Train Length - correct lengths + UI zoom support

train_length_2.patch

diff --git a/src/depot_gui.cpp b/src/depot_gui.cpp
index 47eefc65e..4e655dd27 100644
--- a/src/depot_gui.cpp
+++ b/src/depot_gui.cpp
@@ -297,9 +297,9 @@ struct DepotWindow : Window {
 						this->sel, EIT_IN_DEPOT, free_wagon ? 0 : this->hscroll->GetPosition(), this->vehicle_over);
 
 				/* Length of consist in tiles with 1 fractional digit (rounded up) */
-				SetDParam(0, CeilDiv(u->gcache.cached_total_length * 10, TILE_SIZE));
-				SetDParam(1, 1);
-				DrawString(rtl ? left + WD_FRAMERECT_LEFT : right - this->count_width, rtl ? left + this->count_width : right - WD_FRAMERECT_RIGHT, y + (this->resize.step_height - FONT_HEIGHT_SMALL) / 2, STR_TINY_BLACK_DECIMAL, TC_FROMSTRING, SA_RIGHT); // Draw the counter
+				//SetDParam(0, CeilDiv(u->gcache.cached_total_length * 10, TILE_SIZE));
+				//SetDParam(1, 1);
+				//DrawString(rtl ? left + WD_FRAMERECT_LEFT : right - this->count_width, rtl ? left + this->count_width : right - WD_FRAMERECT_RIGHT, y + (this->resize.step_height - FONT_HEIGHT_SMALL) / 2, STR_TINY_BLACK_DECIMAL, TC_FROMSTRING, SA_RIGHT); // Draw the counter
 				break;
 			}
 
@@ -332,6 +332,23 @@ struct DepotWindow : Window {
 		}
 	}
 
+	void DrawTrainLengthCounter(const Rect &r) const
+	{
+		if (this->type != VEH_TRAIN) return;
+
+		bool rtl = _current_text_dir == TD_RTL;
+		int column = 0;
+
+        /* show train length grid (1 tile = 16/8 of vehicles) */
+		for (int w = r.left + this->header_width - this->hscroll->GetPosition(); w <= r.right + this->hscroll->GetPosition(); w += ScaleGUITrad(TILE_SIZE) * 4) {
+			GfxDrawLine(w, r.top, w, r.bottom, 7, 1, 1);
+
+			SetDParam(0, column++);
+
+			DrawString(rtl ? left + WD_FRAMERECT_LEFT : w - this->count_width, rtl ? w + this->count_width : w - WD_FRAMERECT_RIGHT, r.bottom - (this->resize.step_height - FONT_HEIGHT_SMALL) / 2, STR_TINY_GRAY, TC_FROMSTRING, SA_RIGHT); // Draw the tile counter
+		}
+	}
+
 	void DrawWidget(const Rect &r, int widget) const
 	{
 		if (widget != WID_D_MATRIX) return;
@@ -342,6 +359,8 @@ struct DepotWindow : Window {
 		const NWidgetCore *wid = this->GetWidget<NWidgetCore>(WID_D_MATRIX);
 		uint16 rows_in_display = wid->current_y / wid->resize_y;
 
+		this->DrawTrainLengthCounter(r);
+
 		uint16 num = this->vscroll->GetPosition() * this->num_columns;
 		int maxval = min(this->vehicle_list.Length(), num + (rows_in_display * this->num_columns));
 		int y;
diff --git a/src/lang/english.txt b/src/lang/english.txt
index 198f38c4c..88901fbdf 100644
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -5002,6 +5002,7 @@ STR_ORANGE_STRING1_LTBLUE                                       :{ORANGE}{STRING
 STR_TINY_BLACK_HEIGHT                                           :{TINY_FONT}{BLACK}{HEIGHT}
 STR_TINY_BLACK_VEHICLE                                          :{TINY_FONT}{BLACK}{VEHICLE}
 STR_TINY_RIGHT_ARROW                                            :{TINY_FONT}{RIGHT_ARROW}
+STR_TINY_GRAY                                                   :{TINY_FONT}{GRAY}{NUM}
 
 STR_BLACK_1                                                     :{BLACK}1
 STR_BLACK_2                                                     :{BLACK}2