My instructor sent me this code, which is supposed to be an integral part of an ongoing project. Thing is, it doesn't work.
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.Kernel;
import java.awt.image.ConvolveOp;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import javax.swing.*;
public class ImageUtil {
public static void resize(File originalFile, File resizedFile, int newWidth, float quality) throws IOException{
if(quality <0||quality>1){
throw new IllegalArgumentException ("quality has to be between 0 and 1");
}
ImageIcon ii = new ImageIcon(originalFile.getCanonicalPath());
Image i = ii.getImage();
Image resizedImage = null;
int iWidth = i.getWidth (null);
int iHeight = i.getHeight(null);
if (iWidth > iHeight){
resizedImage = i.getScaledInstance(newWidth,(newWidth*iHeight)/iWidth, Image.SCALE_SMOOTH);
} else {
resizedImage = i.getScaledInstance((newWidth*iWidth)/iHeight,newWidth, Image.SCALE_SMOOTH);
}
Image temp = new ImageIcon (resizedImage).getImage();
BufferedImage bufferedImage = new BufferedImage (temp.getWidth(null), temp.getHeight(null),
BufferedImage.TYPE_INT_RGB);
// copy to a buffered image
Graphics g = bufferedImage.createGraphics();
g.setColor(Color.white);
g.fillRect(0,0,temp.getWidth(null), temp.getHeight(null)); // causea el error de ejecución?
g.drawImage(temp,0,0,null);
g.dispose();
float softenFactor = 0.05f;
float [] softenArray = {0, softenFactor,0, softenFactor, 1-(softenFactor*4), softenFactor,0, softenFactor,0};
Kernel kernel = new Kernel (3,3,softenArray);
ConvolveOp cOp = new ConvolveOp (kernel, ConvolveOp.EDGE_NO_OP,null);
bufferedImage = cOp.filter (bufferedImage,null);
FileOutputStream out = new FileOutputStream(resizedFile);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bufferedImage);
param.setQuality(quality,true);
encoder.setJPEGEncodeParam(param);
encoder.encode(bufferedImage);
}
public static void main(String args[]) throws IOException {
File originalImage= new File ("/images/goya.jpg");
resize(originalImage,new File("/images/goyanuevotamanio.jpg"),350, 0.2f);
resize(originalImage, new File("/images/goyanuevotamanio.jpg"), 350, 1f);
}
}
He says the code should be able to resize both height and width yet his resize method:
public static void resize(File originalFile, File resizedFile, int newWidth, float quality)
lacks a newHeight
parameter.
The RuntimeException that's thrown says:
Exception in thread "main" java.lang.IllegalArgumentException: **Width (-1) and height (-1) cannot be <= 0**
at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:999)
at java.awt.image.BufferedImage.<init>(BufferedImage.java:312)
at ImageUtil.resize(ImageUtil.java:38)
at ImageUtil.main(ImageUtil.java:72)
Java Result: 1
How can I change this?