Added conversion to HPGL with vpye.

README.md

@@ -7,6 +7,8 @@ smooth connected paths are made out of an extremely restrictive grid, like multi
 
 ## dependencies
 
+* [vpype](https://github.com/abey79/vpype), for converting to HPGL, [Installation instructions](https://github.com/abey79/vpype#installation)
+
 ## font database
 
 * figlet offical ftp at <ftp://ftp.figlet.org>

app.py

@@ -345,29 +345,45 @@ def hpgl (id):
 
     # to SVG
     svg = ascii2svg(ascii, params['weight'])
-
+    # Remove background rect inserted by SVG Bob
     svg = re.sub(r'\<rect class="backdrop" x="\d+" y="\d+" width="\d+" height="\d+">\<\/rect\>', '', svg, flags=re.M)
-
     svg = re.sub(r'<svg xmlns="http://www.w3.org/2000/svg" width="(\d+)" height="(\d+)" class="svgbob">', resizeSVG,svg)
 
-    #print(svg)
 
     # store as a temporary file
     (svg_file, svg_path) = tempfile.mkstemp('.svg')
+    (hpgl_file, hpgl_path) = tempfile.mkstemp('.hpgl')
 
     with open(svg_file, 'w') as svg_handle:
         svg_handle.write(svg)
 
-    # transform to hpgl
-    hpgl = svgToHPGL(svg_path)
+    output = subprocess.run([
+        "vpype",
+        "read",
+            "--single-layer",
+            svg_path,
+        "scaleto",
+            "297mm", "420mm",
+        "linemerge",
+            "-t", "0.25mm",
+        "linesort",
+        "write",
+            "--device", "dxy",
+            "--color-mode", "none",
+            "--page-size", "a3",
+            "--landscape",
+            hpgl_path
+    ])
+
+    with open(hpgl_file, 'r') as hpgl_handle:
+        r = Response(hpgl_handle.read(), mimetype='application/hpgl')
+        r.headers.extend({
+            'Content-Disposition': 'attachment; filename="cobbled-paths.hpgl"'
+        })
 
     # remove tmp file
     os.remove(svg_path)
-
-    r = Response(hpgl, mimetype='application/hpgl')
-    r.headers.extend({
-        'Content-Disposition': 'attachment; filename="cobbled-paths.hpgl"'
-    })
+    os.remove(hpgl_path)
     return r
 
 if __name__ == '__main__':