- Fix for #6072 - Two issues:

- SvgGradientStop offset values were not being confined to percentages (0.0-1.0 or %) so a ToPercentage() method has been added to SvgUnit which converts to a percentage unit. This method is called during the Offset property setter.
- SvgLinearGradientServer was incorrectly calculating the end point of the gradient.

DataTypes/SvgUnit.cs

@@ -111,6 +111,22 @@ namespace Svg
             return this._deviceValue.Value;
         }
 
+        public SvgUnit ToPercentage()
+        {
+            switch (this.Type)
+            {
+                case SvgUnitType.Percentage:
+                    return this;
+                case SvgUnitType.User:
+                    return new SvgUnit(SvgUnitType.Percentage, this.Value * 100);
+                default:
+                    throw new NotImplementedException();
+                    break;
+            }
+
+            return this;
+        }
+
         public override bool Equals(object obj)
         {
             if (obj == null)

Painting/SvgGradientStop.cs

@@ -16,7 +16,10 @@ namespace Svg
         public SvgUnit Offset
         {
             get { return this._offset; }
-            set { this._offset = value; }
+            set
+            {
+                this._offset = value.ToPercentage();
+            }
         }
 
         [SvgAttribute("stop-color")]

Painting/SvgLinearGradientServer.cs

@@ -106,7 +106,7 @@ namespace Svg
                 }
 
                 float x = (this.End.X.IsEmpty) ? start.X : this.End.X.ToDeviceValue(owner);
-                end = new PointF(x, (start.Y + this.End.Y.ToDeviceValue(owner, true)));
+                end = new PointF(x, this.End.Y.ToDeviceValue(owner, true));
             }
             else
             {