plotpanel.java

Java Design Pattern:Strategy 希望对大家有所帮助！

import java.awt.*;
import java.awt.event.*;
import java.util.*;

//swing classes
import javax.swing.text.*;
import javax.swing.*;
import javax.swing.event.*;
//--------------------------------------------
public class PlotPanel extends JPanel {
    private float xfactor, yfactor;
    protected int xpmin, ypmin, xpmax, ypmax;
    private float minX, maxX, minY, maxY;
    protected float x[], y[];
    protected Color color;
//--------------------------------------------
    public void setBounds(float minx, float miny, float maxx, float maxy) {
        minX = minx;
        maxX = maxx;
        minY = miny;
        maxY = maxy;
    }                                           
//--------------------------------------------
    public void plot(float[] xp, float[] yp, Color c) {
        x = xp;      //copy in the arrays
        y = yp;
        color = c;   //and color

        //compute bounds and sclaing factors
        int w = getWidth() - getInsets().left - getInsets().right;
        int h = getHeight() - getInsets().top - getInsets().bottom;

        xfactor = (0.9f * w) / (maxX - minX);
        yfactor = (0.9f * h)/ (maxY - minY);

        xpmin = (int)(0.05f * w);
        ypmin = (int)(0.05f * h);
        xpmax = w - xpmin;
        ypmax = h - ypmin;
        repaint();      //this causes the actual plot
    }
//--------------------------------------
    protected int calcx(float xp) {
        return(int)((xp-minX) * xfactor + xpmin);
    }
//--------------------------------------
    protected int calcy(float yp) {
        int ypnt = (int)((yp-minY) * yfactor);
        return ypmax - ypnt;
    }

}