Java Tutorial/J2ME/Line

Draw lines

   <source lang="java">

import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Graphics; import javax.microedition.midlet.MIDlet; public class GraphicsMIDlet extends MIDlet {

 private Display display;
 protected void startApp() {
   Canvas canvas = new LineCanvas();
   display = Display.getDisplay(this);
   display.setCurrent(canvas);
 }
 protected void pauseApp() {
 }
 protected void destroyApp(boolean unconditional) {
 }

} class LineCanvas extends Canvas {

 public void paint(Graphics g) {
   int width = getWidth();
   int height = getHeight();
   g.drawLine(0, 0, width - 1, height - 1);
 }

}</source>

Plot 2D

   <source lang="java">

import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Graphics; import javax.microedition.midlet.MIDlet; public class Plot2DMIDlet extends MIDlet implements CommandListener {

 private Command exitCommand;
 Display display;
 int[] line1 = { 80, 20, 60, 70, 50, 20 };
 int[] line2 = { 20, 10, 50, 60, 90, 60 };
 public void startApp() {
   int maxX = 10;
   int maxY = 100;
   Display display = Display.getDisplay(this);
   Displayable d = new Plot2DCanvas(line1, line2, maxX, maxY);
   exitCommand = new Command("Exit", Command.EXIT, 1);
   d.addCommand(exitCommand);
   d.setCommandListener(this);
   display.setCurrent(d);
 }
 public void pauseApp() {
 }
 public void destroyApp(boolean unconditional) {
 }
 public void commandAction(Command c, Displayable s) {
   notifyDestroyed();
 }

} class Plot2DCanvas extends Canvas {

 int line1[];
 int line2[];
 int maxX, maxY;
 Plot2DCanvas(int[] line1, int[] line2, int maxX, int maxY) {
   this.line1 = line1;
   this.line2 = line2;
   this.maxX = maxX;
   this.maxY = maxY;
 }
 public void paint(Graphics g) {
   int width = this.getWidth();
   int height = this.getHeight();
   g.setGrayScale(0);
   g.drawLine(0, height, 0, 0);
   g.drawLine(0, height - 1, width, height - 1);
   int deltaX = width / maxX;
   int deltaY = height / maxY;
   g.setStrokeStyle(Graphics.DOTTED);
   for (int i = 0; i < line1.length - 1; i++) {
     g.drawLine(deltaX * i, height - deltaY * line1[i], deltaX * (i + 1), height - deltaY
         * line1[i + 1]);
   }
 }

}</source>