楚江ERP：规格展示优化，提高图片质量

@@ -77,61 +77,57 @@ public class LatexFormulaExcelExporterUtil {
     }
 
     /**
-     * 将LaTeX公式字符串渲染为图片字节数组
-     *
-     * @param latex    LaTeX公式字符串，如 "\\frac{-b \\pm \\sqrt{b^2-4ac}}{2a}"
-     * @param fontSize 渲染的字体大小
-     * @return 图片的字节数组 (PNG格式)
-     * @throws IOException 如果渲染或转换失败
+     * 针对Excel优化的高质量渲染
      */
     public static byte[] latexToImageBytes(String latex, int fontSize) throws IOException {
         try {
-            // 1. 创建TeXFormula对象，解析LaTeX字符串
+            // 对于Excel，使用适中的缩放和RGB格式
+            double scale = 1.5; // 1.5倍缩放平衡质量和文件大小
             TeXFormula formula = new TeXFormula(latex);
-
-            // 2. 创建TeXIcon，指定样式和大小
             TeXIcon icon = formula.createTeXIcon(TeXConstants.STYLE_DISPLAY, fontSize);
 
-            // 3. 创建一个BufferedImage，用于绘制公式
+            int baseWidth = icon.getIconWidth();
+            int baseHeight = icon.getIconHeight();
+            int scaledWidth = (int) (baseWidth * scale);
+            int scaledHeight = (int) (baseHeight * scale);
+
+            // 使用RGB类型，Excel兼容性更好
             BufferedImage image = new BufferedImage(
-                    icon.getIconWidth(),
-                    icon.getIconHeight(),
-                    BufferedImage.TYPE_INT_ARGB
+                    scaledWidth,
+                    scaledHeight,
+                    BufferedImage.TYPE_INT_RGB
             );
 
-            // 4. 获取Graphics2D进行绘制
             Graphics2D g2 = image.createGraphics();
 
-            // 设置最高质量的渲染提示
+            // 针对公式渲染优化的设置
             g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
-            g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HRGB);
+            g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
             g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
             g2.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
-            g2.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
-            g2.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
-            g2.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
-            g2.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
 
-            // 设置背景为白色
+            // 绘制白色背景
             g2.setColor(Color.WHITE);
-            g2.fillRect(0, 0, icon.getIconWidth(), icon.getIconHeight());
+            g2.fillRect(0, 0, scaledWidth, scaledHeight);
+
+            // 应用缩放
+            g2.scale(scale, scale);
 
-            // 设置公式颜色为黑色
+            // 绘制公式
             JLabel label = new JLabel();
             label.setForeground(Color.BLACK);
-
-            // 5. 将公式绘制到BufferedImage上
             icon.paintIcon(label, g2, 0, 0);
+
             g2.dispose();
 
-            // 6. 将BufferedImage转换为字节数组
+            // 使用标准PNG编码，确保Excel兼容性
             ByteArrayOutputStream baos = new ByteArrayOutputStream();
             ImageIO.write(image, "png", baos);
 
             return baos.toByteArray();
 
         } catch (Exception e) {
-            throw new IOException("LaTeX渲染失败: " + e.getMessage(), e);
+            throw new IOException("LaTeX Excel优化渲染失败: " + e.getMessage(), e);
         }
     }