CSS rotation – result overview
Is it possible or not? And how? Sometimes, ordinary webdesigner asking himself this question. And here – he can faced with some difficulties. In fact, different browsers still don`t have defined css rules which we can use to rotate html elements. And, they provide us with own custom css styles for each browser. So in result – we should combine different methods, styles to get it to work cross-browser. Today I will tell what we can use for different browsers.
Mozilla Firefox
As example – we need to rotate some element for 45 degrees. For this browser we can use next styles (we will use mozilla – related styles with prefix ‘-moz’ and webkit):
-moz-transform:rotate(45deg); -webkit-transform:rotate(45deg);
One note, it seems that these styles working only in latests mozilla versions (4.x and upper)
Opera
For Opera we can use next styles (as you noticed – opera have own prefix ‘-o’):
-o-transform:rotate(45deg);
And again, this will available only for Opera version 10.50 and above.
Internet Explorer
Starting from IE version 9 (and above) we can use next styles (again – new prefix – ‘-ms’):
-ms-transform:rotate(45deg);
In older version of IE this is possible too, but using another ways – via filters.
Method 1 – using DXImageTransform.Microsoft.BasicImage.
filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=1);
Here – rotation not mean value of angle, this property accept four values: 0 mean 0 degrees, 1 mean 90 degrees, 2 – 180 and 3 – 270 degrees. So we can`t set own custom angle in 45 degrees, but, look to method 2
Method 2 – using DXImageTransform.Microsoft.Matrix.
This is a little more difficult way, and we will use JavaScript to set necessary values for our Matrix. Here are sample of this JS:
var rad = (45 * Math.PI) / 180.0, //preparing filter values cos = Math.cos(rad), sin = Math.sin(rad); var filter='progid:DXImageTransform.Microsoft.Matrix(sizingMethod="auto expand", M11 = ' + cos + ', M12 = ' + (-sin) + ', M21 = ' + sin + ', M22 = ' + cos + ')'; var elem = document.getElementById('my_image1'); // our destination object elem.style.filter = filter;
Where 45 in first line – our angle. So in result we will have:
And here you can see how it working in action (if we will loop rotation with step in 1 degree):
Not perfect, right? And all just because object rotating over top-left corner, not from center of object. We will need to modify script a little – apply custom margins too, something like that:
Its source code:
<img src="image.gif" id="sample3" />
var elem3 = document.getElementById('sample3'); // remember initial sizes var sizeopt={ w:elem3.width, h:elem3.height }; var angle=0; setInterval(function(){ angle+=1; //preparing filter values var rad = (angle * Math.PI) / 180.0, cos = Math.cos(rad), sin = Math.sin(rad); var filter='progid:DXImageTransform.Microsoft.Matrix(sizingMethod="auto expand", M11 = ' + cos + ', M12 = ' + (-sin) + ', M21 = ' + sin + ', M22 = ' + cos + ')'; var text="-ms-filter:"+filter+";filter:"+filter+";"; elem3.style.cssText=text; // apply filter var w=elem3.width; // obtain element sizes again var h=elem3.height; elem3.style.marginLeft=-Math.round((w-sizeopt.w)/2); // apply margins elem3.style.marginTop=-Math.round((h-sizeopt.h)/2); },40);
After all, I made result of rotated object which should supported by most of known browsers:
Its code (CSS + JS):
#sample4 { -moz-transform:rotate(45deg); -webkit-transform:rotate(45deg); -o-transform:rotate(45deg); -ms-transform:rotate(45deg); }
var rad = (45 * Math.PI) / 180.0, cos = Math.cos(rad), sin = Math.sin(rad); var filter='progid:DXImageTransform.Microsoft.Matrix(sizingMethod="auto expand", M11 = ' + cos + ', M12 = ' + (-sin) + ', M21 = ' + sin + ', M22 = ' + cos + ')'; var elem4 = document.getElementById('sample4'); elem4.style.filter = filter;
Conclusion
I hope that our overview was interesting and useful for you. Good luck!