Admin: 1 версия

2010-06-01T05:00:15Z

1 версия

в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

Новая страница

== Off screen canvas ==



<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.lcdui.Image;
import javax.microedition.midlet.MIDlet;
class OffscreenCanvas extends Canvas {
private Image mImage;
public void paint(Graphics g) {
if (mImage == null)
initialize();
g.drawImage(mImage, 0, 0, Graphics.TOP | Graphics.LEFT);
}
private void initialize() {
int w = getWidth();
int h = getHeight();
mImage = Image.createImage(w, h);
Graphics g = mImage.getGraphics();
g.drawRect(0, 0, w - 1, h - 1);
g.drawLine(w - 1, 0, 0, h - 1);
}
}
public class OffscreenMIDlet extends MIDlet {
public void startApp() {
Displayable d = new OffscreenCanvas();
d.addCommand(new Command("Exit", Command.EXIT, 0));
d.setCommandListener(new CommandListener() {
public void commandAction(Command c, Displayable s) {
notifyDestroyed();
}
});
Display.getDisplay(this).setCurrent(d);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
}</source>



== Use Image as buffer ==



<source lang="java">
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.midlet.MIDlet;
public class ImageBufferGraphicsMIDlet 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();
Image image = Image.createImage(width, height);
Graphics imageGraphics = image.getGraphics();
imageGraphics.fillRect(0, 0, width, height);
int count = 10;
int yIncrement = height/count;
int xIncrement = width/count;
for (int i = 0, x = xIncrement, y = 0; i < count; i++) {
imageGraphics.setColor(0xC0 + ((128 + 10 * i) << 8) + ((128 + 10 * i) << 16));
imageGraphics.drawLine(0, y, x, height);
y += yIncrement;
x += xIncrement;
}
imageGraphics.setFont(Font.getFont(Font.FACE_PROPORTIONAL,
Font.STYLE_UNDERLINED, Font.SIZE_SMALL));
imageGraphics.setColor(0xffff00);
imageGraphics.drawString("Image Graphics", width/2, 0, Graphics.TOP | Graphics.HCENTER);
g.drawImage(image, 0, 0, Graphics.TOP | Graphics.LEFT);
}
}</source>

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Java Tutorial/J2ME/Screen Buffer - История изменений

Admin: 1 версия

в 17:44, 31 мая 2010