Made scale_factor optional for cli, added more comments, removed redundant code

FlatCAMApp.py

@@ -1710,7 +1710,7 @@ class App(QtCore.QObject):
             self.inform.emit("Project copy saved to: " + self.project_filename)
 
 
-    def export_svg(self, obj_name, filename, outname=None):
+    def export_svg(self, obj_name, filename, scale_factor=0.00):
         """
         Exports a Geometry Object to a SVG File
 
@@ -1726,11 +1726,7 @@ class App(QtCore.QObject):
             return "Could not retrieve object: %s" % obj_name
 
         with self.proc_container.new("Exporting SVG") as proc:
-            exported_svg = obj.export_svg()
-
-            # Sometimes obj.solid_geometry can be a list instead of a Shapely class
-            # Make sure we see it as a Shapely Geometry class
-            geom = cascaded_union(obj.flatten())
+            exported_svg = obj.export_svg(scale_factor=scale_factor)
 
             # Determine bounding area for svg export
             bounds = obj.bounds()
@@ -2206,9 +2202,16 @@ class App(QtCore.QObject):
 
             return str(self.collection.get_names())
 
-        def export_svg(name, filename):
+        def export_svg(name, filename, *args):
+            a, kwa = h(*args)
+            types = {'scale_factor': float}
 
-            self.export_svg(str(name), str(filename))
+            for key in kwa:
+                if key not in types:
+                    return 'Unknown parameter: %s' % key
+                kwa[key] = types[key](kwa[key])
+
+            self.export_svg(str(name), str(filename), **kwa)
 
         def import_svg(filename, *args):
             a, kwa = h(*args)
@@ -3329,9 +3332,10 @@ class App(QtCore.QObject):
             'export_svg': {
                 'fcn': export_svg,
                 'help': "Export a Geometry Object as a SVG File\n" +
-                        "> export_svg <name> <filename>\n" +
+                        "> export_svg <name> <filename> [-scale_factor <0.0 (float)>]\n" +
                         "   name: Name of the geometry object to export.\n" +
-                        "   filename: Path to the file to export."
+                        "   filename: Path to the file to export.\n" +
+                        "   scale_factor: Multiplication factor used for scaling line widths during export."
             },
             'open_gerber': {
                 'fcn': open_gerber,

camlib.py

@@ -869,18 +869,25 @@ class Geometry(object):
         """
         self.solid_geometry = [cascaded_union(self.solid_geometry)]
 
-    def export_svg(self):
+    def export_svg(self, scale_factor=0.00):
         """
         Exports the Gemoetry Object as a SVG Element
 
         :return: SVG Element
         """
-        # Sometimes self.solid_geometry can be a list instead of a Shapely class
-        # Make sure we see it as a Shapely Geometry class
+        # Make sure we see a Shapely Geometry class and not a list
         geom = cascaded_union(self.flatten())
 
+        # scale_factor is a multiplication factor for the SVG stroke-width used within shapely's svg export
+
+        # If 0 or less which is invalid then default to 0.05
+        # This value appears to work for zooming, and getting the output svg line width
+        # to match that viewed on screen with FlatCam
+        if scale_factor <= 0:
+            scale_factor = 0.05
+
         # Convert to a SVG
-        svg_elem = geom.svg(scale_factor=0.05)
+        svg_elem = geom.svg(scale_factor=scale_factor)
         return svg_elem
 
 class ApertureMacro:
@@ -3326,17 +3333,26 @@ class CNCjob(Geometry):
 
         self.create_geometry()
 
-    def export_svg(self):
+    def export_svg(self, scale_factor=0.00):
         """
         Exports the CNC Job as a SVG Element
 
-        :return: SVG Element
+        :scale_factor: float
+        :return: SVG Element string
         """
+        # scale_factor is a multiplication factor for the SVG stroke-width used within shapely's svg export
+        # If not specified then try and use the tool diameter
+        # This way what is on screen will match what is outputed for the svg
+        # This is quite a useful feature for svg's used with visicut
 
-        # This appears to match up distance wise with inkscape
-        scale = self.options['tooldia'] / 2
-        if scale == 0:
-            scale = 0.05
+        if scale_factor <= 0:
+            scale_factor = self.options['tooldia'] / 2
+
+        # If still 0 then defailt to 0.05
+        # This value appears to work for zooming, and getting the output svg line width
+        # to match that viewed on screen with FlatCam
+        if scale_factor == 0:
+            scale_factor = 0.05
 
         # Seperate the list of cuts and travels into 2 distinct lists
         # This way we can add different formatting / colors to both
@@ -3360,9 +3376,9 @@ class CNCjob(Geometry):
         # It's better to have the travels sitting underneath the cuts for visicut
         svg_elem = ""
         if travels:
-            svg_elem = travelsgeom.svg(scale_factor=scale, stroke_color="#F0E24D")
+            svg_elem = travelsgeom.svg(scale_factor=scale_factor, stroke_color="#F0E24D")
         if cuts:
-            svg_elem += cutsgeom.svg(scale_factor=scale, stroke_color="#5E6CFF")
+            svg_elem += cutsgeom.svg(scale_factor=scale_factor, stroke_color="#5E6CFF")
 
         return svg_elem