goja.core.libs.Images Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2013-2014 sagyf Yang. The Four Group.
*/
package goja.core.libs;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.stream.FileImageOutputStream;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
/**
*
* Images Utils.
*
*
* @author sagyf yang
* @version 1.0 2014-04-04 10:16
* @since JDK 1.6
*/
public class Images {
/**
* Resize an image
*
* @param originalImage The image file
* @param to The destination file
* @param w The new width (or -1 to proportionally resize)
* @param h The new height (or -1 to proportionally resize)
*/
public static void resize(File originalImage, File to, int w, int h) {
resize(originalImage, to, w, h, false);
}
/**
* Resize an image
*
* @param originalImage The image file
* @param to The destination file
* @param w The new width (or -1 to proportionally resize) or the maxWidth if keepRatio is true
* @param h The new height (or -1 to proportionally resize) or the maxHeight if keepRatio is true
* @param keepRatio : if true, resize will keep the original image ratio and use w and h as max dimensions
*/
public static void resize(File originalImage, File to, int w, int h, boolean keepRatio) {
try {
BufferedImage source = ImageIO.read(originalImage);
int owidth = source.getWidth();
int oheight = source.getHeight();
double ratio = (double) owidth / oheight;
int maxWidth = w;
int maxHeight = h;
if (w < 0 && h < 0) {
w = owidth;
h = oheight;
}
if (w < 0 && h > 0) {
w = (int) (h * ratio);
}
if (w > 0 && h < 0) {
h = (int) (w / ratio);
}
if (keepRatio) {
h = (int) (w / ratio);
if (h > maxHeight) {
h = maxHeight;
w = (int) (h * ratio);
}
if (w > maxWidth) {
w = maxWidth;
h = (int) (w / ratio);
}
}
String mimeType = "image/jpeg";
if (to.getName().endsWith(".png")) {
mimeType = "image/png";
}
if (to.getName().endsWith(".gif")) {
mimeType = "image/gif";
}
// out
BufferedImage dest = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Image srcSized = source.getScaledInstance(w, h, Image.SCALE_SMOOTH);
Graphics graphics = dest.getGraphics();
graphics.setColor(Color.WHITE);
graphics.fillRect(0, 0, w, h);
graphics.drawImage(srcSized, 0, 0, null);
ImageWriter writer = ImageIO.getImageWritersByMIMEType(mimeType).next();
ImageWriteParam params = writer.getDefaultWriteParam();
FileImageOutputStream toFs = new FileImageOutputStream(to);
writer.setOutput(toFs);
IIOImage image = new IIOImage(dest, null, null);
writer.write(null, image, params);
toFs.flush();
toFs.close();
writer.dispose();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Crop an image
*
* @param originalImage The image file
* @param to The destination file
* @param x1 The new x origin
* @param y1 The new y origin
* @param x2 The new x end
* @param y2 The new y end
*/
public static void crop(File originalImage, File to, int x1, int y1, int x2, int y2) {
try {
BufferedImage source = ImageIO.read(originalImage);
String mimeType = "image/jpeg";
if (to.getName().endsWith(".png")) {
mimeType = "image/png";
}
if (to.getName().endsWith(".gif")) {
mimeType = "image/gif";
}
int width = x2 - x1;
int height = y2 - y1;
// out
BufferedImage dest = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Image croppedImage = source.getSubimage(x1, y1, width, height);
Graphics graphics = dest.getGraphics();
graphics.setColor(Color.WHITE);
graphics.fillRect(0, 0, width, height);
graphics.drawImage(croppedImage, 0, 0, null);
ImageWriter writer = ImageIO.getImageWritersByMIMEType(mimeType).next();
ImageWriteParam params = writer.getDefaultWriteParam();
writer.setOutput(new FileImageOutputStream(to));
IIOImage image = new IIOImage(dest, null, null);
writer.write(null, image, params);
writer.dispose();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Encode an image to base64 using a data: URI
*
* @param image The image file
* @return The base64 encoded value
* @throws java.io.IOException
*/
public static String toBase64(File image) throws IOException {
return "data:" + MimeTypes.getMimeType(image.getName()) + ";base64," + Codec.encodeBASE64(IO.readContent(image));
}
/**
* 将指定的图片加入到当前图片中的指定位置. 即向图片中打水印.
*
* @param file 要添加的图片文件。
* @param position 要添加的图片在当前图片中的位置.
* 其取值范围为1-9之间的整数(默认为9)。分别代表：左上、上中、右上、左中、正中、右中、左下、中下、右下
*/
public void add(File dest, File file, int position) {
if (dest.exists() && !dest.isDirectory()) {
String fn = file.getName().toLowerCase();
int opacityType = fn.endsWith(".png") || fn.endsWith("gif") ?
BufferedImage.TYPE_INT_ARGB : BufferedImage.TYPE_INT_RGB;
Image destImg;
try {
destImg = ImageIO.read(dest);
} catch (IllegalArgumentException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new RuntimeException(e);
}
int width = destImg.getWidth(null);
int height = destImg.getHeight(null);
final BufferedImage image = new BufferedImage(width, height, opacityType);
Image src;
try {
src = ImageIO.read(file);
} catch (IllegalArgumentException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new RuntimeException(e);
}
int ww = src.getWidth(null);
int hh = src.getHeight(null);
int WW, HH;
switch (position) {
case 1:
WW = 0;
HH = 0;
break;
case 2:
WW = (width - ww) / 2;
HH = 0;
break;
case 3:
WW = width - ww;
HH = 0;
break;
case 4:
WW = 0;
HH = (height - hh) / 2;
break;
case 5:
WW = (width - ww) / 2;
HH = (height - hh) / 2;
break;
case 6:
WW = width - ww;
HH = (height - hh) / 2;
break;
case 7:
WW = 0;
HH = height - hh;
break;
case 8:
WW = (width - ww) / 2;
HH = height - hh;
break;
default:
WW = width - ww;
HH = height - hh;
}
Graphics g = image.createGraphics();
g.drawImage(src, WW, HH, ww, hh, null);
g.dispose();
}
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy