【发布时间】：2019-04-30 03:16:00
【问题描述】：
背景：
我们正在容器内显示两个面具....
用户点击两个面具并上传图片....
现在编辑两幅图像上都显示文本......
一旦用户点击编辑文本，我们就会显示弹出框......
我们可以看到 Zoomin 和 Zoomout 按钮正在显示....
重现问题的步骤：
1.点击Zoomin第一张图片5次....
2.现在点击放大第二张图片....
第一张图片的缩放值现在等于与第二张图片....
但是如果我们缩放一张图片，它不应该改变另一张图片的缩放值....
这里是16 seconds Video to show the issue
要求：
我可以通过为每个图像使用多个变量来静态解决问题....
但我需要动态解决方案，因为我只为zoom_in 和zoom_out 使用了一个变量，称为scale....
这里是Codepen
以下是片段：
var target;
const imageUrl = "https://i.imgur.com/RzEm1WK.png";
let jsonData = {
"layers": [{
"x": 0,
"height": 612,
"layers": [{
"x": 160,
"src": "ax0HVTs.png",
"y": 291,
"height": 296,
"width": 429,
"name": "mask_1"
},
{
"x": 25,
"src": "hEM2kEP.png",
"height": 324,
"width": 471,
"y": 22,
"name": "mask_2"
}
],
"y": 0,
"width": 612
}]
};
const containerElement = $('#container');
const fileUp = $('#fileup');
$(function() {
// Upload image onclick mask image
containerElement.click(function(e) {
var res = e.target;
target = res.id;
// console.log(target);
if (e.target.getContext) {
// click only inside Non Transparent part
var pixel = e.target.getContext('2d').getImageData(e.offsetX, e.offsetY, 1, 1).data;
if (pixel[3] === 255) {
setTimeout(() => {
$('#fileup').click();
}, 20);
}
}
});
// Fetch mask images from json file - IGNORE this code
function getAllSrc(layers) {
let arr = [];
layers.forEach(layer => {
if (layer.src) {
arr.push({
src: layer.src,
x: layer.x,
y: layer.y,
height: layer.height,
width: layer.width,
name: layer.name
});
} else if (layer.layers) {
let newArr = getAllSrc(layer.layers);
if (newArr.length > 0) {
newArr.forEach(({
src,
x,
y,
height,
width,
name
}) => {
arr.push({
src,
x: (layer.x + x),
y: (layer.y + y),
height,
width,
name: (name)
});
});
}
}
});
return arr;
}
function json(data)
{
var width = 0;
var height = 0;
let arr = getAllSrc(data.layers);
let layer1 = data.layers;
width = layer1[0].width;
height = layer1[0].height;
let counter = 0;
let table = [];
// container dimensions
containerElement.css('width', width + "px").css('height', height + "px").addClass('temp');
//end
for (let {
src,
x,
y,
name
} of arr) {
//Get Height and width of mask image [ edit button ]
var ImagePosition = arr;
//code end
var mask = $(".container").mask({
imageUrl: imageUrl,
// Fetch Mask images
maskImageUrl: 'https://i.imgur.com/' + src,
// end
onMaskImageCreate: function(img) {
// Mask image positions
img.css({
"position": "absolute",
"left": x + "px",
"top": y + "px"
});
// end
},
id: counter
});
table.push(mask);
fileup.onchange = function() {
let mask2 = table[target];
const imgView = URL.createObjectURL(fileup.files[0]);
const newImageLoadedId = mask2.loadImage(URL.createObjectURL(fileup.files[0]));
document.getElementById('fileup').value = "";
if (($(".masked-img" + newImageLoadedId + ' #renderImage').length) === 0) {
$('.masked-img' + newImageLoadedId).append("<img id='renderImage' style='width: 300px' src=" + imgView + ">");
} else {
$('#renderImage').attr('src', imgView);
}
// Edit image - IGNORE this code
if ($(".masked-img" + newImageLoadedId).length === 1) {
$("<span class=\"pip pip" + newImageLoadedId + "\">" +
"<a onclick='document.getElementById(\"dark" + newImageLoadedId + "\").style.display=\"block\";'><span class=\"edit edit" + newImageLoadedId + "\" >Edit </span></a>" +
"</span>").insertAfter(".masked-img" + newImageLoadedId).css({
"left": ImagePosition[newImageLoadedId].x + (ImagePosition[newImageLoadedId].width / 2) + "px",
"top": ImagePosition[newImageLoadedId].y + (ImagePosition[newImageLoadedId].height / 2) + "px"
});;
$("<div id=\'dark" + newImageLoadedId + "\' class=\'dark_content\'>" +
$('#demoTemplate').html() +
"<a href=\"javascript:void(0)\" onclick=\"document.getElementById(\'dark" + newImageLoadedId + "\').style.display=\'none\'\">Close</a>" + "</div>").appendTo(".pip" + newImageLoadedId).css({
"left": $('.edit' + newImageLoadedId).width() + 2 + "px",
"top": "0px"
});
}
// end
};
counter++;
}
}
json(jsonData);
}); // end of function
// Image code
(function($) {
var JQmasks = [];
$.fn.mask = function(options) {
// This is the easiest way to have default options.
var settings = $.extend({
// These are the defaults.
maskImageUrl: undefined,
imageUrl: undefined,
scale: 1,
id: new Date().getUTCMilliseconds().toString(),
x: 0, // image start position
y: 0, // image start position
onMaskImageCreate: function(div) {},
}, options);
var container = $(this);
let prevX = 0,
prevY = 0,
draggable = false,
img,
canvas,
context,
image,
timeout,
initImage = false,
startX = settings.x,
startY = settings.y,
div;
container.mousePosition = function(event) {
return {
x: event.pageX || event.offsetX,
y: event.pageY || event.offsetY
};
};
container.selected = function(ev) {
var pos = container.mousePosition(ev);
var item = $(".masked-img canvas").filter(function() {
var offset = $(this).offset()
var x = pos.x - offset.left;
var y = pos.y - offset.top;
var d = this.getContext('2d').getImageData(x, y, 1, 1).data;
return d[0] > 0
});
JQmasks.forEach(function(el) {
var id = item.length > 0 ? $(item).attr("id") : "";
if (el.id == id)
el.item.enable();
else el.item.disable();
});
};
container.enable = function() {
draggable = true;
$(canvas).attr("active", "true");
div.css({
"z-index": 2
});
};
container.disable = function() {
draggable = false;
$(canvas).attr("active", "false");
div.css({
"z-index": 1
});
};
container.getImagePosition = function() {
return {
x: settings.x,
y: settings.y,
scale: settings.scale
};
};
container.updateStyle = function() {
return new Promise((resolve, reject) => {
context.beginPath();
context.globalCompositeOperation = "source-over";
image = new Image();
image.setAttribute('crossOrigin', 'anonymous');
image.src = settings.maskImageUrl;
// console.log(image.src);
image.onload = function() {
canvas.width = image.width;
canvas.height = image.height;
context.drawImage(image, 0, 0, image.width, image.height);
div.css({
"width": image.width,
"height": image.height
});
resolve();
};
});
};
function renderInnerImage() {
// img = $('#renderImage'); // new Image()
img = new Image();
img.setAttribute('crossOrigin', 'anonymous');
img.src = settings.imageUrl;
// console.log(image.src);
img.onload = function() {
settings.x = settings.x === 0 && initImage ? (canvas.width - (img.width * settings.scale)) / 2 : settings.x;
settings.y = settings.y === 0 && initImage ? (canvas.height - (img.height * settings.scale)) / 2 : settings.y;
context.globalCompositeOperation = 'source-atop';
context.drawImage(img, settings.x, settings.y, img.width * settings.scale, img.height * settings.scale);
initImage = false;
};
}
// change the draggable image
container.loadImage = function(imageUrl) {
console.log("load");
settings.y = startY;
settings.x = startX;
// console.log(settings.y);
// console.log(settings.x);
prevX = prevY = 0;
settings.imageUrl = imageUrl;
// console.log(settings.imageUrl);
initImage = true;
container.updateStyle().then(renderInnerImage);
// sirpepole Add this
return settings.id;
};
container.loadMaskImage = function(imageUrl, from) {
canvas = document.createElement("canvas");
context = canvas.getContext('2d');
canvas.setAttribute("draggable", "true");
canvas.setAttribute("id", settings.id);
settings.maskImageUrl = imageUrl;
div = $("<div/>", {
"class": "masked-img"
}).append(canvas);
// div.find("canvas").on('touchstart mousedown', function(event)
div.find("canvas").on('dragstart', function(event) {
if (event.handled === false) return;
event.handled = true;
container.onDragStart(event);
});
div.find("canvas").on('touchend mouseup', function(event) {
if (event.handled === false) return;
event.handled = true;
container.selected(event);
});
div.find("canvas").bind("dragover", container.onDragOver);
container.append(div);
if (settings.onMaskImageCreate)
settings.onMaskImageCreate(div);
container.loadImage(settings.imageUrl);
};
container.loadMaskImage(settings.maskImageUrl);
JQmasks.push({
item: container,
id: settings.id
});
// Edit image
div.addClass('masked-img' + settings.id);
// end
return container;
};
}(jQuery));
// zoom
var angle = 0;
var scale = 1;
function zoom_in(data) {
var getParent = data.parentElement.parentElement.parentElement;
var getId = getParent.id.substring(getParent.id.length - 1);
console.log(getId);
scale += .25;
$('.masked-img' + getId + ' #renderImage').css({
transform: 'scale('+ scale +')'
});
}
function zoom_out(data) {
var getParent = data.parentElement.parentElement.parentElement;
var getId = getParent.id.substring(getParent.id.length - 1);
console.log(getId);
scale -= .25;
$('.masked-img' + getId + ' #renderImage').css({
transform: 'scale('+ scale +')'
});
}.container {
background: silver;
position: relative;
}
.container img {
position: absolute;
top: 0;
bottom: 250px;
left: 0;
right: 0;
margin: auto;
z-index: 999;
}
.masked-img {
overflow: hidden;
position: relative;
}
.pip {
display: inline-block;
margin: 0;
position: absolute;
}
.edit {
display: block;
background: #444;
border: 1px solid black;
color: white;
text-align: center;
cursor: pointer;
position: absolute;
z-index: 3;
}
.edit:hover {
background: white;
color: black;
position: absolute;
z-index: 3;
}
.dark_content {
display: none;
position: relative;
top: 25%;
left: 25%;
width: 250px;
height: 250px;
padding: 16px;
border: 16px solid orange;
background-color: white;
z-index: 1002;
overflow: auto;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<input id="fileup" name="fileup" type="file" style="display:none" >
<div id="container"class="container">
</div>
<template id='demoTemplate'>
<span>
<div class="btn-group">
<button type="button" class="js-zoom-in" onclick="zoom_in(this)">Zoom In</button>
<button type="button" class="js-zoom-out" onclick="zoom_out(this)">Zoom Out</button>
</div>
<img id="image" src ="" style ="display:none">
</span>
</template>【问题讨论】：
标签： javascript jquery html zooming