Merge pull request #64 from Pioziomgames/master

Add controls to the bitmap viewer

GFDStudio/GUI/Controls/BitmapViewControl.cs

@@ -1,24 +1,73 @@
 using System.Drawing;
+using System.Drawing.Drawing2D;
+using System.Numerics;
 using System.Windows.Forms;
 
 namespace GFDStudio.GUI.Controls
 {
     public partial class BitmapViewControl : UserControl
     {
         private static BitmapViewControl sInstance;
-
+        private Bitmap Image;
+        private Point LastMouseLocation;
         public static BitmapViewControl Instance => sInstance ?? ( sInstance = new BitmapViewControl() );
-
+        public float TextureScale = 1;
+        public Vector2 TextureOffset = Vector2.Zero;
+        public bool Nearest = false;
         private BitmapViewControl()
         {
             InitializeComponent();
+            this.SetStyle( ControlStyles.UserPaint |
+                ControlStyles.AllPaintingInWmPaint |
+                ControlStyles.OptimizedDoubleBuffer, true );
         }
 
         public void LoadBitmap( Bitmap bitmap )
         {
-            BackgroundImage = bitmap;
-            Width           = bitmap.Width;
-            Height          = bitmap.Height;
+            Image = bitmap;
+        }
+        protected override void OnPaint( PaintEventArgs e )
+        {
+            if ( Image != null )
+            {
+                e.Graphics.InterpolationMode = Nearest ? InterpolationMode.NearestNeighbor : InterpolationMode.Default;
+                e.Graphics.DrawImage( Image, TextureOffset.X + this.Width / 2 - Image.Width * TextureScale / 2,
+                    TextureOffset.Y + this.Height / 2 - Image.Height * TextureScale / 2,
+                    Image.Width * TextureScale, Image.Height * TextureScale );
+            }
+        }
+        protected override void OnMouseMove( MouseEventArgs e )
+        {
+            if ( e.Button == MouseButtons.Left || e.Button == MouseButtons.Right )
+            {
+                TextureOffset.X += e.Location.X - LastMouseLocation.X;
+                TextureOffset.Y += e.Location.Y - LastMouseLocation.Y;
+                Invalidate();
+            }
+
+            LastMouseLocation = e.Location;
+        }
+        protected override void OnMouseWheel( MouseEventArgs e )
+        {
+            TextureScale += TextureScale * ( e.Delta * 0.001f );
+            TextureOffset.X += TextureOffset.X * ( e.Delta * 0.001f );
+            TextureOffset.Y += TextureOffset.Y * ( e.Delta * 0.001f );
+            Invalidate();
+        }
+        protected override void OnKeyDown( KeyEventArgs e )
+        {
+            if ( e.KeyCode == Keys.Space )
+            {
+                TextureOffset.X = 0;
+                TextureOffset.Y = 0;
+                TextureScale = 1;
+                Invalidate();
+            }
+            else if ( e.KeyCode == Keys.F )
+            {
+                Nearest = !Nearest;
+                Invalidate();
+            }
         }
     }
 }