Add post processing source files

plugins/PostProcessingPlugin/scripts/ColorChange.py

@@ -0,0 +1,76 @@
+# This PostProcessing Plugin script is released 
+# under the terms of the AGPLv3 or higher
+
+from ..Script import Script
+#from UM.Logger import Logger
+# from cura.Settings.ExtruderManager import ExtruderManager
+
+class ColorChange(Script):
+    def __init__(self):
+        super().__init__()
+
+    def getSettingDataString(self):
+        return """{
+            "name":"Color Change",
+            "key": "ColorChange",
+            "metadata": {},
+            "version": 2,
+            "settings":
+            {
+                "layer_number":
+                {
+                    "label": "Layer",
+                    "description": "At what layer should color change occur. This will be before the layer starts printing. Specify multiple color changes with a comma.",
+                    "unit": "",
+                    "type": "str",
+                    "default_value": "1"
+                },
+
+                "initial_retract":
+                {
+                    "label": "Initial Retraction",
+                    "description": "Initial filament retraction distance",
+                    "unit": "mm",
+                    "type": "float",
+                    "default_value": 300.0
+                },
+                "later_retract":
+                {
+                    "label": "Later Retraction Distance",
+                    "description": "Later filament retraction distance for removal",
+                    "unit": "mm",
+                    "type": "float",
+                    "default_value": 30.0
+                }
+            }
+        }"""
+
+    def execute(self, data: list):
+
+        """data is a list. Each index contains a layer"""
+        layer_nums = self.getSettingValueByKey("layer_number")
+        initial_retract = self.getSettingValueByKey("initial_retract")
+        later_retract = self.getSettingValueByKey("later_retract")
+        
+        color_change = "M600"
+        
+        if initial_retract is not None and initial_retract > 0.:
+            color_change = color_change + (" E%.2f" % initial_retract)
+        
+        if later_retract is not None and later_retract > 0.:
+            color_change = color_change + (" L%.2f" % later_retract)
+        
+        color_change = color_change + " ; Generated by ColorChange plugin"
+        
+        layer_targets = layer_nums.split(',')
+        if len(layer_targets) > 0:
+            for layer_num in layer_targets:
+                layer_num = int( layer_num.strip() )
+                if layer_num < len(data):
+                    layer = data[ layer_num - 1 ]
+                    lines = layer.split("\n")
+                    lines.insert(2, color_change )
+                    final_line = "\n".join( lines )
+                    data[ layer_num - 1 ] = final_line
+
+        return data