Repair calculating a percentage value (#410)

* Repair calculate a percentage value
* Add percentage size tests

Source/Basic Shapes/SvgEllipse.cs

@@ -93,11 +93,12 @@ namespace Svg
 							}
 
                 var center = SvgUnit.GetDevicePoint(this._centerX, this._centerY, renderer, this);
-								var radius = SvgUnit.GetDevicePoint(this._radiusX + halfStrokeWidth, this._radiusY + halfStrokeWidth, renderer, this);
+				var radiusX = this.RadiusX.ToDeviceValue(renderer, UnitRenderingType.Other, this) + halfStrokeWidth;
+                var radiusY = this.RadiusY.ToDeviceValue(renderer, UnitRenderingType.Other, this) + halfStrokeWidth;
 
                 this._path = new GraphicsPath();
                 _path.StartFigure();
-                _path.AddEllipse(center.X - radius.X, center.Y - radius.Y, 2 * radius.X, 2 * radius.Y);
+                _path.AddEllipse(center.X - radiusX, center.Y - radiusY, 2 * radiusX, 2 * radiusY);
                 _path.CloseFigure();
             }
             return _path;

Tests/Svg.UnitTests/PercentageSizeTests.cs

+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Svg.UnitTests
+{
+    [TestClass]
+    public class PercentageSizeTests
+    {
+        [TestMethod]
+        public void TestRectangle()
+        {
+            var svgRectangle = new SvgRectangle()
+            {
+                X = new SvgUnit(SvgUnitType.Percentage, 50),
+                Y = new SvgUnit(SvgUnitType.Percentage, 50),
+                Width = new SvgUnit(SvgUnitType.Percentage, 15),
+                Height = new SvgUnit(SvgUnitType.Percentage, 20)
+            };
+            CheckPercentageSize(svgRectangle);
+        }
+
+        [TestMethod]
+        public void TestCircle()
+        {
+            var svgCircle = new SvgCircle()
+            {
+                CenterX = new SvgUnit(SvgUnitType.Percentage, 50),
+                CenterY = new SvgUnit(SvgUnitType.Percentage, 50),
+                Radius = new SvgUnit(SvgUnitType.Percentage, 15),
+            };
+            CheckPercentageSize(svgCircle);
+        }
+
+        [TestMethod]
+        public void TestEllipse()
+        {
+            var svgEllipse = new SvgEllipse()
+            {
+                CenterX = new SvgUnit(SvgUnitType.Percentage, 50),
+                CenterY = new SvgUnit(SvgUnitType.Percentage, 50),
+                RadiusX = new SvgUnit(SvgUnitType.Percentage, 15),
+                RadiusY = new SvgUnit(SvgUnitType.Percentage, 5),
+            };
+            CheckPercentageSize(svgEllipse);
+        }
+
+        private void CheckPercentageSize(SvgVisualElement element)
+        {
+            var svgDoc = new SvgDocument()
+            {
+                Width = 200,
+                Height = 200
+            };
+            svgDoc.Children.Add(element);
+            var boudsPref = element.Bounds;
+            svgDoc.Width = 400;
+            svgDoc.Height = 400;
+            var boundsAfter = element.Bounds;
+            Assert.AreNotEqual(boudsPref.Size, boundsAfter.Size, "To device value convert error");
+        }
+    }
+}

Tests/Svg.UnitTests/Svg.UnitTests.csproj

@@ -69,6 +69,7 @@
     <Compile Include="SvgTextTests.cs" />
     <Compile Include="SvgTextElementDeepCopyTest.cs" />
     <Compile Include="ImageComparisonTest.cs" />
+    <Compile Include="PercentageSizeTests.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\Source\Svg.csproj">