Java Tutorial/J2ME/Graphics

Change stroke style between drawing

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 RectMIDlet extends MIDlet implements CommandListener {
  private Command exitCommand;
  Display display;
  public void startApp() {
    Display display = Display.getDisplay(this);
    Displayable d = new RectCanvas();
    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 RectCanvas extends Canvas {
  int width = 0;
  int height = 0;
  public void paint(Graphics g) {
    width = getWidth();
    height = getHeight();
    g.setGrayScale(255);
    g.fillRect(0, 0, width - 1, height - 1);
    g.setGrayScale(0);
    g.drawRect(0, 0, width - 1, height - 1);
    g.drawRect(5, 5, 40, 40);
    g.fillRoundRect(25, 25, 40, 40, 15, 15);
  }
}

Get stroke style

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 SizeMIDlet extends MIDlet implements CommandListener {
  private Command exitCommand;
  Display display;
  public void startApp() {
    Display display = Display.getDisplay(this);
    Displayable d = new SizeCanvas();
    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 SizeCanvas extends Canvas {
  int width = 0;
  int height = 0;
  public void paint(Graphics g) {
    width = getWidth();
    height = getHeight();
    g.setGrayScale(255);
    g.fillRect(0, 0, width - 1, height - 1);
    g.setGrayScale(0);
    g.drawString("Stroke Style:" + g.getStrokeStyle(), 0, 60, Graphics.TOP | Graphics.LEFT);
    g.drawRect(0, 0, width - 1, height - 1);
    g.setStrokeStyle(Graphics.DOTTED);
    g.drawLine(00, 40, 60, 60);
  }
}

Set color

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.midlet.MIDlet;
public class SetColorGraphicsMIDlet 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.setColor(0xFFFF00);
    g.drawLine(0, height / 4, width - 1, height / 4);
  }
}

Set color and gray scale

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.midlet.MIDlet;
public class DrawRectGraphicsMIDlet 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.setColor(0);
    g.setGrayScale(100);
        g.drawRect(width/4, 0, width/2, height/4);
  }
}

Set Gray style

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.midlet.MIDlet;
public class SetGrayScaleGraphicsMIDlet 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.setColor(0);
    g.setGrayScale(100);
    g.drawLine(0,  2, width - 1, height / 2);
  }
}

Set stroke style

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.midlet.MIDlet;
public class SetStrokeStyleGraphicsMIDlet 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.setColor(0);
    g.setStrokeStyle(Graphics.DOTTED);
    g.drawLine(0, height / 2, width - 1, height / 2);
  }
}

Translate coordinate

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 OrigTransMIDlet extends MIDlet implements CommandListener {
  private Command exitCommand;
  Display display;
  public void startApp() {
    Display display = Display.getDisplay(this);
    Displayable d = new OrigTransCanvas();
    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 OrigTransCanvas extends Canvas {
  int width = 0;
  int height = 0;
  public void paint(Graphics g) {
    width = getWidth();
    height = getHeight();
    g.setGrayScale(255);
    g.fillRect(0, 0, width - 1, height - 1);
    g.setGrayScale(0);
    g.drawRect(0, 0, width - 1, height - 1);
    int counts = 5;
    int step = width / 5;
    for (int i = 1; i <= 5; i++) {
      g.fillRect(0, 0, step, step);
      g.translate(step, step);
    }
  }
}