From 3c0a8071dca0de436e519a30bafb6ef701922e00 Mon Sep 17 00:00:00 2001
From: Sai Kumar <40134996+saikumarjetti@users.noreply.github.com>
Date: Mon, 2 Dec 2024 23:18:19 +0530
Subject: [PATCH] added support for new line break in stampController (#2370)

added support for new line in stampController

Co-authored-by: Anthony Stirling <77850077+Frooodle@users.noreply.github.com>
---
 .../controller/api/misc/StampController.java  | 22 ++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/src/main/java/stirling/software/SPDF/controller/api/misc/StampController.java b/src/main/java/stirling/software/SPDF/controller/api/misc/StampController.java
index b15b76e7..cdd5c5c8 100644
--- a/src/main/java/stirling/software/SPDF/controller/api/misc/StampController.java
+++ b/src/main/java/stirling/software/SPDF/controller/api/misc/StampController.java
@@ -147,7 +147,7 @@ public class StampController {
         return WebResponseUtils.pdfDocToWebResponse(
                 document,
                 Filenames.toSimpleFileName(pdfFile.getOriginalFilename())
-                                .replaceFirst("[.][^.]+$", "")
+                        .replaceFirst("[.][^.]+$", "")
                         + "_stamped.pdf");
     }
 
@@ -191,7 +191,7 @@ public class StampController {
             String fileExtension = resourceDir.substring(resourceDir.lastIndexOf("."));
             File tempFile = Files.createTempFile("NotoSansFont", fileExtension).toFile();
             try (InputStream is = classPathResource.getInputStream();
-                    FileOutputStream os = new FileOutputStream(tempFile)) {
+                 FileOutputStream os = new FileOutputStream(tempFile)) {
                 IOUtils.copy(is, os);
                 font = PDType0Font.load(document, tempFile);
             } finally {
@@ -229,10 +229,22 @@ public class StampController {
                     calculatePositionY(
                             pageSize, position, calculateTextCapHeight(font, fontSize), margin);
         }
+        // Split the stampText into multiple lines
+        String[] lines = stampText.split("\\\\n");
+
+        // Calculate dynamic line height based on font ascent and descent
+        float ascent = font.getFontDescriptor().getAscent();
+        float descent = font.getFontDescriptor().getDescent();
+        float lineHeight = ((ascent - descent) / 1000) * fontSize;
 
         contentStream.beginText();
-        contentStream.setTextMatrix(Matrix.getRotateInstance(Math.toRadians(rotation), x, y));
-        contentStream.showText(stampText);
+        for (int i = 0; i < lines.length; i++) {
+            String line = lines[i];
+            // Set the text matrix for each line with rotation
+            contentStream.setTextMatrix(
+                    Matrix.getRotateInstance(Math.toRadians(rotation), x, y - (i * lineHeight)));
+            contentStream.showText(line);
+        }
         contentStream.endText();
     }
 
@@ -327,4 +339,4 @@ public class StampController {
     private float calculateTextCapHeight(PDFont font, float fontSize) {
         return font.getFontDescriptor().getCapHeight() / 1000 * fontSize;
     }
-}
+}
\ No newline at end of file