3 files changed, 83 insertions, 9 deletions
diff --git a/Master/texmf-dist/doc/latex/hvextern/Changes b/Master/texmf-dist/doc/latex/hvextern/Changes
index 5543cdd49fa..9c754a92770 100644
--- a/Master/texmf-dist/doc/latex/hvextern/Changes
+++ b/Master/texmf-dist/doc/latex/hvextern/Changes
@@ -1,5 +1,6 @@
 hvextern.sty ----------------
 
+v 0.21 2022-04-30  - added java support
 v 0.20 2022-04-27  - use L3 for the comma separated lists
                      cleanup and runsequence
                    - move the config files into the main file
diff --git a/Master/texmf-dist/doc/latex/hvextern/hvextern.pdf b/Master/texmf-dist/doc/latex/hvextern/hvextern.pdf
index bdefe9bd891..963cef8772d 100644
--- a/Master/texmf-dist/doc/latex/hvextern/hvextern.pdf
+++ b/Master/texmf-dist/doc/latex/hvextern/hvextern.pdf
diff --git a/Master/texmf-dist/doc/latex/hvextern/hvextern.tex b/Master/texmf-dist/doc/latex/hvextern/hvextern.tex
index 50d93cef06f..0ad44196277 100644
--- a/Master/texmf-dist/doc/latex/hvextern/hvextern.tex
+++ b/Master/texmf-dist/doc/latex/hvextern/hvextern.tex
@@ -30,7 +30,7 @@ from within a main \LaTeX\ document~--v. \hvexternFileversion}
 \end{verbatim}
 
 \begin{sloppypar}
-This package allows to write external \MP, \TeX, \ConTeXt, \LaTeX, \LuaTeX, \LuaLaTeX, \XeTeX, \XeLaTeX, Lua, Perl and/or Python
+This package allows to write external \MP, \TeX, \ConTeXt, \LaTeX, \LuaTeX, \LuaLaTeX, \XeTeX, \XeLaTeX, Lua, Perl, Java and/or Python
 source code, which will then be run via \texttt{shell escape} to create a PDF oder text output to include
 it into the main \LaTeX\ document. 
 \end{sloppypar}
@@ -82,7 +82,7 @@ shown by the environment \texttt{externalDocument}.
 \begin{minipage}{.59\linewidth}
 \begin{lstlisting}
 \begin{externalDocument}[
-  compiler=pdflatex,force,cleanup]{Roemer1}
+  compiler=pdflatex,force,cleanup]{voss}
 \documentclass{standalone}
 %StartVisiblePreamble
 \usepackage{fontenc}
@@ -106,7 +106,7 @@ shown by the environment \texttt{externalDocument}.
 \end{minipage}
 \begin{minipage}{.39\linewidth}
 \begin{externalDocument}[
-  compiler=pdflatex,force,cleanup={log,aux},verbose]{Roemer1}
+  compiler=pdflatex,force,cleanup={log,aux},verbose]{voss}
 \documentclass{standalone}
 %StartVisiblePreamble
 \usepackage{fontenc}
@@ -261,11 +261,9 @@ image.save(imageName+".png", "PNG")
 
 
 
-
-
 \begin{externalDocument}[grfOptions={width=0.95\linewidth},
   compiler=xelatex,code,mpwidth=0.6\linewidth,
-  crop,cleanup,force,usefancyvrb=false,ext=tex]{Senger3}
+  crop,cleanup,force,usefancyvrb=false,ext=tex]{voss}
 \documentclass{article}
 %StartVisiblePreamble
 \usepackage{tikz}
@@ -400,6 +398,80 @@ Sort with xindex \verb|-l DE --config AU|
 \end{externalDocument}
 
 
+The following Java-program creates the Mandelbrot set as png image. The valid setting for 
+the environment \texttt{externalDocument} is:
+
+\begin{verbatim}
+  compiler=java,ext=java,docType=java,
+\end{verbatim}
+
+\begin{externalDocument}[
+  verbose,
+  compiler=java,ext=java,code,
+  force,docType=java,includegraphic,
+  usefancyvrb,grfOptions={width=0.9\linewidth}]{java}
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.image.BufferedImage;
+import java.awt.image.RenderedImage;
+import java.io.File;
+import javax.imageio.ImageIO;
+
+public class Main {
+
+//StartVisiblePreamble
+  public static int iterZahl(final double cx, final double cy, int maxIt, 
+                final double radius) {
+  // bestimmt Anzahl der Iterationen
+    int zaehler = 0;
+    double zx = 0.0, zy = 0.0, tmp;
+    do {
+      tmp = zx*zx - zy*zy + cx;
+      zy = 2*zx*zy + cy; zx = tmp;
+      zaehler++;
+    } while (zx*zx + zy*zy <= radius && zaehler < maxIt);
+    return zaehler;
+  }
+//StopVisiblePreamble
+  public static void main(String[] argv) throws Exception {  
+    String f_name = new File ((Main.class.getProtectionDomain().getCodeSource().getLocation().toURI()).getPath()).getName();
+    String basename = f_name.replaceAll("\\.[^.]*$", "");
+    int imageBreite = 540, imageHoehe = 405;
+    BufferedImage bufferedImage = new BufferedImage(imageBreite, imageHoehe, BufferedImage.TYPE_INT_RGB);
+    Graphics g = bufferedImage.createGraphics();
+//StartVisibleMain
+    double xa = -2.5, xe = 0.7, ya = -1.2, ye = 1.2; // Ratio 20:15 
+    double dx = (xe-xa)/(imageBreite-1), dy = (ye-ya)/(imageHoehe-1);
+    double cx, cy; int R, G, B;
+    double radius = 10.0;  int maxIt = 1024;
+    cx = xa;
+    for (int sp = 0; sp < imageBreite; sp++) {
+      cy = ye; // von oben nach unten
+      for (int ze = 0; ze < imageHoehe; ze++) {
+        int zIter = iterZahl(cx, cy, maxIt, radius);
+        if (zIter == maxIt) {
+          g.setColor(Color.WHITE);
+          g.drawLine(sp, ze, sp, ze);
+        } else { 
+          R = zIter % 4 * 6 ; G = zIter % 8 * 32; B = zIter % 16 * 16;
+          g.setColor(new Color(R,G,B));
+          g.drawLine(sp, ze, sp, ze);
+        }
+        cy = cy - dy;
+      } // for ze
+      cx = cx + dx;
+    } // for sp
+//StopVisibleMain
+    g.dispose();
+    RenderedImage rendImage = bufferedImage;
+
+    File file = new File(basename+".png");
+    ImageIO.write(rendImage, "png", file);
+  }
+}
+\end{externalDocument}
+
+
 
 
 
@@ -413,7 +485,7 @@ the follwing example.
 
 \begin{externalDocument}[grfOptions={angle=90,width=\linewidth},
   compiler=xelatex,code,mpwidth=0.6\linewidth,
-  crop,cleanup,force]{Senger3}
+  crop,cleanup,force]{voss}
 \documentclass{article}
 %StartVisiblePreamble
 \usepackage{tikz}
@@ -1305,6 +1377,7 @@ it makes no difference using the optional argument \texttt{usefancyvrb} or not.
   showFilename,
 %  crop,
   force,
+  cleanup,
   code,
   docType=mp,
   ext=mp,]{voss}
@@ -1394,7 +1467,7 @@ This is the start of the introduction.
 \begin{externalDocument}[
   grfOptions={width=0.5\linewidth},
 %  pages={1,3},
-  frame,
+%  frame,
   verbose=false,
   compiler=lualatex,
   showFilename,
@@ -1414,7 +1487,7 @@ This is the start of the introduction.
 \begin{pspicture}(-9,-15)(9,2)
 \psaxes(0,0)(-9,-15)(9,2)
 \psplot[algebraic,plotstyle=curve,curvature=1 1 0, 
-  linewidth=1pt,linecolor=red]{-8}{8}{
+  linewidth=2pt,linecolor=red]{-8}{8}{
   1 - 3876218985722260225*x^2/10892114744073986176 
     + 14975974793271450625*x^4/174273835905183778816 
     - 317095420958296875*x^6/26811359370028273664