[英]How to save a Java image created with Graphics using ImageIO
我正在使用圖形庫創建圖像,並嘗試使用BufferedImage和ImageIO保存創建的圖像。 運行后,我的圖像彈出,但是保存的圖像只是黑色的。
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
public class drawing extends Canvas {
public static void main(String[] args) {
JFrame frame = new JFrame("My Drawing");
Canvas canvas = new drawing();
canvas.setSize(400, 400);
canvas.setBackground(Color.CYAN);
frame.add(canvas);
frame.pack();
frame.setVisible(true);
}
public void paint(Graphics g) {
Rectangle bb = new Rectangle(100, 100, 200, 200);
g.setColor(Color.yellow);
try {
mickey(g, bb);
} catch (IOException e) {
e.printStackTrace();
}
}
public void boxOval(Graphics g, Rectangle bb) {
g.fillOval(bb.x, bb.y, bb.width, bb.height);
g.setColor(Color.blue);
}
public void mickey(Graphics g, Rectangle bb) throws IOException {
boxOval(g, bb);
int dx = bb.width / 2;
int dy = bb.height / 2;
g.setColor(Color.RED);
Rectangle half = new Rectangle(bb.x, bb.y, dx, dy);
half.translate(-dx / 2, -dy / 2);
boxOval(g, half);
half.translate(dx * 2, 0);
boxOval(g, half);
half.translate(dx / 10, 50);
boxOval(g, half);
BufferedImage buff = new BufferedImage(dx, dy, BufferedImage.TYPE_INT_RGB);
File file = new File("mickey.png");
System.out.println("saving....");
ImageIO.write(buff, "png", file);
System.out.println("saved!");
}
}
我希望保存到mickey.png
的圖像將與我之前在mickey
方法中繪制的圖像相同。
您需要這樣做:
BufferedImage buff = new BufferedImage(dx, dy, BufferedImage.TYPE_INT_RGB);
this.paint(buff.getGraphics()); // call paint to draw on the image
File file = new File("mickey.png");
System.out.println("saving....");
ImageIO.write(buff, "png", file);
System.out.println("saved!");
重新排列代碼以在mickey()和paint()外進行保存。
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