import java.awt.Graphics2D;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.imageio.ImageIO;
public class PngFileWriter {
public void append(List inputFileNameList, String outputFileName, boolean isX) {
if (inputFileNameList == null || inputFileNameList.size() == 0) {
return;
}
try {
boolean isFirstPng = true;
BufferedImage outputImg = null;
int outputImgW = 0;
int outputImgH = 0;
for (String pngFileName : inputFileNameList) {
if (isFirstPng) {
isFirstPng = false;
outputImg = ImageIO.read(new File(pngFileName));
outputImgW = outputImg.getWidth();
outputImgH = outputImg.getHeight();
} else {
BufferedImage appendImg = ImageIO.read(new File(pngFileName));
int appendImgW = appendImg.getWidth();
int appendImgH = appendImg.getHeight();
if (isX) {
outputImgW = outputImgW + appendImgW;
outputImgH = outputImgH > appendImgH ? outputImgH : appendImgH;
} else {
outputImgW = outputImgW > appendImgW ? outputImgW : appendImgW;
outputImgH = outputImgH + appendImgH;
}
// create basic image
Graphics2D g2d = outputImg.createGraphics();
BufferedImage imageNew = g2d.getDeviceConfiguration().createCompatibleImage(outputImgW, outputImgH,
Transparency.TRANSLUCENT);
g2d.dispose();
g2d = imageNew.createGraphics();
int oldImgW = outputImg.getWidth();
int oldImgH = outputImg.getHeight();
g2d.drawImage(outputImg, 0, 0, oldImgW, oldImgH, null);
if (isX) {
g2d.drawImage(appendImg, oldImgW, 0, appendImgW, appendImgH, null);
} else {
g2d.drawImage(appendImg, 0, oldImgH, appendImgW, appendImgH, null);
}
g2d.dispose();
outputImg = imageNew;
}
}
writeImageLocal(outputFileName, outputImg);
} catch (Exception e) {
e.printStackTrace();
}
}
private void writeImageLocal(String fileName, BufferedImage image) {
if (fileName != null && image != null) {
try {
File file = new File(fileName);
ImageIO.write(image, "png", file);
} catch (IOException e) {
e.printStackTrace();
}
}
}
}