1 files changed, 138 insertions, 0 deletions
diff --git a/src/libslic3r/Extruder.cpp b/src/libslic3r/Extruder.cpp
new file mode 100644
index 000000000..74d900825
--- /dev/null
+++ b/src/libslic3r/Extruder.cpp
@@ -0,0 +1,138 @@
+#include "Extruder.hpp"
+
+namespace Slic3r {
+
+Extruder::Extruder(unsigned int id, GCodeConfig *config) :
+    m_id(id),
+    m_config(config)
+{
+    reset();
+    
+    // cache values that are going to be called often
+    m_e_per_mm3 = this->extrusion_multiplier();
+    if (! m_config->use_volumetric_e)
+        m_e_per_mm3 /= this->filament_crossection();
+}
+
+double Extruder::extrude(double dE)
+{
+    // in case of relative E distances we always reset to 0 before any output
+    if (m_config->use_relative_e_distances)
+        m_E = 0.;
+    m_E          += dE;
+    m_absolute_E += dE;
+    if (dE < 0.)
+        m_retracted -= dE;
+    return dE;
+}
+
+/* This method makes sure the extruder is retracted by the specified amount
+   of filament and returns the amount of filament retracted.
+   If the extruder is already retracted by the same or a greater amount, 
+   this method is a no-op.
+   The restart_extra argument sets the extra length to be used for
+   unretraction. If we're actually performing a retraction, any restart_extra
+   value supplied will overwrite the previous one if any. */
+double Extruder::retract(double length, double restart_extra)
+{
+    // in case of relative E distances we always reset to 0 before any output
+    if (m_config->use_relative_e_distances)
+        m_E = 0.;
+    double to_retract = std::max(0., length - m_retracted);
+    if (to_retract > 0.) {
+        m_E             -= to_retract;
+        m_absolute_E    -= to_retract;
+        m_retracted     += to_retract;
+        m_restart_extra = restart_extra;
+    }
+    return to_retract;
+}
+
+double Extruder::unretract()
+{
+    double dE = m_retracted + m_restart_extra;
+    this->extrude(dE);
+    m_retracted     = 0.;
+    m_restart_extra = 0.;
+    return dE;
+}
+
+// Used filament volume in mm^3.
+double Extruder::extruded_volume() const
+{
+    return m_config->use_volumetric_e ? 
+        m_absolute_E + m_retracted :
+        this->used_filament() * this->filament_crossection();
+}
+
+// Used filament length in mm.
+double Extruder::used_filament() const
+{
+    return m_config->use_volumetric_e ?
+        this->extruded_volume() / this->filament_crossection() :
+        m_absolute_E + m_retracted;
+}
+
+double Extruder::filament_diameter() const
+{
+    return m_config->filament_diameter.get_at(m_id);
+}
+
+double Extruder::filament_density() const
+{
+    return m_config->filament_density.get_at(m_id);
+}
+
+double Extruder::filament_cost() const
+{
+    return m_config->filament_cost.get_at(m_id);
+}
+
+double Extruder::extrusion_multiplier() const
+{
+    return m_config->extrusion_multiplier.get_at(m_id);
+}
+
+// Return a "retract_before_wipe" percentage as a factor clamped to <0, 1>
+double Extruder::retract_before_wipe() const
+{
+    return std::min(1., std::max(0., m_config->retract_before_wipe.get_at(m_id) * 0.01));
+}
+
+double Extruder::retract_length() const
+{
+    return m_config->retract_length.get_at(m_id);
+}
+
+double Extruder::retract_lift() const
+{
+    return m_config->retract_lift.get_at(m_id);
+}
+
+int Extruder::retract_speed() const
+{
+    return int(floor(m_config->retract_speed.get_at(m_id)+0.5));
+}
+
+int Extruder::deretract_speed() const
+{
+    int speed = int(floor(m_config->deretract_speed.get_at(m_id)+0.5));
+    return (speed > 0) ? speed : this->retract_speed();
+}
+
+double Extruder::retract_restart_extra() const
+{
+    return m_config->retract_restart_extra.get_at(m_id);
+}
+
+double Extruder::retract_length_toolchange() const
+{
+    return m_config->retract_length_toolchange.get_at(m_id);
+}
+
+double Extruder::retract_restart_extra_toolchange() const
+{
+    return m_config->retract_restart_extra_toolchange.get_at(m_id);
+}
+
+}