openLayers 教程

--- layout: example.html title: Vector Labels shortdesc: Example of GeoJSON features with labels. docs: > This example showcases a number of options that can be set on text styles. When "Text/Wrap" is chosen (for example for the line features), the label is wrapped by inserting the character `\n`, which will create a multi-line label. The "Open Sans" web font will be loaded on demand, to show dynamic font loading. tags: "geojson, vector, openstreetmap, label" --- <div id="map" class="map"></div> <div class="edit-form"> <input id="refresh-points" type="button" value="Refresh" /> <h2>Points</h2> <div class="edit-form-elem"> <label for="points-text">Text: </label> <select id="points-text"> <option value="hide">Hide</option> <option value="normal">Normal</option> <option value="shorten" selected="selected">Shorten</option> <option value="wrap">Wrap</option> </select> <br /> <label for="points-maxreso" title="Max Resolution Denominator">MaxReso.: </label> <select id="points-maxreso"> <option value="38400">38,400</option> <option value="19200">19,200</option> <option value="9600">9,600</option> <option value="4800">4,800</option> <option value="2400">2,400</option> <option value="1200" selected="selected">1,200</option> <option value="600">600</option> <option value="300">300</option> <option value="150">150</option> <option value="75">75</option> <option value="32">32</option> <option value="16">16</option> <option value="8">8</option> </select> <br /> <label for="points-align">Align: </label> <select id="points-align"> <option value="center" selected="selected">Center</option> <option value="end">End</option> <option value="left">Left</option> <option value="right">Right</option> <option value="start">Start</option> </select> <br /> <label for="points-baseline">Baseline: </label> <select id="points-baseline"> <option value="alphabetic">Alphabetic</option> <option value="bottom">Bottom</option> <option value="hanging">Hanging</option> <option value="ideographic">Ideographic</option> <option value="middle" selected="selected">Middle</option> <option value="top">Top</option> </select> <br /> <label for="points-rotation">Rotation: </label> <select id="points-rotation"> <option value="0">0°</option> <option value="0.785398164">45°</option> <option value="1.570796327">90°</option> </select> <br /> <label for="points-font">Font: </label> <select id="points-font"> <option value="Arial" selected="selected">Arial</option> <option value="'Courier New'">Courier New</option> <option value="'Open Sans'">Open Sans</option> <option value="Verdana">Verdana</option> </select> <br /> <label for="points-weight">Weight: </label> <select id="points-weight"> <option value="bold">Bold</option> <option value="normal" selected="selected">Normal</option> </select> <br /> <label for="points-placement">Placement: </label> <select disabled id="points-placement"> <option value="line">Line</option> <option value="point" selected="selected">Point</option> </select> <br /> <label for="points-maxangle">Max Angle: </label> <select disabled id="points-maxangle"> <option value="0.7853981633974483" selected="selected">45°</option> <option value="2.0943951023931953">120°</option> <option value="6.283185307179586">360°</option> </select> <br /> <label for="points-overflow">Exceed Len: </label> <select disabled id="points-overflow"> <option value="true">True</option> <option value="false" selected="selected">False</option> </select> <br /> <label for="points-size">Size: </label> <input type="text" value="12px" id="points-size" /> <br /> <label for="points-height">Line height: </label> <input type="text" value="1" id="points-height" /> <br /> <label for="points-offset-x">Offset X: </label> <input type="text" value="0" id="points-offset-x" /> <br /> <label for="points-offset-y">Offset Y: </label> <input type="text" value="0" id="points-offset-y" /> <br /> <label for="points-color">Color: </label> <input type="text" value="#aa3300" id="points-color" /> <br /> <label for="points-outline" title="Outline Color">O. Color: </label> <input type="text" value="#ffffff" id="points-outline" /> <br /> <label for="points-outline-width" title="Outline Width">O. Width: </label> <input type="text" value="3" id="points-outline-width" /> </div> </div> <div class="edit-form"> <input id="refresh-lines" type="button" value="Refresh" /> <h2>Lines</h2> <div class="edit-form-elem"> <label for="lines-text">Text: </label> <select id="lines-text"> <option value="hide">Hide</option> <option value="normal">Normal</option> <option value="shorten">Shorten</option> <option value="wrap" selected="selected">Wrap</option> </select> <br /> <label for="lines-maxreso" title="Max Resolution Denominator">MaxReso.: </label> <select id="lines-maxreso"> <option value="38400">38,400</option> <option value="19200">19,200</option> <option value="9600">9,600</option> <option value="4800">4,800</option> <option value="2400">2,400</option> <option value="1200" selected="selected">1,200</option> <option value="600">600</option> <option value="300">300</option> <option value="150">150</option> <option value="75">75</option> <option value="32">32</option> <option value="16">16</option> <option value="8">8</option> </select> <br /> <label for="lines-align">Align: </label> <select id="lines-align"> <option value="" selected="selected"></option> <option value="center">Center</option> <option value="end">End</option> <option value="left">Left</option> <option value="right">Right</option> <option value="start">Start</option> </select> <br /> <label for="lines-baseline">Baseline: </label> <select id="lines-baseline"> <option value="alphabetic">Alphabetic</option> <option value="bottom">Bottom</option> <option value="hanging">Hanging</option> <option value="ideographic">Ideographic</option> <option value="middle" selected="selected">Middle</option> <option value="top">Top</option> </select> <br /> <label for="lines-rotation">Rotation: </label> <select id="lines-rotation"> <option value="0">0°</option> <option value="0.785398164">45°</option> <option value="1.570796327">90°</option> </select> <br /> <label for="lines-font">Font: </label> <select id="lines-font"> <option value="Arial">Arial</option> <option value="'Courier New'" selected="selected">Courier New</option> <option value="'Open Sans'">Open Sans</option> <option value="Verdana">Verdana</option> </select> <br /> <label for="lines-weight">Weight: </label> <select id="lines-weight"> <option value="bold" selected="selected">Bold</option> <option value="normal">Normal</option> </select> <br /> <label for="lines-placement">Placement: </label> <select id="lines-placement"> <option value="line">Line</option> <option value="point" selected="selected">Point</option> </select> <br /> <label for="lines-maxangle">Max Angle: </label> <select id="lines-maxangle"> <option value="0.7853981633974483" selected="selected">45°</option> <option value="2.0943951023931953">120°</option> <option value="6.283185307179586">360°</option> </select> <br /> <label for="lines-overflow">Exceed Len: