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私はJavaで亀のグラフィックスプログラムを作成しようとしています。 JTextFieldを使用してユーザーが入力したコマンドを読み取って2Dグラフィックスを作成できる必要があります。私はGUIを作成し、turnRight、turnLeft、forwardなどの各コマンドごとに異なるメソッドを書いたが、問題は私がJTextField上のアクションリスナーを使ってif/else文を作成したことである。ユーザが与えたコマンドで、そのテキストが受信されたときに書いたメソッドを呼び出そうとしました。それにもかかわらず、プログラムはまだ引き出されず、私は間違っていることを確信しています。どんな助けもありがとう。Java turtle graphicsユーザ入力
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
//Represents the graphics display panel within the turtle program. This panel contains an image which is updated to reflect user commands.
@SuppressWarnings("serial")
public class GraphicPanel extends JPanel
{
private int xPos = 0, yPos=0;
private boolean penUp = true;
private final static int DOWN = 0;
private final static int UP = 1;
private final static int LEFT = 2;
private final static int RIGHT = 3;
private int direction = DOWN;
GraphicPanel() {
setPreferredSize(new Dimension(800, 600));
image = new BufferedImage(700, 600, BufferedImage.TYPE_INT_RGB);
// Set max size of the panel, so that is matches the max size of the image.
setMaximumSize(new Dimension(image.getWidth(), image.getHeight()));
clear();
JTextField console = new JTextField(15);
console.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
if(console.getText().contains("penup")) {
penUp();
}
else if (console.getText().contains("pendown")) {
penDown();
}
else if (console.getText().contains("turnleft")) {
JOptionPane.showMessageDialog(console, "turnleft works");
}
else if (console.getText().contains("turnright")) {
JOptionPane.showMessageDialog(console, "turnright works");
}
else if (console.getText().contains("forward")) {
forward(direction);
}
else if (console.getText().contains("backward")) {
JOptionPane.showMessageDialog(console, "backward works");
}
else if (console.getText().contains("black")) {
JOptionPane.showMessageDialog(console, "black works");
}
else if (console.getText().contains("green")) {
JOptionPane.showMessageDialog(console, "green works");
}
else if (console.getText().contains("red")) {
JOptionPane.showMessageDialog(console, "red works");
}
else if (console.getText().contains("reset")) {
JOptionPane.showMessageDialog(console, "reset works");
}
else {
JOptionPane.showMessageDialog(console, "Invalid command, try again");
}
}
});
add(console);
}
//private JTextField console = new JTextField(15);
//The default BG colour of the image.
private final static Color BACKGROUND_COL = Color.DARK_GRAY;
// The underlying image used for drawing. This is required so any previous drawing activity is persistent on the panel.
private BufferedImage image;
/*
* Draw a line on the image using the given colour.
*
* @param color
* @param x1
* @param y1
* @param x2
* @param y2
*/
// place pen onto canvas
public void penDown()
{
penUp = false;
}
//raise pen from canvas
public void penUp()
{
penUp = true;
}
// turn right from current position
public void turnRight()
{
switch(direction)
{
case UP:
direction = RIGHT;
break;
case DOWN:
direction = LEFT;
break;
case LEFT:
direction = UP;
break;
case RIGHT:
direction = DOWN;
break;
default:
break;
}
}
// turn left from current position
public void turnLeft()
{
switch(direction)
{
case UP:
direction = LEFT;
break;
case DOWN:
direction = RIGHT;
break;
case LEFT:
direction = DOWN;
break;
case RIGHT:
direction = UP;
break;
default:
break;
}
}
// draw forward a certain amount
public void forward(int amount)
{
if(penUp)
return;
if (direction == DOWN)
{
drawLine(Color.red, xPos, yPos, xPos, yPos + amount);
yPos = yPos + amount;
}
else if (direction == UP)
{
drawLine(Color.red, xPos, yPos, xPos, yPos - amount);
yPos = yPos - amount;
}
else if (direction == LEFT)
{
drawLine(Color.red, xPos, yPos, xPos - amount, yPos);
xPos = xPos - amount;
}
else if (direction == RIGHT)
{
drawLine(Color.red, xPos, yPos, xPos + amount, yPos);
xPos = xPos + amount;
}
}
// draw backwards a certain amount
public void backward(int amount)
{
if(penUp)
return;
if (direction == DOWN)
{
drawLine(Color.red, xPos, yPos, xPos, yPos - amount);
yPos = yPos - amount;
}
else if (direction == UP)
{
drawLine(Color.red, xPos, yPos, xPos, yPos + amount);
yPos = yPos + amount;
}
else if (direction == LEFT)
{
drawLine(Color.red, xPos, yPos, xPos + amount, yPos);
xPos = xPos + amount;
}
else if (direction == RIGHT)
{
drawLine(Color.red, xPos, yPos, xPos - amount, yPos);
xPos = xPos - amount;
}
}
// change colour to black
public void black()
{
Graphics g = image.getGraphics();
g.setColor(Color.black);
}
//change colour to green
public void green()
{
Graphics g = image.getGraphics();
g.setColor(Color.green);
}
// change colour to red
public void red()
{
Graphics g = image.getGraphics();
g.setColor(Color.red);
}
// draw lines to xy co-ordinates
public void drawLine(Color color, int x1, int y1, int x2, int y2) {
Graphics g = image.getGraphics();
g.setColor(color);
g.drawLine(x1, y1, x2, y2);
}
//Clears the image contents.
public void clear() {
Graphics g = image.getGraphics();
g.setColor(BACKGROUND_COL);
g.fillRect(0, 0, image.getWidth(), image.getHeight());
}
@Override
public void paint(Graphics g) {
// render the image on the panel.
g.drawImage(image, 0, 0, null);
}
//Constructor.
}
：私がしたものの中には、単なるサンプルコードをスタンドアロンで実行できるようにすることでした。また、 'paint'の代わりに' paintComponent'をオーバーライドしてください。 – Berger
私はrepaint（）とまだ幸運を追加しようとしました – Toby