# How to check whether point that mouse clicked located on the border of rectangle

Suppose I have one rectangle that add to Jpanel. I want to detect when mouse clicked.
That point is located on rectanble border or not. I found only method to check point
containing in rectangle area.
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Commented:
There is no built in method for that. You will have to calculate, in your code, where the boundaries of the rectangle are, and compare them to the coordinates of the mouse activity.
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Commented:
The following code should do (main code adopted from Sun's web site):

MouseEventDemo.java:

/*
* Swing version
*/
import javax.swing.*;
import java.awt.Graphics;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;

public class MouseEventDemo extends JApplet
implements MouseListener {
BlankArea blankArea;
int rectX = 30, rectY = 40, rectWidth = 100, rectHeight=130;
final static String newline = "\n";
public void init() {
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints c = new GridBagConstraints();
JPanel contentPane = new JPanel();
contentPane.setLayout(gridbag);
c.fill = GridBagConstraints.BOTH;
c.gridwidth = GridBagConstraints.REMAINDER;
c.weightx = 1.0;
c.weighty = 1.0;
c.insets = new Insets(1, 1, 1, 1);
blankArea = new BlankArea(new Color(0.98f, 0.97f, 0.85f));
gridbag.setConstraints(blankArea, c);
c.insets = new Insets(0, 0, 0, 0);

//Register for mouse events on blankArea and applet.
setContentPane(contentPane);
}

public void paint(Graphics g)
{
g.drawRect(rectX, rectY, rectWidth, rectHeight);
}

public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mouseClicked(MouseEvent e) {
System.out.println("mouse clicked at x: " + e.getX() + " and y: " + e.getY());
if ( (e.getX() % rectX == 0) || (e.getY() % rectY == 0) ||
(e.getY() % (rectY + rectHeight) == 0) || (e.getX() % (rectX + rectWidth) == 0) )
System.out.println("Clicked on border.");
}
}

BlankArea.java:

/*
* Swing version
*/
import javax.swing.*;
import java.awt.Dimension;
import java.awt.Color;
import java.awt.Graphics;
public class BlankArea extends JLabel {
Dimension minSize = new Dimension(100, 100);
public BlankArea(Color color) {
setBackground(color);
setOpaque(true);
setBorder(BorderFactory.createLineBorder(Color.black));
}
public Dimension getMinimumSize() {
return minSize;
}
public Dimension getPreferredSize() {
return minSize;
}
}

Hope it helps.
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Commented:
Basicalyl a good solution is to have it in a method, lets say, borderClicked that returns true or false and according to output you can do things:

public void mouseClicked(MouseEvent e) {
if (borderClicked(e))
// do something
else
// do something else.
}

public boolean borderClicked(MouseEvent e)
{
if ( (e.getX() % rectX == 0) || (e.getY() % rectY == 0) ||
(e.getY() % (rectY + rectHeight) == 0) || (e.getX() % (rectX + rectWidth) == 0) )
return true

return false;
}
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Commented:
if you can check whether a click is in a rectangle or not, just test whether the click is inside the rectangle and NOT inside a slightly smaller rectangle.

Where the "slightly" is the border width of your rectangle.

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Commented:
Any luck with any of the suggestions provided?
0
Commented:
kingkarn:
EXPERTS:
Post your closing recommendations!  No comment means you don't care.
0
Commented:
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

Split between imladris, girionis and wide_awake.

jimmack
EE Cleanup Volunteer
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