Question

所以我一直在努力学习挥杆并尝试制作绘画程序。

我一直遇到的问题是，如果你将鼠标移动到快速，它就不会填补空白（如果你不打开则运行代码）

我认为这可能是它填补了arraylist的地方。

所以我想知道如何解决这个问题，谢谢！

我的代码：

    import javax.swing.*;
import java.util.ArrayList;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.MouseAdapter;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
public class Window extends JPanel implements MouseListener{

    //new array list
    private ArrayList<Point> dots; 


static JFrame frame;
Font f;
static int Dx1=0, Dx2=0, Dy1=0, Dy2=0; //fill void dots


static int v=0;
static int posX = 250;
static int posY = 250;
static double winX=0;
static double winY=0;

public Window() {
    dots = new ArrayList<Point>();

    frame = new JFrame();
    f = new Font("Calibri", Font.BOLD, 30);

    this.setBackground(Color.white);

    frame.add(this);
    frame.setResizable(true);
    frame.setVisible(true);
    frame.setSize(500, 500);
    frame.setTitle("Minigameshuehu");

    frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
      // MOVE BALL DEPENDING ON "Dragging"
    this.addMouseListener(this);

     this.addMouseListener(new MouseAdapter() {

     });
     this.addMouseMotionListener(new MouseMotionAdapter() {
         @Override
         public void mouseDragged(MouseEvent e) {

             dots.add(new Point(e.getX(), e.getY()));  // adding pos to to array to make dots
            repaint();
         }
         @Override
        public void mouseMoved(MouseEvent e) {
            posX = e.getX() - 3;
             posY = e.getY() - 3;
             repaint();
        }
     }
     );
     //End of moving ball


}

public void paint(Graphics g) {
    super.paint(g);
    Graphics2D g2 = (Graphics2D) g;
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g2.setColor(new Color(0,0,0));
    g2.fillOval(posX, posY, 6, 6);
}


@Override
public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D) g;
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g2.setColor(Color.black);
    for (Point point : dots) {
        g2.fillOval(point.x-3, point.y-3, 6, 6);
    }
}


    public static void main(String[] args) throws InterruptedException {

        Window applikation = new Window();

    }
    @Override
    public void mouseClicked(MouseEvent e) {
        // TODO Auto-generated method stub

    }
    @Override
    public void mouseEntered(MouseEvent e) {
        // TODO Auto-generated method stub

    }
    @Override
    public void mouseExited(MouseEvent arg0) {
        // TODO Auto-generated method stub

    }
    @Override
    public void mousePressed(MouseEvent e) {
//      posX=(e.getX()-25);
//      posY=(e.getY()-25);
        // TODO Auto-generated method stub
    }

    @Override
    public void mouseReleased(MouseEvent arg0) {
        v=0;
        // TODO Auto-generated method stub

    }

}

Answer 1

如果你将鼠标移动到快速，它就不会填补空白

这是正确的，不会为每个像素生成MouseEvent，因此您无法为生成的每个点绘制一个椭圆。

相反，您需要在ArrayList中的两个点之间绘制一条线。

for (int i = 0; i < dots.size() - 1; i++)
{
    Point p1 = dots.get(i);
    Point p2 = dots.get(i + 1);
    g2.drawLine(...);
}

您还需要使用以下内容更改绘制的线条的大小：

g2.setStroke(new BasicStroke(15, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));

这将绘制一条带有圆边的线条，使其看起来像椭圆形的末端。

Java摇摆。绘画程序。填补空白？

1 个答案: