Create a cross-browser mixin for transform: rotate

Question

I want to create a mixin for sass that will apply a rotation to the specified element. The mixin should take one parameter, for the number of degrees of rotation to apply.

From css3please.com, I found a cross-browser way to implement this with CSS:

.box_rotate {
     -moz-transform: rotate(7.5deg);  /* FF3.5+ */
       -o-transform: rotate(7.5deg);  /* Opera 10.5 */
  -webkit-transform: rotate(7.5deg);  /* Saf3.1+, Chrome */
      -ms-transform: rotate(7.5deg);  /* IE9 */
          transform: rotate(7.5deg);  
             filter: progid:DXImageTransform.Microsoft.Matrix(/* IE6–IE9  */
                     M11=0.9914448613738104, M12=-0.13052619222005157,M21=0.13052619222005157, M22=0.9914448613738104, sizingMethod='auto expand');
               zoom: 1;
}

This is all very easy to make a mixin for, except for the pesky IE matrix notation. Does anyone have any suggestions for a way to transform the degrees into the IE matrix transformation using sass, javascript, or a combo of both?

Answer 1

There you go:

SASS:

@mixin rotate( $degrees )
  -webkit-transform: rotate(#{$degrees}deg)
  -moz-transform: rotate(#{$degrees}deg)
  -ms-transform: rotate(#{$degrees}deg)
  -o-transform: rotate(#{$degrees}deg)
  transform: rotate(#{$degrees}deg)

  filter:  progid:DXImageTransform.Microsoft.Matrix(sizingMethod='auto expand', M11=#{cos($degrees)}, M12=-#{sin($degrees)}, M21=#{sin($degrees)}, M22=#{cos($degrees)})
  -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(sizingMethod='auto expand', M11=#{cos($degrees)}, M12=-#{sin($degrees)}, M21=#{sin($degrees)}, M22=#{cos($degrees)})"
  zoom: 1

SCSS:

@mixin rotate( $degrees ) {
  -webkit-transform: rotate(#{$degrees}deg);
  -moz-transform: rotate(#{$degrees}deg);
  -ms-transform: rotate(#{$degrees}deg);
  -o-transform: rotate(#{$degrees}deg);
  transform: rotate(#{$degrees}deg);

  filter:  progid:DXImageTransform.Microsoft.Matrix(sizingMethod='auto expand', M11=#{cos($degrees)}, M12=-#{sin($degrees)}, M21=#{sin($degrees)}, M22=#{cos($degrees)});
  -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(sizingMethod='auto expand', M11=#{cos($degrees)}, M12=-#{sin($degrees)}, M21=#{sin($degrees)}, M22=#{cos($degrees)})";
  zoom: 1;
 }

usage:

@include rotate( 24 )

or you could simply use compass and make your life a lot easier :P

Answer 2

The rotation matrix is defined as

[[cos(A), -sin(A)],
 [sin(A),  cos(A)]]

where A is the angle. M11 in the IE matrix is the first element of the first row; M12 : the second element of the first row etc.

JavaScripts Math.sin and Math.cos operate on radians so you will have to turn your degrees into radians

radians = degrees * Math.PI / 180

Putting this together we get this function:

function rotationMatrix(degrees) {
  var A = degrees * Math.PI / 180;
  return [[Math.cos(A), -Math.sin(A)], [Math.sin(A),  Math.cos(A)]]
}

Example:

rotationMatrix(10) 
// => [[0.984807753012208, -0.17364817766693033], 
//     [0.17364817766693033, 0.984807753012208]]

Answer 3

This function allows to transform the degrees into IE matrix transformation.

//deg input defines the requested angle of rotation.
function degreeToIEMatrix(deg){   
    var deg2radians = Math.PI * 2 / 360;
    var rad = deg * deg2radians ;
    var costheta = Math.cos(rad);
    var sintheta = Math.sin(rad);

    var M11 = costheta;
    var M12 = -sintheta;
    var M21 = sintheta;
    var M22 = costheta;
}

You will find more informations here .

Answer 4

Here is a version of @Remy's code suitable for use in the javascript console. Just paste it into your console, then try makeIErotate(270), and it'll spit out cross-browser styles ready to paste into your CSS file.

BEWARE: the anti-aliasing in IE is ugly unless you have a solid background colour- even then it can be pretty blurry. More here .

function makeIErotate(deg) {    
    var deg2radians = Math.PI * 2 / 360;
    var rad = deg * deg2radians ;
    var costheta = Math.cos(rad);
    var sintheta = Math.sin(rad);
    return "-moz-transform: rotate(" + deg + "deg);\n\
            -o-transform: rotate(" + deg + "deg);\n\
            -webkit-transform: rotate(" + deg + "deg);\n\
            -ms-transform: rotate(" + deg + "deg);\n\
            transform: rotate(" + deg + "deg);\n\
            filter: progid:DXImageTransform.Microsoft.Matrix(\n\
                    M11=" + costheta + ",\n\
                    M12=" + -sintheta + ",\n\
                    M21=" + sintheta + ",\n\
                    M22=" + costheta + ", sizingMethod='auto expand');";
}

Answer 5

要使用mixin，你应该使用

@include rotate(24)