缩放用户上传的图像 onclick 按钮
Posted
技术标签:
【中文标题】缩放用户上传的图像 onclick 按钮【英文标题】：Zoom the user uploaded image onclick button 【发布时间】：2019-09-03 06:49:06 【问题描述】：这是放大和缩小的基本代码：https://codepen.io/kidsdial/pen/ROBpgM，
现在我尝试将该代码集成到我的项目中。
背景：
用户点击面具并在面具上上传自己的图片。
图像上传后，编辑文本会显示在图像上。
一旦用户点击Edit文本，我们将显示弹出框。
显示放大和缩小按钮。
问题：
当我们单击该按钮时，用户上传的图像不会发生缩放。
Video link
代码笔：https://codepen.io/kidsdial/pen/PgxegO
小提琴：https://jsfiddle.net/kidsdial1/nhswfjr3/
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 = $(".container").mask(
imageUrl: imageUrl,
// Fetch Mask images
maskImageUrl: 'https://i.imgur.com/' + src,
// end
onMaskImageCreate: function(img)
// Mask image positions
img.css(
"position": "absolute",
"left": x + "px",
"top": y + "px"
);
// end
,
id: counter
);
table.push(mask);
fileup.onchange = function()
let mask2 = table[target];
const newImageLoadedId = mask2.loadImage(URL.createObjectURL(fileup.files[0]));
document.getElementById('fileup').value = "";
// Edit image - IGNORE this code
if ($(".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;
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 = new Image();
img.setAttribute('crossOrigin', 'anonymous');
img.src = settings.imageUrl;
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;
prevX = prevY = 0;
settings.imageUrl = 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
//document.getElementById("img").src = json(data);
var angle = 0;
var scale = 1;
var $img = $('#image');
$img.on('transform', function()
$img.css('transform', `rotate($angledeg) scale($scale)`);
);
$('.js-zoom-in').on('click', function()
scale += 0.25;
if (scale == 2.25)
scale = 2;
;
$img.trigger('transform');
);
$('.js-zoom-out').on('click', function()
scale -= 0.25;
if (scale == 0)
scale = 0.25;
$img.trigger('transform');
);.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">Zoom In</button>
<button type="button" class="js-zoom-out">Zoom Out</button>
</div>
<img id="image" src ="" style ="display:none">
</span>
</template>注意：如果有人给我一个解决方案，我会给150赏金。
【问题讨论】：
难以重现将您的代码作为错误"message": "Uncaught ReferenceError: json is not defined",
@MarkSchultheiss 感谢您的评论，实际上我不知道如何解决该错误，因为我做的一切都正确.....请您检查代码并给我一个解决该控制台错误的想法。 .....
你应该使用 data.json() 而不是 json(data)
Ans 这就是你得到这个的原因
@AdeshKumar 我得到了Uncaught ReferenceError: data is not defined
【参考方案1】：
您有一些范围问题，还有其他一些问题。我试着在我去的时候发表评论。我还修复了缺少分号和多余分号的问题。
我创建了一个全局对象myApp. 来保存这些东西而不是大量的全局变量。
可用性：“+”要求上传内容，但（对我而言）不清楚什么是正确的，用户可能也会注意到 - 但那是意见而不是事实。我没有看到那些“编辑”或类似的东西，所以您的缩放可能包含在丢失的代码中？我不知道那里。
现在的问题：放大图像 - 您的“上传”正在流血，您在画布上有重复的 id。我不太了解您正在尝试做些什么来改善这一点。
var myApp = myApp || ;
myApp.target = ;
myApp.imageUrl = "https://i.imgur.com/RzEm1WK.png";
myApp.jsonData =
"layers": [
"x": 0,
"height": 612,
"layers": [
"x": 160,
"layers": [
"x": 0,
"src": "ax0HVTs.png",
"y": 0,
"height": 296,
"width": 429,
"name": "L2b-1"
],
"y": 291,
"name": "user_image_1"
,
"x": 25,
"layers": [
"x": 0,
"src": "hEM2kEP.png",
"height": 324,
"width": 471,
"y": 0,
"name": "L2C-1"
],
"y": 22,
"name": "L2"
],
"y": 0,
"width": 612,
"name": "L1"
]
;
// Below code will fetch mask images from json file
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 = [];
for (let
src,
x,
y,
name
of arr)
let csize =
'width': width + "px",
'height': height + "px"
;
$(".container")
.css(csize)
.addClass('temp');
//Get Height and width of mask image [ edit button ]
var ImagePosition = arr;
//code end
var mask = $(".container").mask(
imageUrl: myApp.imageUrl,
// where is src defined?
maskImageUrl: 'https://i.imgur.com/' + src,
onMaskImageCreate: function(img)
// Mask image positions
img.css(
"position": "absolute",
"left": x + "px",
"top": y + "px"
);
// code end
,
id: counter
);
table.push(mask);
fileup.onchange = function()
let mask2 = table[myApp.target];
const newImageLoadedId = mask2.loadImage(URL.createObjectURL(fileup.files[0]));
document.getElementById('fileup').value = "";
// Edit image
let mskimg = $(".masked-img" + newImageLoadedId);
if (mskimg.length === 1)
let mySpan = $("<span class='pip'></span>");
mySpan.addClass("pip" + newImageLoadedId);
let darkId = "dark" + newImageLoadedId;
let myA = $("<a onclick='document.getElementById('" + darkId + "').style.display=\"block\";'></a>");
let linkSpan = $("<span class='edit'>Edit</span>")
.addClass("edit" + newImageLoadedId);
myA.append(linkSpan);
mySpan.append(myA)
.insertAfter(mskimg)
.css(
"left": ImagePosition[newImageLoadedId].x + (ImagePosition[newImageLoadedId].width / 2) + "px",
"top": ImagePosition[newImageLoadedId].y + (ImagePosition[newImageLoadedId].height / 2) + "px"
);
$("<div id='" + darkId + "' class='dark_content'></div>").append($('#demoTemplate').html() +
"<a href='javascript:void(0)' onclick=\"document.getElementById('" + darkId + "').style.display='none'\">Close</a>")
.appendTo(".pip" + newImageLoadedId)
.css(
"left": $('.edit' + newImageLoadedId).width() + 2 + "px",
"top": "0px"
);
// Edit code end here....
;
counter++;
$(function()
// below code will upload image onclick mask image
$('.container').click(function(e)
var res = e.target;
myApp.target = res.id;
console.log("target:", myApp.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(() =>
$('#fileup').click();
, 20);
);
json(myApp.jsonData);
); // end of document ready
// jq plugin
(function($)
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;
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 = new Image();
img.setAttribute('crossOrigin', 'anonymous');
img.src = settings.imageUrl;
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");
//if (img)
// img.remove();
// reset the code.
settings.y = startY;
settings.x = startX;
prevX = prevY = 0;
settings.imageUrl = imageUrl;
initImage = true;
container.updateStyle().then(renderInnerImage);
// sirpepole Add this
return settings.id;
;
// change the masked Image
container.loadMaskImage = function(imageUrl, from)
canvas = document.createElement("canvas");
context = canvas.getContext('2d');
canvas.setAttribute("draggable", "true");
// invalid to have same id
let cvl = $('canvas').length;
console.log("cvl:",cvl,"sid:",settings.id);
canvas.setAttribute("id", settings.id);
settings.maskImageUrl = imageUrl;
div = $("<div/>",
"class": "masked-img"
).append(canvas);
// div.find("canvas").on('touchstart mousedown', function(event)
div.find("canvas").on('dragstart', function(event)
if (event.handled === false) return;
event.handled = true;
container.onDragStart(event);
);
div.find("canvas").on('touchend mouseup', function(event)
if (event.handled === false) return;
event.handled = true;
container.selected(event);
);
div.find("canvas").bind("dragover", container.onDragOver);
container.append(div);
if (settings.onMaskImageCreate)
settings.onMaskImageCreate(div);
container.loadImage(settings.imageUrl);
;
container.loadMaskImage(settings.maskImageUrl);
JQmasks.push(
item: container,
id: settings.id
);
// Edit image
div.addClass('masked-img' + settings.id);
// code end
return container;
;
(jQuery));
//Zoom in , Zoom out , Rotate code
// assume change data to myApp.jsonData
// in the template so, it does not find it? wrong ID? terrible id
//document.getElementById("img").src = json(data);
//document.getElementById("template-image").src = json(myApp.jsonData);
// probably should namespace these
myApp.angle = 0;
myApp.scale = 1;
myApp.$img = $('.template-image').eq(0);
// moved from above, use the revised id (class)
myApp.$img.prop("src", json(myApp.jsonData));
myApp.$img.on('transform', function()
$(this).css('transform', `rotate($myApp.angledeg) scale($myApp.scale)`);
);
$('.js-rotate-right').on('click', function()
myApp.angle += 15;
myApp.$img.trigger('transform');
);
$('.js-rotate-left').on('click', function()
myApp.angle -= 15;
myApp.$img.trigger('transform');
);
$('.js-zoom-in').on('click', function()
myApp.scale += 0.25;
if (myApp.scale == 2.25)
myApp.scale = 2;
myApp.$img.trigger('transform');
);
$('.js-zoom-out').on('click', function()
myApp.scale -= 0.25;
if (myApp.scale == 0)
myApp.scale = 0.25;
myApp.$img.trigger('transform');
);.container
background: gold;
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: 350px;
height: 350px;
padding: 16px;
border: 16px solid orange;
background-color: white;
z-index: 1002;
overflow: auto;
.js-zoom-out,.js-zoom-inborder: solid lime 1px;<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 class="container">
</div>
<template id='demoTemplate'>
<span>
<span class="btn-group">
<button type="button" class="js-zoom-in">Zoom In</button>
<button type="button" class="js-zoom-out">Zoom Out</button>
<button type="button" class="js-rotate-right">Rotate Right</button>
<button type="button" class="js-rotate-left">Rotate Left</button>
</span>
<img class="template-image" src ="" style ="display:none"> </span>
</template>【讨论】：
您好，我在运行您的 sn-p 时看到控制台错误，请查看。你这边....我正在通过手机查看.... 坦率地说，您的插件不是以标准方式编写的。例如，它使用了像$(".masked-img canvas") 这样的“假定”对象，并且可能需要在此处进行一些工作以使其不会渗入全局命名空间并正确支持每个“掩码”对象的实例。您的代码感觉与一些交叉依赖问题一起修补，部分原因是使用了一些全局变量来解决插件挑战。如果我有时间，我可能会考虑修复它，但这不是一件容易的事。
对不起，我用了这个插件：github.com/AlenToma/Canvas-Mask，请有空的时候帮我看看，谢谢.....
我会将这个“上传和缩放”与其余代码（取出插件等）分开，然后制作一个最小的代码集，用于上传/缩放，然后将其纳入您在这里的解决方案中。我什至可能会建议尝试一下，并将其作为最简单的示例作为新问题发布在这里，而不涉及此插件。【参考方案2】：
试试这个代码。 @PranavNutalapati 帮我解决了这个问题。
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');
let mask;
$(function ()
// Upload image on the click mask image
containerElement.click(function (e)
var res = e.target;
target = res.id;
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 = $(".container").mask(
imageUrl: imageUrl,
// Fetch Mask images
maskImageUrl: 'http://i.imgur.com/' + src,
// end
onMaskImageCreate: function (img)
// Mask image positions
img.css(
"position": "absolute",
"left": x + "px",
"top": y + "px"
);
// end
,
id: counter
);
// here
table.push(mask);
fileup.onchange = function ()
let mask2 = table[target];
const newImageLoadedId = mask2.loadImage(URL.createObjectURL(fileup.files[0]));
document.getElementById('fileup').value = "";
// Edit image - IGNORE this code
if ($(".masked-img" + newImageLoadedId).length === 1)
const span = $("<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"
);
span.attr('data-id', newImageLoadedId)
$("<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": $('.edit' + newImageLoadedId).width() + 2 + "px",
"top": "0px"
);
// end
;
counter++;
return mask;
mask = json(jsonData);
); // end of function
// Image code
(function ($)
window.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) ,
rotate: 0,
, options);
// Create the image properties
settings.maskImage = new Image
settings.image = new Image
// set the cross-origin attributes
settings.maskImage.setAttribute('crossOrigin', 'anonymous');
settings.image.setAttribute('crossOrigin', 'anonymous');
settings.maskImage.onload = function ()
// once the mask is loaded, load the image
container.loadImage(settings.imageUrl)
settings.image.onload = function ()
// once the image is loaded, render to canvas
container.drawMask()
container.drawImage()
var container = $(this);
let prevX = 0,
prevY = 0,
draggable = false,
img,
canvas,
context,
image,
timeout,
initImage = false,
startX = settings.x,
startY = settings.y,
scale = settings.scale,
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.zoom = function (delta)
settings.scale += delta;
settings.scale = Math.min(2, Math.max(0, settings.scale))
context.clearRect(0, 0, canvas.width, canvas.height);
container.drawMask()
container.drawImage();
container.rotate = function (rotation)
settings.rotate += rotation * Math.PI / 180;
console.log('Rotation', settings.rotate);
context.clearRect(0, 0, canvas.width, canvas.height);
container.drawMask()
container.drawImage();
container.drawMask = function ()
canvas.width = settings.maskImage.width;
canvas.height = settings.maskImage.height;
context.save();
context.beginPath();
context.globalCompositeOperation = "source-over";
// draw the masked image after scaling
context.drawImage(settings.maskImage, 0, 0, settings.maskImage.width, settings.maskImage
.height);
context.restore()
;
container.drawImage = function ()
const img = settings.image
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.save();
context.translate(settings.x + img.width / 2, settings.y + img.height / 2);
context.rotate(settings.rotate);
context.scale(settings.scale, settings.scale);
context.translate(-(settings.x + img.width / 2), -(settings.y + img.height / 2));
let width = img.width, height = img.height;
context.drawImage(img, settings.x, settings.y, width, height);
context.restore();
initImage = false;
// change the draggable image
container.loadImage = function (imageUrl)
console.log("selected image, loading");
settings.y = startY;
settings.x = startX;
prevX = prevY = 0;
initImage = true;
settings.image.src = imageUrl; // CHANGED
// sirpepole Add this
return settings.id;
;
container.onDragStart = function(evt)
console.log('Draw started');
if (evt.target.getContext)
var pixel = evt.target.getContext('2d').getImageData(evt.offsetX, evt.offsetY, 1, 1).data;
$(canvas).attr("active", "true");
container.selected(evt);
prevX = evt.clientX;
prevY = evt.clientY;
var img = new Image();
evt.originalEvent.dataTransfer.setDragImage(img, 10, 10);
evt.originalEvent.dataTransfer.setData('text/plain', 'anything');
;
container.onDragOver = function(evt)
console.log('Drag over');
if (evt.target.getContext)
var pixel = evt.target.getContext('2d').getImageData(evt.offsetX, evt.offsetY, 1, 1).data;
if (pixel[3] === 255)
if (draggable && $(canvas).attr("active") === "true")
var x = settings.x + evt.clientX - prevX;
var y = settings.y + evt.clientY - prevY;
if (x == settings.x && y == settings.y)
return; // position has not changed
settings.x += evt.clientX - prevX;
settings.y += evt.clientY - prevY;
prevX = evt.clientX;
prevY = evt.clientY;
clearTimeout(timeout);
timeout = setTimeout(function()
container.drawMask();
container.drawImage();
, 1);
else
evt.stopPropagation();
return false;
;
container.loadMaskImage = function (imageUrl, from)
console.log('loading mask image from', imageUrl, from)
canvas = document.createElement("canvas");
context = canvas.getContext('2d');
canvas.setAttribute("draggable", "true");
canvas.setAttribute("id", settings.id);
// settings.maskImageUrl = imageUrl;
settings.maskImage.src = imageUrl // CHANGED
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);
// Moved this to the settings.maskImage.onload
;
container.loadMaskImage(settings.maskImageUrl);
JQmasks.push(
item: container,
id: settings.id
)
// Edit image
div.addClass('masked-img' + settings.id);
div.attr('data-id', settings.id);
// ends
return container;
;
(jQuery));
// Zoom
//document.getElementById("img").src = json(data);
function zoom_in(button)
const id = $(button).parents('.pip').attr('data-id')
JQmasks[id].item.zoom(0.1);
function zoom_out(button)
const id = $(button).parents('.pip').attr('data-id')
JQmasks[id].item.zoom(-0.1);
// Rotate
function rotate_right(button)
const id = $(button).parents('.pip').attr('data-id')
JQmasks[id].item.rotate(20);
function rotate_left(button)
const id = $(button).parents('.pip').attr('data-id')
JQmasks[id].item.rotate(-20);
.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>
<button type="button" class="js-rotate-right" onclick="rotate_right(this)">Rotate Right</button>
<button type="button" class="js-rotate-left" onclick="rotate_left(this)">Rotate Left</button>
</div>
<img id="image" src="" style="display:none">
</span>
</template>说明
我添加了一个数据属性id 来区分图像的两个按钮。
然后，添加了一个处理按钮点击的函数（即zoom_in和zoom_out）。
function zoom_in(button)
const id = $(button).parents('.pip').attr('data-id') // to retrieve the id
JQmasks[id].item.zoom(0.1); // to zoom the correct image
function zoom_out(button)
const id = $(button).parents('.pip').attr('data-id')
JQmasks[id].item.zoom(-0.1);
现在，我们需要处理缩放功能。为此，我们需要在容器中创建一个新函数zoom。
container.zoom = function (delta)
settings.scale += delta; // increase / decrease the scale
settings.scale = Math.min(2, Math.max(0, settings.scale)) // limiting the range of the scale from 0 to 2
context.clearRect(0, 0, canvas.width, canvas.height); // clearing the whole canvas
container.drawMask(); // drawing the bow
container.drawImage(); // drawing the scaled image
我们只是更新 scale 属性，所以我们需要在绘制时使用它。所以在drawImage()函数内
container.drawImage = function ()
const img = settings.image
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.save();
context.translate(settings.x + img.width / 2, settings.y + img.height / 2); // translating the canvas to center of the image
context.scale(settings.scale, settings.scale); // scaling the canvas
context.translate(-(settings.x + img.width / 2), -(settings.y + img.height / 2)); // translating the canvas back to it's original position
let width = img.width, height = img.height;
context.drawImage(img, settings.x, settings.y, width, height);
context.restore();
initImage = false;
更新 1 - 添加了用户旋转图像的功能
说明
从处理按钮点击开始。
function rotate_right(button)
const id = $(button).parents('.pip').attr('data-id') // getting the id of the image
JQmasks[id].item.rotate(20); // rotating it by 20deg
function rotate_left(button)
const id = $(button).parents('.pip').attr('data-id')
JQmasks[id].item.rotate(-20);
现在，在容器内部，添加了一个新函数rotate() 来处理旋转
container.rotate = function (rotation)
settings.rotate += rotation * Math.PI / 180; // converting degree to radians and adding it to the previous rotation angle
console.log('Rotation', settings.rotate);
context.clearRect(0, 0, canvas.width, canvas.height); // clearing the canvas
container.drawMask(); // re-drawing the bow
container.drawImage(); // re-drawing the image
这里我们只更新旋转属性。因此，在绘制它时，我们需要使用它。对于 drawImage() 函数中的那个
context.save();
context.translate(settings.x + img.width / 2, settings.y + img.height / 2); // translating the canvas to the center of the image
context.rotate(settings.rotate); // rotating the image
context.scale(settings.scale, settings.scale); // scaling the image
context.translate(-(settings.x + img.width / 2), -(settings.y + img.height / 2)); // translating the image back to it's original position
let width = img.width, height = img.height;
context.drawImage(img, settings.x, settings.y, width, height);
context.restore();
【讨论】：
你能解释一下，你是怎么做的，你添加了哪些代码，你删除了哪些代码 @NishargShah 我已经用解释更新了我的答案 很好的解释，+1【参考方案3】：Document.getElementById("img").src = json(data);
var angle = 0;
var scale = 1;
var $img = $('#image');json 或 JSON 数据或 jsonData 请检查两次
【讨论】：
请检查控制台问题是否仅由于此代码而发生 您能解释一下您的代码应该做什么吗？现在它与作者提出的问题无关。另外，您为什么要发布两次代码？ 代码两次是错字。我在 json(data) 行上遇到了一些控制台错误。所以就举报他【参考方案4】：
var imagesize = $('img').width();
$('.zoomout').on('click', function()
imagesize = imagesize - 5;
$('img').width(imagesize);
);
$('.zoomin').on('click', function()
imagesize = imagesize + 5;
$('img').width(imagesize);
);div
height: 150px;
width: 150px;
display: block;
overflow: hidden;
outline: 2px solid #777777;
padding: 20px;
img
width: 150px;
button
font-size: 10px;
margin: 10px;
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<div><img src="img.png" /></div>
<button class="zoomout">Zoom Out</button > <button class="zoomin">Zoom In</button >【讨论】：
对不起，这对我没有帮助。我已经有了使图像缩放的代码：codepen.io/kidsdial/pen/ROBpgM，只有当我集成到我的项目中时我才会遇到问题：codepen.io/kidsdial/pen/PgxegO【参考方案5】：我解决了你的问题，但我无法得到它，我如何将这个image 添加到你的蒙版图像中，如果你知道怎么做，将此图像添加到蒙版图像中告诉我在 cmets 中，我一定会帮助你。
两天看了你的代码，我终于知道了，你不能在你的uploaded image中添加任何CSS属性，因为你的JS只改变src的值，而你的元素是由new Image()函数创建的，你没有添加任何img 标签的图形界面，所以我们无法预览它，为了解决我添加了一些功能。
解释
首先我得到你的掩码图像ID并附加img标签并在文件更改时重复更改src文件
const imgView = URL.createObjectURL(fileup.files[0]);
现在您可以预览您的图像，您可以在其上应用所有 CSS 属性，我添加了放大和缩小功能。
$('.masked-img' + getId + ' #renderImage').css(
transform: 'scale('+ scale +')'
);
我还添加了仅附加图像一次，第二次仅更改 src 值的功能
if (($(".masked-img" + newImageLoadedId + ' #renderImage').length) === 0)
$('.masked-img' + newImageLoadedId).append("<img id='renderImage' style='width: 300px' src=" + imgView + ">");
else
$('#renderImage').attr('src', imgView);
你的小提琴： https://jsfiddle.net/y7Lq9d6v/
【讨论】：
这是主要问题，我还在尝试如何为上传的图片添加img src tag....
是的，这是主要问题，但您的缩放问题在此功能中得到了解决以上是关于缩放用户上传的图像 onclick 按钮的主要内容，如果未能解决你的问题，请参考以下文章