我是 Java swing 桌面图形应用程序的新手 我遇到问题请建议我需要选择一些矩形并用我们是否有任何预定义的概念来填充矩形如果有的话请建议我开始绘图
import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Stroke;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.util.ArrayList;
import javax.swing.JFrame;
import javax.swing.JPanel;
@SuppressWarnings("serial")
public class Exam extends JPanel implements MouseMotionListener {
private static final int recW = 50;
private static final int MAX = 100;
private Rectangle[] rect = new Rectangle[MAX];
private int numOfRecs = 0;
private int currentSquareIndex = -1;
private Point startPoint = new Point();
private Point currentPoint = new Point();
private int x, y, width, height;
private Stroke dashedStroke = new BasicStroke(0.0f, BasicStroke.CAP_ROUND,
BasicStroke.CAP_SQUARE, 5.0f, new float[] { 5f, 5f, 5f, 5f }, 5.0f);
ArrayList list = new ArrayList();
public Exam() {
addRect(50, 50);
addRect(100, 50);
addRect(150, 50);
addRect(200, 50);
addRect(250, 50);
addRect(300, 50);
addRect(350, 50);
addRect(400, 50);
addRect(450, 50);
addRect(500, 50);
//
addRect(50, 100);
addRect(100, 100);
addRect(150, 100);
addRect(200, 100);
addRect(250, 100);
addRect(300, 100);
addRect(350, 100);
addRect(400, 100);
addRect(450, 100);
addRect(500, 100);
//
addRect(50, 150);
addRect(100, 150);
addRect(150, 150);
addRect(200, 150);
addRect(250, 150);
addRect(300, 150);
addRect(350, 150);
addRect(400, 150);
addRect(450, 150);
addRect(500, 150);
//
addRect(50, 200);
addRect(100, 200);
addRect(150, 200);
addRect(200, 200);
addRect(250, 200);
addRect(300, 200);
addRect(350, 200);
addRect(400, 200);
addRect(450, 200);
addRect(500, 200);
addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent evt) {
startPoint = evt.getPoint();
}
public void mouseReleased(MouseEvent e) {
System.out.println(" mouseReleased is " + e.getX() + " y i s "
+ e.getY());
Graphics g = getGraphics();
Graphics2D g2 = (Graphics2D) g;
g2.setComposite(AlphaComposite.SrcOver.derive(0.8f));
Color myColour = new Color(255, 0, 0);
g.setColor(myColour);
x = Math.min(startPoint.x, currentPoint.x);
y = Math.min(startPoint.y, currentPoint.y);
width = Math.abs(startPoint.x - currentPoint.x);
height = Math.abs(startPoint.y - currentPoint.y);
rect[numOfRecs] = new Rectangle(x, y, width, height);
// System.out.println("list size is:"+list.size());
Rectangle ggg=new Rectangle(x, y, width, height);
for(Rectangle rect3d: rect){
if(ggg.intersects(rect3d)){
g2.fill(rect3d);
}
else
System.out.println("doesn't contains");
}
repaint();
}
});
addMouseMotionListener(this);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
for (int i = 0; i < numOfRecs; i++) {
((Graphics2D) g).draw(rect[i]);
list.add(rect[i]);
}
x = Math.min(startPoint.x, currentPoint.x);
y = Math.min(startPoint.y, currentPoint.y);
width = Math.abs(startPoint.x - currentPoint.x);
height = Math.abs(startPoint.y - currentPoint.y);
((Graphics2D) g).setStroke(dashedStroke);
g.setColor(Color.BLACK);
g.drawRect(x, y, width, height);
// Rectangle dashedRec=new Rectangle(x, y, width, height);
}
public void addRect(int x, int y) {
if (numOfRecs < MAX) {
rect[numOfRecs] = new Rectangle(x, y, recW, recW);
currentSquareIndex = numOfRecs;
numOfRecs++;
repaint();
}
}
@Override
public void mouseMoved(MouseEvent event) {
}
@Override
public void mouseDragged(MouseEvent event) {
currentPoint = event.getPoint();
repaint();
}
public static void main(String[] args) {
JFrame jFrame = new JFrame();
jFrame.setTitle("");
jFrame.setSize(600, 300);
Container cPane = jFrame.getContentPane();
cPane.add(new Exam());
jFrame.setVisible(true);
}
}
