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-  中文XML论坛 - 专业的XML技术讨论区  (http://bbs.xml.org.cn/index.asp)
--  『 SVG/GML/VRML/X3D/XAML 』  (http://bbs.xml.org.cn/list.asp?boardid=21)
----  请问大家,该作者在设置viewBox的玄机  (http://bbs.xml.org.cn/dispbbs.asp?boardid=21&rootid=&id=15544)

--  作者：moonsky731
--  发布时间：3/14/2005 4:52:00 PM

--  请问大家,该作者在设置viewBox的玄机
 <svg id="mainMap" x="0" y="15" viewBox="270079 -4216440 22268.3 28183.2" width="553" height="700" preserveAspectRatio="xMidYMid meet" xmlns="http://www.w3.org/2000/svg" zoomAndPan="magnify">
  <!-- this group is necessary for manual panning, it temporarily gets a translate transformation which is later removed on mouseup -->
  <g id="mainMapGroup" transform="translate(0,0)">
      <rect x="244000" y="-4231000" width="64000" height="81000" fill="white" stroke="none" id="mapBackgroundRect"/>
   <!-- within this group you should place all map layers, usually, if you have more than one element in a map layer, you would use a group instead of a single element, as in this example -->
   <image id="ShadedRelief" x="244141" y="-4232236" width="64577" height="82335" xlink:href="relief.jpg"/>
  </g>
 </svg>
请问大家,该作者在设置viewBox="270079 -4216440 22268.3 28183.2" 的时候,为什么会设的这么大,我试过了,只有它这个比例才能刚好显示,不知道他是怎么算出来的,看了半天也不明白,请大家帮帮我吧!!!


[此贴子已经被作者于2005-3-17 10:59:35编辑过]
--  作者：SCYANGYU
--  发布时间：3/16/2005 11:59:00 AM

--  
<?xml version="1.0" encoding="iso-8859-1" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<?AdobeSVGViewer save="snapshot"?>
<svg width="100%" height="100%" viewBox="0 0 1024 768" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:attrib="http://www.carto.net/attrib" onload="init(evt);" zoomAndPan="disable">
 <script type="text/ecmascript" xlink:href="../resources/helper_functions.js"/>
 <script type="text/ecmascript" xlink:href="../resources/mapApp.js"/>
 <script type="text/ecmascript" xlink:href="../gui/slider/slider.js"/>
 <script type="text/ecmascript" xlink:href="checkbox.js"/>
 <script type="text/ecmascript" xlink:href="navigation.js"/>
 <script type="text/ecmascript"><![CDATA[
  var myMapApp = new mapApp();
  var myMainMap;
  var myRefMapDragger;
  var myZoomSlider;
  function init(evt) {
   //dynamic layer array that allow loading from database
   var dynamicLayers = new Array();
   //initialize digiLayers (layers that allow digitizing)
   var digiLayers = new Array();
   myMainMap = new map("mainMap",64000,640,0.6,0,"m",true,"coordX","coordY",dynamicLayers,digiLayers,"");
   //slider properties: x1,y1,value1,x2,y2,value2,startValue,group in which to build the slider,color of slider
   //width of slider of sliderbar,width of invisible slider bar,width of visible slider
   myZoomSlider = new slider(710,70,myMainMap.minWidth,710,170,myMainMap.maxWidth,myMainMap.maxWidth,"mapZoomSlider","dimgray",2,10,"sliderSymbol","myRefMapDragger.resizeDragger",true);
   //set constraints to draggable rect in reference map
   myRefMapDragger = new dragObj("dragRectForRefMap","referenceMap","myDragCross",4750,true,"coordX","coordY",myMainMap);
   loadProjectSpecific();
  }
  function loadProjectSpecific() {
   //adopt width and height of map extent
   document.getElementById("myScaleTextW").firstChild.nodeValue = formatNumberString(myMainMap.curWidth.toFixed(myMainMap.nrDecimals)) + myMainMap.units;
   document.getElementById("myScaleTextH").firstChild.nodeValue = formatNumberString(myMainMap.curHeight.toFixed(myMainMap.nrDecimals)) + myMainMap.units;
   //adopt line width of park boundary
   document.getElementById("park_boundary").setAttributeNS(null,"stroke-width",myMainMap.curWidth*0.005); 
  }
]]></script>
 <defs>
 <!-- section for CSS stylesheet definitions -->
 <!-- you may globally adjust your styles here -->
 <style type="text/css"><![CDATA[
 .allText {font-family:Arial;fill:dimgray;}
 .titleText {font-size:22;font-weight:bold;}
 .subTitleText {font-size:18;font-weight:bold;}
 .normalText {font-size:15;}
 .smallText {font-size:12;}
 .boldText {font-weight:bold;}
 .centerText {text-anchor:middle;}
 .dragRect {fill:lightskyblue;stroke:none;opacity:0.4;}
 .dragSymbol {stroke:darkblue;}
 .normalLinestyle {fill:none;stroke:dimgray;}
 .background {fill:aliceblue;stroke:none;}
 .darkRectstyle {fill:dimgray;stroke:none;}
 .nofill {fill:none;}
 .whitefill {fill:white;}
 .normalfillcol {fill:dimgray;}
 .normallinecol {stroke:dimgray;}
 .nostroke {stroke:none;}
 .verythinline {stroke-width:1;}
 .thinline {stroke-width:1.5;}
 .normalline {stroke-width:2;}
 .mediumThickLine {stroke-width:5;}
  ]]></style>
  <!-- Symbols for checkboxes -->
  <symbol id="checkBoxRect" overflow="visible">
   <rect x="-6" y="-6" width="12" height="12" class="whitefill normallinecol thinline"/>
  </symbol>
  <symbol id="checkBoxCross" overflow="visible" class="normallinecol nofill verythinline" pointer-events="none">
   <line x1="-5" y1="-5" x2="5" y2="5"/>
   <line x1="-5" y1="5" x2="5" y2="-5"/>
  </symbol>
  <!-- Symbols for Zoom Magnifyer glasses -->
  <symbol id="magnifyer" overflow="visible" class="whitefill normalline normallinecol">
   <line x1="0" y1="0" x2="-8" y2="20"/>
   <circle r="8"/>
  </symbol>
  <symbol id="magnifyerZoomOut" overflow="visible" class="whitefill normalline normallinecol">
   <use xlink:href="#magnifyer"/>
   <line x1="-4" y1="0" x2="4" y2="0" style="stroke:dimgray;stroke-width:2;"/>
  </symbol>
  <symbol id="magnifyerZoomIn" overflow="visible">
   <use xlink:href="#magnifyer"/>
   <line x1="-4" y1="0" x2="4" y2="0" class="whitefill normalline normallinecol"/>
   <line x1="0" y1="-4" x2="0" y2="4" class="whitefill normalline normallinecol"/>
  </symbol>
  <symbol id="magnifyerFull" overflow="visible">
   <use xlink:href="#magnifyer"/>
   <text y="4.5" class="allText smallText centerText boldText" pointer-events="none">F</text>
  </symbol>
  <symbol id="magnifyerManual" overflow="visible">
   <line x1="0" y1="0" x2="-8" y2="20" class="whitefill normalline normallinecol"/>
   <circle r="8" class="whitefill normalline normallinecol"/>
   <rect x="-3" y="-3" width="6" height="6" class="nofill thinline normallinecol" stroke-dasharray="1.5,1.5"/>
  </symbol>
  <symbol id="magnifyerZoomInWo" overflow="visible" class="whitefill normalline normallinecol">
   <circle r="8"/>
   <line x1="-4" y1="0" x2="4" y2="0"/>
   <line x1="0" y1="-4" x2="0" y2="4"/>
  </symbol>
  <symbol id="magnifyerZoomOutWo" overflow="visible" class="whitefill normalline normallinecol">
   <circle r="8"/>
   <line x1="-4" y1="0" x2="4" y2="0" style="stroke:dimgray;stroke-width:2;"/>
  </symbol>
  <!-- hand symbol for panning -->
  <symbol id="symbPan" overflow="visible">
   <circle r="9" class="normallinecol normalline whitefill"/>
   <path class="normallinecol verythinline nofill" d="M-2 6 C -2.2 2.5 -8.0 -0 -5.7 -1.9 C -4.3 -2.5 -3.3 -0.5 -2.5 0.7 C -3.2 -2.1 -5.5 -5.2 -3.6 -5.8 C -2.1 -6.3 -1.6 -3.6 -1.1 -1.9 C -0.9 -4.2 -1.6 -6.4 -0.2 -6.6 C 1.4 -6.8 0.9 -3 1.1 -1.9 C 1.5 -3.5 1.2 -6.1 2.5 -6.1 C 3.9 -6.1 3.5 -3.2 3.6 -1.6 C 4 -2.9 4.1 -4.3 5.3 -4.4 C 7.3 -3.5 4 2.2 3 6z"/>
  </symbol>
  <!-- Symbol for Pan Arrows -->
  <symbol id="symbArrow" overflow="visible" class="nofill verythinline normallinecol" pointer-events="none">
   <polyline points="-3,-5 3,-5 3,1 5,1 0,5 -5,1 -3,1 -3,-5"/>
  </symbol>
  <!-- Symbol for Recentering Map -->
  <symbol id="symbRecenter" overflow="visible">
   <circle r="9" class="normallinecol normalline whitefill"/>
   <circle class="normalfillcol nostroke" cx="0" cy="0" r="1" pointer-events="none"/>
   <g class="normallinecol thinline nofill" pointer-events="none">
    <line x1="-7" y1="-7" x2="-3" y2="-3"/>
    <line x1="7" y1="7" x2="3" y2="3"/>
    <line x1="-7" y1="7" x2="-3" y2="3"/>
    <line x1="7" y1="-7" x2="3" y2="-3"/>
   </g>
  </symbol>
  <!-- Symbol for Slider -->
  <symbol id="sliderSymbol" overflow="visible" class="nofill mediumThickLine normallinecol" pointer-events="none">
   <line x1="0" y1="-5" x2="0" y2="5"/>
  </symbol>
  <!-- Symbol for Dragging if zoomed in far -->
  <symbol id="myDragCrossSymbol" overflow="visible" stroke-width="2000" class="nofill dragSymbol" pointer-events="none">
   <line x1="-7000" y1="0" x2="-2500" y2="0"/>
   <line x1="7000" y1="0" x2="2500" y2="0"/>
   <line x1="0" y1="-3300" x2="0" y2="-7800"/>
   <line x1="0" y1="3300" x2="0" y2="7800"/>
  </symbol>
  <!-- Marker for Extent-Arrows -->
  <marker id="myStartArrow" overflow="visible" orient="auto">
   <polyline class="nostroke normalfillcol" points="-0.5,0 8,-2 8,2"/>
  </marker>
  <marker id="myEndArrow" overflow="visible" orient="auto">
   <polyline class="nostroke normalfillcol" points="0.5,0 -8,-2 -8,2"/>
  </marker>
 </defs>
 <rect x="-500" y="-500" width="3000" height="3000" stroke="none" class="background" />
 <!-- Main Map Frame -->
 <svg id="mainMap" x="0" y="15" viewBox="244000 -4231000 64000 81000" width="553" height="700">
  <!-- this group is necessary for manual panning, it temporarily gets a translate transformation which is later removed on mouseup -->
  <g id="mainMapGroup" transform="translate(0,0)">
   <!-- within this group you should place all map layers, usually, if you have more than one element in a map layer, you would use a group instead of a single element, as in this example -->
   <image id="ShadedRelief" x="244141" y="-4232236" width="64577" height="82335" xlink:href="relief.jpg" />
   <path id="park_boundary" pointer-events="none" style="stroke:darksalmon;fill:none;stroke-opacity:0.7" stroke-width="320" d="M247896.461 -4183130.294l17.194 -334.066l6.167 -120.785l14.177 -278.726l5.319 -104.592l44.198 -864.678l52.7 -739.224l-270.992 -29.742l-187.969 -5.764l-161.838 -12.631l-199.923 -15.582l-75.026 -5.86l2.002 -50.817l3.161 -85.663l58.116 -1555.334l-167.547 -3.597l18.419 -254.937l56.049 -779.116l14.521 -202.734l2.436 -33.363l9.417 -131.35l1039.737 16.032l85.205 3.499l26.169 -169.606l32.902 -213.946l386.975 17.061l102.359 -445.439l711.325 20.156l36.331 -579.095l52.264 -835.885l10.962 -151.521l715.218 0.553l267.971 1.364l615.723 1.12l25.875 -673.944l-2.515 -97.275l46.438 -1535.672l46.364 -1535.678l69.632 -786.594l35.205 -833.183l47.275 -1120.863l-969.013 -16.329l-255.778 -4.457l-593.303 -10.211l-870.204 -15.07l-870.297 -15.165l-838.17 -43.705l-726.687 -27.565l18.44 -1031.023l18.451 -1031.024l29.621 -1658.459l29.69 -1662.683l17.55 -980.734l17.562 -980.846l11.643 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  </g>
 </svg>
 <!-- this group holds navigation, title and if you like, legend information -->
 <g>
  <!-- your map title -->
  <text class="allText titleText" x="580" y="30">Map Title</text>
  <!-- coordinate display -->
  <g class="allText normalText">
   <text id="coordX" x="730" y="145">X:</text>
   <text id="coordY" x="830" y="145">Y:</text>
  </g>
  <!-- display width and height of map extent -->
  <g>
   <!-- vertical line, displays current height of map extent -->
   <line class="normalLinestyle" style="stroke-width:1.5;marker-start:url(#myStartArrow);marker-end:url(#myEndArrow);" x1="561" y1="15" x2="561" y2="715"/>
   <rect class="background" x="555" y="330" width="12" height="70"/>
   <text id="myScaleTextH" class="allText normalText centerText" transform="translate(556,365),rotate(90)">81,000 m</text>
   <!-- horizontal line, displays current width of map extent -->
   <line class="normalLinestyle" style="stroke-width:1.5;marker-start:url(#myStartArrow);marker-end:url(#myEndArrow);" x1="0" y1="723" x2="553.1" y2="723"/>
   <rect class="background" x="242" y="717" width="70" height="12"/>
   <text id="myScaleTextW" class="allText normalText centerText" transform="translate(277,728)">64,000 m</text>
   <!-- small rectangle in lower right corner, onclick displays current map extent in real world coordinates -->
   <rect class="darkRectstyle" x="558.5" y="720.5" width="5" height="5" onclick="showExtent()" />
  </g>
  <!-- control map layer visibility with checkBoxes -->
  <g transform="translate(590 225)">
   <text class="allText subTitleText" x="-10" y="0">Map Layer Controls</text>
   <!-- first checkbox -->
   <g transform="translate(0 20)">
    <use id="checkBoxpark_boundary" xlink:href="#checkBoxRect" onclick="checkBoxScript(evt,'park_boundary');"/>
    <use id="checkCrosspark_boundary" xlink:href="#checkBoxCross" visibility="visible"/>
   </g>
   <!-- second checkbox -->
   <g transform="translate(200 20)">
    <use id="checkBoxShadedRelief" xlink:href="#checkBoxRect" onclick="checkBoxScript(evt,'ShadedRelief');"/>
    <use id="checkCrossShadedRelief" xlink:href="#checkBoxCross" visibility="visible"/>
   </g>
   <!-- checkbox text labels -->
   <g class="allText normalText">
    <text x="12" y="26">Park Boundary</text>
    <text x="212" y="26">Shaded Relief</text>
   </g>
  </g>
  <!-- map impressum and status Bar -->
  <g text-rendering="optimizeLegibility">
   <!-- text with this id is required to show help texts -->
   <text id="statusText" class="allText smallText" x="730" y="125">Statusbar: Your Status Text</text>
   <text class="allText smallText" x="1" y="760">Map Author: Your Name, 2004</text>
   <text class="allText smallText" x="510" y="760">Source: Your datasources</text>
  </g>
 </g>
 <!-- small reference map, shares the same coordinate system than the main map -->
 <svg id="referenceMap" x="580" y="45" viewBox="244000 -4231000 64000 81000" width="118.52" height="150" onmousedown="myRefMapDragger.drag(evt)" onmousemove="myRefMapDragger.drag(evt)" onmouseup="myRefMapDragger.drag(evt)" onmouseout="myRefMapDragger.drag(evt)">
  <image id="ShadedRelief" x="244141" y="-4232236" width="64577" height="82335" xlink:href="relief_small.jpg" />
  <path pointer-events="none" style="fill:none;stroke:salmon;stroke-width:1000" d="M250528.8 -4218899.3l2380.5 -1305.3l1593.4 928.3l1326.1 -752.7l4218.1 -70.2l4072.3 -3965.5l5552.8 -1556.9l313 -1368.6l3042.8 -2535.6l1098.2 945.4l124.7 2135.2l2579.4 431.2l-22.8 1238l3516.2 779.5l-66.6 -1725.9l1001.7 -419l625.5 2735.2l1659.5 476.6l-330.2 1248.2l1330.8 747.9l-583.6 1341.1l1261.8 -103.1l285.3 729.8l1411.9 -2540.5l552.1 995.2l2360 129.9l1432.7 1622l2981.7 1123.5l2940.7 4333.1l-270.6 1128.2l792.4 1201.5l-1726.7 5827.8l785 2018.2l2160 2274.1l2083.2 772.6l-29.7 1587l2579.8 273.2l2903.1 2611.6l-1211.6 1736.7l-304 2424.3l1806.8 664.5l-952.3 432.8l228.8 1126.8l-1164.6 1204.8l1028.8 823.8l134.5 1768.4l-3601.7 2856.7l-1067.8 2250.5l-1294 1012.3l939.2 1643.7l-426.7 1493.5l-1730.1 1237.5l-1330.5 3254.3l-3443.5 3823l-1377.3 499.3l-1732.6 -647.3l-2658.4 9242.1l-2580.3 -63.8l-1626.7 1640.8l-11817 92.4l-111.4 4297.6l-745.7 11.6l-6670.9 -270.2l-1972.9 -5940.7l-1565.6 -523.5l821.7 -7022.1l-765 -27.8l26.9 -795.4l742.7 19.8l74.1 -825.8l-2396.2 -52l748.7 -3186.1l-3846.4 -78l60.9 -5551.1l-1599 -53.4l110.1 -3306.4l-6584.6 -269.6l-573.6 -4908.1l-895.7 -69.6l-3.4 -3096.9l2384.7 -772.2l99.6 -1566.5l1598.9 3l268.3 -6583.2l-5123.5 -132.5l183.9 -10111.9l1168.6 -4214.1l-716.7 -975.6l1461.4 -2002.8l-593.4 -565.8l2659.9 -3238.9z" />
  <!-- rectangle that represents map extent -->
  <rect id="dragRectForRefMap" class="dragRect" x="244000" y="-4231000" width="64000" height="81000" pointer-events="none"/>
  <!-- if zoomed in very far, we display a cross-symbol here to indicate the map position in the reference map -->
  <use id="myDragCross" x="260000" y="-4190000" xlink:href="#myDragCrossSymbol" visibility="hidden" />
 </svg>
 <!-- this group holds symbol instances for navigation tools -->
 <g>
  <!-- empty group where zoomSlider is later appended -->
  <g id="mapZoomSlider"/>
  <text class="allText subTitleText" x="735" y="55">Map Navigator</text>
  <!-- button for zoom-in, above slider -->
  <use x="710" y="55" xlink:href="#magnifyerZoomInWo" onclick="zoomIt(evt,'in');" onmouseover="magnify(evt,1.2,'in');" onmouseout="magnify(evt,1,'in');"/>
  <!-- button for zoom-out, below slider -->
  <use x="710" y="185" xlink:href="#magnifyerZoomOutWo" onclick="zoomIt(evt,'out');" onmouseover="magnify(evt,1.2,'out');" onmouseout="magnify(evt,1,'out');"/>
  <!-- button for full view (f) -->
  <use x="740" y="85" xlink:href="#magnifyerFull" onclick="zoomIt(evt,'full');" onmouseover="magnify(evt,1.2,'full');" onmouseout="magnify(evt,1,'full');"/>
  <!-- button for manual zoom (rectangle) -->
  <use x="770" y="85" xlink:href="#magnifyerManual" onclick="myMainMap.zoomManual(evt)" onmouseover="magnify(evt,1.2,'manual');" onmouseout="magnify(evt,1,'manual');"/>
  <!-- button for manual pan -->
  <use x="800" y="85" xlink:href="#symbPan" onclick="myMainMap.panManual(evt)" onmouseover="magnify(evt,1.2,'panmanual');" onmouseout="magnify(evt,1,'panmanual');"/>
  <!-- button for redefining map center -->
  <use xlink:href="#symbRecenter" x="830" y="85" onmouseover="magnify(evt,1.2,'recenter')" onmouseout="magnify(evt,1,'recenter')" onclick="myMainMap.recenter(evt)"/>
 </g>
</svg>

--  作者：SCYANGYU
--  发布时间：3/16/2005 12:02:00 PM

--  
我研究了一下，好象没有什么特别的意思！
--  作者：行云流水
--  发布时间：3/17/2005 3:42:00 PM

--  
以下是引用SCYANGYU在2005-3-16 12:02:21的发言：
我研究了一下，好象没有什么特别的意思！


虽然做出的图本身没什么意义，但viewbox还是有很大学问的，主要与窗口缩放尺寸有关。

It is often desirable to specify that a given set of graphics stretch to fit a particular container element. The viewBox attribute provides this capability.

--  作者：行云流水
--  发布时间：3/17/2005 3:44:00 PM

--  
具体可以查一下svg1.1手册的：
7 Coordinate Systems, Transformations and Units
------7.7 The viewBox attribute
--  作者：henrybenben
--  发布时间：4/13/2005 11:03:00 PM

--  
viewbox有点奥妙，正在研究中
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