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Get correct click position on scaled image

This is how I get the click position when clicking on an image to do some image transformation. But my problem is, that the image has the CSS attribute max-width: 1000px. So the code works only for images which are smaller. For larger images the position result is not the real pixel which was clicked on.
My question is, if it is possible to calculate the correct click position for the natural sized image. An alternative would be to set some data attributes with the real image size like data-width: '1200px' and data-height: '1000px'. But still I have to do some calculation.
parentPosition = getPosition(event.currentTarget),
x = event.clientX - parentPosition.x,
y = event.clientY - parentPosition.y;
function getPosition(element) {
var xPosition = 0;
var yPosition = 0;
while (element) {
xPosition += (element.offsetLeft - element.scrollLeft + element.clientLeft);
yPosition += (element.offsetTop - element.scrollTop + element.clientTop);
element = element.offsetParent;
}
return { x: xPosition, y: yPosition };
}

If you know natural size and current size, i think you can just do this:
naturalClickPosX = (naturalWidth / currentWidth) * currentClickPosX;
naturalClickPosY = (naturalHeight / currentHeight) * currentClickPosY;
Have a look at this JSFiddle
HTML
<img src="http://placehold.it/1200x1000" width="1000">
JavaScript
$('img').on("click", function(e){
var $img = $(this);
var currentClickPosX = e.pageX - $img.offset().left;
var currentClickPosY = e.pageY - $img.offset().top;
var currentWidth = $img.width();
var currentHeight = $img.height();
var naturalWidth = this.naturalWidth;
var naturalHeight = this.naturalHeight;
var naturalClickPosX = ((naturalWidth / currentWidth) * currentClickPosX).toFixed(0);
var naturalClickPosY = ((naturalHeight / currentHeight) * currentClickPosY).toFixed(0);
alert("Current X: " + currentClickPosX + " Current Y: " + currentClickPosY +
"\r\nNatural X: " + naturalClickPosX + " Natural Y: " + naturalClickPosY);
});

try this , will work on all sizes
$('.img-coordinate').click(function(e){
var parentOffset = $(e.target).parent().offset();
// here the X and Y on Click
X = e.pageX - $(e.target).offset().left;
Y = e.pageY - $(e.target).offset().top;
alert(X + ' , ' + Y );
});
working fiddel : https://jsfiddle.net/h09kfsoo/

Wordpress - widget save button break jquery

So, I have a widget. I can add div's after click through .append
When I add for example 5 divs and click save all of them dissapear. Also I can't add another divs. I need to reload wpadmin page then I can add it again.
I found something like this but it seems to not working for me. Any ideas?
My js file
jQuery(document).ready(function($){
// basic add
$("button#remove").click(function(){
$(".marker").remove();
});
//add with position
var map = $(".map");
var pid = 0;
function AddPoint(x, y, maps) {
var marker = $('<div class="marker"></div>');
marker.css({
"left": x,
"top": y
});
marker.attr("id", "point-" + pid++);
$(maps).append(marker);
$('.marker').draggable({
stop: function(event, ui) {
var thisNew = $(this);
var x = (ui.position.left / thisNew.parent().width()) * 100 + '%';
var y = (ui.position.top / thisNew.parent().height()) * 100 + '%';
thisNew.css('left', x);
thisNew.css('top', y);
console.log(x, y);
}
});
}
map.click(function (e) {
var x = e.offsetX/ $(this).width() * 100 + '%';
var y = e.offsetY/ $(this).height() * 100 + '%';
AddPoint(x, y, this);
});
});

Javascript Circle slider degrees to time

I am looking at this slider http://jsfiddle.net/sCanr/1/.
(function () {
var $container = $('#container');
var $slider = $('#slider');
var sliderW2 = $slider.width()/2;
var sliderH2 = $slider.height()/2;
var radius = 200;
var deg = 0;
var elP = $('#container').offset();
var elPos = { x: elP.left, y: elP.top};
var X = 0, Y = 0;
var mdown = false;
$('#container')
.mousedown(function (e) { mdown = true; })
.mouseup(function (e) { mdown = false; })
.mousemove(function (e) {
if (mdown) {
var mPos = {x: e.clientX-elPos.x, y: e.clientY-elPos.y};
var atan = Math.atan2(mPos.x-radius, mPos.y-radius);
deg = -atan/(Math.PI/180) + 180; // final (0-360 positive) degrees from mouse position
X = Math.round(radius* Math.sin(deg*Math.PI/180));
Y = Math.round(radius* -Math.cos(deg*Math.PI/180));
$slider.css({ left: X+radius-sliderW2, top: Y+radius-sliderH2 });
// AND FINALLY apply exact degrees to ball rotation
$slider.css({ WebkitTransform: 'rotate(' + deg + 'deg)'});
$slider.css({ '-moz-transform': 'rotate(' + deg + 'deg)'});
//
// PRINT DEGREES
$('#test').html('angle deg= '+deg);
}
});
})();
What i want to do it turn this into a time line control for a html5 video. However, i am having some trouble with calculating the math behind this.

Try this:
http://jsfiddle.net/phdphil/Zv4K7/#base
It works by keeping global variables for the current position and last angle (you should change this setup to construct a specific dial with its own state). Each movement then calculates the delta (modulo 360, which requires a proper modulus function) and assumes that movements of < 180 degrees are forward movements, and > 180 degrees (remember -1 modulo 360 is 359) are negative movements. This then updates the cumulative total position:
var current = 0;
var lastAngle = 0;
// ... inside the handler
var delta = 0;
var dir = 0;
var rawDelta = mod(deg-lastAngle,360.0);
if(rawDelta < 180) {
dir = 1;
delta = rawDelta;
} else {
dir = -1;
delta = rawDelta-360.0;
}
current += delta;
lastAngle = deg;
$('#test').html('angle deg= '+current); // current instead of deg
Just for clarity, the dir variable holds the direction of this movement, which could be used to update a >> or << indicator onscreen.
The real modulus function, taken from this SO answer:
function mod(x,n) {
return ((x%n)+n)%n;
}

Stop function when pressing ctrl jQuery

So I am making a little game where you have to press Ctrl to stop a div from jumping randomly.
However I can't get it working...
The jumpRandom function works fine, until i put the randomJump(){return false;}; inside the if (event.ctrlKey) {}. What should I do to get it working?
js:
$(document).ready(function() {
function randomFromTo(from, to){
return Math.floor(Math.random() * (to - from + 1) + from);
}
$( "#goal" ).bind('mouseenter keypress', function(event) {
if (event.ctrlKey) {
randomJump(){return false;};
}
});
$('#goal').mouseenter(randomJump);
function randomJump(){
/* get Window position and size
* -- access method : cPos.top and cPos.left*/
var cPos = $('#pageWrap').offset();
var cHeight = $(window).height() - $('header').height() - $('footer').height();
var cWidth = $(window).width();
// get box padding (assume all padding have same value)
var pad = parseInt($('#goal').css('padding-top').replace('px', ''));
// get movable box size
var bHeight = $('#goal').height();
var bWidth = $('#goal').width();
// set maximum position
maxY = cPos.top + cHeight - bHeight - pad;
maxX = cPos.left + cWidth - bWidth - pad;
// set minimum position
minY = cPos.top + pad;
minX = cPos.left + pad;
// set new position
newY = randomFromTo(minY, maxY);
newX = randomFromTo(minX, maxX);
$('#goal').fadeOut(50, function(){
$('#goal').fadeIn(700);
});
$('#goal').animate({
left: newX,
top: newY,
duration: 500
});
}
});

Try this:
$("#goal").bind('mouseenter keypress', function (e) {
randomJump(e);
});
function randomJump(e) {
if (!e.ctrlKey) {
//do normal stuff
} else {
//depending on how permanent you need this to be...
//$("#goal").unbind('mouseenter keypress');
}
return !e.ctrlKey;
}

random position of divs in javascript

I'm trying to make Divs to appear randomly anywhere on a webpage with javascript. So a div appears then disappears, then another div appears somewhere else on the page then disappears, then another div appears again in another random spot on the page then disappears, and so on.
I'm not sure on how to generate random units in pixels or what technique to use to generate random positions.
How do I do that? Here's my code:
var currentDivPosition = myDiv.offset(),
myDivWidth = myDiv.width(),
myDivHeight = myDiv.height(),
var myDiv = $('<div>'),
finalDivPositionTop, finalDivPositionLeft;
myDiv.attr({ id: 'myDivId', class: 'myDivClass' }); // already defined with position: absolute is CSS file.
// Set new position
finalDivPositionTop = currentDivPosition.top + Math.floor( Math.random() * 100 );
finalDivPositionLeft = currentDivPosition.left + Math.floor( Math.random() * 100 );
myDiv.css({ // Set div position
top: finalDivPositionTop,
left: finalDivPositionLeft
});
$('body').append(myDiv);
myDiv.text('My position is: ' + finalDivPositionTop + ', ' + finalDivPositionLeft);
myDiv.fadeIn(500);
setTimeout(function(){
myDiv.fadeOut(500);
myDiv.remove();
}, 3000);

Here's one way to do it. I'm randomly varying the size of the div within a fixed range, then setting the position so the object is always placed within the current window boundaries.
(function makeDiv(){
// vary size for fun
var divsize = ((Math.random()*100) + 50).toFixed();
var color = '#'+ Math.round(0xffffff * Math.random()).toString(16);
$newdiv = $('<div/>').css({
'width':divsize+'px',
'height':divsize+'px',
'background-color': color
});
// make position sensitive to size and document's width
var posx = (Math.random() * ($(document).width() - divsize)).toFixed();
var posy = (Math.random() * ($(document).height() - divsize)).toFixed();
$newdiv.css({
'position':'absolute',
'left':posx+'px',
'top':posy+'px',
'display':'none'
}).appendTo( 'body' ).fadeIn(100).delay(1000).fadeOut(500, function(){
$(this).remove();
makeDiv();
});
})();
Edit: For fun, added a random color.
Edit: Added .remove() so we don't pollute the page with old divs.
Example: http://jsfiddle.net/redler/QcUPk/8/

Let's say you have this HTML:
<div id="test">test div</div>
And this CSS:
#test {
position:absolute;
width:100px;
height:70px;
background-color:#d2fcd9;
}
Using jQuery, if you use this script, whenever you click the div, it will position itself randomly in the document:
$('#test').click(function() {
var docHeight = $(document).height(),
docWidth = $(document).width(),
$div = $('#test'),
divWidth = $div.width(),
divHeight = $div.height(),
heightMax = docHeight - divHeight,
widthMax = docWidth - divWidth;
$div.css({
left: Math.floor( Math.random() * widthMax ),
top: Math.floor( Math.random() * heightMax )
});
});
The way this works is...first you calculate the document width and height, then you calculate the div width and height, and then you subtract the div width from the document width and the div height from the document height and consider that the pixel range you're willing to put the div in (so it doesn't overflow out of the document). If you have padding and border on the div, you'll need to account for those values too. Once you've figured out the range, you can easily multiple that by Math.random() and find the random position of your div.
So once more: first find the dimensions of the container, then find the dimensions of your element, then subtract element dimensions from container dimensions, and THEN use Math.random() on that value.
The basic idea is encapsulated here:
http://jsfiddle.net/5mvKE/

Some bugs:
You missed to position the div absolutely. Otherwise it will not
work.
I think you need to ad 'px' to the numbers.
The map is made of strings
Right in your jQuery css setup:
myDiv.css({
'position' : 'absolute',
'top' : finalDivPositionTop + 'px',
'left' : finalDivPositionLeft + 'px'
});

I changed an existant code by this one for our website, you can see it on tweefox.nc
<script>
function draw() {
$(canvas).attr('width', WIDTH).attr('height',HEIGHT);
con.clearRect(0,0,WIDTH,HEIGHT);
for(var i = 0; i < pxs.length; i++) {
pxs[i].fade();
pxs[i].move();
pxs[i].draw();
}
}
function Circle() {
this.s = {ttl:8000, xmax:10, ymax:4, rmax:10, rt:1, xdef:950, ydef:425, xdrift:4, ydrift: 4, random:true, blink:true};
this.reset = function() {
this.x = (this.s.random ? WIDTH*Math.random() : this.s.xdef);
this.y = (this.s.random ? HEIGHT*Math.random() : this.s.ydef);
this.r = ((this.s.rmax-1)*Math.random()) + 1;
this.dx = (Math.random()*this.s.xmax) * (Math.random() < .5 ? -1 : 1);
this.dy = (Math.random()*this.s.ymax) * (Math.random() < .5 ? -1 : 1);
this.hl = (this.s.ttl/rint)*(this.r/this.s.rmax);
this.rt = Math.random()*this.hl;
this.s.rt = Math.random()+1;
this.stop = Math.random()*.2+.4;
this.s.xdrift *= Math.random() * (Math.random() < .5 ? -1 : 1);
this.s.ydrift *= Math.random() * (Math.random() < .5 ? -1 : 1);
}
this.fade = function() {
this.rt += this.s.rt;
}
this.draw = function() {
if(this.s.blink && (this.rt <= 0 || this.rt >= this.hl)) {
this.s.rt = this.s.rt*-1;
this.dx = (Math.random()*this.s.xmax) * (Math.random() < .5 ? -1 : 1);
this.dy = (Math.random()*this.s.ymax) * (Math.random() < .5 ? -1 : 1);
} else if(this.rt >= this.hl) this.reset();
var newo = 1-(this.rt/this.hl);
con.beginPath();
con.arc(this.x,this.y,this.r,0,Math.PI*2,true);
con.closePath();
var cr = this.r*newo;
g = con.createRadialGradient(this.x,this.y,0,this.x,this.y,(cr <= 0 ? 1 : cr));
g.addColorStop(0.0, 'rgba(255,255,255,'+newo+')');
g.addColorStop(this.stop, 'rgba(255,255,255,'+(newo*.2)+')');
g.addColorStop(1.0, 'rgba(255,255,255,0)');
con.fillStyle = g;
con.fill();
}
this.move = function() {
this.x += (this.rt/this.hl)*this.dx;
this.y += (this.rt/this.hl)*this.dy;
if(this.x > WIDTH || this.x < 0) this.dx *= -1;
if(this.y > HEIGHT || this.y < 0) this.dy *= -1;
}
this.getX = function() { return this.x; }
this.getY = function() { return this.y; }
}
$(document).ready(function(){
// if( /Android|AppleWebKit|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ) {
// } else {
if(document.getElementById('pixie')) {
WIDTH = $(window).width();
HEIGHT = $(window).height();
canvas = document.getElementById('pixie');
$(canvas).attr('width', WIDTH).attr('height',HEIGHT);
con = canvas.getContext('2d');
pxs = new Array();
rint = 60;
for(var i = 0; i < 50; i++) {
pxs[i] = new Circle();
pxs[i].reset();
}
setInterval(draw,rint);
}
// }
});
</script>