {
this.translateX += move.x / this.zoomLevel
}
}
if (translate.top >= 0 && translate.bottom <= 0) {
if (viewport) {
this.translateY += move.y / this.viewportScale
} else {
this.translateY += move.y / this.zoomLevel
}
}
反转值
I also feel like when i'm clicking and dragging on the viewport I shouldn't be reversing the values twice
if
.你的函数可能像这样:
translate (positions, element, zooming, viewport) {
positions = positions || {
x: this.startX,
y: this.startY
}
if (viewport) {
this._translateFromViewport(positions, element, zooming)
} else {
this._translateFromImage(positions, element, zooming)
}
this.startX = positions.x
this.startY = positions.y
}
在哪里
_translateFromViewport
和
_translateFromImage
函数保存功能特定的代码。
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