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- import JAVA.awt.Color;
- import java.awt.Graphics2D;
- import java.awt.Insets;
- import java.awt.Transparency;
- import java.awt.image.BufferedImage;
- import java.io.ByteArrayOutputStream;
- import java.io.File;
- import java.io.IOException;
- import javax.imageio.ImageIO;
- import javax.swing.JLabel;
- import org.scilab.forge.jlatexmath.TeXConstants;
- import org.scilab.forge.jlatexmath.TeXFormula;
- import org.scilab.forge.jlatexmath.TeXIcon;
- import sun.misc.BASE64Encoder;
-
- public class Latex2Png {
-
- // latex 转 imgbase64
- public static boolean latex2Png(String latex, String filePath) {
- String suffix = filePath.substring(filePath.lastIndexOf(".") + 1);
- BufferedImage bufferedImage = latex2BuImage(latex);
- if (null == bufferedImage) {
- return false;
- }
- try {
- File file = new File(filePath);
- File pFile = file.getParentFile();
- if (!pFile.exists()) {
- pFile.mkdirs();
- }
- ImageIO.write(bufferedImage, suffix, file);
- return true;
- } catch (IOException e) {
- e.printStackTrace();
- return false;
- }
- }
-
- // latex 转 imgbase64
- public static String latex2Png(String latex) {
- BufferedImage bufferedImage = latex2BuImage(latex);
- ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
- try {
- ImageIO.write(bufferedImage, "png", outputStream);
- } catch (IOException e) {
- e.printStackTrace();
- return null;
- }
- byte[] buffer = outputStream.toByteArray();
- BASE64Encoder encoder = new BASE64Encoder();
- return ("data:image/png;base64," + encoder.encode(buffer));
- }
-
- private static BufferedImage latex2BuImage(String drawStr) {
- try {
- TeXFormula formula = new TeXFormula(drawStr);
- TeXIcon icon = formula
- .createTeXIcon(TeXConstants.STYLE_DISPLAY, 40);
- icon.setInsets(new Insets(5, 5, 5, 5));
-
- int width = icon.getIconWidth();
- int height = icon.getIconHeight();
-
- JLabel jl = new JLabel();
- jl.setForeground(new Color(0, 0, 0));
-
- BufferedImage buffImg = new BufferedImage(width, height,
- BufferedImage.TYPE_INT_RGB);
- Graphics2D gd = buffImg.createGraphics();
- buffImg = gd.getDeviceConfiguration().createCompatibleImage(width,
- height, Transparency.TRANSLUCENT);
- gd = buffImg.createGraphics();
- gd.setColor(Color.white);
- icon.paintIcon(jl, gd, 0, 0);
-
- return buffImg;
- } catch (Exception e) {
- System.err.println("公式解析有误:\n" + drawStr);
- e.printStackTrace();
- return null;
- }
- }
-
- }
复制代码
写了个小Demo,将公式字符串例如“$$R_x=N_xP_xL_x$$”转为公式,公式见图“公式样式”。
用到的jar包jlatexmath主要用来将字符串转为公式,Graphics2D主要就是用来绘制图形。直接上代码。 |
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