Multimaterial initial priming for non-Prusa printers (https://github.com/prusa3d/PrusaSlicer/issues/1121)

The initial priming now does not assume anything about bed width and always uses the space it has
In case of circular beds it places the priming lines along the diameter
Custom beds are not supported (they are treated as circular with no extra checks whether it is sane)
Slight refactoring of the WipeTower class (constructor now gets reference to PrintConfig and not the individual values, same with set_extruder). This was legacy from times when the wipe tower was meant to be abstract and independent on the rest)

src/libslic3r/GCode/WipeTower.cpp

@@ -22,6 +22,7 @@ TODO LIST
 #include <numeric>
 
 #include "Analyzer.hpp"
+#include "BoundingBox.hpp"
 
 #if defined(__linux) || defined(__GNUC__ )
 #include <strings.h>
@@ -470,6 +471,83 @@ private:
 
 
 
+WipeTower::WipeTower(const PrintConfig& config, const std::vector<std::vector<float>>& wiping_matrix, size_t initial_tool) :
+    m_semm(config.single_extruder_multi_material.value),
+    m_wipe_tower_pos(config.wipe_tower_x, config.wipe_tower_y),
+    m_wipe_tower_width(config.wipe_tower_width),
+    m_wipe_tower_rotation_angle(config.wipe_tower_rotation_angle),
+    m_y_shift(0.f),
+    m_z_pos(0.f),
+    m_is_first_layer(false),
+    m_bridging(config.wipe_tower_bridging),
+    m_gcode_flavor(config.gcode_flavor),
+    m_current_tool(initial_tool),
+    wipe_volumes(wiping_matrix)
+{
+    // If this is a single extruder MM printer, we will use all the SE-specific config values.
+    // Otherwise, the defaults will be used to turn off the SE stuff.
+    if (m_semm) {
+        m_cooling_tube_retraction = config.cooling_tube_retraction;
+        m_cooling_tube_length = config.cooling_tube_length;
+        m_parking_pos_retraction = config.parking_pos_retraction;
+        m_extra_loading_move = config.extra_loading_move;
+        m_set_extruder_trimpot = config.high_current_on_filament_swap;
+    }
+    // Calculate where the priming lines should be - very naive test not detecting parallelograms or custom shapes
+    const std::vector<Vec2d>& bed_points = config.bed_shape.values;
+    m_bed_shape = (bed_points.size() == 4 ? RectangularBed : CircularBed);
+    m_bed_width = BoundingBoxf(bed_points).size().x();
+}
+
+
+
+void WipeTower::set_extruder(size_t idx, const PrintConfig& config)
+{
+    //while (m_filpar.size() < idx+1)   // makes sure the required element is in the vector
+    m_filpar.push_back(FilamentParameters());
+
+    m_filpar[idx].material = config.filament_type.get_at(idx);
+    m_filpar[idx].temperature = config.temperature.get_at(idx);
+    m_filpar[idx].first_layer_temperature = config.first_layer_temperature.get_at(idx);
+
+    // If this is a single extruder MM printer, we will use all the SE-specific config values.
+    // Otherwise, the defaults will be used to turn off the SE stuff.
+    if (m_semm) {
+        m_filpar[idx].loading_speed           = config.filament_loading_speed.get_at(idx);
+        m_filpar[idx].loading_speed_start     = config.filament_loading_speed_start.get_at(idx);
+        m_filpar[idx].unloading_speed         = config.filament_unloading_speed.get_at(idx);
+        m_filpar[idx].unloading_speed_start   = config.filament_unloading_speed_start.get_at(idx);
+        m_filpar[idx].delay                   = config.filament_toolchange_delay.get_at(idx);
+        m_filpar[idx].cooling_moves           = config.filament_cooling_moves.get_at(idx);
+        m_filpar[idx].cooling_initial_speed   = config.filament_cooling_initial_speed.get_at(idx);
+        m_filpar[idx].cooling_final_speed     = config.filament_cooling_final_speed.get_at(idx);
+    }
+
+    m_filpar[idx].filament_area = float((M_PI/4.f) * pow(config.filament_diameter.get_at(idx), 2)); // all extruders are assumed to have the same filament diameter at this point
+    float nozzle_diameter = config.nozzle_diameter.get_at(idx);
+    m_filpar[idx].nozzle_diameter = nozzle_diameter; // to be used in future with (non-single) multiextruder MM
+
+    float max_vol_speed = config.filament_max_volumetric_speed.get_at(idx);
+    if (max_vol_speed!= 0.f)
+        m_filpar[idx].max_e_speed = (max_vol_speed / filament_area());
+
+    m_perimeter_width = nozzle_diameter * Width_To_Nozzle_Ratio; // all extruders are now assumed to have the same diameter
+
+    if (m_semm) {
+        std::istringstream stream{config.filament_ramming_parameters.get_at(idx)};
+        float speed = 0.f;
+        stream >> m_filpar[idx].ramming_line_width_multiplicator >> m_filpar[idx].ramming_step_multiplicator;
+        m_filpar[idx].ramming_line_width_multiplicator /= 100;
+        m_filpar[idx].ramming_step_multiplicator /= 100;
+        while (stream >> speed)
+            m_filpar[idx].ramming_speed.push_back(speed);
+    }
+
+    m_used_filament_length.resize(std::max(m_used_filament_length.size(), idx + 1)); // makes sure that the vector is big enough so we don't have to check later
+}
+
+
+
 // Returns gcode to prime the nozzles at the front edge of the print bed.
 std::vector<WipeTower::ToolChangeResult> WipeTower::prime(
 	// print_z of the first layer.
@@ -488,9 +566,11 @@ std::vector<WipeTower::ToolChangeResult> WipeTower::prime(
     // therefore the homing position is shifted inside the bed by 0.2 in the firmware to [0.2, -2.0].
 //	box_coordinates cleaning_box(xy(0.5f, - 1.5f), m_wipe_tower_width, wipe_area);
 
-	const float prime_section_width = std::min(240.f / tools.size(), 60.f);
-	box_coordinates cleaning_box(Vec2f(5.f, 0.01f + m_perimeter_width/2.f), prime_section_width, 100.f);
-
+    float prime_section_width = std::min(0.9f * m_bed_width / tools.size(), 60.f);
+    box_coordinates cleaning_box(Vec2f(0.02f * m_bed_width, 0.01f + m_perimeter_width/2.f), prime_section_width, 100.f);
+    // In case of a circular bed, place it so it goes across the diameter and hope it will fit
+    if (m_bed_shape == CircularBed)
+        cleaning_box.translate(-m_bed_width/2 + m_bed_width * 0.03f, -m_bed_width * 0.12f);
 
     std::vector<ToolChangeResult> results;