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Quatsch MIDlet
/*
Wireless Java 2nd edition
Jonathan Knudsen
Publisher: Apress
ISBN: 1590590775
*/
import java.io.IOException;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
import javax.microedition.midlet.MIDlet;
public class QuatschMIDlet extends MIDlet
implements CommandListener {
private Display mDisplay;
private QuatschCanvas mQuatschCanvas;
private Form mShowForm;
private Command mExitCommand, mShowCommand, mOkCommand;
public void startApp() {
if (mQuatschCanvas == null) {
try {
mQuatschCanvas = new QuatschCanvas("/quatsch.png",
"/atmosphere.png", "/background_tiles.png");
mQuatschCanvas.start();
mExitCommand = new Command("Exit", Command.EXIT, 0);
mShowCommand = new Command("Show/Hide", Command.SCREEN, 0);
mOkCommand = new Command("OK", Command.OK, 0);
mQuatschCanvas.addCommand(mExitCommand);
mQuatschCanvas.addCommand(mShowCommand);
mQuatschCanvas.setCommandListener(this);
}
catch (IOException ioe) {
System.out.println(ioe);
}
}
mDisplay = Display.getDisplay(this);
mDisplay.setCurrent(mQuatschCanvas);
}
public void pauseApp() {}
public void destroyApp(boolean unconditional) {
mQuatschCanvas.stop();
}
public void commandAction(Command c, Displayable s) {
if (c.getCommandType() == Command.EXIT) {
destroyApp(true);
notifyDestroyed();
}
else if (c == mShowCommand) {
if (mShowForm == null) {
mShowForm = new Form("Show/Hide");
ChoiceGroup cg = new ChoiceGroup("Layers", Choice.MULTIPLE);
cg.append("Fog", null);
cg.append("Dr. Quatsch", null);
cg.append("Background", null);
mShowForm.append(cg);
mShowForm.addCommand(mOkCommand);
mShowForm.setCommandListener(this);
}
ChoiceGroup cg = (ChoiceGroup)mShowForm.get(0);
cg.setSelectedIndex(0, mQuatschCanvas.isVisible(0));
cg.setSelectedIndex(1, mQuatschCanvas.isVisible(1));
cg.setSelectedIndex(2, mQuatschCanvas.isVisible(2));
mDisplay.setCurrent(mShowForm);
}
else if (c == mOkCommand) {
ChoiceGroup cg = (ChoiceGroup)mShowForm.get(0);
mQuatschCanvas.setVisible(0, cg.isSelected(0));
mQuatschCanvas.setVisible(1, cg.isSelected(1));
mQuatschCanvas.setVisible(2, cg.isSelected(2));
mDisplay.setCurrent(mQuatschCanvas);
}
}
}
class QuatschCanvas extends GameCanvas implements Runnable {
private boolean mTrucking;
private LayerManager mLayerManager;
private TiledLayer mAtmosphere;
private TiledLayer mBackground;
private int mAnimatedIndex;
private Sprite mQuatsch;
private int mState, mDirection;
private static final int kStanding = 1;
private static final int kRunning = 2;
private static final int kLeft = 1;
private static final int kRight = 2;
private static final int[] kRunningSequence = { 0, 1, 2 };
private static final int[] kStandingSequence = { 3 };
public QuatschCanvas(String quatschImageName,
String atmosphereImageName, String backgroundImageName)
throws IOException {
super(true);
// Create a LayerManager.
mLayerManager = new LayerManager();
int w = getWidth();
int h = getHeight();
mLayerManager.setViewWindow(96, 0, w, h);
createBackground(backgroundImageName);
createAtmosphere(atmosphereImageName);
createQuatsch(quatschImageName);
}
private void createBackground(String backgroundImageName)
throws IOException {
// Create the tiled layer.
Image backgroundImage = Image.createImage(backgroundImageName);
int[] map = {
1, 2, 0, 0, 0, 0, 0, 0,
3, 3, 2, 0, 0, 0, 5, 0,
3, 3, 3, 2, 4, 1, 3, 2,
6, 6, 6, 6, 6, 6, 6, 6
};
mBackground = new TiledLayer(8, 4, backgroundImage, 48, 48);
mBackground.setPosition(12, 0);
for (int i = 0; i < map.length; i++) {
int column = i % 8;
int row = (i - column) / 8;
mBackground.setCell(column, row, map[i]);
}
mAnimatedIndex = mBackground.createAnimatedTile(8);
mBackground.setCell(3, 0, mAnimatedIndex);
mBackground.setCell(5, 0, mAnimatedIndex);
mLayerManager.append(mBackground);
}
private void createAtmosphere(String atmosphereImageName)
throws IOException {
// Create the atmosphere layer
Image atmosphereImage = Image.createImage(atmosphereImageName);
mAtmosphere = new TiledLayer(8, 1, atmosphereImage,
atmosphereImage.getWidth(), atmosphereImage.getHeight());
mAtmosphere.fillCells(0, 0, 8, 1, 1);
mAtmosphere.setPosition(0, 96);
mLayerManager.insert(mAtmosphere, 0);
}
private void createQuatsch(String quatschImageName)
throws IOException {
// Create the sprite.
Image quatschImage = Image.createImage(quatschImageName);
mQuatsch = new Sprite(quatschImage, 48, 48);
mQuatsch.setPosition(96 + (getWidth() - 48) / 2, 96);
mQuatsch.defineReferencePixel(24, 24);
setDirection(kLeft);
setState(kStanding);
mLayerManager.insert(mQuatsch, 1);
}
public void start() {
mTrucking = true;
Thread t = new Thread(this);
t.start();
}
public void run() {
int w = getWidth();
int h = getHeight();
Graphics g = getGraphics();
int frameCount = 0;
int factor = 2;
int animatedDelta = 0;
while (mTrucking) {
if (isShown()) {
int keyStates = getKeyStates();
if ((keyStates & LEFT_PRESSED) != 0) {
setDirection(kLeft);
setState(kRunning);
mBackground.move(3, 0);
mAtmosphere.move(3, 0);
mQuatsch.nextFrame();
}
else if ((keyStates & RIGHT_PRESSED) != 0) {
setDirection(kRight);
setState(kRunning);
mBackground.move(-3, 0);
mAtmosphere.move(-3, 0);
mQuatsch.nextFrame();
}
else {
setState(kStanding);
}
frameCount++;
if (frameCount % factor == 0) {
int delta = 1;
if (frameCount / factor < 10) delta = -1;
mAtmosphere.move(delta, 0);
if (frameCount / factor == 20) frameCount = 0;
mBackground.setAnimatedTile(mAnimatedIndex,
8 + animatedDelta++);
if (animatedDelta == 3) animatedDelta = 0;
}
g.setColor(0x5b1793);
g.fillRect(0, 0, w, h);
mLayerManager.paint(g, 0, 0);
flushGraphics();
}
try { Thread.sleep(80); }
catch (InterruptedException ie) {}
}
}
public void stop() {
mTrucking = false;
}
public void setVisible(int layerIndex, boolean show) {
Layer layer = mLayerManager.getLayerAt(layerIndex);
layer.setVisible(show);
}
public boolean isVisible(int layerIndex) {
Layer layer = mLayerManager.getLayerAt(layerIndex);
return layer.isVisible();
}
private void setDirection(int newDirection) {
if (newDirection == mDirection) return;
if (mDirection == kLeft)
mQuatsch.setTransform(Sprite.TRANS_MIRROR);
else if (mDirection == kRight)
mQuatsch.setTransform(Sprite.TRANS_NONE);
mDirection = newDirection;
}
private void setState(int newState) {
if (newState == mState) return;
switch (newState) {
case kStanding:
mQuatsch.setFrameSequence(kStandingSequence);
mQuatsch.setFrame(0);
break;
case kRunning:
mQuatsch.setFrameSequence(kRunningSequence);
break;
default:
break;
}
mState = newState;
}
}
