Add configurable X/Y offset parameters for plotter positioning

- Added offset-x and offset-y parameters to plotter-lod.inx (default: X=180, Y=0)
- Updated plotter-lod.py to apply offsets to all G-code coordinates
- Modified footer to use dynamic offset values
- Allows users to adjust plotter start position through GUI without code changes

plotter-lod.py

@@ -134,6 +134,7 @@ G0 Z0
     'footer': """G1 X0 Y0
 
 """
+    # Note: footer will be dynamically updated with offset values in check_dir()
 }
 
 intersection_recursion_depth = 10
@@ -642,6 +643,12 @@ class LaserGcode(inkex.Effect):
             {"name": "--plotter-off-delay", "type": str, "dest": "plotter_off_delay",
              "default": "0", "help": "Laser power-on delay (ms},"},
 
+            {"name": "--offset-x", "type": float, "dest": "offset_x",
+             "default": 180.0, "help": "X axis offset (mm or in)"},
+
+            {"name": "--offset-y", "type": float, "dest": "offset_y",
+             "default": 0.0, "help": "Y axis offset (mm or in)"},
+
             {"name": "--suppress-all-messages", "type": inkex.Boolean,
              "dest": "suppress_all_messages", "default": True,
              "help": "Hide messages during g-code generation"},
@@ -825,6 +832,9 @@ class LaserGcode(inkex.Effect):
                 f.close()
             else:
                 self.footer = defaults['footer']
+            
+            # Always apply dynamic offset values to footer
+            self.footer = "G1 X%s Y%s\n\n" % (self.options.offset_x, self.options.offset_y)
 
             if self.options.unit == "G21 (All units in mm)":
                 self.header += "G21\n"
@@ -878,6 +888,11 @@ class LaserGcode(inkex.Effect):
         def c(c):
             c = [c[i] if i < len(c) else None for i in range(6)]
             if c[5] == 0: c[5] = None
+            # Apply plotter offset from options
+            if c[0] != None:
+                c[0] = c[0] + self.options.offset_x
+            if c[1] != None:
+                c[1] = c[1] + self.options.offset_y
             s = [" X", " Y", " Z", " I", " J", " K"]
             r = ''
             for i in range(6):