Java 在此处更改随机绘制线,以进行mouseListener绘制
我正在做一个“画画”项目。到目前为止,我有一个GUI,有一个按钮“Ligne”和一个可绘制的面板。在我的类Paint_Dessin中,有一个方法调用TracerLigne()。这种方法画出了一条随机模式的直线。我想做的是放一个鼠标听筒,让x1,y1=点击1,x2,y2=点击2。这是我的密码。谢谢(对法国的评论感到抱歉)Java 在此处更改随机绘制线,以进行mouseListener绘制,java,swing,mouseevent,mouselistener,Java,Swing,Mouseevent,Mouselistener,我正在做一个“画画”项目。到目前为止,我有一个GUI,有一个按钮“Ligne”和一个可绘制的面板。在我的类Paint_Dessin中,有一个方法调用TracerLigne()。这种方法画出了一条随机模式的直线。我想做的是放一个鼠标听筒,让x1,y1=点击1,x2,y2=点击2。这是我的密码。谢谢(对法国的评论感到抱歉) 为了实现这一点,您需要在您的绘画JPanel中添加一个MouseListener(并且可以在扩展MouseAdapter的单个类中进行编码)。然后重写mousePressed
为了实现这一点,您需要在您的绘画JPanel中添加一个MouseListener(并且可以在扩展MouseAdapter的单个类中进行编码)。然后重写mousePressed和MouseRelease(如果需要这些方法),并在这些方法中从传递给它的MouseEvent对象获取鼠标位置点。然后,您将使用点的值在BuffereImage中绘制一条线。我的猜测是,你会想得到鼠标按下的起点和鼠标松开的终点,然后在鼠标松开后在缓冲区中画线。如果需要在mouseDragged上动态绘制线,则需要一个MouseMotionListener(同样,上面的MouseAdapter类也适用于此) 查看教程以获得优秀的示例代码和说明: 执行此操作的半伪代码如下所示:
// assuming a private inner class
private class MyMouseAdapter extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
// get your starting point from e, the MouseEvent and store it in variable
}
@Override
public void mouseReleased(MouseEvent e) {
// get your end point from e, the MouseEvent
// get the Graphics object from the BufferedImage
// set the color
// set rendering hints for antialiasing if desired
// draw your line using the starting and end points
// **** dispose your graphics object **** don't forget!
// repaint your JPanel
}
}
我澄清了你的问题。下次请发布格式正确的源代码。粘贴代码时,在窗口中选择它并点击代码按钮(二进制图标)。它会将其缩进四个空格,导致页面将其呈现为源代码。
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class Paint_GUI extends JFrame {
//Panels contenant tout les bouton de mon interface
private JPanel panelBtn;
//Bar d'outil Btn
private JButton BtnTracerLigne;
//créer l'objet Paint_Dessin
private Paint_Dessin espaceDessin = new Paint_Dessin();
public Paint_GUI() {
final int WINDOW_WIDTH = 650;
final int WINDOW_HEIGHT = 450;
setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
setTitle("Paint v.2.0");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
// Appeler la methode qui construit la barre de BTN.
buildPanelBtn();
add(panelBtn, BorderLayout.NORTH);
add(espaceDessin, BorderLayout.CENTER);
// Afficher la fenetre.
setVisible(true);
}
private void buildPanelBtn() {
BtnTracerLigne = new JButton("Ligne");
BtnTracerLigne.addActionListener(new LigneListener());
// Creer le panel.
panelBtn = new JPanel();
// Ajouter les composantes au label
panelBtn.add(BtnTracerLigne);
}
private class LigneListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
espaceDessin.TracerLigne();
}
}
}
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
import java.util.*;
import java.awt.image.*;
class Paint_Dessin extends JPanel {
private static final long serialVersionUID = -2110723486099015303L;
private static final Random RAND = new Random();
private BufferedImage buffer = null;
@Override
public void paintComponent(final Graphics g) {
final Graphics2D g2 = (Graphics2D) g;
g2.clearRect(0, 0, getWidth(), getHeight()); // cleanup du composant
g2.drawImage(getBuffer(), null, 0, 0);
}
public void TracerLigne() {
final Graphics2D g2 = getBuffer().createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(Color.BLACK);
// dessin la ligne au pif dans l'espace visible
final int x1 = RAND.nextInt(500); // position en X1
final int y1 = RAND.nextInt(500); // position en Y1
final int x2 = RAND.nextInt(500); // position en X2
final int y2 = RAND.nextInt(500); // position en Y2
g2.drawLine(x1, y1, x2, y2);
Line2D.Double line = new Line2D.Double(x1, y1, x2, y2);
g2.fill(line);
repaint();
}
private BufferedImage getBuffer() {
if (buffer == null) {
buffer = new BufferedImage(getWidth(), getHeight(),
BufferedImage.TYPE_INT_ARGB);
}
return buffer;
}
}
// assuming a private inner class
private class MyMouseAdapter extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
// get your starting point from e, the MouseEvent and store it in variable
}
@Override
public void mouseReleased(MouseEvent e) {
// get your end point from e, the MouseEvent
// get the Graphics object from the BufferedImage
// set the color
// set rendering hints for antialiasing if desired
// draw your line using the starting and end points
// **** dispose your graphics object **** don't forget!
// repaint your JPanel
}
}