Java provides different functions by which we can control the translucency of the window or the frame. To control the opacity of the frame must not be decorated. Opacity of a frame is the measure of the translucency of the frame or component.
In Java, we can create shaped windows by two ways first by using the AWTUtilities which is a part of com.sum.awt package AWTUtilities class have a function – setWindowShape(Window w, Shape s) which sets the shape of the window and second by using setShape(Shape s) which sets the shape of the window to the specified shape.
In this article we will discuss about uniform translucency of window.
Methods used :
- setWindowShape(Window w, Shape s) : sets the shape of the window w to the specified shape s
- setShape(Shape s) : sets the shape of the window to the specified shape s
- setOpacity(float f) : sets the value of opacity of the frame
1. Program to create a translucent frame and control its translucency with the help of a JSlider
Java
// Java program to create a// translucent frame and control// its translucency with// the help of a JSliderimport javax.swing.event.*;import java.awt.*;import javax.swing.*;class solveit extends JFrame implements ChangeListener { // frame static JFrame f; // slider static JSlider b; // label static JLabel l; // main class public static void main(String[] args) { // create a new frame f = new JFrame("translucent window"); // create a object solveit s = new solveit(); // create label l = new JLabel(); // create a panel JPanel p = new JPanel(); // create a slider b = new JSlider(0, 100, 100); // paint the ticks and tracks b.setPaintTrack(true); b.setPaintTicks(true); b.setPaintLabels(true); // set spacing b.setMajorTickSpacing(20); b.setMinorTickSpacing(5); // setChangeListener b.addChangeListener(s); // add slider to panel p.add(b); p.add(l); f.add(p); // set the text of label l.setText("Opacity value is =" + b.getValue()); // set the size of frame f.setSize(300, 300); // decorated frame's opacity cant be set // so make the frame undecorated f.setUndecorated(true); // set opacity value for the window f.setOpacity(b.getValue() * 0.01f); f.setLocation(500, 300); f.show(); } // if opacity value is changed public void stateChanged(ChangeEvent e) { l.setText("opacity value is =" + b.getValue()); // set opacity value for the window f.setOpacity(b.getValue() * 0.01f); }} |
Output :
2. Program to create a shaped translucent window (using AWTUtilities)and control its translucency using a slider
Java
// Java Program to create a shaped translucent// window (using AWTUtilities)and// control its translucency using a sliderimport javax.swing.event.*;import java.awt.*;import javax.swing.*;import java.awt.geom.*;import com.sun.awt.AWTUtilities;class solveit extends JFrame implements ChangeListener { // frame static JFrame f; // slider static JSlider b; // label static JLabel l; // main class public static void main(String[] args) { // create a new frame f = new JFrame("translucent window"); // create a object solveit s = new solveit(); // create label l = new JLabel(); // create a panel JPanel p = new JPanel(); // create a slider b = new JSlider(0, 100, 100); // paint the ticks and tracks b.setPaintTrack(true); b.setPaintTicks(true); b.setPaintLabels(true); // set spacing b.setMajorTickSpacing(20); b.setMinorTickSpacing(5); // setChangeListener b.addChangeListener(s); // add slider to panel p.add(b); p.add(l); f.add(p); // set the text of label l.setText("Opacity value is =" + b.getValue()); // set the size of frame f.setSize(300, 300); // decorated frame's opacity cant be set so make the frame undecorated f.setUndecorated(true); // set opacity value for the window f.setOpacity(b.getValue() * 0.01f); // set window shape using AWTUtilities class AWTUtilities.setWindowShape(f, new Ellipse2D.Float(20f, -30f, 250.0f, 150.0f)); f.setLocation(500, 300); f.show(); } // if opacity value is changed public void stateChanged(ChangeEvent e) { l.setText("opacity value is =" + b.getValue()); // set opacity value for the window f.setOpacity(b.getValue() * 0.01f); }} |
Output :
3. Program to create a shaped translucent window (using setShape)and control its translucency using a slider
Java
// Program to create a shaped translucent// window (using setShape)// and control its translucency using a sliderimport javax.swing.event.*;import java.awt.*;import javax.swing.*;import java.awt.geom.*;import com.sun.awt.AWTUtilities;class solveit extends JFrame implements ChangeListener { // frame static JFrame f; // slider static JSlider b; // label static JLabel l; // main class public static void main(String[] args) { // create a new frame f = new JFrame("translucent window"); // create a object solveit s = new solveit(); // create label l = new JLabel(); // create a panel JPanel p = new JPanel(); // create a slider b = new JSlider(0, 100, 100); // paint the ticks and tracks b.setPaintTrack(true); b.setPaintTicks(true); b.setPaintLabels(true); // set spacing b.setMajorTickSpacing(20); b.setMinorTickSpacing(5); // setChangeListener b.addChangeListener(s); // add slider to panel p.add(b); p.add(l); f.add(p); // set the text of label l.setText("Opacity value is =" + b.getValue()); // set the size of frame f.setSize(300, 300); // decorated frame's opacity cant be set so make the frame undecorated f.setUndecorated(true); // set opacity value for the window f.setOpacity(b.getValue() * 0.01f); // set window shape f.setShape(new Ellipse2D.Float(20f, -30f, 250.0f, 150.0f)); f.setLocation(500, 300); f.show(); } // if opacity value is changed public void stateChanged(ChangeEvent e) { l.setText("opacity value is =" + b.getValue()); // set opacity value for the window f.setOpacity(b.getValue() * 0.01f); }} |
Output :
Note : The above programs might not run in an online compiler please use an offline IDE. It is recommended to use latest version of java to run the above programs, user might face problems if older versions of java are used.
