Java AWT | Canvas Class - GeeksforGeeks

02 Jul, 2021
Canvas class is a part of Java AWT. Canvas is a blank rectangular area where the user can draw or trap input from the user. Canvas class inherits the Component class.Constructor of the Canvas class are :  
Canvas(): Creates a new blank canvas.Canvas(GraphicsConfiguration c): Creates a new canvas with a specified graphics configuration.
Canvas(): Creates a new blank canvas.
Canvas(GraphicsConfiguration c): Creates a new canvas with a specified graphics configuration.
 
Commonly used Methods in Canvas Class
 
Below programs illustrate the use of Canvas Class :  
Program 1: To create a canvas and paint the canvas.  
Java
// Java Program to create a to create// a canvas and paint the canvasimport java.awt.*;import javax.swing.*;class canvas extends JFrame {     // constructor    canvas()    {        super("canvas");         // create a empty canvas        Canvas c = new Canvas() {             // paint the canvas            public void paint(Graphics g)            {                // set color to red                g.setColor(Color.red);                 // set Font                g.setFont(new Font("Bold", 1, 20));                 // draw a string                g.drawString("This is a canvas", 100, 100);            }        };         // set background        c.setBackground(Color.black);         add(c);        setSize(400, 300);        show();    }     // Main Method    public static void main(String args[])    {        canvas c = new canvas();    }}
Output: 
 
Program 2: To create a canvas and add mouse listener to the canvas(a circle of radius 5 will appear at the points where mouse are clicked or dragged on the canvas).  
Java
// Java Program to create a// canvas and mouse listener to the// canvas ( a circle of radius 5 will appear// at the points where mouse are clicked or//  dragged on the canvas)import java.awt.*;import javax.swing.*;import java.awt.event.*; class canvas extends JFrame implements MouseListener, MouseMotionListener {     // create a canvas    Canvas c;     // constructor    canvas()    {        super("canvas");         // create a empty canvas        c = new Canvas() {            public void paint(Graphics g)            {            }        };         // set background        c.setBackground(Color.black);         // add mouse listener        c.addMouseListener(this);        c.addMouseMotionListener(this);         add(c);        setSize(400, 300);        show();    }     // mouse listener  and mouse motion listener methods    public void mouseClicked(MouseEvent e)    {        Graphics g = c.getGraphics();         g.setColor(Color.red);         // get X and y position        int x, y;        x = e.getX();        y = e.getY();         // draw a Oval at the point        // where mouse is moved        g.fillOval(x, y, 5, 5);    }     public void mouseMoved(MouseEvent e)    {    }     public void mouseDragged(MouseEvent e)    {        Graphics g = c.getGraphics();         g.setColor(Color.red);         // get X and y position        int x, y;        x = e.getX();        y = e.getY();         // draw a Oval at the point where mouse is moved        g.fillOval(x, y, 5, 5);    }     public void mouseExited(MouseEvent e)    {    }     public void mouseEntered(MouseEvent e)    {    }     public void mouseReleased(MouseEvent e)    {    }     public void mousePressed(MouseEvent e)    {    }    // main class    public static void main(String args[])    {        canvas c = new canvas();    }}
Output: 
 
Reference: https://docs.oracle.com/javase/7/docs/api/java/awt/Canvas.html 
ManasChhabra2
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Java-AWT
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