I'm currently working on a project to develop a feature on a website that crops an image to show only a portion of it while spinning.
The image consists of arrows pointing in various directions and I want it to rotate smoothly.
I'm currently working on a project to develop a feature on a website that crops an image to show only a portion of it while spinning.
The image consists of arrows pointing in various directions and I want it to rotate smoothly.
Presented here is a straightforward code snippet specifically for resizing images on the client side.
function resizeAndUpload(file) {
var reader = new FileReader();
reader.onloadend = function() {
var tempImg = new Image();
tempImg.src = reader.result;
tempImg.onload = function() {
var MAX_WIDTH = 400;
var MAX_HEIGHT = 300;
var tempW = tempImg.width;
var tempH = tempImg.height;
if (tempW > tempH) {
if (tempW > MAX_WIDTH) {
tempH *= MAX_WIDTH / tempW;
tempW = MAX_WIDTH;
}
} else {
if (tempH > MAX_HEIGHT) {
tempW *= MAX_HEIGHT / tempH;
tempH = MAX_HEIGHT;
}
}
var canvas = document.createElement('canvas');
canvas.width = tempW;
canvas.height = tempH;
var ctx = canvas.getContext("2d");
ctx.drawImage(this, 0, 0, tempW, tempH);
var dataURL = canvas.toDataURL("image/jpeg");
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function(ev){
document.getElementById('filesInfo').innerHTML = 'Done!';
};
xhr.open('POST', 'uploadResized.php', true);
xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
var data = 'image=' + dataURL;
xhr.send(data);
}
}
reader.readAsDataURL(file);
}
Source -
For more advanced options, consider utilizing pre-existing jQuery image plugins.
Source -
To contain the image within a smaller area, you can create a div with CSS overflow:hidden property. Take a look at this demonstration: http://jsfiddle.net/Nillervision/CBsLj/3/
#parentDiv{
width:200px;
height:200px;
border:1px solid black;
overflow:hidden;
}
#theImage{
margin-top:-100px;
margin-left:-100px;
width:400px;
height:400px;
display:block;
-webkit-animation: rotAnim linear 5s infinite;
animation: rotAnim linear 5s infinite;
}
@-webkit-keyframes rotAnim {
from {
-webkit-transform: rotate(0deg);
}
to {
-webkit-transform: rotate(360deg);
}
}
@keyframes rotAnim {
from {
transform: rotate(0deg);
}
to {
transform: rotate(360deg);
}
}
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