i have this code. and i want when i press download image that it will show the filtered image in my designed webpage. someone can help me how can i do this?
i know i have to change something here in the url. but its dont working and i dont really know why:
var url = canvas.toDataURL("image/png;base64;"); downloadImage.attr('href', url);
please help me.
$(function() {
/*
In this code, we are going to do the following:
1. Accept an image on drag and drop
2. Create a new canvas element (original), with a max size
of 500x500px (customizable) and keep it in memory
3. Listen for clicks on the filters. When one is selected:
3.1 Create a clone of the original canvas
3.2 Remove any canvas elements currently on the page
3.3 Append the clone to the #photo div
3.4 If the selected filter is different from the "Normal"
one, call the Caman library. Otherwise do nothing.
3.5 Mark the selected filter with the "active" class
4. Trigger the "Normal" filter
*/
var maxWidth = 500,
maxHeight = 500,
photo = $('#photo'),
originalCanvas = null,
filters = $('#filters li a'),
filterContainer = $('#filterContainer');
// Use the fileReader plugin to listen for
// file drag and drop on the photo div:
photo.fileReaderJS({
on:{
load: function(e, file){
// An image has been dropped.
var img = $('<img>').appendTo(photo),
imgWidth, newWidth,
imgHeight, newHeight,
ratio;
// Remove canvas elements left on the page
// from previous image drag/drops.
photo.find('canvas').remove();
filters.removeClass('active');
// When the image is loaded successfully,
// we can find out its width/height:
img.load(function() {
imgWidth = this.width;
imgHeight = this.height;
// Calculate the new image dimensions, so they fit
// inside the maxWidth x maxHeight bounding box
if (imgWidth >= maxWidth || imgHeight >= maxHeight) {
// The image is too large,
// resize it to fit a 500x500 square!
if (imgWidth > imgHeight) {
// Wide
ratio = imgWidth / maxWidth;
newWidth = maxWidth;
newHeight = imgHeight / ratio;
} else {
// Tall or square
ratio = imgHeight / maxHeight;
newHeight = maxHeight;
newWidth = imgWidth / ratio;
}
} else {
newHeight = imgHeight;
newWidth = imgWidth;
}
// Create the original canvas.
originalCanvas = $('<canvas>');
var originalContext = originalCanvas[0].getContext('2d');
// Set the attributes for centering the canvas
originalCanvas.attr({
width: newWidth,
height: newHeight
}).css({
marginTop: -newHeight/2,
marginLeft: -newWidth/2
});
// Draw the dropped image to the canvas
// with the new dimensions
originalContext.drawImage(this, 0, 0, newWidth, newHeight);
// We don't need this any more
img.remove();
filterContainer.fadeIn();
// Trigger the default "normal" filter
filters.first().click();
});
// Set the src of the img, which will
// trigger the load event when done:
img.attr('src', e.target.result);
},
beforestart: function(file){
// Accept only images.
// Returning false will reject the file.
return /^image/.test(file.type);
}
}
});
// Listen for clicks on the filters
filters.click(function(e){
e.preventDefault();
var f = $(this);
if(f.is('.active')){
// Apply filters only once
return false;
}
filters.removeClass('active');
f.addClass('active');
// Clone the canvas
var clone = originalCanvas.clone();
// Clone the image stored in the canvas as well
clone[0].getContext('2d').drawImage(originalCanvas[0],0,0);
// Add the clone to the page and trigger
// the Caman library on it
photo.find('canvas').remove().end().append(clone);
var effect = $.trim(f[0].id);
Caman(clone[0], function () {
// If such an effect exists, use it:
if( effect in this){
this[effect]();
this.render();
// Show the download button
showDownload(clone[0]);
}
else{
hideDownload();
}
});
});
// Use the mousewheel plugin to scroll
// scroll the div more intuitively
filterContainer.find('ul').on('mousewheel',function(e, delta){
this.scrollLeft -= (delta * 50);
e.preventDefault();
});
var downloadImage = $('a.downloadImage');
function showDownload(canvas){
downloadImage.off('click').click(function(){
// When the download link is clicked, get the
// DataURL of the image and set it as href:
var url = canvas.toDataURL("image/png;base64;");
downloadImage.attr('href', url);
}).fadeIn();
}
function hideDownload(){
downloadImage.fadeOut();
}
});
You can try this:
var downloadImage = $('a.downloadImage');
var url = canvas.toDataURL("image/png;base64;");
downloadImage.attr('href', url);
Related
I have a fabricjs canvas that I need to be able to zoom in and out and also change the image/object inside several times.
For this I setup the canvas in the first time the page loads like this:
fabric.Object.prototype.hasBorders = false;
fabric.Object.prototype.hasControls = false;
canvas = new fabric.Canvas('my_canvas', {renderOnAddRemove: false, stateful: false});
canvas.defaultCursor = "pointer";
canvas.backgroundImageStretch = false;
canvas.selection = false;
canvas.clear();
var image = document.getElementById('my_image');
if (image != null) {
imageSrc = image.src;
if(imageSrc.length > 0){
fabric.Image.fromURL(imageSrc, function(img) {
img = scaleImage(canvas, img); //shrinks the image to fit the canvas
img.selectable = false;
canvas.centerObject(img);
canvas.setActiveObject(img);
canvas.add(img);
});
}
}
canvas.deactivateAll().renderAll();
Then when I need to change the image/object in the canvas or when the page reloads, I try to reset the canvas like this:
canvas.clear();
canvas.remove(canvas.getActiveObject());
var image = document.getElementById('my_image');
if (image != null) {
imageSrc = image.src;
if(imageSrc.length > 0){
fabric.Image.fromURL(imageSrc, function(img) {
img = scaleImage(canvas, img); //shrinks the image to fit the canvas
img.selectable = false;
canvas.centerObject(img);
canvas.setActiveObject(img);
canvas.add(img);
});
}
}
Not sure if it matters but the way I change the image is by changing the source in 'my_image' and reseting the canvas with the above method.
This works well until I use canvas.zoomToPoint, as per this thread, after this, the image/object starts changing position when I reset the zoom or click the canvas with the mouse while it is zoomed, seeming to jump at each change in the top left corner direction, eventually disappearing from view.
Reset Zoom:
canvas.setZoom(1);
resetCanvas(); //(above method)
How can I restore the image/object position?
I tried doing the initial setup instead of the reset and seamed to work visually but was in fact adding a new layer of upper canvas at each new setup so it is no good.
Is there a way to reset the canvas to original state without causing this behavior and still be able to zoom in/out correctly?
Although this question is very old, here is what I did using the current version of fabric.js 2.2.4:
canvas.setViewportTransform([1,0,0,1,0,0]);
For your information: zooming to a point is a recalculation of the viewport transformation. The upper matrix is this is the initial viewport transform matrix.
I eventually fixed the problems I was having.
To reset the zoom, instead of just setting the zoom to 1 with canvas.setZoom(1), I reapplied the canvas.zoomToPoint method to the same point but with zoom 1, to force the initial zoom but regarding the same point that was used to zoom in.
As for the problem of restoring the image position in canvas (after panning for instance) it is as simple as removing the image, centering it in the canvas and re-adding it to the canvas as was done when adding first time:
var img = canvas.getActiveObject();
canvas.remove(img);
canvas.centerObject(img);
canvas.setActiveObject(img);
canvas.add(img);
canvas.renderAll();
See below snippet - here I do the same - zooming together, but degrouping the objects in case somebody clicks on it.
The problem to get to original object properties can be solved, ungrouping the group and creating copies of them and reattaching - a bit annoying, but the only solution I found.
<script id="main">
// canvas and office background
var mainGroup;
var canvas = this.__canvas = new fabric.Canvas('c');
fabric.Object.prototype.transparentCorners = false;
fabric.Object.prototype.originX = fabric.Object.prototype.originY = 'center';
createOnjects(canvas);
// events - zoom
$(canvas.wrapperEl).on('mousewheel', function(e) {
var target = canvas.findTarget(e);
var delta = e.originalEvent.wheelDelta / 5000;
if (target) {
target.scaleX += delta;
target.scaleY += delta;
// constrain
if (target.scaleX < 0.1) {
target.scaleX = 0.1;
target.scaleY = 0.1;
}
// constrain
if (target.scaleX > 10) {
target.scaleX = 10;
target.scaleY = 10;
}
target.setCoords();
canvas.renderAll();
return false;
}
});
// mouse down
canvas.on('mouse:up', function(options) {
if (options.target) {
var thisTarget = options.target;
var mousePos = canvas.getPointer(options.e);
if (thisTarget.isType('group')) {
// unGroup
console.log(mousePos);
var clone = thisTarget._objects.slice(0);
thisTarget._restoreObjectsState();
for (var i = 0; i < thisTarget._objects.length; i++) {
var o = thisTarget._objects[i];
if (o._element.alt == "officeFloor")
continue;
else {
if (mousePos.x >= o.originalLeft - o.currentWidth / 2 && mousePos.x <= o.originalLeft + o.currentWidth / 2
&& mousePos.y >= o.originalTop - o.currentHeight / 2 && mousePos.y <= o.originalTop + o.currentHeight / 2)
console.log(o._element.alt);
}
}
// remove all objects and re-render
canvas.remove(thisTarget);
canvas.clear().renderAll();
var group = new fabric.Group();
for (var i = 0; i < clone.length; i++) {
group.addWithUpdate(clone[i]);
}
canvas.add(group);
canvas.renderAll();
}
}
});
// functions
function createOnjects(canvas) {
// ToDo: jQuery.parseJSON() for config file (or web service)
fabric.Image.fromURL('pics/OfficeFloor.jpg', function(img) {
var back = img.set({ left: 100, top: 100 });
back._element.alt = "officeFloor";
back.hasControls = false;
fabric.Image.fromURL('pics/me.png', function(img) {
var me = img.set({ left: -420, top: 275 });
me._element.alt = "me";
console.log(me);
var group = new fabric.Group([ back, me], { left: 700, top: 400, hasControls: false });
canvas.clear().renderAll();
canvas.add(group);
// remove all objects and re-render
});
});
}
</script>
Working JSFiddle before attempting to implement: http://jsfiddle.net/qa9m7t33/
After attempting to implement: http://jsfiddle.net/z1k538sm/
I found how to resize an image however I believe this was not an example for being it prior upload and I am pretty new to this. What I believe is wrong is the variable;'
var width = e.target.result.width(); // Current image width
var height = e.target.result.height(); // Current image height
I am also having the problem with centering my text in the upload field.
Updated Fiddle: http://jsfiddle.net/m5jLf259/
Not exactly a Js answer to this but adding a line-height CSS to the element
#file {
line-height: 37px;
}
will get the job done, I guess if you want it to be jQuery you could do
$('#file').css('line-height',$('#file').height() + 'px');
As for the first part of your problem I couldn't make out a question, sorry.
Edit:
for the first part try this:
var wrapper = $('<div/>').css({height:0,width:0,'overflow':'hidden'});
var fileInput = $(':file').wrap(wrapper);
fileInput.change(function(){
readURL(this);
})
$('#file').click(function(){
fileInput.click();
}).show();
function readURL(input) {
$('#blah').hide();
if (input.files && input.files[0]) {
var goUpload = true;
var uploadFile = input.files[0];
if (!(/\.(gif|jpg|jpeg|tiff|png)$/i).test(uploadFile.name)) {
$('#file').effect( "shake" );
$('#file').text('You must select an image file only');
setTimeout(function() { $('#file').text('Choose file');},5000);
goUpload = false;
}
if (uploadFile.size > 2000000) { // 2mb
//common.notifyError('Please upload a smaller image, max size is 2 MB');
$('#file').text('Please upload a smaller image, max size is 2 MB');
setTimeout(function() { $('#file').text('Choose file');},5000);
goUpload = false;
}
if (goUpload) {
$('#file').text("Uploading "+uploadFile.name);
var reader = new FileReader();
reader.onload = function (e) {
var img = new Image;
img.onload = function() {
var maxWidth = 100; // Max width for the image
var maxHeight = 100; // Max height for the image
var ratio = 0; // Used for aspect ratio
var width = this.width; // Current image width
var height = this.height; // Current image height
// Check if the current width is larger than the max
if (width > maxWidth) {
ratio = maxWidth / width; // get ratio for scaling image
$('#blah').css("width", maxWidth); // Set new width
$('#blah').css("height", height * ratio); // Scale height based on ratio
height = height * ratio; // Reset height to match scaled image
}
// Check if current height is larger than max
if (height > maxHeight) {
ratio = maxHeight / height; // get ratio for scaling image
$('#blah').css("height", maxHeight); // Set new height
$('#blah').css("width", width * ratio); // Scale width based on ratio
width = width * ratio; // Reset width to match scaled image
}
$('#blah').attr('src', this.src).show();
$('#file').text(uploadFile.name);
};
img.src = reader.result;
}
reader.readAsDataURL(uploadFile);
}
}
}
You shouldn't have the part where it says:
47 var width = uploadFile.width(); // Current image width
48 var height = uploadFile.height(); // Current image height
twice because you're just undoing your work from the previous IF.
Also it seems the FileReader() is unable to get the image size properties so instead have FileReader, create an image Object, and then make the image Object's onload do all the work.
I'm using this plugin to create image zoom and gallery, yet I want to scale all images to fit with the container (using ratio algorithm).
Here is ratio function :
function scaleSize(maxW, maxH, currW, currH){
var ratio = currH / currW;
if(currW >= maxW && ratio <= 1){
currW = maxW;
currH = currW * ratio;
} else if(currH >= maxH){
currH = maxH;
currW = currH / ratio;
}
return [currW, currH];
}
And this is how the gallery load images :
var img = $('<img>').load(function(){
img.appendTo(a);
image_container.html(a);
}).attr('src', src).addClass(opts.big_image_class);
What I've tried :
var newSize = scaleSize(300, 320, $(".simpleLens-big-image").width(), $(".simpleLens-big-image").height());
var img = $('<img>').load(function(){
img.appendTo(a);
image_container.html(a);
}).attr('src', src).addClass(opts.big_image_class).width(newSize[0]).height(newSize[1]);
But scaleSize is not working properly since the current width and height is not yet defined (image not yet exist in dom).
Thanks for any pointers.
I took a look into plugin code and think you call your scaleSize() too early. An image with class simpleLens-big-image exists first after var img is set up and addClass() is done.
Try following:
var img = $('<img>').load(function(){
img.appendTo(a);
image_container.html(a);
}).attr('src', src).addClass(opts.big_image_class);
// at this point img should contain $(".simpleLens-big-image") so we can refer to img
var newSize = scaleSize(300, 320, img[0].naturalWidth, img[0].naturalHeight());
img.width(newSize[0]).height(newSize[1]);
Try something like this and call the onload method. This will make sure that the image is loaded to the DOM before you resize
var img = $('<img>');
img.src = src ;
img.onload = function() {
// Run onload code.
} ;
I'm trying to load an image from a given link
var imgPath = $(imgLink).attr('href');
and append it to the page, so I can insert it into a given element for an image viewer.
Even though I searched Stackoverflow and the jQuery docs without end, I can't figure it out.
After I load the image, I want to set different values to it, like width, height, etc.
Update:
This is what I got. The problem I'm having is that I can't run jQuery functions on the img element.
function imagePostition(imgLink) {
// Load the image we want to display from the given <a> link
// Load the image path form the link
var imgPath = $(imgLink).attr('href');
// Add image to html
$('<img src="'+ imgPath +'" class="original">').load(function() {
$(imgLink).append(this);
var img = this;
// Resize the image to the window width
// http://stackoverflow.com/questions/1143517/jquery-resizing-image
var maxWidth = $(window).width(); // window width
var maxHeight = $(window).height(); // window height
var imgWidth = img.width; // image width
var imgHeight = img.height; // image height
var ratio = 0; // resize ration
var topPosition = 0; // top image position
var leftPostition = 0; // left image postiton
// calculate image dimension
if (imgWidth > maxWidth) {
ratio = imgHeight / imgWidth;
imgWidth = maxWidth;
imgHeight = (maxWidth * ratio);
}
else if (imgHeight > maxHeight) {
ratio = imgWidth / imgHeight;
imgWidth = (maxHeight * ratio);
imgHeight = maxHeight;
}
// calculate image position
// check if the window is larger than the image
// y position
if(maxHeight > imgHeight) {
topPosition = (maxHeight / 2) - (imgHeight / 2);
}
// x position
if(maxWidth > imgWidth) {
leftPostition = (maxWidth / 2) - (imgWidth / 2);
}
$(imgLink).append(img);
// Set absolute image position
img.css("top", topPosition);
img.css("left", leftPostition);
// Set image width and height
img.attr('width', imgWidth);
img.attr('height', imgHeight);
// Add backdrop
$('body').prepend('<div id="backdrop"></div>');
// Set backdrop size
$("#backdrop").css("width", maxWidth);
$("#backdrop").css("height", maxHeight);
// reveal image
img.animate({opacity: 1}, 100)
img.show()
});
};
$('<img src="'+ imgPath +'">').load(function() {
$(this).width(some).height(some).appendTo('#some_target');
});
If you want to do for several images then:
function loadImage(path, width, height, target) {
$('<img src="'+ path +'">').load(function() {
$(this).width(width).height(height).appendTo(target);
});
}
Use:
loadImage(imgPath, 800, 800, '#some_target');
Here is the code I use when I want to preload images before appending them to the page.
It is also important to check if the image is already loaded from the cache (for IE).
//create image to preload:
var imgPreload = new Image();
$(imgPreload).attr({
src: photoUrl
});
//check if the image is already loaded (cached):
if (imgPreload.complete || imgPreload.readyState === 4) {
//image loaded:
//your code here to insert image into page
} else {
//go fetch the image:
$(imgPreload).load(function (response, status, xhr) {
if (status == 'error') {
//image could not be loaded:
} else {
//image loaded:
//your code here to insert image into page
}
});
}
var img = new Image();
$(img).load(function(){
$('.container').append($(this));
}).attr({
src: someRemoteImage
}).error(function(){
//do something if image cannot load
});
after you get the image path, try either of following ways
(as you need to set more attr than just the src)
build the html and replace to the target region
$('#target_div').html('<img src="'+ imgPaht +'" width=100 height=100 alt="Hello Image" />');
you may need to add some delay if changing the "SRC" attr
setTimeout(function(){///this function fire after 1ms delay
$('#target_img_tag_id').attr('src',imgPaht);
}, 1);
I imagine that you define your image something like this:
<img id="image_portrait" src="" alt="chef etat" width="120" height="135" />
You can simply load/update image for this tag and chage/set atts (width,height):
var imagelink;
var height;
var width;
$("#image_portrait").attr("src", imagelink);
$("#image_portrait").attr("width", width);
$("#image_portrait").attr("height", height);
With jQuery 3.x use something like:
$('<img src="'+ imgPath +'">').on('load', function() {
$(this).width(some).height(some).appendTo('#some_target');
});
I use the Jquery Jcrop for cropping my images. Now I'm implementing a slider for resizing the image. I want the cropping and resizing to happend on the same page.
I do it like this:
$(document).ready(function() {
var img = $('#cropbox')[0]; // Get my img elem
var orgwidth, orgheight;
$("<img/>") // Make in memory copy of image to avoid css issues
.attr("src", $(img).attr("src"))
.load(function() {
orgwidth = this.width; // Note: $(this).width() will not
orgheight = this.height; // work for in memory images.
});
$('#cropbox').Jcrop({
onSelect: updateCoords
});
$("#imageslider").slider({
value: 100,
max: 100,
min: 1,
slide: function(event, ui) {
//$('ul#grid li').css('font-size',ui.value+"px");
resizeImage(orgwidth, orgheight);
}
});
});
And my simple resizeImage function:
function resizeImage(orgwidth, orgheight) {
var value = $('#imageslider').slider('option', 'value');
var width = orgwidth * (value / 100);
var height = orgheight * (value / 100);
$('#cropbox').width(width);
$('#cropbox').height(height);
$('#tester').val("org: "+orgwidth+" now: "+width);
}
The problem is that, as soon I turn on Jcrop I can't resize the image. How can I use both these functions at the same time?
I ended up destroying the jCrop while resizing and putting it back on after resize. Thanks anyway. Code:
function resizeImage(orgwidth, orgheight) {
jcrop_api.destroy();
var value = $('#imageslider').slider('option', 'value');
var width = orgwidth * (value / 100);
var height = orgheight * (value / 100);
$('#cropbox').width(width);
$('#cropbox').height(height);
$('#rw').val(width);
$('#rh').val(height);
initJcrop();
}
I had the same task to accomplish: resize the image with a slider where jCrop is applied. There are some more elements you have to resize also that jCrop created, not only the image. I ended up patching the jCrop plugin and here is the patch for latest jCrop-0.9.10.
Patch your jCrop. If you don't know how to apply the patch, just put the resizeImage function to line 1578 of jCrop (unimified version ofcourse):
--- /home/dr0bz/Desktop/jquery.Jcrop.js
+++ /home/dr0bz/workspace/profile_tuning/js/lib/jquery.Jcrop.js
## -1573,6 +1573,15 ##
ui: {
holder: $div,
selection: $sel
+ },
+
+ resizeImage: function(width, height) {
+ boundx = width;
+ boundy = height;
+ $([$img2, $img, $div, $trk]).each(function(index, element)
+ {
+ element.width(width).height(height);
+ });
}
};
Get the jCrop API:
var jCropApi;
$('#photo').Jcrop({}, function()
{
jCropApi = this;
});
Calc new height and width. If your are doing it with a slider, let the slider say return the new width of the image and you calculate new height with aspect ratio of the image:
var aspectRatio = width / height;
// newWidth returned by slider
var newHeight = Math.round(width / aspectRatio);
jCropApi.resizeImage(newWidth, newHeight);
There are some other points to keep an eye on. After each resize your should look that crop area is still in the viewport of the image. If you need i could post the complete source how i've done it for me: jCrop + jquery ui slider to resize the image.
Regards
What you can also do is make use of the setImage function of Jcrop, when the slider changes, call the setImage with the Jcrop api and set new width and height values like this:
var jcrop_api;
$('#cropbox').Jcrop({
onSelect: updateCoords
}, function() {
jcrop_api = this;
});
$("#imageslider").slider({
value: 100,
max: 100,
min: 1,
slide: function(event, ui) {
var value = $('#imageslider').slider('option', 'value');
var width = orgwidth * (value / 100);
var height = orgheight * (value / 100);
jcrop_api.setImage($(img).attr("src"), function() {
this.setOptions({
boxWidth: width,
boxHeight: height
});
});
$('#tester').val("org: "+orgwidth+" now: "+width);
}
});
What I am not sure about this technique is if it is the best solution because everytime you call the setImage function, jcrop creates a new Image object.
If what you want is that the resizing should be proportional, I don't think you need the slider (since it seems to be incompatible with jCrop). You could use jCrop and in the onChange event, ensure the proportionality (that is, implement the resizeImage function, modified).
That's what I think.
As an extension to Hermann Bier answer, i have added the jquery animation.
The resizing looks way better when it's animated :)
Implemented in Jcrop version: jquery.Jcrop.js v0.9.12
Locate the code:
ui: {
holder: $div,
selection: $sel
}
in jquery.Jcrop.js around line 1573
and replace it with:
ui: {
holder: $div,
selection: $sel
},
resizeImage: function(width, height) {
animationsTid = 500;
boundx = width;
boundy = height;
$($img2).animate({
width: width,
height: height,
}, { duration: animationsTid, queue: false });
$($img).animate({
width: width,
height: height,
}, { duration: animationsTid, queue: false });
$($div).animate({
width: width,
height: height,
}, { duration: animationsTid, queue: false });
$($trk).animate({
width: width,
height: height,
}, { duration: animationsTid, queue: false });
/*
//Old way of resizing, but without animation
$([$img2, $img, $div, $trk]).each(function(index, element){
element.width(width).height(height);
});
*/
}
Call to the function will animate the resize.
Feel free to delete the code between /* */ - I just kept it as an reference
Happy Coding :)