linelayer.java

geotools的源码

package uk.ac.leeds.ccg.geotools;

import java.awt.*;
public class LineLayer extends uk.ac.leeds.ccg.geotools.PolygonLayer
implements LockableSize
{
	int defaultSize = 3;
  public void addGeoLine(GeoLine line) {
    this.addGeoLine(line, false);
  }
  public void addGeoLine(GeoLine line, boolean keepQuiet) {
    super.addGeoShape(line, keepQuiet);
  }
	public int getID(GeoPoint p,Scaler s){
		double w = s.toMap(defaultSize);
		for(int i = 0;i < shapeList.size();i++) {
			GeoLine temp = (GeoLine)shapeList.elementAt(i);
			if(temp.isNear(p,w)) return temp.getID();
		}
		return -1;
	}
	public void setDefaultSize(int x){
		defaultSize=x;
	}
	public int getDefaultSize(){
		return defaultSize;
	}


    public void fatLine(Graphics g, int x1, int y1, int x2, int y2,int w)
    {
            int x_diff = x1 - x2;
            x_diff *= x_diff;
            int y_diff = y1 - y2;
            y_diff *= y_diff;
            int x_shift = 0;
            int y_shift = 0;
            if (y_diff < x_diff)
            {
                    x_shift = 0;
                    y_shift = 1;
            }
            else
            {
                    y_shift = 0;
                    x_shift = 1;
            }

            g.drawLine(x1, y1, x2, y2);
            int shift = 1;
            for (int index = 1; index < w; index++)
            {
                    g.drawLine(x1 - x_shift*shift, y1 -y_shift*shift,
                            x2 - x_shift*shift, y2 - y_shift*shift);

                    shift *= -1;
                    if (shift >0)
                            shift += 1;
            }
    }
    public void drawPolyFeature(Graphics g,Polygon p,int width){
         if(width==1){
			g.drawPolyline(p.xpoints,p.ypoints,p.npoints);
		}
		else{
			//oh boy this is gona be fun
			for(int j=0;j<p.npoints-1;j++){
			    fatLine(g,p.xpoints[j],p.ypoints[j],p.xpoints[j+1],p.ypoints[j+1],width);
			}
		}
        
    }
    public void fillPolyFeature(Graphics g,Polygon p){
        //you cant fill lines!
    }
    
}