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);
}
}
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.
here is the steps to solve this problem
Math.min(x,x2);
Math.abs(x-x2);
code
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);
}
}