Rotate rectangle around its own center in SVG

I have following piece of code :

<svg>

<defs>
<rect id = "myRect"
      x = "10"
      y = "10"
      height = "120"
      width = "120"
      stroke-width = "2px"
      stroke = "red"
      fill = "blue" />

</defs>


<g transform = "translate(100,30)">
  <use xlink:href = "#myRect" />
</g>

<g transform = "translate(100, 100) rotate(45 ? ?)">

  <rect id = "myRect"
      x = "10"
      y = "10"
      height = "120"
      width = "120"
      stroke-width = "2px"
      stroke = "green"
      fill = "yellow" />
</g>

</svg>

When I translate rectangle without rotation, it is working fine. But when I rotate it, I wanted to rotate it around its center axis point. What should I need to pass to rotate attribute?

You would have to set the center as the center of the filled element. Like this:

svg .rotate {
  transform-box: fill-box;
  transform-origin: center;
  transform: rotate(45deg);
}

You just need to add half the width/height of the rectangle to get its centre.

<g transform = "translate(100, 100) rotate(45 60 60)">

See transform documentation of the rotate function for more information.

The accepted answer works if you are drawing the rectangle starting at point (0,0) which was the OP case. However for me it was not!

Here is what worked for me:

• To get the rectangle coordinates i used $('#rectID').getBBox() method, should return [rect-height , rect-width , rect-y , rect x ]
• The center point is ( rect-x + (rect-width/2) , rect-y + (rect-height/2) )

Here is a snippet i used on the browser console:

var coord = $('#elemID')[0].getBBox();
coord.x + (coord.width/2) +' '+ coord.y + (coord.height/2)

origin
x = x + width / 2
y = y + height / 2
here
x is 10
y is 10
width is 120
height is 120

<g transform = "translate(100, 100) rotate(45 70 70)">

I know this is an old post but if there are people out there who are looking make the values modifiable outside the group element

    const centerX=100;
    const centerY=100;
    const firstAngle=45;
    const secondAngle=60;
    const thirdAngle =60;
  
    <g transform ={`translate(${centerX}, ${centerY}) rotate(${firstAngle} ${secondAngle}, 
    ${thirdAngle})`}>

Nothing you just need to write the following code with the element in javascript:

element.rotate(angle Degree);