Admin: 1 версия

2010-06-01T06:53:46Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:45Z

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== Determining If an Image Has Transparent Pixels ==

<source lang="java">
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.PixelGrabber;
import javax.swing.ImageIcon;
public class Main {
public static void main(String[] argv) throws Exception {
Image image = new ImageIcon("a.png").getImage();
if (image instanceof BufferedImage) {
BufferedImage bimage = (BufferedImage) image;
System.out.println(bimage.getColorModel().hasAlpha());
}
PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
try {
pg.grabPixels();
} catch (InterruptedException e) {
}
ColorModel cm = pg.getColorModel();
System.out.println(cm.hasAlpha());
}
}

</source>

== Draw ten rectangles with different levels of transparency ==

<source lang="java">
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TransparentRectangles extends JPanel {
public void paint(Graphics g) {
super.paint(g);
Graphics2D g2d = (Graphics2D) g;
for (int i = 1; i <= 10; i++) {
g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, i * 0.1f));
g2d.fillRect(50 * i, 20, 50, 50);
}
}
public static void main(String[] args) {
JFrame frame = new JFrame("Transparent Rectangles");
frame.add(new TransparentRectangles());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(600, 100);
frame.setVisible(true);
}
}

</source>

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Java/2D Graphics GUI/Transparent - История изменений

Admin: 1 версия

в 18:01, 31 мая 2010