display Coordinates of mouse in java
Tue Nov 11, 2008 9:03 pm
draw Coordinates of mouse in java
- Code:
import java.awt.*;
import javax.swing.*;
import java.awt.event.MouseEvent;
import javax.swing.event.MouseInputListener;
public class ShowCoordinates{
private JLabel label;
private Point point1, point2;
private void build(Container cont) {
cont.setLayout(new BoxLayout(cont, BoxLayout.PAGE_AXIS));
CoordinateExample coordinate = new CoordinateExample(this);
cont.add(coordinate);
label = new JLabel();
resetLabel();
cont.add(label);
coordinate.setAlignmentX(Component.RIGHT_ALIGNMENT);
label.setAlignmentX(Component.RIGHT_ALIGNMENT);
}
public void update(int x, int y) {
if (x < 0 ||y < 0) {
point2 = null;
updateLabel();
return;
}
if (point2 == null) {
point2 = new Point();
}
point2.x = x;
point2.y = y;
updateLabel();
}
public void updatePoint1(Point pt) {
point1 = pt;
updateLabel();
}
public void resetLabel() {
point2 = null;
updateLabel();
}
protected void updateLabel() {
String msg = "";
if ((point1 == null) && (point2 == null)) {
msg = "You can move the cursor within the framed region.";
} else {
if (point2 != null) {
msg += "The coordinates are (" + point2.x + ", "
+ point2.y + "). ";
}
}
label.setText(msg);
}
private static void create() {
JFrame f = new JFrame("Show Coordinates");
ShowCoordinates showCoo = new ShowCoordinates();
showCoo.build(f.getContentPane());
f.pack();
f.show();
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
create();
}
});
}
public static class CoordinateExample extends JComponent implements
MouseInputListener {
Point point = null;
ShowCoordinates showCoo;
Dimension dim = new Dimension(450, 100);
Color color;
public CoordinateExample(ShowCoordinates showCoo) {
this.showCoo = showCoo;
addMouseListener(this);
addMouseMotionListener(this);
setBackground(Color.WHITE);
setOpaque(true);
}
public Dimension getPreferredSize() {
return dim;
}
protected void paintComponent(Graphics g) {
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(Color.GRAY);
drawGrid(g, 22);
if (point != null) {
g.setColor(getForeground());
g.fillRect(point.x - 4, point.y - 4, 8, 8);
}
}
private void drawGrid(Graphics g, int grid) {
Insets insets = getInsets();
int X1 = insets.left;
int Y1 = insets.top;
int X2 = getWidth() - insets.right;
int Y2 = getHeight() - insets.bottom;
int x = X1;
while (x < X2) {
g.drawLine(x, Y1, x, Y2);
x += grid;
}
int y = Y1;
while (y < Y2) {
g.drawLine(X1, y, X2, y);
y += grid;
}
}
public void mouseClicked(MouseEvent event) {
int x = event.getX();
int y = event.getY();
if (point == null) {
point = new Point(x, y);
} else {
point.x = x;
point.y = y;
}
showCoo.updatePoint1(point);
repaint();
}
public void mouseMoved(MouseEvent event) {
showCoo.update(event.getX(), event.getY());
}
public void mouseExited(MouseEvent event) {
showCoo.resetLabel();
}
public void mouseReleased(MouseEvent event) {
}
public void mouseEntered(MouseEvent event) {
}
public void mousePressed(MouseEvent event) {
}
public void mouseDragged(MouseEvent event) {
}
}
}
- Attachments
-
- java Coordinates display
- showCoo1.gif (7.54 KiB) Viewed 13375 times
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