How to animate clipping paths defined in SVG elements?

user_10590182 0
Viewed 3372

I know how to animate a clip-path defined directly in CSS, but I don't understand how to do it when the clip-path is referenced from an SVG clipPath element.

I have been experimenting with simple clip-path animations using just CSS, until I realized you can't define a compound-path as a clip-path directly there, so I turned to SVG's clipPath which allows defining multiple paths. But then the animation doesn't work, that is, there is no smooth transition.

Here is what I'm trying...

HTML

<svg>
    <defs>
        <clipPath id="shape--start">
            <polygon points="0,100 22.222,133.333 8.333,147.222 -13.889,113.889 -47.222,91.667 -33.333,77.778"/>
        </clipPath>
        <clipPath id="shape--end">
            <polygon points="144.444,-44.444 166.667,-11.111 152.778,2.778 130.556,-30.556 97.222,-52.778 111.111,-66.667"/>
        </clipPath>
    </defs>
</svg>

CSS

@keyframes shape {
    0% { clip-path: url(#shape--start) }
    100% { clip-path: url(#shape--end) }
}

To clarify more, if I use something like

CSS

@keyframes shape {
    0% { clip-path: polygon(-44% 5%, -14% 5%, 15% 95%, -15% 95%) }
    100% { clip-path: polygon(90% 5%, 120% 5%, 149% 95%, 119% 95%) }
}

it works as expected, but I would like to use SVG for the more complex compound paths.

Thanks for your time and any help in advance!

clip-path css-animations svg css html
2 Answers

You need to animate the SVG itself using animate

.box {
  width:300px;
  height:200px;
  background:red;
  clip-path: url(#shape--start);
}
<svg width=0 height=0>
    <defs>
        <clipPath id="shape--start">
            <polygon points="0,100 22.222,133.333 8.333,147.222 -13.889,113.889 -47.222,91.667 -33.333,77.778">
            <animate attributeType="XML" attributeName="points" 
            from="0,100 22.222,133.333 8.333,147.222 -13.889,113.889 -47.222,91.667 -33.333,77.778" 
            to="144.444,-44.444 166.667,-11.111 152.778,2.778 130.556,-30.556 97.222,-52.778 111.111,-66.667"
          dur="2s" repeatCount="indefinite"/>
            </polygon>
        </clipPath>
    </defs>
</svg>
<div class="box">

</div>

user_86203330

Animation option using animateTransform 

.box {
  width:300px;
  height:200px;
  background:red;
  clip-path: url(#shape--start);
}
<svg width="0" height="0">
    <defs>
        <clipPath id="shape--start">
            <polygon points="0,100 22.222,133.333 8.333,147.222 -13.889,113.889 -47.222,91.667 -33.333,77.778">
            <animateTransform attributeType="XML" attributeName="transform" type="translate" 
            values="0,100;144.444,-44.444"
          dur="2s" repeatCount="indefinite"/>
            </polygon>
        </clipPath>
    </defs>
</svg>
<div class="box">

</div>

Roundtrip animation

 .box {
  width:300px;
  height:200px;
  background:red;
  clip-path: url(#shape--start);
}
<svg width="0" height="0">
    <defs>
        <clipPath id="shape--start">
            <polygon points="0,100 22.222,133.333 8.333,147.222 -13.889,113.889 -47.222,91.667 -33.333,77.778">
            <animateTransform attributeType="XML" attributeName="transform" type="translate" 
            values="0,100;144.444,-44.444;0,100"
          dur="2s" repeatCount="indefinite"/>
            </polygon>
        </clipPath>
    </defs>
</svg>
<div class="box">

</div>

user_73948710
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