Draw a picture, how to generate an image file, such as bmp format

swordskys

import java.awt.Frame;
import java.awt.Graphics;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestDraw extends Frame {
public TestDraw (String title) {
super (title);
addWindowListener (new WindowAdapter () {
public void windowClosing (WindowEvent evt) {
System.exit (0);
}
});
setSize (1024,768);
setVisible (true);
}
public void paint (Graphics g) {
int width2 = 120;
g.fillArc (512, 384, 2 * width2, 2 * width2, 0, 360);
}
}
The source code is as above, how to write next? Make a picture can generate a picture file? Thank you

jinm1976

Here is a screenshot of the code, you can refer to it to output the picture, but here is generated jpg

public static void drawImg () {
try {
int w = 0, h = 0, o_w = 0, o_h = 0, l = 0, t = 0;
// w- width of target image, h- height of target image, o_w- width of image to be cropped, o_h- height of image to be cropped, l- distance of cropped portion to the left of image to be cropped, t- distance of cropped portion to be cropped Image top margin
BufferedImage image = new BufferedImage (w, h,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics ();
Image img = Toolkit.getDefaultToolkit (). GetImage ("c:\\test.jpg"); // Get the source picture
System.out.println ("img-width =" + img.getWidth (null));
System.out.println ("img-height =" + img.getHeight (null));
g.setColor (Color.white); // The background color of the picture is white
g.fillRect (0, 0, w, h); // Draw a white rectangle first
g.drawImage (img, 0, 0, o_w, o_h, null); // First set the picture to the current size
g.dispose ();
g.drawImage (img, 0, 0, w, h, l, t, (l + w), (h + t), Color.WHITE,
null); // Crop
g.dispose ();
FileOutputStream outfile = new FileOutputStream ("d:\\test1.jpg"); // Output picture
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder (outfile);
encoder.encode (image); // Output picture
outfile.close ();
} catch (Exception e) {
e.printStackTrace ();
}
}

variolas

Java does not seem to support bmp format, jpg can. There are many online. Thejinm1976method is feasible. Or you can find the realization method of random verification code produced by java on the Internet.

seakey

The method of ls is indeed very good

sindbad

Use javax.imageio.ImageIO class. Very simple. It has a static method to directly save the image, which can be bmp, jpg, png, etc., but it seems that gif does not work.

swordskys

I was drawing in public void paint (Graphics g) {}, where should those codes be added?

jjyhktc10

bmp is a bitmap
You want to code ...
Record the information of each point ...

swordskys

public void paint (Graphics g) {
int width2 = 120;
g.fillArc (512, 384, 2 * width2, 2 * width2, 0, 360);
}
I am drawing in public void paint (Graphics g) {}, where should those codes be added?
I tried it by the method ofjinm1976, but no picture was generated.

swordskys

Still not allowed