From 4d09b4cff522c920f6a6d8d095b0c44c58a806fb Mon Sep 17 00:00:00 2001
From: Jaex <Jaex@users.noreply.github.com>
Date: Fri, 4 Dec 2015 16:12:30 +0200
Subject: [PATCH] Added shadow to region (annotate) rectangle drawing

---
 .../Extensions/GraphicsExtensions.cs            | 17 +++++++++++++++++
 .../Forms/RectangleAnnotate.cs                  | 17 +++++++++++------
 .../RectangleAnnotateOptions.cs                 |  7 +++++--
 3 files changed, 33 insertions(+), 8 deletions(-)

diff --git a/ShareX.HelpersLib/Extensions/GraphicsExtensions.cs b/ShareX.HelpersLib/Extensions/GraphicsExtensions.cs
index 85b4e5dc4..cdca73f17 100644
--- a/ShareX.HelpersLib/Extensions/GraphicsExtensions.cs
+++ b/ShareX.HelpersLib/Extensions/GraphicsExtensions.cs
@@ -25,6 +25,7 @@
 
 using System.Drawing;
 using System.Drawing.Drawing2D;
+using System.Windows.Forms;
 
 namespace ShareX.HelpersLib
 {
@@ -48,6 +49,22 @@ public static void DrawRectangleProper(this Graphics g, Pen pen, int x, int y, i
             DrawRectangleProper(g, pen, new Rectangle(x, y, width, height));
         }
 
+        public static void DrawRectangleShadow(this Graphics g, Rectangle rect, Color shadowColor, int shadowDepth, int shadowMaxAlpha, int shadowMinAlpha, Padding shadowDirection)
+        {
+            for (int i = 0; i < shadowDepth; i++)
+            {
+                int currentAlpha = (int)MathHelpers.Lerp(shadowMaxAlpha, shadowMinAlpha, (float)i / (shadowDepth - 1));
+
+                using (Pen pen = new Pen(Color.FromArgb(currentAlpha, shadowColor)))
+                {
+                    Rectangle shadowRect = new Rectangle(rect.X + -shadowDirection.Left * i, rect.Y + -shadowDirection.Top * i,
+                        rect.Width + (shadowDirection.Left + shadowDirection.Right) * i, rect.Height + (shadowDirection.Top + shadowDirection.Bottom) * i);
+
+                    g.DrawRectangleProper(pen, shadowRect);
+                }
+            }
+        }
+
         public static void DrawRoundedRectangle(this Graphics g, Brush brush, Pen pen, Rectangle rect, float radius)
         {
             using (GraphicsPath gp = new GraphicsPath())
diff --git a/ShareX.ScreenCaptureLib/Forms/RectangleAnnotate.cs b/ShareX.ScreenCaptureLib/Forms/RectangleAnnotate.cs
index f9f21da0d..b5891f223 100644
--- a/ShareX.ScreenCaptureLib/Forms/RectangleAnnotate.cs
+++ b/ShareX.ScreenCaptureLib/Forms/RectangleAnnotate.cs
@@ -349,15 +349,13 @@ protected override void OnPaint(PaintEventArgs e)
 
             Graphics g = e.Graphics;
             g.InterpolationMode = InterpolationMode.NearestNeighbor;
-            g.SmoothingMode = SmoothingMode.HighQuality;
+            g.SmoothingMode = SmoothingMode.HighSpeed;
             g.CompositingMode = CompositingMode.SourceCopy;
             g.DrawImage(backgroundImage, ScreenRectangle0Based);
             g.CompositingMode = CompositingMode.SourceOver;
 
             if (Mode == RegionAnnotateMode.Rectangle)
             {
-                g.SmoothingMode = SmoothingMode.HighSpeed;
-
                 if (isMouseDown)
                 {
                     DrawRectangle(g);
@@ -366,12 +364,12 @@ protected override void OnPaint(PaintEventArgs e)
                 {
                     DrawRectangleMarker(g);
                 }
-
-                g.SmoothingMode = SmoothingMode.HighQuality;
             }
             else if (Mode == RegionAnnotateMode.Pen)
             {
+                g.SmoothingMode = SmoothingMode.HighQuality;
                 DrawDot(g);
+                g.SmoothingMode = SmoothingMode.HighSpeed;
             }
 
             if (Options.ShowTips)
@@ -491,9 +489,16 @@ private void DrawLine(Graphics g)
 
         private void DrawRectangle(Graphics g)
         {
+            Rectangle rect = SelectionRectangle0Based.Offset(Options.DrawingRectangleBorderSize - 1);
+
+            if (Options.DrawingRectangleShadow)
+            {
+                g.DrawRectangleShadow(rect.Offset(1), Color.DarkGray, 3, 128, 20, new Padding(1));
+            }
+
             using (Pen pen = new Pen(Options.DrawingPenColor, Options.DrawingRectangleBorderSize) { Alignment = PenAlignment.Inset })
             {
-                g.DrawRectangleProper(pen, SelectionRectangle0Based.Offset(Options.DrawingRectangleBorderSize - 1));
+                g.DrawRectangleProper(pen, rect);
             }
         }
 
diff --git a/ShareX.ScreenCaptureLib/RectangleAnnotateOptions.cs b/ShareX.ScreenCaptureLib/RectangleAnnotateOptions.cs
index fb112cf52..8e676ca02 100644
--- a/ShareX.ScreenCaptureLib/RectangleAnnotateOptions.cs
+++ b/ShareX.ScreenCaptureLib/RectangleAnnotateOptions.cs
@@ -37,12 +37,12 @@ public class RectangleAnnotateOptions
         [DefaultValue(true), Description("Show hotkey tips.")]
         public bool ShowTips { get; set; }
 
-        [DefaultValue(typeof(Color), "0, 230, 0"), Description("Color of pen and rectangle border.")]
+        [DefaultValue(typeof(Color), "255, 0, 0"), Description("Color of pen and rectangle border.")]
         public Color DrawingPenColor { get; set; }
 
         private int drawingPenSize;
 
-        [DefaultValue(7), Description("Size of pen.")]
+        [DefaultValue(5), Description("Size of pen.")]
         public int DrawingPenSize
         {
             get
@@ -70,6 +70,9 @@ public int DrawingRectangleBorderSize
             }
         }
 
+        [DefaultValue(true), Description("Draw shadow around rectangle.")]
+        public bool DrawingRectangleShadow { get; set; }
+
         public RectangleAnnotateOptions()
         {
             this.ApplyDefaultPropertyValues();