Mega Code Archive
Navigatable Canvas
<![CDATA[
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.midlet.MIDlet;
public class NavigateMIDlet extends MIDlet implements CommandListener {
int stepX;
int stepY;
private Command leftCommand;
private Command rightCommand;
private Display display;
Displayable nd;
Image image = null;
public NavigateMIDlet() {
try {
image = Image.createImage("/M.png");
} catch (Exception e) {
}
Display display = Display.getDisplay(this);
nd = new NavigateCanvas(image);
stepX = ((NavigateCanvas) nd).getWidth() / 4;
stepY = ((NavigateCanvas) nd).getHeight() / 4;
leftCommand = new Command("<Left", Command.SCREEN, 1);
rightCommand = new Command("Right>", Command.SCREEN, 1);
nd.addCommand(rightCommand);
nd.addCommand(leftCommand);
nd.setCommandListener(this);
display.setCurrent(nd);
}
public void startApp() {
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable d) {
if (d == nd && c == leftCommand) {
((NavigateCanvas) nd).steppingXY(stepX, 0);
((NavigateCanvas) nd).repaint();
} else if (d == nd && c == rightCommand) {
((NavigateCanvas) nd).steppingXY(-stepX, 0);
((NavigateCanvas) nd).repaint();
}
}
}
class NavigateCanvas extends Canvas {
private Image image;
private int newX = 0;
private int newY = 0;
public NavigateCanvas(Image image) {
this.image = image;
newX = 0;
newY = 0;
}
public void steppingXY(int x, int y) {
newX += x;
newY += y;
}
public void paint(Graphics g) {
int width = this.getWidth();
int height = this.getHeight();
g.setGrayScale(255);
g.fillRect(0, 0, width - 1, height - 1);
g.setGrayScale(0);
g.drawRect(0, 0, width - 1, height - 1);
g.translate(newX, newY);
g.drawImage(image, 0, 0, g.TOP | g.LEFT);
}
}
]]>