/**
* 圖片切割
*
* @param srcImageFile 圖片來源
* @param descDir 切割後儲存位置
* @param destWidth 切割寬度
* @param destHeight 切割高度
*/
public static void cut(String srcImageFile, String descDir, int destWidth, int destHeight) {
try {
Image img;
ImageFilter cropFilter;
//讀取圖片來源
BufferedImage bi = ImageIO.read(new File(srcImageFile));
int srcWidth = bi.getHeight();//圖片原始寬度
int srcHeight = bi.getWidth();//圖片原始高度
if (srcWidth > destWidth && srcHeight > destHeight) {
Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
destWidth = 200;//切割寬度
destHeight = 150;//切割高度
int cols = 0;//切割橫向數量
int rows = 0;//切割縱向數量
//計算切割的橫向和縱向數量
if (srcWidth % destWidth == 0) {
cols = srcWidth / destWidth;
} else {
cols = (int) Math.floor(srcWidth / destWidth) + 1;
}
if (srcHeight % destHeight == 0) {
rows = srcHeight / destHeight;
} else {
rows = (int) Math.floor(srcHeight / destHeight) + 1;
}
//循環建立切割
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
//四個參數分別為圖片的起點坐標和寬高
//即：CropImageFilter(int x, int y, int width, int height)
cropFilter = new CropImageFilter(j * 200, i * 150, destWidth, destHeight);
img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(), cropFilter));
BufferedImage tag = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(img, 0, 0, null);//繪制縮小後圖片
g.dispose();
//輸出圖片
ImageIO.write(tag, "JPEG", new File(descDir + "pre_map_" + i + "_" + j + ".jpg"));
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}