[gcode_macro LINE_PURGE]
description: A purge macro that adapts to be near your actual printed objects
gcode:
    # Get relevant printer params
    {% set travel_speed = (printer.toolhead.max_velocity) * 60 | float %}
    {% set cross_section = printer.configfile.settings.extruder.max_extrude_cross_section | float %}
    
    # Use firmware retraction if it is defined
    {% if printer.firmware_retraction is defined %}
        {% set RETRACT = G10 | string %}
        {% set UNRETRACT = G11 | string %}
    {% else %}
        {% set RETRACT = 'G1 E-.5 F2100' | string %}
        {% set UNRETRACT = 'G1 E.5 F2100' | string %}
    {% endif %}

    # Get purge settings from _Kamp_Settings
    {% set verbose_enable = printer["gcode_macro _KAMP_Settings"].verbose_enable | abs %}
    {% set purge_height = printer["gcode_macro _KAMP_Settings"].purge_height | float %}
    {% set tip_distance = printer["gcode_macro _KAMP_Settings"].tip_distance | float %}
    {% set purge_margin = printer["gcode_macro _KAMP_Settings"].purge_margin | float %}
    {% set purge_amount = printer["gcode_macro _KAMP_Settings"].purge_amount | float %}
    {% set flow_rate = printer["gcode_macro _KAMP_Settings"].flow_rate | float %}


    # Calculate purge origins and centers from objects
    {% set all_points = printer.exclude_object.objects | map(attribute='polygon') | sum(start=[]) %}    # Get all object points
    {% set purge_x_min = (all_points | map(attribute=0) | min | default(0)) %}                          # Object x min
    {% set purge_x_max = (all_points | map(attribute=0) | max | default(0)) %}                          # Object x max
    {% set purge_y_min = (all_points | map(attribute=1) | min | default(0)) %}                          # Object y min
    {% set purge_y_max = (all_points | map(attribute=1) | max | default(0)) %}                          # Object y max

    {% set purge_x_center = ([((purge_x_max + purge_x_min) / 2) - (purge_amount / 2), 0] | max) %}      # Create center point of purge line relative to print on X axis
    {% set purge_y_center = ([((purge_y_max + purge_y_min) / 2) - (purge_amount / 2), 0] | max) %}      # Create center point of purge line relative to print on Y axis

    {% set purge_x_origin = ([purge_x_min - purge_margin, 0] | max) %}                                  # Add margin to x min, compare to 0, and choose the larger
    {% set purge_y_origin = ([purge_y_min - purge_margin, 0] | max) %}                                  # Add margin to y min, compare to 0, and choose the larger

    # Calculate purge speed
    {% set purge_move_speed = (flow_rate / 5.0) * 60 | float %}

    {% if cross_section < 5 %}

        {action_respond_info("[Extruder] max_extrude_cross_section is insufficient for purge, please set it to 5 or greater. Purge skipped.")}

    {% else %}

        {% if verbose_enable == True %}

        {action_respond_info("Moving filament tip {}mms".format(                                                                 
            (tip_distance),                                                                                      
        )) }
        {% endif %}

        {% if printer.firmware_retraction is defined %}
            {action_respond_info("KAMP purge is using firmware retraction.")}
        {% else %}
            {action_respond_info("KAMP purge is not using firmware retraction, it is recommended to configure it.")}
        {% endif %}

        {% if purge_y_origin > 0 %}
        
            {action_respond_info("KAMP purge starting at {}, {} and purging {}mm of filament, requested flow rate is {}mm/s3.".format(                                                                 
                (purge_x_center),
                (purge_y_origin),
                (purge_amount),
                (flow_rate),
            )) }
    
        {% else %}
    
            {action_respond_info("KAMP purge starting at {}, {} and purging {}mm of filament, requested flow rate is {}mm/s3.".format(                                                                 
                (purge_x_origin),
                (purge_y_center),
                (purge_amount),
                (flow_rate),
            )) }

        {% endif %}

        {% if purge_y_origin > 0 %}                                                             # If there's room on Y, purge along X axis in front of print area

            G92 E0                                                                              # Reset extruder
            G0 F{travel_speed}                                                                  # Set travel speed
            G90                                                                                 # Absolute positioning
            G0 X{purge_x_center} Y{purge_y_origin}                                              # Move to purge position
            G0 Z{purge_height}                                                                  # Move to purge Z height
            M83                                                                                 # Relative extrusion mode
            G1 E{tip_distance} F{purge_move_speed}                                              # Move filament tip
            G1 X{purge_x_center + purge_amount} E{purge_amount} F{purge_move_speed}             # Purge line
            {RETRACT}                                                                           # Retract
            G92 E0                                                                              # Reset extruder distance
            M82                                                                                 # Absolute extrusion mode
            G0 Z{purge_height * 2} F{travel_speed}                                              # Z hop

        {% else %}                                                                              # If there's room on X, purge along Y axis to the left of print area
            
            G92 E0                                                                              # Reset extruder
            G0 F{travel_speed}                                                                  # Set travel speed
            G90                                                                                 # Absolute positioning
            G0 X{purge_x_origin} Y{purge_y_center}                                              # Move to purge position
            G0 Z{purge_height}                                                                  # Move to purge Z height
            M83                                                                                 # Relative extrusion mode
            G1 E{tip_distance} F{purge_move_speed}                                              # Move filament tip
            G1 Y{purge_y_center + purge_amount} E{purge_amount} F{purge_move_speed}             # Purge line
            {RETRACT}                                                                           # Retract
            G92 E0                                                                              # Reset extruder distance
            M82                                                                                 # Absolute extrusion mode
            G0 Z{purge_height * 2} F{travel_speed}                                              # Z hop

        {% endif %}
    
    {% endif %}
