计算机科学论坛--选择可见元素的设置

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    <TITLE>Tutorial - Printing</TITLE>
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    <TABLE BORDER="0" CELLPADDING="0" CELLSPACING="2" WIDTH="100%">
      <TR>
        <TD ALIGN="left" CLASS="size2"><B>Printing</B></TD>
        <TD ALIGN="right"></TD>
      </TR>
    </TABLE>
    <P CLASS="size1">In addition to the accurate color control SVG offers through ICC color support, your SVG images are capable of printing at the maximum resolution of any printer. Instead of printing jagged screen resolution images, your SVG images will print with smooth edges and clean gradients. SVG documents are printable with all the same graphics rendering features as displayed on-screen. Any embedded fonts and unusual glyphs, as well as filter effects, will print. Another feature is that the current displayed state of the image is printed. Also, if you have zoomed in or out or panned the image, that state of the image is printed.
    <P CLASS="size1">With the example below, select different viewing modes, try zooming in and out of the image, and then print the result from your browser.
    <CENTER>
      <P CLASS="size1"><EMBED WIDTH="400" HEIGHT="400" SRC="/svg/svgfiles/map.svgz" NAME="printable_map" PLUGINSPAGE="http://www.adobe.com/svg/viewer/install/"></CENTER>
    <P CLASS="size1">
    <SCRIPT LANGUAGE="JavaScript1.2"><!--
/*
      * This function turns on/off various layers of the SVG picture.
      * It is called when the user clicks on any of the checkboxes in
      * the form below.
      *
      * Input Parameters:
      *   checkbox     - Form object (checkbox) that was clicked on.
      *   element_name - SVG element name that should be made visible/
      *                  invisible.
      */
      function hilite_elem (checkbox, element_name)
      {
       var svgobj;
       var svgstyle;
       var svgdoc = document.printable_map.getSVGDocument();

// For each element, get the element's style object, then set
// its visibility according to the state of the checkbox.

       svgobj = svgdoc.getElementById(element_name);
       svgstyle = svgobj.getStyle();
       if (!checkbox.checked)
       {
        // Hide layer.
        svgstyle.setProperty('visibility', 'hidden');
       }
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}
// -->
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      <TR>
        <TD COLSPAN="2" CLASS="size1">Visible layers:<BR>
          </TD>
      </TR>
      <TR>
        <TD CLASS="size1"><INPUT TYPE="checkbox" VALUE="" ONCLICK="hilite_elem(this,'topography')">Topography</TD>
        <TD CLASS="size1"><INPUT TYPE="checkbox" VALUE="" ONCLICK="hilite_elem(this,'labels')">Labels</TD>
      </TR>
      <TR>
        <TD CLASS="size1"><INPUT TYPE="checkbox" VALUE="" ONCLICK="hilite_elem(this,'streets')">Streets</TD>
        <TD CLASS="size1"><INPUT TYPE="checkbox" VALUE="" ONCLICK="hilite_elem(this,'points_of_interest')">Points of Interest</TD>
      </TR>
      <TR>
        <TD CLASS="size1"><INPUT TYPE="checkbox" VALUE="" ONCLICK="hilite_elem(this,'freeways')">Freeways</TD>
        <TD CLASS="size1"><INPUT TYPE="checkbox" VALUE="" ONCLICK="hilite_elem(this,'border_legend')">Legend</TD>
      </TR>
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    </SCRIPT>
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      <P CLASS="size1"><A HREF="/svg/source/printable_js.html">view JavaScript source</A>
      <P CLASS="size1"><A HREF="/svg/dynamic/transformations.html" TARGET="_top">Next lesson: Dynamic SVG - Transformations</A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="740">
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