Some ID photo apps will automatically format multiple pictures for you after you upload a picture. The following code can realize this automatic typesetting function with intervals.
operation result:
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class Demo {
public static void main(String[] args) throws IOException {
int pageWidth = 105; //A6尺寸
int pageHeight = 148; //A6尺寸
int photoWidth = 25; //A1尺寸
int photoHeight = 35; //A1尺寸
int interval = 2; //间隙大小
File inFIle = new File("d:/AAfile/yh.jpg");
File outFIle = new File("d:/AAfile/yhheads.jpg");
draw(pageWidth,pageHeight,photoWidth,photoHeight,interval,inFIle,outFIle);
}
public static void draw(int pageWidth, int pageHeight, int photoWidth, int photoHeight,
int interval, File inFile, File outFile) throws IOException {
//这里pageWidth为什么是减去interval
int xNum = (pageWidth - interval) / (photoWidth + interval); //横向放置个数
int yNum = (pageHeight - interval) / (photoHeight + interval);//纵向放置个数
int left = (pageWidth + interval - (photoWidth + interval) * xNum) / 2;//横向起始点
int top = (pageHeight + interval - (photoHeight + interval) * yNum) / 2;//纵向起始点
int xpixel = getPixel(pageWidth);
int ypixel = getPixel(pageHeight);
BufferedImage photo = ImageIO.read(inFile);
BufferedImage bi = new BufferedImage(xpixel,ypixel,BufferedImage.TYPE_INT_RGB);
Graphics2D g = bi.createGraphics();
//填充背景
g.setColor(Color.white);
g.fillRect(0,0,xpixel,ypixel);
//绘制图片
int xg,yg;
for (int i = 0; i < yNum; i++){
yg = getPixel(top + i * (photoHeight + interval));
for (int j = 0; j < xNum; j++){
xg = getPixel(left + j * (photoWidth + interval));
g.drawImage(photo,xg,yg,getPixel(photoWidth),getPixel(photoHeight),null);
}
}
//绘制辅助线 可设置无需辅助线
g.setColor(Color.black);
int x,y;
//纵向
for (int i = 0; i < xNum; i++){
xg = getPixel(left + i * (photoWidth + interval));
g.drawLine(xg,0,xg,ypixel);
x = xg + getPixel(photoWidth);
g.drawLine(x,0,x,ypixel);
}
//横向
for (int j = 0; j < yNum; j++){
yg = getPixel( top + j * (photoHeight + interval));
g.drawLine(0,yg,xpixel,yg);
y = yg + getPixel(photoHeight);
g.drawLine(0,y,xpixel,y);
}
g.dispose();
ImageIO.write(bi,"jpg",outFile);
}
/**
* 计算像素数
* 1毫米像素数=DPI/25.4
* DPI可更改 暂设300
*/
public static int getPixel(int mm){
return (int) (300/25.4)*mm;
}
}
Among them, it takes time to understand the calculation of how many photos can be arranged, as well as the functions of drawing and drawing lines.
In order to make the distance between the photo and the edge of the white background >= 2mm, the pageWidth needs to be subtracted from the interval first.
int xNum = (pageWidth - interval) / (photoWidth + interval); //横向放置个数
int yNum = (pageHeight - interval) / (photoHeight + interval);//纵向放置个数