使SVG变换矩阵绕其中心旋转 [英] Make a SVG transform matrix rotate around its center

问题描述

HTML

<rect id="red" style="fill: red;" height="100" width="20"></rect>

JS

var layer = 
{  
    sizeReal   : { "width": 20, "height": 100 }                   
,   sizeScaled : { "width": 10, "height": 50 }
,   position   : { "x": 200, "y": 200 } 

,   scale      : 0.5
,   rotation   : 0
,   matrix     : [ 1, 0, 0, 1, 0, 0 ]
};

// Not sure if its the cleanest way but it works it rotates itself arounds its center.
//
$("#red")[0].setAttribute( 'transform', 'translate(' + layer.position.x + ',' + layer.position.y +') rotate(' + layer.rotation +',' + ( layer.sizeScaled.width  / 2 ) + ',' + ( layer.sizeScaled.height / 2 ) + ') scale(' + layer.scale + ',' + layer.scale +')' ) 

现在我只想对矩阵做同样的事情.我正在使用西尔维斯特(Sylvester)将矩阵相乘.

Now i want to do the same only with a matrix. I'm using sylvester to multiply the matrixes.

我摆弄一个小提琴来弄清楚这个问题:)

I made a fiddle to make the question clear :)

http://jsfiddle.net/xYsHZ/3/

我希望红色矩形的行为与绿色矩形相同.我在做什么错了?

I want the red rect to behave the same as the green rect. What am i doing wrong?

推荐答案

已修复！矩阵元素的顺序是错误的:)

Fixed!! the sequence of the matrix elements was wrong :)

$("#red")[0].setAttribute( 'transform', 'matrix(' + layer.matrix[ 0 ][ 0 ] + ',' + layer.matrix[ 1 ][ 0 ] + ',' + layer.matrix[ 0 ][ 1 ] + ',' + layer.matrix[ 1 ][ 1 ] + ',' + layer.matrix[ 0 ][ 2 ] + ',' + layer.matrix[ 1 ][ 2 ] + ')' );
},50);

http://jsfiddle.net/6DR3D/2/

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