我是一名高中生,我正在为我的计算机科学课的最终项目工作。我的任务是制作一个简单的绘画应用程序,但是我遇到了一些问题。这些包括:当窗口大小调整时,被绘制的图像被擦除,并且我可以在窗口中绘制菜单。JFrame菜单正在绘制完毕,图形在JFrame上消失调整大小
我相信我正在绘制菜单,因为我正在使用JFrame本身的图形对象。但是我找不到任何替代品。我试图制作单独的组件,甚至使用BufferedImage,但我的尝试都没有成功。
这里是我的代码:
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import javax.swing.*;
public class Paint implements MouseMotionListener{
private JFrame window;
private drawingComponent pComp;
private int xPos; //xPos of mouse;
private int yPos; //yPos of mouse;
private Color color; // new color
private JTextArea sizeBox;
private int brushShape = 0;
public static void main(String[] args) {
Paint paint = new Paint();
paint.ImplementGUI();
}
public Paint() {
this.pComp = new drawingComponent();
this.window = new JFrame("JPaint");
this.window.setSize(500, 500);
this.window.setVisible(true);
this.window.addMouseMotionListener(this);
this.window.add(this.pComp);
}
public void ImplementGUI() {
JMenuBar menu = new JMenuBar();
JMenu brush = new JMenu("Brush Settings");
JMenu brushShape = new JMenu("Shape");
brush.setSize(100,100);
brush.add(brushShape);
menu.add(brush);
menu.setSize(window.getWidth(), 20);
menu.setVisible(true);
this.sizeBox = new JTextArea("Brush Size:");
this.sizeBox.setText("20");
brush.add(this.sizeBox);
this.window.setJMenuBar(menu);
}
public void mouseDragged(MouseEvent pMouse) {
if (pMouse.isShiftDown() == true) {
this.pComp.paint(this.window.getGraphics(), pMouse.getX(), pMouse.getY(),
window.getBackground(), Integer.parseInt(sizeBox.getText()));
}
else {
this.pComp.paint(this.window.getGraphics(), pMouse.getX(), pMouse.getY(),
color, Integer.parseInt(sizeBox.getText()));
}
}
public void mouseMoved(MouseEvent pMouse) {
}
}
class drawingComponent extends JComponent {
public void paint(Graphics g, int x, int y, Color color, int size) {
g.setColor(color);
g.fillOval(x-(size/2), y-(size/2), size, size); // 10 is subtracted from
// coordinates so the mouse pointer is at the exact middle of the brush.
}
}
我怎样才能解决这个问题?