java - MouseMotionListener 捕获 Point 的速度不够快

Question

我开始了一个学校项目，试图在更大的 JPanel 上绘制 9*9 和 17*17 像素的 JPanel，例如模仿 Gimp 中的钢笔。我尝试使用 MouseClicked 来启动、使用 MouseDragged 来监听并重新绘制()(我希望笔在其中绘制并使用 MouseReleased 来记录的(大)JPanel)来捕获鼠标位置。

问题是 MouseDragged 没有足够地监听鼠标，因此如果我快速移动，我会得到随机点。

这是我的 MVC 模式，Create.java - DrawGame.java - ControleurGame.java

你认为什么是最好的？

package controleur;

import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.util.*;
import java.applet.*;
import java.net.*;
import vue.*;
import vue.Draw.*;
import vue.DrawGame.*;
import modele.*;




/**
*
* @author Yann
*/

public class ControleurGame extends ControleurDraw implements MouseMotionListener {

  int mode;
  Area zone;
  Create draw;

  public ControleurGame (Background bg, JButton[] jip, Utilisateur uti, int n, Area j, Create d) {

    super(bg);
    user = uti;
    butts = jip;
    mode = n;
    zone = j;
    draw = d;

    resume = new JLabel (user.toString());
    resume.setForeground(Color.LIGHT_GRAY);
    resume.setBounds(45,600,256+128,32);
    resume.setVisible(true);

    pan.add(resume);
    pan.add(zone);
    pan.repaint();

  }

  @Override
  public void focusGained (FocusEvent e) {

    if (e.getSource() instanceof JButton) {
      but = (JButton)e.getSource();
      but.setSelected(true);
      pan.repaint();
    }

  }

  @Override
  public void focusLost (FocusEvent e) {

    if (e.getSource() instanceof JButton) {
      but = (JButton)e.getSource();
      but.setSelected(false);
      pan.repaint();
    }

  }

  @Override
  public void keyTyped (KeyEvent e) {

  }

  @Override
  public void keyPressed (KeyEvent e) {

    if (e.getSource() instanceof JButton) {
      if (e.getKeyCode()==KeyEvent.VK_ENTER) {
        but = (JButton)e.getSource();
        but.doClick();
      }
    }
  }

  @Override
  public void keyReleased (KeyEvent e) {

  }

  @Override
  public void actionPerformed(ActionEvent e) {

  }

  @Override
  public void mouseClicked(MouseEvent e) {

  }

  @Override
  public void mousePressed(MouseEvent e) {
    draw.pixels.add(draw.index,new ArrayList<Point>());
    draw.pixels.get(draw.index).add(e.getPoint());
    System.out.println(e.getPoint().toString());
    zone.addP((int)e.getPoint().getX(),(int)e.getPoint().getY());
    pan.repaint();
  }

  @Override
  public void mouseDragged(MouseEvent e) {
    draw.pixels.get(draw.index).add(e.getPoint());
    System.out.println(e.getPoint().toString());
    zone.addP((int)(e.getPoint().getX()),(int)e.getPoint().getY());
    pan.repaint();


  }

  @Override
  public void mouseReleased(MouseEvent e) {
    draw.index++;
  }

  @Override
  public void mouseMoved(MouseEvent e) {
    if (draw.dragging) {

    }
  }

  @Override
  public void mouseEntered(MouseEvent e) {
    pan.repaint();
  }

  @Override
  public void mouseExited(MouseEvent e) {
    if (e.getSource() instanceof JButton){
      but = (JButton)e.getSource();
      but.setSelected(false);
    }

    pan.repaint();
  }

}

创建.java

package modele;

import java.awt.Point;
import java.util.ArrayList;
import javax.swing.JPanel;

/**
*
* @author Matthew
*/

public class Create {

  public static boolean dragging = false;
  public int index = 0;
  public ArrayList<ArrayList<Point>> pixels;

  public Create () {
    pixels = new ArrayList<ArrayList<Point>>();
  }

}

DrawGame.java

package vue;

import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.util.*;
import java.applet.*;
import java.net.*;
import controleur.*;
import modele.*;



/**
*
* @author Yann
*/

public class DrawGame extends Draw {

  int mode = 0;
  Area tableau;
  Create dessin;

  public DrawGame (int n, Utilisateur u) {
    super(n);

    user = u;
    library();
    dessin = new Create();
    try {tableau = new Area();} catch (Exception e) {e.printStackTrace();}

    poulet = new ControleurGame(fond,butts,user,mode,tableau,dessin);

    tableau.addMouseMotionListener(poulet);
    tableau.addMouseListener(poulet);
    fond.add(tableau);
    fond.repaint();

  }

  public class Area extends JPanel {

    BufferedImage bi = ImageIO.read(new File("../src/png/game/01AreaHL.png"));

    public Area () throws IOException {

      this.setLayout(null);
      this.setBounds(10,50,515,450);
      this.setBackground(new Color(0,0,0,0));
    }

    @Override
    protected void paintComponent(Graphics g) {
      super.paintComponent(g);
      g.drawImage(bi, 0, 0, null);
    }

    public void addP (int n, int m) {
      try {this.add(new Pix(n,m));} catch (IOException e) {e.printStackTrace();};
    }

    public class Pix extends JPanel {

      BufferedImage bp;
      Random rand = new Random();

      public Pix (int n, int m) throws IOException {

        try {bp = ImageIO.read(new File("../src/png/game/Points16-2/1602"+rand.nextInt(8)+".png"));} catch (IOException e) {e.printStackTrace();};
        this.setLayout(null);
        this.setBounds(n-8,m-8,17,17);
        this.setBackground(new Color(0,0,0,0));


      }

      @Override
      protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(bp, 0, 0, null);
      }
    }

  }

  public void library() {

    try {icons[0] = ImageIO.read(new File("../src/png/game/00FondGame.png"));}
    catch (IOException e) {e.printStackTrace();}

  }

  public static void main (String[] args){
    DrawGame d = new DrawGame(1, Database.getUser("n0x"));
  }

}

Answer 1

The problem is that the MouseDragged does not listen enough to the mouse so i get random points if i move to fast.

是的，当鼠标快速移动时，你永远无法获得所有的点。

解决方案是更改绘制代码以在两点之间绘制线条。

因此，您需要遍历包含 Points 的 ArrayList。在第一条和第二条之间画一条线，然后在第二条和第三条之间画一条线，依此类推。