Interactive SVG-SMIL animation tutorial

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Draft

Introduction

This short tutorial will provide an introduction to adding some interactivity to dynamic SVG, ie. SVG-SMIL animation

Prerequisites:

• Using SVG with HTML5 tutorial
• Static SVG tutorial
• SVG-SMIL animation tutorial

See also:

• SVG (Short overview)
• SVG links (links to various SVG resources)

Alternative reading:

• SVG Essentials/Animating and Scripting SVG (Chapter from the Eisenberg book)

Attention: You must use a recent HTML5 compliant browser (issued 2011 or later), e.g. FireFox, Chrome, Opera or Safari. These examples will not work with Internet Explorer 9.

Simple click and mouse-over examples

SVG-SMIL allows to use user events such as a mouse click. Something like Button.click allows to refer to a click event on an SVG element that has id=Button

The following SVG code fragment is part of an HTML5 file:

 <svg style="margin-left:50px;border:1px solid blue" height="300" width="300" 
	 xmlns:xlink="http://www.w3.org/1999/xlink"
	 xmlns="http://www.w3.org/2000/svg">
  
      <g id="Button"
	 transform="translate(100,100)">
	<ellipse stroke-width="2" stroke="none" fill="yellow" ry="1cm" rx="2cm" >
	  <animate fill="freeze" dur="1s" begin="Button.click" from="1cm" to="5cm" attributeName="ry"/>
	  <animate fill="freeze" dur="1s" begin="Button.click" from="2cm" to="10cm" attributeName="rx"/>
	</ellipse>
	<text style="font-family:Arial;font-size:18;" alignment-baseline="middle" x="-1cm">Click me !</text>
      </g>      
    </svg>

Source code:

• http://tecfa.unige.ch/guides/svg/ex/mouse-over/simple-click.html
• http://tecfa.unige.ch/guides/svg/ex/mouse-over/simple-click2.html (Animation elements outside the animated element)
• http://tecfa.unige.ch/guides/svg/ex/mouse-over/simple-click3.html (Animation happens in another element)

More examples:

• http://tecfa.unige.ch/guides/svg/ex/mouse-over/

Motion animation

Example showing how to start a motion animation:

• http://tecfa.unige.ch/guides/svg/ex/smil-dom/drive-start.svg (Pure SVG)
• http://tecfa.unige.ch/guides/svg/ex/smil-dom/drive-start.html (HTML5 + SVG)

Alternative examples:

• http://srufaculty.sru.edu/david.dailey/svg/newstuff/SMIL7g.svg

Stopping / pausing animation

Pendulum example

• http://tecfa.unige.ch/guides/svg/ex/smil-dom/pendula.svg
• http://tecfa.unige.ch/guides/svg/ex/smil-dom/pendula.html (HTML5 variant, Javascript code is a bit different)

<source lang="XML" enclose="div"> <?xml version="1.0" ?>

<svg xmlns="http://www.w3.org/2000/svg" version="1.0"

    viewBox="0 0 300 200">

<script>

 function stop () {
  document.documentElement.pauseAnimations();
 }

 function start () {
  document.documentElement.unpauseAnimations();
 }

</script> <desc>

 The pendulum code was taken from http://www.treebuilder.de/xul/svg2apng/pendel.svg. The pauseAnimations method is documented in the SVG 1.1 spec: http://www.w3.org/TR/SVG/struct.html#__svg__SVGSVGElement__pauseAnimations
</desc>

<g> <line x1="100" y1="0" x2="100" y2="90" stroke="black"/> <circle cx="100" cy="90" r="10"/> <animateTransform attributeName="transform" type="rotate"

   values="0,100,0;70,100,0;0,100,0;-70,100,0;0,100,0" 
   keySplines="0,0.5,0.5,1;0.5,0,1,0.5;0,0.5,0.5,1;0.5,0,1,0.5" 
   calcMode="spline" begin="0s" dur="4s" repeatCount="indefinite"/>

</g>

<g onclick="stop()" transform="translate(150 0)"> <rect width="50" height="30" rx="10" stroke="black" fill-opacity="0.2"/> <text id="t" style="font:16px Arial Black;fill:white;stroke:black" transform="translate(5 20)">STOP</text> </g>

<g onclick="start()" transform="translate(5 0)"> <rect width="50" height="30" rx="10" stroke="black" fill-opacity="0.2"/> <text id="t" style="font:16px Arial Black;fill:white;stroke:black" transform="translate(2 20)">START</text> </g>

</svg>