Interactive graphics - An Introduction to Graphical User Interfaces with Java Swing - page 71

40.

public void setCoordinates( int x, int y){

41.

XCoord.setText(""+x);

42.

YCoord.setText(""+y);

43.

}

44.
45.

public void setInOut(String str){

46.

inOut.setText(str);

47.

}

48.
49. public void incrementClickCount(){

50.

clickCount++;

51.

counts.setText(Integer.toString(clickCount));

52.

}

53.
54.

public void setNoOfCircles( int n){

noOfCirc.setText(Integer.toString(n)); 55.

} 56.

} 57.

7.4

■

The control part

Of the two listeners only MyMouseListener is changed by adding more commands
to method mouseClicked . Depending on whether the left or right button was
pressed a circle is added using the methods addCircle(e.getX(),e.getY()) or
deleted using removeNearestCircle(e.getX(),e.getY()) of class Interactive
Panel . The information about which mouse button was clicked is extracted from
the MouseEvent object e using methods from the class SwingUtilities .Ifamouse
has three or more buttons, any button that is not the left one is considered as a
right button. In any case the number of circles is updated using

[StatusPanel].setNoOfCircles([InteractivePanel].getNoOfCircles())

The texts in brackets have to be replaced by the appropriate variable names with-
out brackets. In order for the listener to have access to that panel the constructor
of MyMouseListener now receives a reference to the interactive panel.

File: its/InteractiveGraphic/MyMouseListener.java

package its.InteractiveGraphic; 1.

2.
3.

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener; 4.

import javax.swing.SwingUtilities; 5.

6.