Update version to v1.2.0

Add LaTex formula convert to image

src/main/kotlin/LaTeXConverter.kt

@@ -0,0 +1,32 @@
+package top.jie65535.mirai
+
+import org.scilab.forge.jlatexmath.TeXConstants
+import org.scilab.forge.jlatexmath.TeXFormula
+import java.awt.Color
+import java.awt.Insets
+import java.awt.image.BufferedImage
+import java.io.ByteArrayOutputStream
+import javax.imageio.ImageIO
+import javax.swing.JLabel
+
+
+object LaTeXConverter {
+    /**
+     * 转换LaTeX到图片字节数组
+     */
+    fun convertToImage(latexString: String, format: String = "png"): ByteArray {
+        val formula = TeXFormula(latexString)
+        val icon = formula.TeXIconBuilder().setStyle(TeXConstants.STYLE_DISPLAY).setSize(20f).build()
+        icon.insets = Insets(5, 5, 5, 5)
+        val image = BufferedImage(icon.iconWidth, icon.iconHeight, BufferedImage.TYPE_INT_ARGB)
+        val g2 = image.createGraphics()
+        g2.color = Color.white
+        g2.fillRect(0, 0, icon.iconWidth, icon.iconHeight)
+        val jl = JLabel()
+        jl.setForeground(Color(0, 0, 0))
+        icon.paintIcon(jl, g2, 0, 0)
+        val stream = ByteArrayOutputStream()
+        ImageIO.write(image, format, stream)
+        return stream.toByteArray()
+    }
+}