From 91418e9c6670349846d9fa95bf6407aafc7e4e5a Mon Sep 17 00:00:00 2001
From: Kurt <kaphotics@gmail.com>
Date: Thu, 9 Apr 2020 12:52:07 -0700
Subject: [PATCH] Enhance extension item visualization

Mark class as static

Draws directional lines trying to point back to the root item
---
 NHSE.Sprites/Field/FieldItemSpriteDrawer.cs | 45 ++++++++++++++++-----
 NHSE.Sprites/Util/SpriteUtil.cs             |  3 +-
 NHSE.WinForms/Subforms/FieldItemEditor.cs   |  6 +--
 3 files changed, 40 insertions(+), 14 deletions(-)

diff --git a/NHSE.Sprites/Field/FieldItemSpriteDrawer.cs b/NHSE.Sprites/Field/FieldItemSpriteDrawer.cs
index 079bda7..ab93568 100644
--- a/NHSE.Sprites/Field/FieldItemSpriteDrawer.cs
+++ b/NHSE.Sprites/Field/FieldItemSpriteDrawer.cs
@@ -3,14 +3,9 @@
 
 namespace NHSE.Sprites
 {
-    public class FieldItemSpriteDrawer
+    public static class FieldItemSpriteDrawer
     {
-        public int Width { get; set; } = 8;
-        public int Height { get; set; } = 8;
-
-        public Bitmap GetImage(FieldItem item) => FieldItemSprite.GetImage(item, Width, Height);
-
-        public Bitmap GetBitmapLayer(FieldItemLayer layer)
+        public static Bitmap GetBitmapLayer(FieldItemLayer layer)
         {
             var items = layer.Tiles;
             var height = layer.MapHeight;
@@ -53,12 +48,13 @@ private static int[] GetBitmapLayerAcre(FieldItemLayer layer, int x0, int y0, ou
             return bmpData;
         }
 
-        public Bitmap GetBitmapLayerAcre(FieldItemLayer layer, int x0, int y0, int scale)
+        public static Bitmap GetBitmapLayerAcre(FieldItemLayer layer, int x0, int y0, int scale)
         {
             var map = GetBitmapLayerAcre(layer, x0, y0, out int mh, out int mw);
             var data = ImageUtil.ScalePixelImage(map, scale, mw, mh, out var w, out var h);
 
             // draw symbols over special items now?
+            DrawDirectionals(data, layer, w, x0, y0, scale);
 
             // Slap on a grid
             DrawGrid(data, w, h, scale);
@@ -67,6 +63,37 @@ public Bitmap GetBitmapLayerAcre(FieldItemLayer layer, int x0, int y0, int scale
             return ImageUtil.GetBitmap(data, w, h);
         }
 
+        private static void DrawDirectionals(int[] data, FieldItemLayer layer, int w, int x0, int y0, int scale)
+        {
+            for (int x = x0; x < x0 + layer.GridWidth; x++)
+            {
+                for (int y = y0; y < y0 + layer.GridHeight; y++)
+                {
+                    var tile = layer.GetTile(x, y);
+                    if (!tile.IsExtension)
+                        continue;
+                    DrawDirectional(data, tile, (x - x0) * scale, (y - y0) * scale, scale, w);
+                }
+            }
+        }
+
+        private static void DrawDirectional(int[] data, FieldItem tile, int x0, int y0, int scale, int w)
+        {
+            var eX = tile.ExtensionX;
+            var eY = tile.ExtensionY;
+            var sum = eX + eY;
+            var start = scale / (sum + 1);
+            var startX = eX >= eY ? 0 : start;
+            var startY = eX <= eY ? 0 : start;
+
+            var baseIndex = (w * y0) + x0;
+            for (int x = startX, y = startY; x < scale && y < scale; x += eX, y += eY)
+            {
+                var index = baseIndex + (w * y) + x;
+                data[index] ^= 0x808080;
+            }
+        }
+
         private static void DrawGrid(int[] data, int w, int h, int scale)
         {
             const int grid = -0x777778; // 0xFF888888u
@@ -92,7 +119,7 @@ private static void DrawGrid(int[] data, int w, int h, int scale)
             }
         }
 
-        public Bitmap GetBitmapLayer(FieldItemLayer layer, int x, int y, int scale = 1)
+        public static Bitmap GetBitmapLayer(FieldItemLayer layer, int x, int y, int scale = 1)
         {
             var map = GetBitmapLayer(layer);
             if (scale > 1)
diff --git a/NHSE.Sprites/Util/SpriteUtil.cs b/NHSE.Sprites/Util/SpriteUtil.cs
index 4ecd57e..7798d05 100644
--- a/NHSE.Sprites/Util/SpriteUtil.cs
+++ b/NHSE.Sprites/Util/SpriteUtil.cs
@@ -3,6 +3,5 @@
     public static class SpriteUtil
     {
         public static readonly ItemSpriteDrawer Items = new ItemSpriteDrawer();
-        public static readonly FieldItemSpriteDrawer FieldItems = new FieldItemSpriteDrawer();
     }
-}
\ No newline at end of file
+}
diff --git a/NHSE.WinForms/Subforms/FieldItemEditor.cs b/NHSE.WinForms/Subforms/FieldItemEditor.cs
index 060f154..4bc10e9 100644
--- a/NHSE.WinForms/Subforms/FieldItemEditor.cs
+++ b/NHSE.WinForms/Subforms/FieldItemEditor.cs
@@ -47,7 +47,7 @@ private void ChangeViewToAcre(int acre)
 
         private void ReloadMap()
         {
-            PB_Map.Image = SpriteUtil.FieldItems.GetBitmapLayer(Layer, X, Y);
+            PB_Map.Image = FieldItemSpriteDrawer.GetBitmapLayer(Layer, X, Y);
         }
 
         private void LoadGrid(int topX, int topY)
@@ -59,7 +59,7 @@ private void LoadGrid(int topX, int topY)
 
         private void ReloadGrid(FieldItemLayer layer, int topX, int topY)
         {
-            PB_Acre.Image = SpriteUtil.FieldItems.GetBitmapLayerAcre(layer, topX, topY, AcreScale);
+            PB_Acre.Image = FieldItemSpriteDrawer.GetBitmapLayerAcre(layer, topX, topY, AcreScale);
         }
 
         private void UpdateArrowVisibility()
@@ -301,7 +301,7 @@ private void Menu_SavePNG_Click(object sender, EventArgs e)
             }
 
             const string name = "map";
-            var bmp = SpriteUtil.FieldItems.GetBitmapLayer(Items.Layer1);
+            var bmp = FieldItemSpriteDrawer.GetBitmapLayer(Items.Layer1);
             using var sfd = new SaveFileDialog
             {
                 Filter = "png file (*.png)|*.png|All files (*.*)|*.*",