fix(sigblock): invalid preview in case of sig-blocks with more than half page height

Issue: #68

## Info:
This is only a work-around, because it looks like a general issue in methods to create visual signature tables.
T

1 files changed, 37 insertions, 0 deletions

diff --git a/pdf-as-cli/src/test/java/at/gv/egiz/pdfas/cli/test/SigblockPreviewMain.java b/pdf-as-cli/src/test/java/at/gv/egiz/pdfas/cli/test/SigblockPreviewMain.java
new file mode 100644
index 00000000..dba52463
--- /dev/null
+++ b/pdf-as-cli/src/test/java/at/gv/egiz/pdfas/cli/test/SigblockPreviewMain.java
@@ -0,0 +1,37 @@
+package at.gv.egiz.pdfas.cli.test;
+
+import java.awt.Image;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.FileInputStream;
+
+import javax.imageio.ImageIO;
+
+import at.gv.egiz.pdfas.lib.api.PdfAs;
+import at.gv.egiz.pdfas.lib.api.PdfAsFactory;
+import at.gv.egiz.pdfas.lib.api.sign.SignParameter;
+import iaik.x509.X509Certificate;
+import lombok.SneakyThrows;
+
+public class SigblockPreviewMain {
+
+  private static final String PDFAS_CONFIG_DIR = "/home/tlenz/Projekte/pdfas4/config/default_4.2.0/";
+ 
+
+  @SneakyThrows
+  public static void main(String[] args) throws Exception {
+    String cwd = System.getProperty("user.dir");
+    File output = new File(cwd + File.separator + "build/output.png");
+    X509Certificate cert = new X509Certificate(new FileInputStream("/home/tlenz/diverses/cert_debug/binding3.pem"));
+
+    PdfAs pdfas = PdfAsFactory.createPdfAs(new File(PDFAS_CONFIG_DIR));
+    SignParameter param = PdfAsFactory.createSignParameter(pdfas.getConfiguration(), null, null);
+    param.setSignatureProfileId("ERROR_LOGO");    
+    //param.setSignatureProfileId("SIGNATURBLOCK_DE");
+    
+    
+    Image placeholder = pdfas.generateVisibleSignaturePreview(param, cert, 72 * 4);
+    ImageIO.write((BufferedImage)placeholder, "png", output);
+  }
+
+}