OK In progress...

src/Area.vala

@@ -110,8 +110,7 @@ namespace CairoChart {
 				return zx1 - zx0;
 			}
 			set {
-				if (zx0 <= zx0 + value <= _x1)
+				zx1 = zx0 + value;
-					zx1 = zx0 + value;
 			}
 		}
 
@@ -123,8 +122,7 @@ namespace CairoChart {
 				return zy1 - zy0;
 			}
 			set {
-				if (zy0 <= zy0 + value <= _y1)
+				zy1 = zy0 + value;
-					zy1 = zy0 + value;
 			}
 		}
 
@@ -133,6 +131,17 @@ namespace CairoChart {
 		 */
 		public Area () { }
 
+		/**
+		 * Constructs a new ``Area`` by other ``Area``.
+		 * @param area ``Area`` instance.
+		 */
+		public Area.with_area (Area area) {
+			this.x0 = area.x0;
+			this.y0 = area.y0;
+			this.x1 = area.x1;
+			this.y1 = area.y1;
+		}
+
 		/**
 		 * Constructs a new ``Area`` with absolute coordinates.
 		 * @param x0 left bound.
@@ -161,17 +170,6 @@ namespace CairoChart {
 			this.height = height;
 		}
 
-		/**
-		 * Constructs a new ``Area`` by other ``Area``.
-		 * @param area ``Area`` instance.
-		 */
-		public Area.with_area (Area area) {
-			this.x0 = area.x0;
-			this.y0 = area.y0;
-			this.x1 = area.x1;
-			this.y1 = area.y1;
-		}
-
 		/**
 		 * Constructs a new ``Area`` by ``Cairo.Rectangle``.
 		 * @param rectangle ``Cairo.Rectangle`` instance.

src/Range.vala

@@ -7,8 +7,16 @@ namespace CairoChart {
 
 		double _low = 0;
 		double _high = 1;
-		double _zlow = 0;
+
-		double _zhigh = 1;
+		/**
+		 * Zoomed low bound.
+		 */
+		double zlow = 0;
+
+		/**
+		 * Zoomed high bound.
+		 */
+		double zhigh = 1;
 
 		/**
 		 * Low bound.
@@ -18,7 +26,7 @@ namespace CairoChart {
 				return _low;
 			}
 			set {
-				_zlow = _low = value;
+				zlow = _low = value;
 			}
 		}
 
@@ -30,33 +38,7 @@ namespace CairoChart {
 				return _high;
 			}
 			set {
-				_zhigh = _high = value;
+				zhigh = _high = value;
-			}
-		}
-
-		/**
-		 * Zoomed low bound.
-		 */
-		double zlow {
-			get {
-				return _zlow;
-			}
-			set {
-				if (_low <= value <= _high)
-					_zlow = value;
-			}
-		}
-
-		/**
-		 * Zoomed high bound.
-		 */
-		double zhigh {
-			get {
-				return _zhigh;
-			}
-			set {
-				if (_low <= value <= _high)
-					_zhigh = value;
 			}
 		}
 
@@ -68,7 +50,7 @@ namespace CairoChart {
 				return _high - _low;
 			}
 			set {
-				_zhigh = _high = _low + value;
+				zhigh = _high = _low + value;
 			}
 		}
 
@@ -77,11 +59,10 @@ namespace CairoChart {
 		 */
 		public double zrange {
 			get {
-				return _zhigh - _zlow;
+				return zhigh - zlow;
 			}
 			set {
-				if (_zlow <= _zlow + value <= _high)
+				zhigh = zlow + value;
-					_zhigh = _zlow + value;
 			}
 		}
 
@@ -125,8 +106,8 @@ namespace CairoChart {
 		 * Unzooms ``Range``.
 		 */
 		public void unzoom () {
-			_zlow = low;
+			zlow = low;
-			_zhigh = high;
+			zhigh = high;
 		}
 	}
 }