1

SVG animateTransform not working same as the css3 transform. 

svg.truck {
  overflow: visible;
}
.smoke{
  transform-origin: 50% 50%;
  animation: smoke 1.5s infinite ease-out;
}
@keyframes smoke {
  from {transform: translate(0, 5px) scale(1, 1);}
  to { transform: translate(40px, 10px) scale(4, 4);}
}
<svg class='truck' height='53' viewBox='0 0 93 53' width='93' xmlns='http://www.w3.org/2000/svg'>
  <g>
    <circle cx='90' cy='35' fill='#000' r='2.5'>
      <animateTransform attributeName='transform' attributeType='XML' dur='1.5s' from='1' repeatCount='indefinite' to='4' type='scale'></animateTransform>
      <animateTransform additive='sum' attributeName='transform' attributeType='XML' dur='1.5s' from='0, 5' repeatCount='indefinite' to='40,10' type='translate'></animateTransform>
    </circle>
  </g>
</svg>
<hr>
<svg class='truck' height='53' viewBox='0 0 93 53' width='93' xmlns='http://www.w3.org/2000/svg'>
  <g class='smoke-group'>
    <circle class='smoke' cx='90' cy='35' fill='#000' r='2.5' />
  </g>
</svg>
Mo.
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1 Answers1

2

The problem is that SVG animations don't have the ability to set transform-origin like you can with CSS. So the scale transform is affecting the position as well as the size.

The simplest solution is put the circle at the origin and resposition it with the parent group element.

Also, to match the CSS, you need to switch the order of your <animateTransform> elements.

svg.truck {
  overflow: visible;
}
.smoke{
  transform-origin: 50% 50%;
  animation: smoke 1.5s infinite ease-out;
}
@keyframes smoke {
  from {transform: translate(0, 5px) scale(1, 1);}
  to { transform: translate(40px, 10px) scale(4, 4);}
}
<svg class='truck' height='53' viewBox='0 0 93 53' width='93' xmlns='http://www.w3.org/2000/svg'>
  <g transform="translate(90,35)">
    <circle cx='0' cy='0' fill='#000' r='2.5'>
      <animateTransform attributeName='transform' attributeType='XML' dur='1.5s' from='0, 5' repeatCount='indefinite' to='40,10' type='translate'></animateTransform>
      <animateTransform additive='sum' attributeName='transform' attributeType='XML' dur='1.5s' from='1' repeatCount='indefinite' to='4' type='scale'></animateTransform>
    </circle>
  </g>
</svg>
<hr>
<svg class='truck' height='53' viewBox='0 0 93 53' width='93' xmlns='http://www.w3.org/2000/svg'>
  <g class='smoke-group'>
    <circle class='smoke' cx='90' cy='35' fill='#000' r='2.5' />
  </g>
</svg>
Paul LeBeau
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  • Does this kind of solution work for `transform rotate` ? – Mo. Dec 16 '15 at 12:35
  • It should. Although rotate is unique in that you can optionally provide the centre of rotation in addition to the angle. For example `` – Paul LeBeau Dec 16 '15 at 12:41
  • Could you have a look this question ? http://stackoverflow.com/questions/34153201/transform-origin-not-working-in-firefox-browser-even-properites-in-percentage-va – Mo. Dec 16 '15 at 13:02