我的图形用户界面中的画布在按下“显示”操作按钮时不会更新或重新绘制。当扩展下拉框被更改并且画布应在“显示”时产生不同的显示时，这是显而易见的。
如果有人能指出代码中的错误，我们将不胜感激。在画布上绘制图形线时也遇到问题，有些似乎是填充而不是绘制，我认为这可能是由于画布重绘错误造成的。
谢谢，下面的代码
import java.awt.*;
import javax.swing.*;
import java.awt.event.*; //Import event handler classes
import java.awt.geom.*; // Geom packages
public class Listric_gui extends JFrame
implements ActionListener, ItemListener {
JPanel pane = new JPanel ();
JComboBox Extension;
MyCanvas can1;
//Class Variables
static float[]x = new float[201];
static float[]y = new float[201];
static float[]y2 = new float[201];
static float[] hwd = new float [201];
//static float Dip = 0f;
static int end = 200;
static int i, e1;
static int x_ending=160, y_ending = 35, ticksize=5;
static float x_orig = 50f, y_orig=50f, x_scale=4f, y_scale=5f,hwd_orig=50f,hwd_scale=5f;
Listric_gui () {
try{
UIManager.setLookAndFeel (
//"com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
System.err.println("Can't set look and feel: " + e);
}
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints constraints = new GridBagConstraints();
pane.setLayout(gridbag);
setBackground(Color.lightGray);
//Title
buildConstraints(constraints, 0,0,5,1,0,10);
constraints.fill = GridBagConstraints.BOTH;
Font f = new Font ("Helvetica", Font.BOLD, 22);
JLabel label1 = new JLabel("Fault Modelling Program", JLabel.CENTER);
label1.setFont (f);
//label1.setBackground(Color.white);
label1.setBackground(Color.red);
gridbag.setConstraints(label1, constraints);
pane.add(label1);
//Initialise Button objects
//File
buildConstraints(constraints, 0, 1, 1, 1, 1, 10);
constraints.fill = GridBagConstraints.BOTH;
Font f1 = new Font("Helvetica", Font.BOLD, 14);
JButton file = new JButton("File");
gridbag.setConstraints(file, constraints);
file.setFont(f1);
pane.add(file);
//Input
buildConstraints(constraints, 1, 1, 1, 1, 1, 0);
constraints.fill = GridBagConstraints.BOTH;
//constraints.ipadx = 10;
JButton input = new JButton ("Input");
gridbag.setConstraints(input,constraints);
input.setFont(f1);
pane.add(input);
//Run
buildConstraints(constraints, 2, 1, 1, 1, 1, 0);
constraints.fill = GridBagConstraints.BOTH;
JButton run = new JButton ("Run");
gridbag.setConstraints(run, constraints);
run.setFont(f1);
pane.add(run);
//Display Button
buildConstraints(constraints, 3, 1, 1, 1, 1, 0);
constraints.fill = GridBagConstraints.BOTH;
JButton display = new JButton ("Display");
gridbag.setConstraints(display, constraints);
display.setFont(f1);
pane.add(display);
//Quit button
buildConstraints(constraints, 4, 1, 1, 1, 1, 0);
constraints.fill = GridBagConstraints.BOTH;
JButton quit = new JButton ("Quit");
gridbag.setConstraints(quit, constraints);
quit.setFont(f1);
pane.add(quit);
//Fault Geometry label
buildConstraints(constraints, 0, 2, 1, 1, 1, 10);
constraints.fill = GridBagConstraints.NONE;
constraints.anchor = GridBagConstraints.SOUTH;
JLabel label2 = new JLabel ("Fault Geometry", JLabel.CENTER);
label2.setFont(f1);
gridbag.setConstraints(label2, constraints);
pane.add(label2);
//Geometry - Listric
buildConstraints(constraints, 0, 3, 1, 1, 1, 10);
constraints.fill = GridBagConstraints.NONE;
constraints.anchor = GridBagConstraints.NORTH;
JCheckBox C1 = new JCheckBox ("Listric");
gridbag.setConstraints(C1, constraints);
pane.add(C1);
//Checkbox group define so that only one selected at time
ButtonGroup bg = new ButtonGroup ();
bg.add(C1);
//Extension Label
buildConstraints(constraints, 0, 4, 1, 1, 1, 10);
constraints.anchor = GridBagConstraints.SOUTH;
JLabel label3 = new JLabel ("Extension", JLabel.CENTER);
label3.setFont(f1);
gridbag.setConstraints(label3, constraints);
pane.add(label3);
//Extension Choice
buildConstraints(constraints, 0, 5, 1, 1, 1, 10);
constraints.fill = GridBagConstraints.NONE;
constraints.anchor = GridBagConstraints.NORTH;
JComboBox Extension = new JComboBox ();
Extension.addItem ("-5 km");
Extension.addItem ("-2 km");
Extension.addItem ("0 km");
Extension.addItem ("5 km");
Extension.addItem ("10 km");
Extension.addItem ("15 km");
Extension.addItem ("20 km");
Extension.addItem ("25 km");
Extension.addItem ("30 km");
gridbag.setConstraints(Extension, constraints);
pane.add(Extension);
//Draw Canvas
buildConstraints(constraints, 1, 2, 4, 5, 0, 0);
constraints.fill = GridBagConstraints.BOTH;
MyCanvas can2 = new MyCanvas (); // paint method in seperate class
gridbag.setConstraints(can2, constraints);
can2.setBackground(Color.white);
pane.add(can2);
//Add all event listeners to components
display.addActionListener(this);
quit.addActionListener(this);
Extension.addActionListener(this);
setContentPane(pane);
}
//Define main block
public static void main (String args[]){
JFrame frame = new Listric_gui();
//Method to exit
WindowListener l = new WindowAdapter (){
public void windowClosing (WindowEvent e) {
System.exit (0);
}
};
frame.addWindowListener (l);
frame.setSize(1600,600);
//frame.pack();
//frame.revalidate();
//frame.repaint();
frame.setVisible (true);
}
static void buildConstraints(GridBagConstraints gbc, int gx, int gy, int gw, int gh, int wx, int wy){
gbc.gridx = gx;
gbc.gridy = gy;
gbc.gridwidth = gw;
gbc.gridheight = gh;
gbc.weightx = wx;
gbc.weighty = wy;
}
public Insets getInsets() {
return new Insets (10, 10, 10, 10);
}
//declare actionlistener method
public void actionPerformed (ActionEvent ae) {
String label = ae.getActionCommand();
if (label == "Display") {
Modelling m1 = new Modelling ();
can1= new MyCanvas();
pane.add(can1);
setContentPane(pane);
}else if (label == "Quit")
System.exit(0);
}
public void itemStateChanged (ItemEvent evt) {
if(evt.getSource () == Extension) {
String s = (String) evt.getItem ();
if (s == "-5 km")
e1 = (int) -5f;
if (s == "-2 km")
e1 = (int) -2f;
if (s == "0 km")
e1 = (int) 0f;
else if (s == "5 km")
e1 = (int) 5f;
else if (s == "10 km")
e1 = (int) 10f;
else if (s == "15 km")
e1 = (int) 15f;
else if (s == "20 km")
e1 = (int) 20f;
else if (s == "25 km")
e1 = (int) 25f;
else if (s == "30 km")
e1 = (int) 30f;
}
}
//End of controlling class
//Class for modelling fault
class Modelling {
Modelling () {
calc ();
}
private void calc () {
float Sum1, Sum2, Sum3, Sum4, Sum5, Sum6, Sum7, Sum8;//Initialise variables
float A = 30f;
float B = 50f;
float C = -1f;
float Zd = 20f;
//float x0 = 60f;
float D = 1f;
int k;
//Loop for calculating fault 1 coordinates
for(k=0;k<=Listric_gui.x_ending;k++){
Listric_gui.x[k] = (float) k;
Sum1 = (Listric_gui.x[k] - A);
Sum2 = ((Sum1/Zd)*C);
Sum3 = D - ((float)Math.exp(Sum2));
Sum4 = (A * Sum3);
Listric_gui.y[k] = Sum4;
if(Listric_gui.x[k]<=30)
Listric_gui.y[k]=0;
Sum1 = (Listric_gui.x[k] - B);
Sum2 = ((Sum1/Zd)*C);
Sum3 = D - ((float)Math.exp(Sum2));
Sum4 = (A * Sum3);
Listric_gui.y2[k] = Sum4;
if(Listric_gui.x[k]<=50)
Listric_gui.y2[k]=0;
System.out.println("x = " + Listric_gui.x[k] + " y = "+ Listric_gui.y[k] + "y2 = " + Listric_gui.y2[k]);
}
//Loop for calculating hangingwall deformation
//Initialise Variables
Listric_gui.hwd [k] = (float) k;
Listric_gui.e1 = 30;
for(k=0;k<=Listric_gui.x_ending;k++){
Listric_gui.hwd[k] = 0f;
if(Listric_gui.x[k]>30)
Listric_gui.hwd[k] = Listric_gui.y[k]-Listric_gui.y[k-Listric_gui.e1];
//System.out.println("x = " + x[k] + " hwd = "+ hwd [k]);
}
//Fault 2 loop
/*for(k=0;k<=Listric_gui.x_ending;k++){
//Listric_gui.x[k] = (float) k;
Listric_gui.y2[k] = (B * (D - ((float)Math.exp((((Listric_gui.x[k] - B)/Zd)*C)))));
if(Listric_gui.x[k]<=50) {
Listric_gui.y2[k]=0;
}
System.out.println("f2x = " + Listric_gui.y2[k]);*/
}
}
//Listener Method
//draw Class
class MyCanvas extends JPanel {
int k, i;
public void paintComponent (Graphics screen) {
super.paintComponent(screen);
Graphics2D screen2D = (Graphics2D) screen;
screen2D.setColor(Color.red);
GeneralPath ln = new GeneralPath();
ln.moveTo(Listric_gui.x_orig,Listric_gui.y_orig);
for(k=0;k<=Listric_gui.x_ending;k++) {
ln.lineTo((Listric_gui.x[k]*Listric_gui.x_scale)+Listric_gui.x_orig,(Listric_gui.y_orig+(Listric_gui.y[k]*Listric_gui.y_scale)));
ln.closePath();
screen2D.fill(ln);
}
GeneralPath ln2 = new GeneralPath();
ln2.moveTo(Listric_gui.x_orig,Listric_gui.hwd_orig);
for(k=0;k<=Listric_gui.x_ending;k++) {
ln2.lineTo((Listric_gui.x[k]*Listric_gui.x_scale)+Listric_gui.x_orig,(Listric_gui.y_orig+(Listric_gui.hwd[k]*Listric_gui.hwd_scale)));
ln2.closePath();
screen2D.fill(ln2);
}
/*GeneralPath ln5 = new GeneralPath();
ln5.moveTo(Listric_gui.x_orig,Listric_gui.hwd_orig);
for(k=0;k<=Listric_gui.x_ending;k++) {
ln5.lineTo((Listric_gui.x[k]*Listric_gui.x_scale)+Listric_gui.x_orig,(Listric_gui.y_orig+(Listric_gui.y2[k]*Listric_gui.hwd_scale)));
ln5.closePath();
//screen2D.fill(ln5);
screen2D.draw(ln5);
}*/
//Fault profile graphically
//x axis
BasicStroke xpen = new BasicStroke(2f, BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND);
screen2D.setStroke(xpen);
screen2D.setFont(new Font("Serif", Font.PLAIN, 11));
screen2D.setColor(Color.black);
GeneralPath xaxis = new GeneralPath();
xaxis.moveTo(Listric_gui.x_orig,(Listric_gui.y_orig+(Listric_gui.y_ending*Listric_gui.y_scale)));
xaxis.lineTo((Listric_gui.x_orig+(Listric_gui.x_ending*Listric_gui.x_scale)),(Listric_gui.y_orig+(Listric_gui.y_ending*Listric_gui.y_scale)));
for (i=0; i <=(Listric_gui.x_ending); i=i+20){
Line2D.Float ticks = new Line2D.Float(((i*Listric_gui.x_scale)+Listric_gui.x_orig), ((Listric_gui.y_orig)+(Listric_gui.y_ending*Listric_gui.y_scale)), ((i*Listric_gui.x_scale)+Listric_gui.x_orig), ((Listric_gui.y_orig+Listric_gui.ticksize)+(Listric_gui.y_ending*Listric_gui.y_scale)));
screen2D.draw(ticks);
screen2D.drawString(""+i, ((i*Listric_gui.x_scale)+Listric_gui.x_orig), ((Listric_gui.y_orig)+(Listric_gui.y_ending*Listric_gui.y_scale))+20);
}
//y axis
BasicStroke ypen = new BasicStroke(2f, BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND);
screen2D.setStroke(ypen);
screen2D.setFont(new Font("Serif", Font.PLAIN, 11));
screen2D.setColor(Color.black);
GeneralPath yaxis = new GeneralPath();
yaxis.moveTo(Listric_gui.x_orig,Listric_gui.y_orig);
yaxis.lineTo(Listric_gui.x_orig,(Listric_gui.y_orig+(Listric_gui.y_ending*Listric_gui.y_scale)));
screen2D.draw(yaxis);
for (i=0; i <=Listric_gui.y_ending; i=i+5){
screen2D.drawString(""+i, ((Listric_gui.x_orig))-15, (Listric_gui.y_orig+(i*Listric_gui.y_scale)));
Line2D.Float yticks = new Line2D.Float(((Listric_gui.x_orig)), (Listric_gui.y_orig+(i*Listric_gui.y_scale)), (((Listric_gui.x_orig+Listric_gui.ticksize))), (Listric_gui.y_orig+(i*Listric_gui.y_scale)));
screen2D.draw(yticks);
}
//Y axis label
screen2D.setFont(new Font("Serif", Font.PLAIN, 14));
screen2D.draw(xaxis);
AffineTransform orig = screen2D.getTransform();
screen2D.drawString("Depth(km)", Listric_gui.x_orig-20, Listric_gui.y_orig-20);
screen2D.rotate(-Math.PI/2);
screen2D.setTransform(orig);
//X axis label
screen2D.setFont(new Font("Serif", Font.PLAIN, 14));
screen2D.drawString("Distance (km)", Listric_gui.x_orig+(Listric_gui.x_ending*Listric_gui.x_scale/2), Listric_gui.y_orig+(Listric_gui.y_ending*Listric_gui.y_scale)+40);
//Values
screen2D.setFont(new Font("Serif", Font.PLAIN, 10));
screen2D.setColor(Color.red);
int y_val = 25;
for (k = 0; k <=160; k=k+5){
screen2D.drawString(" X = " + String.valueOf(Listric_gui.x[k]) + " Y = " + String.valueOf(Listric_gui.y[k]), (Listric_gui.x_orig+(Listric_gui.x_ending*Listric_gui.x_scale)+35), y_val);
y_val = y_val+10;
}
//print screen for hwd values
int y_val2 = 25;
for (k = 0; k <=160; k=k+5){
screen2D.drawString("X = " + String.valueOf(Listric_gui.x [k])+ " Hwd = " + String.valueOf(Listric_gui.hwd[k]),(Listric_gui.x_orig+(Listric_gui.x_ending*Listric_gui.x_scale)+155),y_val2);
y_val2 = y_val2+10;
}
//Title
screen2D.setColor(Color.black);
Font f1 = new Font("Helvetica", Font.BOLD, 24);
screen2D.setFont(f1);
screen2D.drawString("LISTRIC FAULT", (Listric_gui.x_ending*Listric_gui.x_scale/2)+Listric_gui.x_orig,(Listric_gui.y_orig-10));
}
}
}