Java Swing在鼠标拖放中绘制矩形

问题描述：

我正在创建一个矩形绘图程序.只有当程序拖到底部时才会绘制正方形.即使向另一个方向拖动，我也想确保正确绘制正方形.我该如何解决?请帮帮我.

I am creating a rectangular drawing program.The square is drawn only if the program is dragging to the bottom side. Even if dragging in the other direction, I want to ensure that squares are drawn correctly. How can I fix it? Please help me.

**DrawRect.java**


    import javax.swing.*;

    import java.awt.*;

    import java.awt.event.*;

    public class DrawRect extends JPanel {

        int x, y, w, h;
        public static void main(String [] args) { 
            JFrame f = new JFrame("Draw Box Mouse 2");
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
            f.setContentPane(new DrawRect());
            f.setSize(300, 300); f.setVisible(true);
        }



        DrawRect() { 
            x = y = w = h = 0; // 
            MyMouseListener listener = new MyMouseListener(); 
            addMouseListener(listener); 
            addMouseMotionListener(listener);    
        }

        public void setStartPoint(int x, int y) {
            this.x = x; this.y = y;
        }

        public void setEndPoint(int x, int y) { 
            w = Math.abs(this.x - x); 
            h = Math.abs(this.y - y); 
        }

        class MyMouseListener extends MouseAdapter {
            public void mousePressed(MouseEvent e) {
                setStartPoint(e.getX(), e.getY());
            } 
            public void mouseDragged(MouseEvent e) { 
                setEndPoint(e.getX(), e.getY()); repaint(); 
            } 
            public void mouseReleased(MouseEvent e) {
                setEndPoint(e.getX(), e.getY()); repaint(); 
            } 
        }

        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.setColor(Color.RED); 

Please help me.
            g.drawRect(x, y, w, h); 

        }



    }

答

尝试这样的事情.您必须仔细确定起点.起点是第一个和最后一个鼠标坐标的最小 x 和 y 点.

Try something like this. you have to determine start point carefully.start point is the min x and y points of 1st and last mouse coordinates.

这里是解决这个问题的步骤

here is the steps to solve this problem

鼠标点击 x,y 时取第一个坐标
鼠标拖动 x2,y2 时取最后一个坐标
以最小 x 和 y 坐标作为 drawRect 的起点 Math.min(x,x2);
使用坐标差的绝对值来计算矩形的高度和宽度.Math.abs(x-x2);

代码

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

    public class DrawRect extends JPanel {

        int x, y, x2, y2;

        public static void main(String[] args) {
            JFrame f = new JFrame("Draw Box Mouse 2");
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.setContentPane(new DrawRect());
            f.setSize(300, 300);
            f.setVisible(true);
        }

        DrawRect() {
            x = y = x2 = y2 = 0; // 
            MyMouseListener listener = new MyMouseListener();
            addMouseListener(listener);
            addMouseMotionListener(listener);
        }

        public void setStartPoint(int x, int y) {
            this.x = x;
            this.y = y;
        }

        public void setEndPoint(int x, int y) {
            x2 = (x);
            y2 = (y);
        }

        public void drawPerfectRect(Graphics g, int x, int y, int x2, int y2) {
            int px = Math.min(x,x2);
            int py = Math.min(y,y2);
            int pw=Math.abs(x-x2);
            int ph=Math.abs(y-y2);
            g.drawRect(px, py, pw, ph);
        }

        class MyMouseListener extends MouseAdapter {

            public void mousePressed(MouseEvent e) {
                setStartPoint(e.getX(), e.getY());
            }

            public void mouseDragged(MouseEvent e) {
                setEndPoint(e.getX(), e.getY());
                repaint();
            }

            public void mouseReleased(MouseEvent e) {
                setEndPoint(e.getX(), e.getY());
                repaint();
            }
        }

        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.setColor(Color.RED);
            drawPerfectRect(g, x, y, x2, y2);
        }

    }

Java Swing在鼠标拖放中绘制矩形

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