Mega Code Archive
Use Image as buffer
<![CDATA[
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);
}
}
]]>