Hey i´m trying to blend two images with pixastic. One image can be dragged an dropped on the other image (with jqueryUI) and after it has got the right position the two images shall become one.
So i want to use the pixastic blend effect.
I tried this so far:
function BlendTheImages() {
var img = new Image();
img.onload = function() {
var blendImg = new Image();
blendImg.onload = function() {
Pixastic.process(img, "blend",
{
amount : 1,
mode : "multiply",
image : blendImg
}
);
}
blendImg.src = "Small_Image.png";
}
img.src = "Background_Big_Image.jpg";
}
The function BlendTheImages should be called, when the smaller image has the right position to blend the two images.
I don´t know if it works or how i can get the new blended image..
Please help me! Thanks
I thought about using html2canvas to grab the image but then I got really surprised when I discovered that, even though it's not documented in Pixastic's website, the Blend effect also has a callback function (that works just like the other effects):
var img = new Image();
img.onload = function() {
Pixastic.process(img, "blend",
{
amount : 1.0,
mode : "Multiply",
image : someOtherImage
}, function(blendedImg) {
console.log(blendedImg);
applySepia(blendedImg);
}
);
}
document.body.appendChild(img);
img.src = "myimage.jpg";
There's a callback for the Pixastic.process function and it works for all effects.
Related
ctx.drawImage() is not working when I use a transparent PNG, but does work when I use a regular PNG.
var context = document.getElementById("canvas").getContext('2d');
....
function draw(img, x, y){
context.drawImage(img, x, y);
}
//actulaly there is loop here, but for simplicity I put only this.
var img = new Image();
img.src = "images/a.png";
img.onload = draw(img, 10, 10);
If I use a regular PNG image it works, but with a PNG with transparency that has the background deleted, it is not working.
Do you guys have any idea why? Thank you.
img.onload takes a function reference rather than a function call.
So do this:
img.onload=function(){draw(img,10,10);}
If you need to load many images, here is an image preloader that fully loads all images before calling the start() function:
// image loader
// put the paths to your images in imageURLs[]
var imageURLs=[];
// push all your image urls!
imageURLs.push("");
imageURLs.push("");
// the loaded images will be placed in images[]
var imgs=[];
var imagesOK=0;
loadAllImages(start);
function loadAllImages(callback){
for (var i=0; i<imageURLs.length; i++) {
var img = new Image();
imgs.push(img);
img.onload = function(){
imagesOK++;
if (imagesOK>=imageURLs.length ) {
callback();
}
};
img.onerror=function(){alert("image load failed");}
img.crossOrigin="anonymous";
img.src = imageURLs[i];
}
}
function start(){
// the imgs[] array now holds fully loaded images
// the imgs[] are in the same order as imageURLs[]
}
I'm using Greensock's LoaderMax to parse an XML doc and load thumbnails and large images onto the stage - the large images are hidden off screen initially.
What I'd like to do is click on a thumbnail and have the large image tween into place, I have assigned the same name to the relevant thumbnail and image, ie 0 in thumbs corresponds to the 0 image
Thumbnails have been added to a movieclip named mc2, images are in a mc called bigDocWrap
Here's my attempt:
function callFull(event:MouseEvent):void
{
var clicked = [event.target.name];
if (isUp == true) {
// Do some stuff
fadeOut.addEventListener(TweenEvent.MOTION_FINISH, end);
function end(event:TweenEvent) {
// Some more stuff
// Animate large image in
mcDocIn = new Tween (clicked, "y", Strong.easeOut, clicked.y, -650, 1, true);
}
}
}
This didn't work - undefined reference error
mcDocIn = new Tween (bigDocWrap.clicked, "y", Strong.easeOut, bigDocWrap.clicked.y, -650, 1, true);
You are passing Name of object and not object to new Tween(). Use event.currentTarget or event.target, depends on your need.
I have updated your code like so:
function callFull(event:MouseEvent):void
{
if (isUp == true) {
// Do some stuff
fadeOut.addEventListener(TweenEvent.MOTION_FINISH, end);
function end(event:TweenEvent) {
// Some more stuff
// Animate large image in
mcDocIn = new Tween (event.currentTarget, "y", Strong.easeOut, clicked.y, -650, 1, true);
}
}
}
I'm trying to change the bitmap image in createjs and want to remove all children in a container when reset button is clicked. But removeAllChildren is not working in me.
function drawPhoneImage() {
stage = new createjs.Stage('canvas');
container = new createjs.Container();
phone = new createjs.Bitmap(phoneImg);
phone.x = 268;
phone.y = 64;
stage.addChild(container);
container.addChild(phone);
stage.update();
phone.addEventListener("click", function() {
console.log('phone clicked');
createjs.Ticker.addEventListener("tick", movePhoneImage);
});
}
function movePhoneImage(event) {
phone.x -=10;
if(phone.x < 156) {
phone.x =156;
showPhoneSnap();
}
stage.update(event);
}
Then after clicking the phone object, I'll need to replace it with another bitmap(which works):
function showPhoneSnap() {
snap = new createjs.Bitmap(snapImg);
snap.x = 156;
snap.y = 64;
container.removeAllChildren();
container.addChild(snap);
stage.update();
}
At first, removeAllChildren is working in the first child of the container, but when i tried resetting the stage after adding another bitmap in the container..removeAllChildren() is not working.
function resetStage() {
container.removeAllChildren();
stage.update();
}
I'm having a hard time solving this issue, thanks for anyone who can help.
Make sure that "snapImg" is an image that is loaded.
snap = new createjs.Bitmap(snapImg);
The issue is that you are not updating the stage when the image is loaded.
var image = new Image();
image.src = "path";
image.onload = showPhoneSnap;
function showPhoneSnap() {
//This will ensure that the image is ready.
var bmp = new createjs.Bitmap(this);
...
stage.update();
}
I'm using the iviewer plugin with a lightbox and I have issue to center my image everytime it load a new image.
I know that there is a pre-built method center() I just don't undertand how and where to call it.
You can find the function I'm using under. The function is called when I click on an element, it open a box div(#iviewer). In which I would like my image center. I also use a zoom pourcentage at the beginning so my image doesn't fit the box (var viewer).
function open(src, id) {
var firstZoom = true;
$("#iviewer").fadeIn().trigger('fadein');
var viewer = $("#iviewer .viewer").
width(920).
height(560).
iviewer({
src : src,
ui_disabled : true,
zoom : '50%',
initCallback : function() {
var self = this;
},
onZoom : function() {
if (!firstZoom) return;
$("#iviewer .loader").fadeOut();
$("#iviewer .viewer").fadeIn();
firstZoom = true;
}
}
);
//load new pic
viewer.iviewer('loadImage', src);
}
Thanks for the help.
The "onFinishLoad" callback hook in the initialization worked for me:
onFinishLoad: function(ev, src){ viewer.iviewer('center')}
I'm generating street view static images like so:
https://maps.googleapis.com/maps/api/streetview?size=1080x400&location=%s&fov=90&heading=235&pitch=0&key=%s
If you visit that link you see an image that says, "Sorry, we have no imagery for this..."
Is there any way to detect this "sorry" state so that I can fall back to another image?
One quick solution would be to load the image file using xmlrpc and check that its md5sum is 30234b543d5438e0a0614bf07f1ebd25, or that its size is 1717 bytes (it's unlikely that another image can have exactly the same size), but that's not very robust since I have seen Google change the position of the text in the image. Though it's a very good start for a prototype.
You could go for image processing instead. Note that it's still not perfectly robust since Google could decide to change the looks of the image anytime. You'll have to decide whether it's worth it.
Anyway, here is how I would do it using jQuery:
load the image and open a 2D context for direct pxiel access (see this question for how to do it)
analyse the image:
sample groups of 2×2 pixels at random locations; I recommend at least 30 groups
a group of 2×2 pixels is good if all the pixels have the same value and their R/G/B values do not differ by more than 10% (ie. they're grey)
count the ratio of good pixel groups in the image
if there are more than 70% good pixel groups, then we are pretty sure this is the “no imagery” version: replace it with another image of your choice.
The reason I do not recommend testing directly for an RGB value is because JPEG decompression may have slightly different behaviours on different browsers.
this situation is already build in in the 3.0 version due
the boolean test status === streetviewStatus.Ok, here is a snippet from my situation solving
if (status === google.maps.StreetViewStatus.OK) {
var img = document.createElement("IMG");
img.src = 'http://maps.googleapis.com/maps/api/streetview?size=160x205&location='+ lat +','+ lng +'&sensor=false&key=AIzaSyC_OXsfB8-03ZXcslwOiN9EXSLZgwRy94s';
var oldImg = document.getElementById('streetViewImage');
document.getElementById('streetViewContainerShow').replaceChild(img, streetViewImage);
} else {
var img = document.createElement("IMG");
img.src = '../../images/ProfilnoProfilPicture.jpg';
img.height = 205;
img.width = 160;
var oldImg = document.getElementById('streetViewImage');
document.getElementById('streetViewContainerShow').replaceChild(img, streetViewImage);
}
As of 2016, you can use the new Street View Image Metadata API.
Now you just need the status field to know if a panorama is found.
Example requests:
https://maps.googleapis.com/maps/api/streetview/metadata?size=600x300&location=78.648401,14.194336&fov=90&heading=235&pitch=10&key=YOUR_API_KEY
{
"status" : "ZERO_RESULTS"
}
https://maps.googleapis.com/maps/api/streetview/metadata?size=600x300&location=eiffel%20tower,%20paris,%20france&heading=-45&pitch=42&fov=110&key=YOUR_API_KEY
{
...
"status" : "OK"
}
You can use the getPanoramaByLocation function (see http://code.google.com/apis/maps/documentation/javascript/services.html#StreetViewService).
try something like this:
function handleMapClick()
{
var ll= new google.maps.LatLng(latitude,longitude);
sv.getPanoramaByLocation(ll, 50, processSVData);
}
function processSVData(data, status) {
if (status==google.maps.StreetViewStatus.ZERO_RESULTS)
{
<DO SOMETHING>
}
}
Request a google street view image and if it has a specific file size it is a 'Not street view avaible'. I did the follwing:
var url = 'google street view url';
var xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.responseType = 'blob';
xhr.onload = function (e) {
if (this.status == 200) {
try {
var image = new Blob([this.response], {type: 'image/jpeg'});
if (image.size) {
if (url.indexOf('640x640') > -1 && image.size === 8410) {
// Not street view
}
if (url.indexOf('400x300') > -1 && image.size === 3946) {
// Not street view
}
}
} catch (err) {
// IE 9 doesn't support blob
}
}
};
xhr.send();
Another way is to load the image and then compare some pixels colors. The "no streetview" image from google is always the same. Here is how you would compare 2 pixels:
var url = STREETVIEWURL
var img = new Image();
// Add some info to prevent cross origin tainting
img.src = url + '?' + new Date().getTime();
img.setAttribute('crossOrigin', '');
img.crossOrigin = "Anonymous";
img.onload = function() {
var context = document.createElement('CANVAS').getContext('2d');
context.drawImage(img, 0, 0);
//load 2 pixels. I chose the first one and the 5th row
var data1 = context.getImageData(0, 0, 1, 1).data;
var data2 = context.getImageData(0, 5, 1, 1).data;
console.log(data1);
// google unknown image is this pixel color [228,227,223,255]
if(data1[0]==228 && data1[1]==227 && data1[2]==223 && data1[3]==255 &&
data2[0]==228 && data2[1]==227 && data2[2]==223 && data2[3]==255){
console.log("NO StreetView Available");
}else{
console.log("StreetView is Available");
}
};
Some potential issues:
I've seen some errors with CrossOrigin tainting. Also, if google changes the image returned this code will break.