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import bpy

class GREASEPENCIL_OT_trace(bpy.types.Operator):

bl_label = "Trace"

bl_idname = "grease_writer.trace"

bl_description = "Trace the strokes with a given object to the X Y & Z coords of the drawing"

bl_options = {"REGISTER", "UNDO"}

@classmethod

def poll(self, context):

obj = bpy.context.view_layer.objects.active

gpencil = obj.data

if (len(gpencil.layers) > 0 and

len(gpencil.layers[0].frames) > 0 and

gpencil.tracer_obj != ''):

return True

else:

return False

def execute(self, context):

obj = bpy.context.view_layer.objects.active

gpencil = obj.data

layer = gpencil.layers[0]

tracer = bpy.data.objects[gpencil.tracer_obj]

for i in range(len(layer.frames)):

frame = layer.frames[i]

if i == 1:

vertex = frame.strokes[-1].points[0]

tracer.location[0] = vertex.co.x + obj.location[0]

tracer.location[1] = vertex.co.y + obj.location[1]

tracer.keyframe_insert(data_path="location", index=0, frame=frame.frame_number - 1)

tracer.keyframe_insert(data_path="location", index=1, frame=frame.frame_number - 1)

if not gpencil.trace2d:

tracer.location[2] = vertex.co.z + obj.location[2]

tracer.keyframe_insert(data_path="location", index=2, frame=frame.frame_number - 1)

if (len(frame.strokes) > 0):

vertex = frame.strokes[-1].points[-1]

tracer.location[0] = vertex.co.x + obj.location[0]

tracer.location[1] = vertex.co.y + obj.location[1]

tracer.keyframe_insert(data_path="location", index=0, frame=frame.frame_number - 1)

tracer.keyframe_insert(data_path="location", index=1, frame=frame.frame_number - 1)

if not gpencil.trace2d:

tracer.location[2] = vertex.co.z + obj.location[2]

tracer.keyframe_insert(data_path="location", index=2, frame=frame.frame_number - 1)

return {"FINISHED"}