rampshader.java

geotools的源码

package uk.ac.leeds.ccg.geotools;

import java.lang.*;
import java.awt.*;
import java.io.*;
/**
 * @author <a href="http://www.geog.leeds.ac.uk/staff/i.turton/i.turton.html">
 * Ian Turton</a> Centre for
 * Computaional Geography, University of Leeds, LS2 9JT, 1998.<br>
 * <a href="mailto:[e-mail]">[e-mail]</a>
 **/

public class RampShader extends SimpleShader implements uk.ac.leeds.ccg.geotools.Shader,Serializable
{
		//private Color lo=Color.white;
		//private Color hi=Color.red;
    
    private boolean rangeSet = false;
		private double grad,inter;
		//private double l,h;
    
        public RampShader(){
            conf = new Configure();
        }
    
		public RampShader(double low,double hi){
		    this();
			setRange(low,hi);
		}
    
   
	public void setRange(double low,double hi){
	    super.setRange(low,hi);
	    if(min==max) max+=1.0d;
			grad = 255.0/(max-min);
			inter = 255.0 - (grad*max);
			
			rangeSet=true;
    }

	
	public void extendRange(double low,double hi){
	    if (!rangeSet){
	        setRange(low,hi);
	    }
	    setRange(Math.min(low,min),Math.max(hi,max));
	}
	    
	/*		
    public void setMissingValueColor(Color color)
    {
        missingColor=color;
    }
    
    public void setMissingValueCode(double code)
    {   
        missingCode=code;
    }*/
    
    public int getRGB(double value)
    {
        return (getColor(value).getRGB());
    }
    
   /* public Color getMissingValueColor()
    {
        return missingColor;
    }
    
    public double getMissingValueCode()
    {
        return missingCode;
    }*/
		public double getIntercept(){
			return inter;
		}
		public double getGradient(){
			return grad;
		}
    public Color getColor(double value){
				if(value==missingCode)  return missingColor;
				if(value>max||value<min) return missingColor;
				int c=(int)(value*grad+inter);
				//System.out.println(value+" -> "+c);
				c=(int)Math.min(255.0,c);
				//System.out.println(value+" -> "+c);
				c=(int)Math.max(0.0,c);
//				System.out.println(value+" -> "+c);
				Color ret = new Color( c,0,255-c);
        return ret;
    }
    
    /**
     * Gets a descriptive name for this shader type
     */
    public String getName(){
        return "Ramp Shader";
    }
    
    
   
    
}