Patch from Lubomír Bláha applied. Polished comments and PngExportDialog.

README.md

@@ -128,6 +128,7 @@ The author of the Silk icon set is Mark James.
         --post-process      Generated G-code will be processed with the supplied script;
                             call this more than once to process through multiple scripts.
         --export-svg        Export a SVG file containing slices instead of G-code.
+        --export-png        Export zipped PNG files containing slices instead of G-code.
         -m, --merge         If multiple files are supplied, they will be composed into a single
                             print rather than processed individually.
     

slic3r.pl

@@ -43,6 +43,7 @@ my %cli_options = ();
         'gui-mode=s'            => \$opt{obsolete_ignore_this_option_gui_mode},
         'datadir=s'             => \$opt{datadir},
         'export-svg'            => \$opt{export_svg},
+        'export-png'            => \$opt{export_png},
         'merge|m'               => \$opt{merge},
         'repair'                => \$opt{repair},
         'cut=f'                 => \$opt{cut},
@@ -217,6 +218,8 @@ if (@ARGV) {  # slicing from command line
         
         if ($opt{export_svg}) {
             $sprint->export_svg;
+        } elsif ($opt{export_png}) {
+            $sprint->export_png;
         } else {
             my $t0 = [gettimeofday];
             # The following call may die if the output_filename_format template substitution fails,
@@ -282,6 +285,7 @@ Usage: slic3r.pl [ OPTIONS ] [ file.stl ] [ file2.stl ] ...
     --post-process      Generated G-code will be processed with the supplied script;
                         call this more than once to process through multiple scripts.
     --export-svg        Export a SVG file containing slices instead of G-code.
+    --export-png        Export zipped PNG files containing slices instead of G-code.
     -m, --merge         If multiple files are supplied, they will be composed into a single 
                         print rather than processed individually.
   

xs/src/slic3r/AppController.hpp

@@ -17,14 +17,15 @@ class PrintObject;
 
 /**
  * @brief A boilerplate class for creating application logic. It should provide
- * features as issue reporting, gauge and progress indication, etc...
+ * features as issue reporting and progress indication, etc...
  *
- * The lower lever UI independent classes should be manipulated with a subclass
+ * The lower lever UI independent classes can be manipulated with a subclass
  * of this controller class. We can also catch any exceptions that lower level
  * methods could throw and display appropriate errors and warnings.
  *
- * Note that even the inner interface of this class free from any UI toolkit.
+ * Note that the outer and the inner interface of this class is free from any
- * We can implement it with any UI framework or make it a cli client.
+ * UI toolkit dependencies. We can implement it with any UI framework or make it
+ * a cli client.
  */
 class AppControllerBoilerplate {
     class PriMap;   // Some structure to store progress indication data
@@ -73,7 +74,7 @@ public:
             const std::string& title) const;
 
     /**
-     * @brief Same as query_destination_path but returns only one path.
+     * @brief Same as query_destination_paths but returns only one path.
      */
     Path query_destination_path(
             const std::string& title,
@@ -124,7 +125,7 @@ public:
      * created the AppConroller object itself. This probably means that the
      * execution is in the UI thread. Otherwise it returns false meaning that
      * some worker thread called this function.
-     * @return Return true if for the same caller thread that created this
+     * @return Return true for the same caller thread that created this
      * object and false for every other.
      */
     bool is_main_thread() const;
@@ -132,7 +133,7 @@ public:
 protected:
 
     /**
-     * @brief Create a new progress indicator and retirn a smart pointer to it.
+     * @brief Create a new progress indicator and return a smart pointer to it.
      * @param statenum The number of states for the given procedure.
      * @param title The title of the procedure.
      * @param firstmsg The message for the first subtask to be displayed.
@@ -143,7 +144,8 @@ protected:
             const std::string& title,
             const std::string& firstmsg = "") const;
 
-    // This is a global
+    // This is a global progress indicator placeholder. In the Slic3r UI it can
+    // contain the progress indicator on the statusbar.
     ProgresIndicatorPtr global_progressind_;
 };
 
@@ -162,16 +164,19 @@ protected:
     void infill(PrintObject *pobj);
     void gen_support_material(PrintObject *pobj);
 
+    // Data structure with the png export input data
     struct PngExportData {
-        std::string zippath;
+        std::string zippath;                        // output zip file
-        unsigned long width_px = 1440;
+        unsigned long width_px = 1440;              // resolution - rows
-        unsigned long height_px = 2560;
+        unsigned long height_px = 2560;             // resolution columns
-        double width_mm = 68.0, height_mm = 120.0;
+        double width_mm = 68.0, height_mm = 120.0;  // dimensions in mm
-        double corr = 1.0;
+        double corr = 1.0;                          // multiplies the dimensions
     };
 
+    // Should display a dialog with the input fields for printing to png
     PngExportData query_png_export_data();
 
+    // The previous export data, to pre-populate the dialog
     PngExportData prev_expdata_;
 
 public:

xs/src/slic3r/AppControllerWx.cpp

@@ -13,6 +13,11 @@
 #include <wx/statusbr.h>
 #include <wx/event.h>
 
+// This source file implements the UI dependent methods of the AppControllers.
+// It will be clear what is needed to be reimplemented in case of a UI framework
+// change or a CLI client creation. In this particular case we use wxWidgets to
+// implement everything.
+
 namespace Slic3r {
 
 AppControllerBoilerplate::PathList
@@ -73,6 +78,11 @@ void AppControllerBoilerplate::report_issue(IssueType issuetype,
 wxDEFINE_EVENT(PROGRESS_STATUS_UPDATE_EVENT, wxCommandEvent);
 
 namespace  {
+
+/*
+ * A simple thread safe progress dialog implementation that can be used from
+ * the main thread as well.
+ */
 class GuiProgressIndicator:
         public IProgressIndicator, public wxEvtHandler {
 
@@ -91,6 +101,7 @@ class GuiProgressIndicator:
         _state(st);
     }
 
+    // Status update implementation
     void _state( unsigned st) {
         if(st < max()) {
             if(!gauge_) gauge_ = std::make_shared<wxProgressDialog>(
@@ -114,7 +125,10 @@ class GuiProgressIndicator:
 
 public:
 
+    /// Setting whether it will be used from the UI thread or some worker thread
     inline void asynch(bool is) { is_asynch_ = is; }
+
+    /// Get the mode of parallel operation.
     inline bool asynch() const { return is_asynch_; }
 
     inline GuiProgressIndicator(int range, const std::string& title,
@@ -167,12 +181,16 @@ AppControllerBoilerplate::create_progress_indicator(
     auto pri =
             std::make_shared<GuiProgressIndicator>(statenum, title, firstmsg);
 
+    // We set up the mode of operation depending of the creator thread's
+    // identity
     pri->asynch(!is_main_thread());
 
     return pri;
 }
 
 namespace {
+
+// A wrapper progress indicator class around the statusbar created in perl.
 class Wrapper: public IProgressIndicator, public wxEvtHandler {
     wxGauge *gauge_;
     wxStatusBar *stbar_;
@@ -264,6 +282,7 @@ void AppController::set_global_progress_indicator(
 PrintController::PngExportData PrintController::query_png_export_data()
 {
 
+    // Implement the logic of the PngExportDialog
     class PngExportView: public PngExportDialog {
         double ratio_, bs_ratio_;
     public:
@@ -308,26 +327,28 @@ PrintController::PngExportData PrintController::query_png_export_data()
 
         virtual void EvalResoSpin( wxCommandEvent& event ) override {
             if(reso_lock_btn_->GetValue()) {
-
                 if(event.GetId() == spin_reso_width_->GetId()) {
                     spin_reso_height_->SetValue(
                             std::round(spin_reso_width_->GetValue()/ratio_));
+                    spin_reso_height_->Update();
                 } else {
                     spin_reso_width_->SetValue(
                             std::round(spin_reso_height_->GetValue()*ratio_));
+                    spin_reso_width_->Update();
                 }
             }
         }
 
         virtual void EvalBedSpin( wxCommandEvent& event ) override {
             if(bedsize_lock_btn_->GetValue()) {
-
                 if(event.GetId() == bed_width_spin_->GetId()) {
                     bed_height_spin_->SetValue(
                             std::round(bed_width_spin_->GetValue()/bs_ratio_));
+                    bed_height_spin_->Update();
                 } else {
                     bed_width_spin_->SetValue(
                             std::round(bed_height_spin_->GetValue()*bs_ratio_));
+                    bed_width_spin_->Update();
                 }
             }
         }

xs/src/slic3r/GUI/PngExportDialog.cpp

@@ -73,7 +73,7 @@ PngExportDialog::PngExportDialog( wxWindow* parent, wxWindowID id, const wxStrin
 
     reso_lock_btn_ = new wxToggleButton( this, wxID_ANY, _("Lock"), wxDefaultPosition, wxDefaultSize, 0 );
     reso_lock_btn_->SetValue(true);
-    resolution_spins_layout_->Add( reso_lock_btn_, 0, wxALL, 5 );
+    resolution_spins_layout_->Add( reso_lock_btn_, 0, wxALIGN_CENTER|wxALL, 5 );
 
 
     resolution_layout_->Add( resolution_spins_layout_, 1, wxEXPAND, 5 );
@@ -95,7 +95,7 @@ PngExportDialog::PngExportDialog( wxWindow* parent, wxWindowID id, const wxStrin
 
     bedsize_lock_btn_ = new wxToggleButton( this, wxID_ANY, _("Lock"), wxDefaultPosition, wxDefaultSize, 0 );
     bedsize_lock_btn_->SetValue(true);
-    bedsize_spins_layout_->Add( bedsize_lock_btn_, 0, wxALL, 5 );
+    bedsize_spins_layout_->Add( bedsize_lock_btn_, 0, wxALIGN_CENTER|wxALL, 5 );
 
 
     bedsize_layout_->Add( bedsize_spins_layout_, 1, wxEXPAND, 5 );