Zoom the user uploaded image onclick button
You have some scope issues, and some other stuff. I tried to comment as I went. I also fixed issues with missing and extra semi-colons.
I created a global object myApp. to hold the stuff instead of a large number of global variables.
Usability: the "+" asks for something to upload but it is not clear (to me) what right off, users may note that also - but that is opinion not fact. I do not see those "edit" or anything like that so your zoom perhaps is wrapped in that lost code? I have no idea there.
Now the QUESTION: zoom on the image - your "upload" is bleeding through, you have duplicate id on the canvas. I do not know enough about what you are attempting to do to get this better.
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.angle}deg) 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-in{border: 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>Have a try with this code. @PranavNutalapati helped me figure this out.
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>Explanation
I have added a data attribute id to differentiate both the image's buttons.
Then, added a function to handle the button clicks (zoom_in and zoom_out namely).
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);
}
Now, we need to handle the zoom functionality. For that, we need to create a new function zoom within the container.
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
}
We are only updating the scale property, so we need to make use of it while drawing it. So within the drawImage() function
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;
}
Update 1 - Added functionality for the user to rotate the image
Explanation
Starting with handling the button click.
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);
}
Now, inside the container, a new function rotate() has been added to handle the rotation
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
}
Here we are only updating the rotation property. So, while drawing it we need to use that. For that inside the drawImage() function
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();