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Simple Line Canvas Example

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This is a simple example of drawing lines using canvas class in J2ME.

Simple Line Canvas Example

     

This is a simple example of drawing lines using canvas class in J2ME. In this example we are creating three different lines at different locations and form. In the source code CanvasLine class extends the Canvas class to draw these lines. To draw these lines by two types, one is Graphics.DOTTED and another is Graphics.SOLID. To draw this canvas we are uses the following methods:

  • drawLine(int x1, int y1, int x2, int y2)   
  • fillRect(int x, int y, int width, int height)
  • setColor(int red, int green, int blue)
  • setStrokeStyle(int style)

 

 

 

The Application is as follows:

 

Source Code of LineCanvas.java

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class LineCanvas extends MIDlet{
  private Display display;

  public void startApp(){
  Canvas canvas = new CanvasLine();
  display = Display.getDisplay(this);
  display.setCurrent(canvas);
  }

  public void pauseApp(){}

  public void destroyApp(boolean unconditional){}
}

class CanvasLine extends Canvas {
  public void paint(Graphics g) {
  int width = getWidth();
  int height = getHeight();

  g.setColor(255162117);
  g.fillRect(00, width, height);

  g.setColor(00255);
  g.drawLine(0, height/2, width - 1, height/2);
  
  g.setStrokeStyle(Graphics.DOTTED);
  g.setColor(0xFFFF00);
  g.drawLine(0, height/4, width - 1, height/4);

  g.setColor(00255);
  g.setStrokeStyle(Graphics.SOLID);
  g.drawLine(00, width - 1, height - 1);
  }  
}

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Posted on: December 19, 2008

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