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Home / Questions / Q 4847
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What is canvas?

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What is canvas?

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    1. Learner

      The Canvas control represents a blank rectangular area where the user can draw or trap input events from the user.
      Canvas class inherits the Component class.

      Constructor of the Canvas class:

      Canvas()
      Canvas(GraphicsConfiguration c)

      Methods:

      addNotify()
      createBufferStrategy(int n)
      createBufferStrategy(int n, BufferCapabilities c)
      getBufferStrategy()
      paint(Graphics g)
      update(Graphics g)

      Basic Example:


      import java.awt.*;
      public class MyCanvasExample
      {
      public MyCanvasExample()
      {
      Frame f= new Frame("My Canvas Example:");
      f.add(new MyCanvas());
      f.setLayout(null);
      f.setSize(300, 300);
      f.setVisible(true);
      }
      public static void main(String args[])
      {
      new MyCanvasExample();
      }
      }
      class MyCanvas extends Canvas
      {
      public MyCanvas() {
      setBackground (Color.BLACK);
      setSize(250, 200);
      }
      public void paint(Graphics g)
      {
      g.setColor(Color.RED);
      g.fillOval(60, 60, 120, 60);
      }
      }

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