我想知道任何人都可以帮助我使用旋转方法，我查看了以前的问题并没有找到我要找的东西..
代码已经被压缩，所以一些元素可能会丢失.. 屏幕截图如下。
我目前在要旋转的行变量中加减 10 谁能帮我使用实际的旋转方法，，
提前致谢..
公共(public)类 Display 扩展 JFrame{
private int Lx1 = CANVAS_WIDTH / 2; private int Mx1 = CANVAS_WIDTH / 2;
private int Ly1 = CANVAS_HEIGHT / 2; private int My1 = CANVAS_HEIGHT / 2;
private int Lx2 = CANVAS_WIDTH / 2; private int Mx2 = CANVAS_WIDTH / 2;
private int Ly2 = CANVAS_HEIGHT / 2; private int My2 = CANVAS_HEIGHT;
public Display() {
canvas = new DrawCanvas();
canvas.setPreferredSize(new Dimension(CANVAS_WIDTH, CANVAS_HEIGHT));
canvas.setLayout(new GridLayout(8, 4, 80, 10));
canvas.setComponentOrientation(ComponentOrientation.UNKNOWN);
Container cp = getContentPane();
cp.setLayout(new BorderLayout());
Altitude = new JTextField("Altitude", 5); Altitude.setHorizontalAlignment(JTextField.CENTER);
Altitude.setEditable(false); Altitude.setOpaque(false);
Altitude.setFont(Altitude.getFont().deriveFont(25f)); Altitude.setForeground(Color.WHITE);
TASpeed = new JTextField("TAs", 5); TASpeed.setHorizontalAlignment(JTextField.CENTER);
TASpeed.setEditable(false); TASpeed.setOpaque(false);
TASpeed.setFont(TASpeed.getFont().deriveFont(25f)); TASpeed.setForeground(Color.WHITE);
TargetAlt = new JTextField("Taralt", 5); TargetAlt.setHorizontalAlignment(JTextField.CENTER);
TargetAlt.setEditable(false); TargetAlt.setOpaque(false);
TargetAlt.setFont(TargetAlt.getFont().deriveFont(25f)); TargetAlt.setForeground(Color.WHITE);
TargetSpeed = new JTextField("TArsp", 5); TargetSpeed.setHorizontalAlignment(JTextField.CENTER);
TargetSpeed.setEditable(false); TargetSpeed.setOpaque(false);
TargetSpeed.setFont(TASpeed.getFont().deriveFont(25f)); TargetSpeed.setForeground(Color.WHITE);
BaroCorrectUp = new JTextField("BaroCorU", 5); BaroCorrectUp.setHorizontalAlignment(JTextField.CENTER);
BaroCorrectUp.setEditable(false); BaroCorrectUp.setOpaque(false);
BaroCorrectUp.setFont(BaroCorrectUp.getFont().deriveFont(25f)); BaroCorrectUp.setForeground(Color.WHITE);
BaroCorrectDown = new JTextField("BaroCorD", 5); BaroCorrectDown.setHorizontalAlignment(JTextField.CENTER);
BaroCorrectDown.setEditable(false); BaroCorrectDown.setOpaque(false);
BaroCorrectDown.setFont(BaroCorrectUp.getFont().deriveFont(25f)); BaroCorrectDown.setForeground(Color.WHITE);
WindDir = new JTextField("Wind dir", 5); WindDir.setHorizontalAlignment(JTextField.CENTER);
WindDir.setEditable(false); WindDir.setOpaque(false);
WindDir.setFont(WindDir.getFont().deriveFont(25f)); WindDir.setForeground(Color.WHITE);
EquivSpeed = new JTextField("EquivSpe", 5); EquivSpeed.setHorizontalAlignment(JTextField.CENTER);
addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent evt) {
switch(evt.getKeyCode()) {
case KeyEvent.VK_LEFT:
Rx1 -= 10; Ry1 += 10; Rx2 += 10; Ry2 -= 10;
x1 -=10; x2 +=10; Mx1 += 10; Mx2 -= 10;
repaint();
break;
case KeyEvent.VK_RIGHT:
Rx1 -= 10; Ry1 -= 10; Rx2 += 10; Ry2 += 10;
x1 += 10; x2 += 10; Mx1 -= 10; Mx2 += 10;
repaint();
break;
case KeyEvent.VK_DOWN:
y1 -= 10; y2 -= 10; Ly1 -= 10; Ly2 -= 10;
Sy1 += 10; Sy2 -= 10; Ry1 +=10; Ry2 += 10;
repaint();
break;
case KeyEvent.VK_UP:
y1 += 10; y2 += 10; Ly1 += 10; Ly2 += 10;
Sy1 -= 10; Sy2 += 10; Ry1 -= 10; Ry2 -= 10;
repaint();
break;
case KeyEvent.VK_M:
System.exit(0);
break;
case KeyEvent.VK_4:
countAd++;
BaroCorrectDown.setText(countAd + "");
repaint();
break;
case KeyEvent.VK_3:
countAu++;
BaroCorrectUp.setText(countAu + "");
repaint();
break;
}
}
});
cp.add(canvas);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(CANVAS_WIDTH / 3, CANVAS_HEIGHT / 4, CANVAS_WIDTH, CANVAS_HEIGHT);
setTitle("FLIGHT DISPLAY"); pack();
setVisible(true); requestFocus();
}
class DrawCanvas extends JPanel {
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
setBackground(CANVAS_BACKGROUND);
g.setColor(GROUND_COLOR);
//Draw ground Color
g.drawRect(Sx1 - Sx1,Sy1 /2, CANVAS_WIDTH, Sy2 /2);
g.fillRect(Sx1 - Sx1, Sy1 /2, CANVAS_WIDTH, Sy2 /2);
g.setColor(LINE_COLOR);
//Draw line centre horizontal
g.drawLine(Rx1, Ry1 /2, Rx2, Ry2 /2);
g.drawOval(x1 -15, y1 -15, 30, 30);
//Draw line dim
g.setColor(Color.YELLOW);
g.fillArc(CANVAS_WIDTH /2 -150, 10, 300, 170, 30, 120);
g.setColor(LINE_COLOR);
//Draw polyline centre plane
g.setColor(Color.YELLOW);
g.drawPolyline(xs, ys, 10);
g.fillPolygon(new Polygon(
new int[]{470, 350, 230, 350, 470},
new int[]{260, 205, 260, 225, 260},5));
g.setColor(Color.CYAN);
g.setColor(Color.BLACK);
g.drawArc(CANVAS_WIDTH / 2 -150, 10, 300, 170, 30, 120);
g.drawArc(CANVAS_WIDTH / 2 -150, 11, 300, 170, 30, 120);
g.setColor(CANVAS_BACKGROUND);
g.fillRect(0, 60, CANVAS_WIDTH, 50);
Color DarkTRANS = new Color(0.0f, 0.0f, 0.0f, 1.0f);
g.setColor(DarkTRANS);
g.fillRect(0, 400, CANVAS_WIDTH, 50);
g.fillRect(0, 345, 115, 55);
g.fillRect(585, 345, 115, 55);
g.setColor(LINE_COLOR);
g.drawLine(Lx1 -50, Ly1 -120, Lx2 +50, Ly2 -120);
g.drawLine(Lx1 -25, Ly1 -140, Lx2 +25, Ly2 -140);
g.drawLine(Lx1 -75, Ly1 -160, Lx2 +75, Ly2 -160);
g.drawLine(Lx1 -25, Ly1 +20, Lx2 +25, Ly2 +20);
g.drawLine(Lx1 -50, Ly1 +40, Lx2 +50, Ly2 +40);
g.drawLine(Lx1 -25, Ly1 +60, Lx2 +25, Ly2 +60);
g.drawLine(Lx1 -75, Ly1 +80, Lx2 +75, Ly2 +80);
g.drawLine(Lx1 -25, Ly1 +100, Lx2 +25, Ly2 +100);
g.drawLine(Lx1 -50, Ly1 +120, Lx2 +50, Ly2 +120);
//Draw line dim
g.drawLine(Lx1 -25, Ly1 -20, Lx2 +25, Ly2 -20);
g.drawLine(Lx1 -50, Ly1 -40, Lx2 +50, Ly2 -40);
g.drawLine(Lx1 -25, Ly1 -60, Lx2 +25, Ly2 -60);
g.drawLine(Lx1 -75, Ly1 -80, Lx2 +75, Ly2 -80);
g.drawLine(Lx1 -25, Ly1 -100, Lx2 +25, Ly2 -100);
//bottom triangles
g.setColor(DarkTRANS);
g.fillPolygon(new Polygon(
new int[]{115, 115, 200},
new int[]{400, 345, 400},3));
g.fillPolygon(new Polygon(
new int[]{585, 585, 500},
new int[]{400, 345, 400},3));
//top button triangle/shapes
g.fillPolygon(new Polygon(
new int[]{0, 200, 115, 0,},
new int[]{0, 0, 50, 50},4));
g.fillPolygon(new Polygon(
new int[]{500, 700, 700, 585,},
new int[]{0, 0, 50, 50},4));
//middle button shapes
g.fillPolygon(new Polygon(
new int[]{0, 100, 100, 117, 117, 130, 117, 117, 100, 100, 0},
new int[]{174, 174, 159, 159, 187, 197, 207, 235, 235, 220, 220},11));
//right hand shape
g.fillPolygon(new Polygon(
new int[]{700, 600, 600, 583, 583, 570, 583, 583, 600, 600, 700},
new int[]{174, 174, 159, 159, 187, 197, 207, 235, 235, 220, 220},11));
Color TRANS = new Color(0.0f, 0.0f, 0.0f, 0.35f);
g.setColor(TRANS);
g.fillRect(0, 0, 115, CANVAS_HEIGHT);
g.fillRect(585, 0, 115, CANVAS_HEIGHT);
g.setColor(LINE_COLOR);
g.drawLine(Mx1+20, My1 + My1, Mx2, My2-440);
g.drawLine(Mx1-20, My1 + My1, Mx2, My2-440);
g.drawLine(Mx1, My1 + My1, Mx2, My2-440);
g.drawString("10", Lx1 -90, Ly1 -75);
g.drawString("10", Lx1 +77, Ly1 -75);
g.drawString("10", Lx1 -90, Ly1 +85);
g.drawString("10", Lx1 +77, Ly1 +85);
g.drawString("20", Lx1 +77, Ly1 -155);
g.drawString("20", Lx1 -90, Ly1 -155);
g.drawString("Press alt + 3(U), 4(D)\n" , 582, 305);
g.drawString("To Initialize" , 595, 315);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new Display();
}
});
}
}
最佳答案
LinePanel 的变体可能会建议一种方法。
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
/**
* @see https://stackoverflow.com/a/15027637/230513
* @see https://stackoverflow.com/questions/6991648
* @see https://stackoverflow.com/questions/6887296
* @see https://stackoverflow.com/a/5797965/230513
*/
public class LinePanel extends JPanel {
private Point p1 = new Point(320, 100);
private Point p2 = new Point(320, 380);
private boolean drawing;
@Override
public Dimension getPreferredSize() {
return new Dimension(640, 480);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setColor(Color.blue);
g2d.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setStroke(new BasicStroke(8,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL));
g.drawLine(p1.x, p1.y, p2.x, p2.y);
}
private class ControlPanel extends JPanel {
private static final int DELTA = 10;
public ControlPanel() {
this.add(new MoveButton("\u21BA", KeyEvent.VK_LEFT, DELTA, 0));
this.add(new MoveButton("\u21BB", KeyEvent.VK_RIGHT, -DELTA, 0));
}
private class MoveButton extends JButton {
KeyStroke k;
int dx, dy;
public MoveButton(String name, int code, final int dx, final int dy) {
super(name);
this.k = KeyStroke.getKeyStroke(code, 0);
this.dx = dx;
this.dy = dy;
this.setAction(new AbstractAction(this.getText()) {
@Override
public void actionPerformed(ActionEvent e) {
LinePanel.this.p1.translate(-dx, 0);
LinePanel.this.p2.translate(dx, 0);
LinePanel.this.repaint();
}
});
ControlPanel.this.getInputMap(
WHEN_IN_FOCUSED_WINDOW).put(k, k.toString());
ControlPanel.this.getActionMap().put(k.toString(), new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
MoveButton.this.doClick();
}
});
}
}
}
private void display() {
JFrame f = new JFrame("LinePanel");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(this);
f.add(new ControlPanel(), BorderLayout.SOUTH);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new LinePanel().display();
}
});
}
}
关于java - 如何在按键java swing上旋转一条线，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15008761/