check point

framework/MaterialSkin.Core/DrawHelper.cs

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+using System.Drawing;
+using System.Drawing.Drawing2D;
+
+namespace MaterialSkin
+{
+    static class DrawHelper
+    {
+        public static GraphicsPath CreateRoundRect(float x, float y, float width, float height, float radius)
+        {
+            var gp = new GraphicsPath();
+            gp.AddLine(x + radius, y, x + width - (radius * 2), y);
+            gp.AddArc(x + width - (radius * 2), y, radius * 2, radius * 2, 270, 90);
+            gp.AddLine(x + width, y + radius, x + width, y + height - (radius * 2));
+            gp.AddArc(x + width - (radius * 2), y + height - (radius * 2), radius * 2, radius * 2, 0, 90);
+            gp.AddLine(x + width - (radius * 2), y + height, x + radius, y + height);
+            gp.AddArc(x, y + height - (radius * 2), radius * 2, radius * 2, 90, 90);
+            gp.AddLine(x, y + height - (radius * 2), x, y + radius);
+            gp.AddArc(x, y, radius * 2, radius * 2, 180, 90);
+            gp.CloseFigure();
+            return gp;
+        }
+
+        public static GraphicsPath CreateRoundRect(Rectangle rect, float radius)
+        {
+            return CreateRoundRect(rect.X, rect.Y, rect.Width, rect.Height, radius);
+        }
+
+        public static Color BlendColor(Color backgroundColor, Color frontColor, double blend)
+        {
+            var ratio = blend / 255d;
+            var invRatio = 1d - ratio;
+            var r = (int)((backgroundColor.R * invRatio) + (frontColor.R * ratio));
+            var g = (int)((backgroundColor.G * invRatio) + (frontColor.G * ratio));
+            var b = (int)((backgroundColor.B * invRatio) + (frontColor.B * ratio));
+            return Color.FromArgb(r, g, b);
+        }
+
+        public static Color BlendColor(Color backgroundColor, Color frontColor)
+        {
+            return BlendColor(backgroundColor, frontColor, frontColor.A);
+        }
+    }
+}