GWT openlayers，DrawFeature线条样式

Question

我使用gwt openlayers在地图上绘制一些线条。我想改变绘制特征线的外观。我注意到PathHandler类有setStyle方法，但使用此方法设置样式不会改变线条外观。

private DrawFeature createDrawFeature() { 
    DrawFeatureOptions options = new DrawFeatureOptions(); 
    options.onFeatureAdded(getStyle()); 
    PathHandler handler = new PathHandler(); 
    handler.setStyle(style); 
    return new DrawFeature(layer, handler, options); 
} 
private Style getStyle() { 
    Style style = new Style(); 
    style.setStrokeColor("#ffffff"); 
    style.setStrokeWidth(2.0); 
    return style; 
} 

我试图设置不同的风格选项，但没有效果。 有谁知道如何改变DrawFeature线的外观？

Answer 1

如果草图的风格（特征在完成之前）执行绘图（点，路径或多边形）的处理程序负责。

所以样式你做的草图：

//Create a style. We want a blue dashed line. 
    final Style drawStyle = new Style(); //create a Style to use 
    drawStyle.setFillColor("white"); 
    drawStyle.setGraphicName("x"); 
    drawStyle.setPointRadius(4); 
    drawStyle.setStrokeWidth(3); 
    drawStyle.setStrokeColor("#66FFFF"); 
    drawStyle.setStrokeDashstyle("dash"); 

    //create a StyleMap using the Style 
    StyleMap drawStyleMap = new StyleMap(drawStyle); 

    //Create PathHanlderOptions using this StyleMap 
    PathHandlerOptions phOpt = new PathHandlerOptions(); 
    phOpt.setStyleMap(drawStyleMap); 

    //Create DrawFeatureOptions and set the PathHandlerOptions (that have the StyleMap, that have the Style we wish) 
    DrawFeatureOptions drawFeatureOptions = new DrawFeatureOptions(); 
    drawFeatureOptions.setHandlerOptions(phOpt); 

    PathHandler pathHanlder = new PathHandler(); 

    // Create the DrawFeature control to draw on the map, and pass the DrawFeatureOptions to control the style of the sketch 
    final DrawFeature drawLine = new DrawFeature(vectorLayer, pathHanlder, drawFeatureOptions); 
    map.addControl(drawLine); 
    drawLine.activate(); 

我还添加了一个例子，她展示：http://demo.gwt-openlayers.org/gwt_ol_showcase/GwtOpenLayersShowcase.html?example=DrawFeature%20style%20example