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HTML

              
                <head>
	
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width">
	<title>SVG Animation with Snap.svg</title>
   
</head>

<body>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/snap.svg/0.5.1/snap.svg-min.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
    <script src="./wrDisplay_01.js"></script>
<script>


$(document).ready(function() {
    console.log("Ready!");
    loadSVGAnimation();
});


</script>
<!-- Note: 
        Using CSS to change width and height works with Chrome but not with Firfox 
        For Details:  https://stackoverflow.com/questions/36363285/setting-svg-element-width-height-attributes-using-css-in-firefox
 "  -->
 <svg id="svgCanvas" width="535" height="280" viewBox="0 0 535 280"  preserveAspectRatio="xMinYMin meet" xmlns="http://www.w3.org/2000/svg">
  
    <defs>
    <linearGradient id="button_surface1" gradientUnits="objectBoundingBox"
      x1="1" x2="1" y1="0" y2="1">
      <stop stop-color="#808080" offset="0"/>
      <stop stop-color="#DDDDDD" offset="0.67"/>
    </linearGradient>
    
   <linearGradient id="button_surface2" gradientUnits="objectBoundingBox"
      x1="1" x2="1" y1="0" y2="1">
      <stop stop-color="#00009F" offset="0"/>
      <stop stop-color="#0000FF" offset="0.67"/>
    </linearGradient>
    
    <filter id="virtual_light" filterUnits="objectBoundingBox"
      x="-0.1" y="-0.1" width="1.2" height="1.2">
      <feGaussianBlur in="SourceAlpha" stdDeviation="2" result="alpha_blur"/>

      <!-- virtual shadow effect -->
      <feOffset in="alpha_blur" dx="4" dy="4" result="offset_alpha_blur"/>

      <!-- vitual lighting effect -->
      <feSpecularLighting in="alpha_blur" surfaceScale="5" specularConstant="1"
        specularExponent="20" lighting-color="#FFFFFF" result="spec_light">
        <fePointLight x="-5000" y="-10000" z="10000"/>
      </feSpecularLighting>
      <feComposite in="spec_light" in2="SourceAlpha" operator="in"
        result="spec_light"/>
      <feComposite in="SourceGraphic" in2="spec_light"
        operator="out" result="spec_light_fill"/>

      <!-- combine effects -->
      <feMerge>
        <feMergeNode in="offset_alpha_blur"/>
        <feMergeNode in="spec_light_fill"/>
      </feMerge>
    </filter>
  </defs>

  <!-- button content -->
   <rect id="svgRect0" x="5" y="5" rx="15" ry="15" width="520" height="260" fill="url(#button_surface1)" stroke="#360000" filter="url(#virtual_light)"  />
   	
  <g id="svgGroup1">  
  	 <text id="svgTextHeadlineG1"  x="15" y="30" font-size="20px" font-family="Tahoma" font-weight="500"  fill="black"  >PV Igensdorf [99 kWh] </text>

  	<rect id="svgRect1G1" x="10" y="40" rx="15" ry="15" width="100" height="60"  fill="url(#button_surface2)" stroke="#360000" filter="url(#virtual_light)"/>
  	<rect id="svgRect2G1" x="120" y="40" rx="15" ry="15" width="100" height="60"  fill="url(#button_surface2)" stroke="#360000" filter="url(#virtual_light)"/>
  	<rect id="svgRect3G1" x="230" y="40" rx="15" ry="15" width="100" height="60"  fill="url(#button_surface2)" stroke="#360000" filter="url(#virtual_light)"/>
  	<rect id="svgRect4G1" x="340" y="40" rx="15" ry="15" width="100" height="60"  fill="url(#button_surface2)" stroke="#360000" filter="url(#virtual_light)"/>
 
  	<text id="svgText1HeaderG1" x="20" y="60" font-size="11px" font-family="Tahoma" font-weight="400" fill="white"  >Tages-Produktion:</text>
  	<text id="svgText1G1"       x="60" y="90" font-size="20px" font-family="Tahoma" font-weight="500"  fill="white"  text-anchor="middle"> -- kWh </text>
  
  	<text id="svgText2HeaderG1" x="130" y="60" font-size="11px" font-family="Tahoma" font-weight="400" fill="white">Akuelle Leistung: </text>      
  	<text id="svgText2G1"       x="175" y="90" font-size="20px" font-family="Tahoma" font-weight="500"  fill="white" text-anchor="middle"> -- kWh </text>
  
  	<text id="svgText3HeaderG1" x="245" y="60" font-size="13px" font-family="Tahoma" font-weight="600" fill="white" >[kWh/kWp]</text>      
  	<text id="svgText3G1"       x="280" y="90" font-size="20px" font-family="Tahoma" font-weight="500" fill="white" text-anchor="middle">0.0</text>  
    
  	<text id="svgText4HeaderG1" x="355" y="60" font-size="13px" font-family="Tahoma" font-weight="600"  fill="white">[kW/kWp]</text>      
  	<text id="svgText4G1"       x="395" y="90" font-size="20px" font-family="Tahoma" font-weight="500" fill="white" text-anchor="middle">0.0</text>  

  	<image id="svgTrafficLightImgG1" x="455" y="35" width="70" height="80px" href="images/tlight_green.gif"/>
  </g> 
  <g id="svgGroup2">  
  	<text id="svgTextHeadlineG2"  x="20" y="145" font-size="20px" font-family="Tahoma" font-weight="500"  fill="black"  >PV Sattelmannsburg I [4,7 kWh] </text>  
    <rect id="svgRect1G2" x="15"  y="155" rx="15" ry="15" width="100" height="60"  fill="url(#button_surface2)" stroke="#360000" filter="url(#virtual_light)"/>
    <rect id="svgRect2G2" x="125" y="155" rx="15" ry="15" width="100" height="60"  fill="url(#button_surface2)" stroke="#360000" filter="url(#virtual_light)"/>
    <rect id="svgRect3G2" x="235" y="155" rx="15" ry="15" width="100" height="60"  fill="url(#button_surface2)" stroke="#360000" filter="url(#virtual_light)"/>
    <rect id="svgRect4G2" x="345" y="155" rx="15" ry="15" width="100" height="60"  fill="url(#button_surface2)" stroke="#360000" filter="url(#virtual_light)"/>
   
    <text id="svgText1HeaderG2" x="20" y="175" font-size="11px" font-family="Tahoma" font-weight="400" fill="white"  >Tages-Produktion:</text>
  	<text id="svgText1G2"       x="60" y="205" font-size="20px" font-family="Tahoma" font-weight="500"  fill="white"  text-anchor="middle"> -- kWh </text>
  
  	<text id="svgText2HeaderG2" x="130" y="175" font-size="11px" font-family="Tahoma" font-weight="400" fill="white">Akuelle Leistung: </text>      
  	<text id="svgText2G2"       x="175" y="205" font-size="20px" font-family="Tahoma" font-weight="500"  fill="white" text-anchor="middle"> -- kWh </text>
  
  	<text id="svgText3HeaderG2" x="245" y="175" font-size="13px" font-family="Tahoma" font-weight="600" fill="white" >[kWh/kWp]</text>      
  	<text id="svgText3G2"       x="280" y="205" font-size="20px" font-family="Tahoma" font-weight="500" fill="white" text-anchor="middle">0.0</text>  
    
  	<text id="svgText4HeaderG2" x="355" y="175" font-size="13px" font-family="Tahoma" font-weight="600"  fill="white">[kW/kWp]</text>      
  	<text id="svgText4G2"       x="395" y="205" font-size="20px" font-family="Tahoma" font-weight="500" fill="white" text-anchor="middle">0.0</text> 
    
    <image id="svgTrafficLightImgG2" x="455" y="150" width="70" height="80px" href="images/tlight_green.gif"/>

  </g> 
  
         	 	
</svg>
 
</body>
              
            
!

CSS

              
                 h1{ text-align:center; }
    a { text-align:center;
    	display: block;  }
	svg {
    	display: block;
    	margin: 0 auto;
    	background-color: "#9e9e9e1a";
	}
	
              
            
!

JS

              
                "use strict";

function loadSVGAnimation() {
	try {
        animateDisplay();
	} catch (e) { 
		console.log("loadSVGAnimation Failed " + e);
		throw e;   
	}
}

function updatePanelMode1(sel, addInfo, val) {
	var htmlSelector = sel;
	var addText = addInfo;
	var svgTextElement = null;
	var actVal = val;
	var panelTxt = "";

	svgTextElement =  Snap.select(htmlSelector);
	panelTxt = actVal + " " + addText;
	svgTextElement.node.innerHTML = panelTxt;
	return svgTextElement;
}

function updatePanelMode2(sel, aPower, mPower ) {
	var htmlSelector = sel;
	var maxPower = mPower;
	var actPower = aPower;
	var svgTextElement = null;
	var n = 0.0;
	var panelTxt = "";

	svgTextElement =  Snap.select(htmlSelector);
	n = (actPower/maxPower).toFixed(2);
	panelTxt = n;
	svgTextElement.node.innerHTML = panelTxt;
	return n;
}

function updateTrafficLight(sel, aPower, tlightImage ) {
    var htmlSelector = sel;
    var actPowerProKW = aPower;
    var tlight ="";
    var svgTrafficLight = Snap.select(sel);
	if (actPowerProKW <= 0.3 ) {
		tlight="tlight_red.gif";
	} else if ( actPowerProKW >= 0.3 && actPowerProKW <= 0.5 ) {
		tlight="tlight_yellow.gif";
	} else {
		tlight="tlight_green.gif";
	}
	var elem =document.getElementById(tlightImage);
	elem.href.baseVal=('http:/pvlocal.de/test/images/' + tlight );
}

function animateDisplay() {
	animateGroup("G1");
	animateGroup("G2");
	setTimeout(animateDisplay, 3000);
}

function  animateGroup(g) {
	var groupID = g;
	var txt1 = "---";
	var txt2 = "---";
	var txt3 = "0.0";
	var txt4 = "0.0";
	var tlight="tlight_yellow.gif";
	var svgTextElement1 = null;
	var svgTextElement2 = null;
	var svgTextElement3 = null;
	var svgTextElement4 = null;
	var svgTrafficLight = null;
	var maxFountSize=22;
	var timing = 1500;
	var actDayPower, actPower, actDayPowerProKW, actPowerProKW;
	actPower = actDayPowerProKW = actPowerProKW = 0.0;
	var htmlSelector1 = "#svgText1" + groupID;
	var htmlSelector2 = "#svgText2" + groupID;
	var htmlSelector3 = "#svgText3" + groupID;
	var htmlSelector4 = "#svgText4" + groupID;
	var htmlSelectTL =   "#svgTrafficLight" + groupID;
	var htmlSelectTLImage =   "svgTrafficLightImg" + groupID;
	var maxPower = 90; // kWP

	actDayPower = Math.floor((Math.random() * 999) + 1);
	svgTextElement1 = updatePanelMode1(htmlSelector1,"kWh", actDayPower);

	actPower = Math.floor((Math.random() * 100) + 1);
	svgTextElement2 = updatePanelMode1(htmlSelector2, "kW", actPower);

	actDayPowerProKW = updatePanelMode2(htmlSelector3, actDayPower, maxPower);
	svgTextElement3 =  Snap.select(htmlSelector3);

	actPowerProKW = updatePanelMode2(htmlSelector4, actPower, maxPower);
	svgTextElement4 =  Snap.select(htmlSelector4);

	updateTrafficLight(htmlSelectTL, actPowerProKW, htmlSelectTLImage);

	Snap.animate( 0, 1, function( value ) {
                    //svgTextElement.transform('s' + value   );                              // Animate by transform
		svgTextElement1.attr({ 'font-size': value * maxFountSize ,  opacity: value });      // Animate by font-size 
		svgTextElement2.attr({ 'font-size': value * maxFountSize,  opacity: value });       // and opacity !
		svgTextElement3.attr({ 'font-size': value * maxFountSize,  opacity: value });
    }, timing, mina.bounce, function() {  } );     
	
}


              
            
!
999px

Console