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index.html
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<!DOCTYPE html>
<html>
<head>
<title>PDF Annotation</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prettify/r298/prettify.min.css">
<style>
body {
background-color: rgb(82, 86, 89);
}
canvas, .canvas-container {
-webkit-box-shadow: 10px 10px 5px 0px rgba(0,0,0,0.75);
-moz-box-shadow: 10px 10px 5px 0px rgba(0,0,0,0.75);
box-shadow: 10px 10px 5px 0px rgba(0,0,0,0.75);
}
.toolbar {
width: 100%;
background-color: rgb(50, 54, 57);
height: 50px;
position: fixed;
top: 0;
left: 0;
z-index: 10;
}
#pdf-container {
margin-top: 60px;
padding-left: 10px;
text-align: center;
}
button:focus {
outline: 0;
}
.toolbar .tool {
display: inline-block;
color: #fff;
height: 100%;
padding-top: 10px;
padding-left: 10px;
margin-right: 5px;
}
.toolbar .tool label,
.toolbar .tool select,
.toolbar .tool input {
display: inline-block;
width: auto;
height: auto !important;
padding: 0;
}
.toolbar .tool input {
width: 50px;
}
.toolbar .tool .color-tool {
height: 25px;
width: 25px;
border-radius: 25px;
border: 0;
cursor: pointer;
display: inline-block;
}
.toolbar .tool .color-tool.active {
-webkit-box-shadow: 3px 4px 5px 0px rgba(0,0,0,0.75);
-moz-box-shadow: 3px 4px 5px 0px rgba(0,0,0,0.75);
box-shadow: 3px 4px 5px 0px rgba(0,0,0,0.75);
}
.toolbar .tool:nth-last-child(1) {
float: right;
}
.toolbar .tool .tool-button {
background-color: rgb(50, 54, 57);
border: 1px solid rgb(50, 54, 57);
color: #fff;
cursor: pointer;
}
.toolbar .tool .tool-button:hover,
.toolbar .tool .tool-button.active {
background-color: rgb(82, 86, 89);
border-color: rgb(82, 86, 89);
}
</style>
<style>
canvas, .canvas-container {
margin-bottom: 25px;
}
.canvas-container {
margin-left: auto;
margin-right: auto;
}
</style>
</head>
<body>
<div class="toolbar">
<div class="tool">
<span>Doc Viewer</span>
</div>
<div class="tool">
<label for="">Brush size</label>
<input type="number" class="form-control text-right" value="1" id="brush-size" max="50">
</div>
<div class="tool">
<label for="">Font size</label>
<select id="font-size" class="form-control">
<option value="10">10</option>
<option value="12">12</option>
<option value="16" selected>16</option>
<option value="18">18</option>
<option value="24">24</option>
<option value="32">32</option>
<option value="48">48</option>
<option value="64">64</option>
<option value="72">72</option>
<option value="108">108</option>
</select>
</div>
<div class="tool">
<button class="color-tool active" style="background-color: #212121;"></button>
<button class="color-tool" style="background-color: red;"></button>
<button class="color-tool" style="background-color: blue;"></button>
<button class="color-tool" style="background-color: green;"></button>
<button class="color-tool" style="background-color: yellow;"></button>
</div>
<div class="tool">
<button class="tool-button active"><i class="fa fa-hand-paper-o" title="Free Hand" onclick="enableSelector(event)"></i></button>
</div>
<div class="tool">
<button class="tool-button"><i class="fa fa-pencil" title="Pencil" onclick="enablePencil(event)"></i></button>
</div>
<div class="tool">
<button class="tool-button"><i class="fa fa-font" title="Add Text" onclick="enableAddText(event)"></i></button>
</div>
<div class="tool">
<button class="tool-button"><i class="fa fa-long-arrow-right" title="Add Arrow" onclick="enableAddArrow(event)"></i></button>
</div>
<div class="tool">
<button class="tool-button"><i class="fa fa-square-o" title="Add rectangle" onclick="enableRectangle(event)"></i></button>
</div>
<div class="tool">
<button class="tool-button"><i class="fa fa-picture-o" title="Add an Image" onclick="addImage(event)"></i></button>
</div>
<div class="tool">
<button class="btn btn-danger btn-sm" onclick="deleteSelectedObject(event)"><i class="fa fa-trash"></i></button>
</div>
<div class="tool">
<button class="btn btn-danger btn-sm" onclick="clearPage()">Clear Page</button>
</div>
<div class="tool">
<button class="btn btn-info btn-sm" onclick="showPdfData()">{}</button>
</div>
<div class="tool">
<button class="btn btn-light btn-sm" onclick="savePDF()"><i class="fa fa-save"></i> Save</button>
</div>
</div>
<div id="pdf-container"></div>
<div class="modal fade" id="dataModal" tabindex="-1" role="dialog" aria-labelledby="dataModalLabel" aria-hidden="true">
<div class="modal-dialog modal-lg" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="dataModalLabel">PDF annotation data</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<pre class="prettyprint lang-json linenums">
</pre>
</div>
</div>
</div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.6.347/pdf.min.js"></script>
<script>pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.6.347/pdf.worker.min.js';</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/4.3.0/fabric.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.2.0/jspdf.umd.min.js"></script>
<script src="https://cdn.rawgit.com/google/code-prettify/master/loader/run_prettify.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prettify/r298/prettify.min.js"></script>
<script>
fabric.LineArrow = fabric.util.createClass(fabric.Line, {
type: 'lineArrow',
initialize: function(element, options) {
options || (options = {});
this.callSuper('initialize', element, options);
},
toObject: function() {
return fabric.util.object.extend(this.callSuper('toObject'));
},
_render: function(ctx) {
this.callSuper('_render', ctx);
// do not render if width/height are zeros or object is not visible
if (this.width === 0 || this.height === 0 || !this.visible) return;
ctx.save();
var xDiff = this.x2 - this.x1;
var yDiff = this.y2 - this.y1;
var angle = Math.atan2(yDiff, xDiff);
ctx.translate((this.x2 - this.x1) / 2, (this.y2 - this.y1) / 2);
ctx.rotate(angle);
ctx.beginPath();
//move 10px in front of line to start the arrow so it does not have the square line end showing in front (0,0)
ctx.moveTo(10, 0);
ctx.lineTo(-20, 15);
ctx.lineTo(-20, -15);
ctx.closePath();
ctx.fillStyle = this.stroke;
ctx.fill();
ctx.restore();
}
});
fabric.LineArrow.fromObject = function(object, callback) {
callback && callback(new fabric.LineArrow([object.x1, object.y1, object.x2, object.y2], object));
};
fabric.LineArrow.async = true;
var Arrow = (function() {
function Arrow(canvas, color, callback) {
this.canvas = canvas;
this.className = 'Arrow';
this.isDrawing = false;
this.color = color;
this.callback = callback;
this.bindEvents();
}
Arrow.prototype.bindEvents = function() {
var inst = this;
inst.canvas.on('mouse:down', function(o) {
inst.onMouseDown(o);
});
inst.canvas.on('mouse:move', function(o) {
inst.onMouseMove(o);
});
inst.canvas.on('mouse:up', function(o) {
inst.onMouseUp(o);
});
inst.canvas.on('object:moving', function(o) {
inst.disable();
})
}
Arrow.prototype.unBindEventes = function () {
var inst = this;
inst.canvas.off('mouse:down');
inst.canvas.off('mouse:up');
inst.canvas.off('mouse:move');
inst.canvas.off('object:moving');
}
Arrow.prototype.onMouseUp = function(o) {
var inst = this;
inst.disable();
inst.unBindEventes();
if (inst.callback) inst.callback();
};
Arrow.prototype.onMouseMove = function(o) {
var inst = this;
if (!inst.isEnable()) {
return;
}
var pointer = inst.canvas.getPointer(o.e);
var activeObj = inst.canvas.getActiveObject();
activeObj.set({
x2: pointer.x,
y2: pointer.y
});
activeObj.setCoords();
inst.canvas.renderAll();
};
Arrow.prototype.onMouseDown = function(o) {
var inst = this;
inst.enable();
var pointer = inst.canvas.getPointer(o.e);
var points = [pointer.x, pointer.y, pointer.x, pointer.y];
var line = new fabric.LineArrow(points, {
strokeWidth: 5,
fill: (inst.color) ? inst.color : 'red',
stroke: (inst.color) ? inst.color : 'red',
originX: 'center',
originY: 'center',
hasBorders: false,
hasControls: true,
selectable: true
});
inst.canvas.add(line).setActiveObject(line);
};
Arrow.prototype.isEnable = function() {
return this.isDrawing;
}
Arrow.prototype.enable = function() {
this.isDrawing = true;
}
Arrow.prototype.disable = function() {
this.isDrawing = false;
}
return Arrow;
}());
</script>
<script>
var PDFAnnotate = function(container_id, url, options = {}) {
this.number_of_pages = 0;
this.pages_rendered = 0;
this.active_tool = 1; // 1 - Free hand, 2 - Text, 3 - Arrow, 4 - Rectangle
this.fabricObjects = [];
this.fabricObjectsData = [];
this.color = '#212121';
this.borderColor = '#000000';
this.borderSize = 1;
this.font_size = 16;
this.active_canvas = 0;
this.container_id = container_id;
this.url = url;
this.pageImageCompression = options.pageImageCompression
? options.pageImageCompression.toUpperCase()
: "NONE";
var inst = this;
var loadingTask = pdfjsLib.getDocument(this.url);
loadingTask.promise.then(function (pdf) {
var scale = options.scale ? options.scale : 1.3;
inst.number_of_pages = pdf.numPages;
for (var i = 1; i <= pdf.numPages; i++) {
pdf.getPage(i).then(function (page) {
var viewport = page.getViewport({scale: scale});
var canvas = document.createElement('canvas');
document.getElementById(inst.container_id).appendChild(canvas);
canvas.className = 'pdf-canvas';
canvas.height = viewport.height;
canvas.width = viewport.width;
context = canvas.getContext('2d');
var renderContext = {
canvasContext: context,
viewport: viewport
};
var renderTask = page.render(renderContext);
renderTask.promise.then(function () {
$('.pdf-canvas').each(function (index, el) {
$(el).attr('id', 'page-' + (index + 1) + '-canvas');
});
inst.pages_rendered++;
if (inst.pages_rendered == inst.number_of_pages) inst.initFabric();
});
});
}
}, function (reason) {
console.error(reason);
});
this.initFabric = function () {
var inst = this;
let canvases = $('#' + inst.container_id + ' canvas')
canvases.each(function (index, el) {
var background = el.toDataURL("image/png");
var fabricObj = new fabric.Canvas(el.id, {
freeDrawingBrush: {
width: 1,
color: inst.color
}
});
inst.fabricObjects.push(fabricObj);
if (typeof options.onPageUpdated == 'function') {
fabricObj.on('object:added', function() {
var oldValue = Object.assign({}, inst.fabricObjectsData[index]);
inst.fabricObjectsData[index] = fabricObj.toJSON()
options.onPageUpdated(index + 1, oldValue, inst.fabricObjectsData[index])
})
}
fabricObj.setBackgroundImage(background, fabricObj.renderAll.bind(fabricObj));
$(fabricObj.upperCanvasEl).click(function (event) {
inst.active_canvas = index;
inst.fabricClickHandler(event, fabricObj);
});
fabricObj.on('after:render', function () {
inst.fabricObjectsData[index] = fabricObj.toJSON()
fabricObj.off('after:render')
})
if (index === canvases.length - 1 && typeof options.ready === 'function') {
options.ready()
}
});
}
this.fabricClickHandler = function(event, fabricObj) {
var inst = this;
if (inst.active_tool == 2) {
var text = new fabric.IText('Sample text', {
left: event.clientX - fabricObj.upperCanvasEl.getBoundingClientRect().left,
top: event.clientY - fabricObj.upperCanvasEl.getBoundingClientRect().top,
fill: inst.color,
fontSize: inst.font_size,
selectable: true
});
fabricObj.add(text);
inst.active_tool = 0;
}
}
}
PDFAnnotate.prototype.enableSelector = function () {
var inst = this;
inst.active_tool = 0;
if (inst.fabricObjects.length > 0) {
$.each(inst.fabricObjects, function (index, fabricObj) {
fabricObj.isDrawingMode = false;
});
}
}
PDFAnnotate.prototype.enablePencil = function () {
var inst = this;
inst.active_tool = 1;
if (inst.fabricObjects.length > 0) {
$.each(inst.fabricObjects, function (index, fabricObj) {
fabricObj.isDrawingMode = true;
});
}
}
PDFAnnotate.prototype.enableAddText = function () {
var inst = this;
inst.active_tool = 2;
if (inst.fabricObjects.length > 0) {
$.each(inst.fabricObjects, function (index, fabricObj) {
fabricObj.isDrawingMode = false;
});
}
}
PDFAnnotate.prototype.enableRectangle = function () {
var inst = this;
var fabricObj = inst.fabricObjects[inst.active_canvas];
inst.active_tool = 4;
if (inst.fabricObjects.length > 0) {
$.each(inst.fabricObjects, function (index, fabricObj) {
fabricObj.isDrawingMode = false;
});
}
var rect = new fabric.Rect({
width: 100,
height: 100,
fill: inst.color,
stroke: inst.borderColor,
strokeSize: inst.borderSize
});
fabricObj.add(rect);
}
PDFAnnotate.prototype.enableAddArrow = function () {
var inst = this;
inst.active_tool = 3;
if (inst.fabricObjects.length > 0) {
$.each(inst.fabricObjects, function (index, fabricObj) {
fabricObj.isDrawingMode = false;
new Arrow(fabricObj, inst.color, function () {
inst.active_tool = 0;
});
});
}
}
PDFAnnotate.prototype.addImageToCanvas = function () {
var inst = this;
var fabricObj = inst.fabricObjects[inst.active_canvas];
if (fabricObj) {
var inputElement = document.createElement("input");
inputElement.type = 'file'
inputElement.accept = ".jpg,.jpeg,.png,.PNG,.JPG,.JPEG";
inputElement.onchange = function() {
var reader = new FileReader();
reader.addEventListener("load", function () {
inputElement.remove()
var image = new Image();
image.onload = function () {
fabricObj.add(new fabric.Image(image))
}
image.src = this.result;
}, false);
reader.readAsDataURL(inputElement.files[0]);
}
document.getElementsByTagName('body')[0].appendChild(inputElement)
inputElement.click()
}
}
PDFAnnotate.prototype.deleteSelectedObject = function () {
var inst = this;
var activeObject = inst.fabricObjects[inst.active_canvas].getActiveObject();
if (activeObject)
{
if (confirm('Are you sure ?')) inst.fabricObjects[inst.active_canvas].remove(activeObject);
}
}
PDFAnnotate.prototype.savePdf = function (fileName) {
var inst = this;
var doc = new jspdf.jsPDF();
if (typeof fileName === 'undefined') {
fileName = `${new Date().getTime()}.pdf`;
}
inst.fabricObjects.forEach(function (fabricObj, index) {
if (index != 0) {
doc.addPage();
doc.setPage(index + 1);
}
doc.addImage(
fabricObj.toDataURL({
format: 'png'
}),
inst.pageImageCompression == "NONE" ? "PNG" : "JPEG",
0,
0,
doc.internal.pageSize.getWidth(),
doc.internal.pageSize.getHeight(),
`page-${index + 1}`,
["FAST", "MEDIUM", "SLOW"].indexOf(inst.pageImageCompression) >= 0
? inst.pageImageCompression
: undefined
);
if (index === inst.fabricObjects.length - 1) {
doc.save(fileName);
}
})
}
PDFAnnotate.prototype.setBrushSize = function (size) {
var inst = this;
$.each(inst.fabricObjects, function (index, fabricObj) {
fabricObj.freeDrawingBrush.width = size;
});
}
PDFAnnotate.prototype.setColor = function (color) {
var inst = this;
inst.color = color;
$.each(inst.fabricObjects, function (index, fabricObj) {
fabricObj.freeDrawingBrush.color = color;
});
}
PDFAnnotate.prototype.setBorderColor = function (color) {
var inst = this;
inst.borderColor = color;
}
PDFAnnotate.prototype.setFontSize = function (size) {
this.font_size = size;
}
PDFAnnotate.prototype.setBorderSize = function (size) {
this.borderSize = size;
}
PDFAnnotate.prototype.clearActivePage = function () {
var inst = this;
var fabricObj = inst.fabricObjects[inst.active_canvas];
var bg = fabricObj.backgroundImage;
if (confirm('Are you sure?')) {
fabricObj.clear();
fabricObj.setBackgroundImage(bg, fabricObj.renderAll.bind(fabricObj));
}
}
PDFAnnotate.prototype.serializePdf = function() {
var inst = this;
return JSON.stringify(inst.fabricObjects, null, 4);
}
PDFAnnotate.prototype.loadFromJSON = function(jsonData) {
var inst = this;
$.each(inst.fabricObjects, function (index, fabricObj) {
if (jsonData.length > index) {
fabricObj.loadFromJSON(jsonData[index], function () {
inst.fabricObjectsData[index] = fabricObj.toJSON()
})
}
})
}
</script>
<script>
var pdf = new PDFAnnotate("pdf-container", "Hamlet.pdf", {
onPageUpdated(page, oldData, newData) {
console.log(page, oldData, newData);
},
ready() {
console.log("Plugin initialized successfully");
},
scale: 1.5,
pageImageCompression: "MEDIUM", // FAST, MEDIUM, SLOW(Helps to control the new PDF file size)
});
function changeActiveTool(event) {
var element = $(event.target).hasClass("tool-button")
? $(event.target)
: $(event.target).parents(".tool-button").first();
$(".tool-button.active").removeClass("active");
$(element).addClass("active");
}
function enableSelector(event) {
event.preventDefault();
changeActiveTool(event);
pdf.enableSelector();
}
function enablePencil(event) {
event.preventDefault();
changeActiveTool(event);
pdf.enablePencil();
}
function enableAddText(event) {
event.preventDefault();
changeActiveTool(event);
pdf.enableAddText();
}
function enableAddArrow(event) {
event.preventDefault();
changeActiveTool(event);
pdf.enableAddArrow();
}
function addImage(event) {
event.preventDefault();
pdf.addImageToCanvas()
}
function enableRectangle(event) {
event.preventDefault();
changeActiveTool(event);
pdf.setColor('rgba(255, 0, 0, 0.3)');
pdf.setBorderColor('blue');
pdf.enableRectangle();
}
function deleteSelectedObject(event) {
event.preventDefault();
pdf.deleteSelectedObject();
}
function savePDF() {
// pdf.savePdf();
pdf.savePdf('sample.pdf'); // save with given file name
}
function clearPage() {
pdf.clearActivePage();
}
function showPdfData() {
var string = pdf.serializePdf();
$('#dataModal .modal-body pre').first().text(string);
PR.prettyPrint();
$('#dataModal').modal('show');
}
$(function () {
$('.color-tool').click(function () {
$('.color-tool.active').removeClass('active');
$(this).addClass('active');
color = $(this).get(0).style.backgroundColor;
pdf.setColor(color);
});
$('#brush-size').change(function () {
var width = $(this).val();
pdf.setBrushSize(width);
});
$('#font-size').change(function () {
var font_size = $(this).val();
pdf.setFontSize(font_size);
});
});
</script>
</body>
</html>