From 1f5e6ccb672f9dcfc7b4f5a79d80a488b547685c Mon Sep 17 00:00:00 2001
From: Joseph Lenox <lenox.joseph@gmail.com>
Date: Mon, 30 Apr 2018 22:20:00 -0500
Subject: [PATCH] more work on repaint() event handler. Now draws grid based on
 bed polygon in config.

---
 src/GUI/Plater/Plate2D.cpp | 36 +++++++++++++++++++++++++++++++++---
 src/GUI/Plater/Plate2D.hpp |  3 +++
 2 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/src/GUI/Plater/Plate2D.cpp b/src/GUI/Plater/Plate2D.cpp
index b30f3b9e7..72d14e414 100644
--- a/src/GUI/Plater/Plate2D.cpp
+++ b/src/GUI/Plater/Plate2D.cpp
@@ -35,7 +35,7 @@ void Plate2D::repaint(wxPaintEvent& e) {
     this->SetFocus();
 
     auto dc {new wxAutoBufferedPaintDC(this)};
-    const auto& size = this->GetSize();
+    const auto& size {wxSize(this->GetSize().GetWidth(), this->GetSize().GetHeight())};
 
 
     if (this->user_drawn_background) {
@@ -55,8 +55,38 @@ void Plate2D::repaint(wxPaintEvent& e) {
     {
         dc->SetPen(this->print_center_pen);
         dc->SetBrush(this->bed_brush);
-        
-        dc->DrawPolygon(scaled_points_to_pixel(this->bed_polygon, true), 0, 0);
+        auto tmp {scaled_points_to_pixel(this->bed_polygon, true)};
+        dc->DrawPolygon(this->bed_polygon.points.size(), tmp.data(), 0, 0);
+    }
+
+    // draw print center
+    {
+        if (this->objects.size() > 0 && settings->autocenter) {
+            const auto center = this->unscaled_point_to_pixel(this->print_center);
+            dc->SetPen(print_center_pen);
+            dc->DrawLine(center.x, 0, center.x, size.y);
+            dc->DrawLine(0, center.y, size.x, center.y);
+            dc->SetTextForeground(wxColor(0,0,0));
+            dc->SetFont(wxFont(10, wxFONTFAMILY_ROMAN, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL));
+
+            dc->DrawLabel("X = ", wxRect(0,0, center.x*2, this->GetSize().GetHeight()), wxALIGN_CENTER_HORIZONTAL | wxALIGN_BOTTOM);
+            dc->DrawRotatedText("Y = ", 0, center.y + 15, 90);
+        }
+    }
+
+    // draw text if plate is empty
+    if (this->objects.size() == 0) {
+        dc->SetTextForeground(settings->color->BED_OBJECTS());
+        dc->SetFont(wxFont(14, wxFONTFAMILY_ROMAN, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL));
+        dc->DrawLabel(CANVAS_TEXT, wxRect(0,0, this->GetSize().GetWidth(), this->GetSize().GetHeight()), wxALIGN_CENTER_HORIZONTAL | wxALIGN_CENTER_VERTICAL);
+    } else { 
+        // draw grid
+        dc->SetPen(grid_pen);
+        // Assumption: grid of lines is arranged
+        // as adjacent pairs of wxPoints
+        for (auto i = 0U; i < grid.size(); i+=2) {
+            dc->DrawLine(grid[i], grid[i+1]);
+        }
     }
 
 
diff --git a/src/GUI/Plater/Plate2D.hpp b/src/GUI/Plater/Plate2D.hpp
index 8c5313791..39457bc71 100644
--- a/src/GUI/Plater/Plate2D.hpp
+++ b/src/GUI/Plater/Plate2D.hpp
@@ -90,7 +90,10 @@ private:
     const std::string LogChannel {"GUI_2D"};
 
     wxPoint bed_origin {};
+    wxPoint print_center {};
     Slic3r::Polygon bed_polygon {};
+    std::vector<wxPoint> grid {};
+
     /// Set up the 2D canvas blank canvas text. 
     /// Easter egg: Sept. 13, 2006. The first part ever printed by a RepRap to make another RepRap.
     const wxString CANVAS_TEXT { today_is_special ? _(L"What do you want to print today?™") : _("Drag your objects here") };