createfeature.java

MapXtreme 用于电子地图制作与分析

package barchant;

import java.util.*;
import com.mapinfo.dp.*;
import com.mapinfo.util.*;
import com.mapinfo.graphics.Rendition;
import com.mapinfo.graphics.RenditionImpl;
import java.awt.*;
import com.mapinfo.dp.annotation.*;
import com.mapinfo.mapj.*;//VisualMapJ没有FeatureFactory
import com.mapinfo.dp.util.LocalDataProviderRef;
import com.mapinfo.coordsys.LinearUnit;
import javax.swing.*;
import com.mapinfo.graphics.LocalRenderer;

/*该示例演示了怎样常见图元，以创建点图元和圆图元为例，其他的可参考资料中的例子，注意本例只是响临时图层添加图元，向数据库道理应一样*/
public class CreateFeature {
  public MapJ myMap;//可管理地图集的各种状态，并向服务器转发客户请求
  public FeatureLayer world;//Feature对象用来访问地图对象

  public CreateFeature() {
    myMap=new MapJ();
    // Get Feature Factory reference
FeatureFactory ff = myMap.getFeatureFactory();
/*创建点 成功
DoublePoint pt = new DoublePoint(-100, 45);
Rendition labelRend = null;

// 创建 rendition 控制图元的 symbol font, char, size, and color set
Rendition rend = new RenditionImpl();
rend.setValue(Rendition.SYMBOL_MODE, Rendition.SymbolMode.FONT);
rend.setValue(Rendition.FONT_FAMILY, "MapInfo Shields");
rend.setValue(Rendition.SYMBOL_STRING, "@");
rend.setValue(Rendition.FONT_SIZE, 16);
rend.setValue(Rendition.SYMBOL_FOREGROUND, Color.blue);

//创建该图元的属性信息，两个属性，一个是字符型的，一个是数值型的
Attribute attrs[] = { new Attribute("Point"), new Attribute(2) };

// Make the first Attribute the PrimaryKey将第一个属性作为主键，即将"point"作为主键
PrimaryKey key = new PrimaryKey(attrs[0]);
*/

    /*创建圆*/
// 创建属性数据
Attribute att[] = new Attribute[1];
att[0] = new Attribute("Feature1");

/* This will not work for tab files. For tab files you must use the
com.mapinfo.tab.TABStyleFactory to create an appropriate Rendition object.
*/
//控制图元显示
Rendition rend = RenditionImpl.getDefaultRendition();
// For circles, specify the edge and fill color.
rend.setValue(Rendition.STROKE, Color.cyan);
rend.setValue(Rendition.FILL, Color.green);
// For points, specify the symbol size, font, and color
rend.setValue(Rendition.SYMBOL_STRING, "@");
rend.setValue(Rendition.FONT_SIZE, 16);
rend.setValue(Rendition.FONT_FAMILY, "MapInfo Shields");
rend.setValue(Rendition.SYMBOL_FOREGROUND, Color.blue);
// For lines, specify the line color and width
rend.setValue(Rendition.STROKE, Color.green);
rend.setValue(Rendition.STROKE_WIDTH, 4);
// For ellipses, specify the fill color and opacity
rend.setValue(Rendition.FILL, Color.blue);
rend.setValue(Rendition.FILL_OPACITY, new Float(0.40));

// 设置圆中心位置
DoublePoint dp = new DoublePoint(-104, 45);
// Create Circular region
int circType=1;
int circRadius=25;
int circResolution=25;
PrimaryKey pkey = new PrimaryKey(att[0]);

try{
//创建点图元，需要的信息有点的位置，rendition显示格式，labelrendition，属性，主键
      Feature point = ff.createCircularRegion(circType, dp, circRadius,
LinearUnit.mile,circResolution, rend,null, att,pkey);

// add the Feature to our previously created annotation layer
//将图元添加到临时图层，无论是哪种图层都需要用DataProvider来定义，三个步骤
    // 描述数据
AnnotationTableDescHelper annTDHelper = new AnnotationTableDescHelper("annotations");
   //定义数据源
AnnotationDataProviderHelper annDPHelper = new AnnotationDataProviderHelper();
// An Annotation layer requires the use of local memory space, so we create a LocalDataProviderRef
   //获取数据的方式，本地方式
LocalDataProviderRef localDPRef = new LocalDataProviderRef(annDPHelper);

// 添加临时图层
Layer annotLayer= myMap.getLayers().add(localDPRef, annTDHelper, "Annotations");
//在临时图层上添加该点图元
annotLayer.addFeature(point);
   System.out.println("aaaaaaaaaaaaa");

}
catch (Exception e)
{
e.printStackTrace();
}


}
  public static void main(String args[]){
    CreateFeature bclr=new CreateFeature();
  }

}