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9
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1 <script type="text/ecmascript">
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2 <![CDATA[
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3 addEventListener('DOMMouseScroll', wheel, false);
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4 onmousewheel = wheel;
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5 var svgEl = document.getElementById("topsvg");
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6 var startx=0;
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7 var starty=0;
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8 function wheel(evt){
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9 evt = evt ? evt : window.event;
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10 var normal = evt.detail ? evt.detail * -1 : evt.wheelDelta / 40;
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11 var vb = new Array(4);
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12 var vbtext = svgEl.getAttributeNS(null,"viewBox");
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13 vb = vbtext.split(" ");
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14 var zoom = (normal<0)? 1.41 : 0.71;
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15 //var dwidth = parseFloat(Math.max(vb[2],vb[3])) * (1-zoom);
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16 vb[0] = parseFloat(vb[0]) + parseFloat(vb[2])*(1-zoom) * evt.clientX/innerWidth;
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17 vb[1] = parseFloat(vb[1]) + parseFloat(vb[3])*(1-zoom) * evt.clientY/innerHeight;
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18 vb[2] = parseFloat(vb[2]) * zoom;
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19 vb[3] = parseFloat(vb[3]) * zoom;
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20 svgEl.setAttributeNS(null, "viewBox", vb.join(" "));
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21 }
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22 onmousedown = function(evt) {
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23 startx = evt.clientX;
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24 starty = evt.clientY;
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25 }
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26 onmousemove=function(evt) {
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27 if(startx!=0 && starty!=0
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28 && ((evt.clientX - startx)*(evt.clientX - startx)+(evt.clientY - starty)*(evt.clientY - starty)>100))
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29 {
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30 var vbtext = svgEl.getAttributeNS(null,"viewBox");
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31 vb = vbtext.split(" ");
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32 var maxwh = Math.max(parseFloat(vb[2]),parseFloat(vb[3]));
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33 vb[0] = parseFloat(vb[0]) - (evt.clientX - startx)*maxwh/innerWidth;
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34 vb[1] = parseFloat(vb[1]) - (evt.clientY - starty)*maxwh/innerHeight;
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35 svgEl.setAttributeNS(null, "viewBox", vb.join(" "));
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36 startx = evt.clientX;
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37 starty = evt.clientY;
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38 }
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39 }
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40 onmouseup=function() {
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41 startx=0;
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42 starty=0;
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43 }
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44 ]]>
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45 </script>
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