OK In progress...

src/Axis.vala

@@ -60,7 +60,7 @@ namespace CairoChart {
 			}
 			default = 2;
 		}
-		public Font font_style = Font ();
+		public Font font_style = new Font ();
 		public Color color = Color ();
 		public LineStyle line_style = LineStyle ();
 		public double font_spacing = 5;
@@ -108,9 +108,8 @@ namespace CairoChart {
 				switch (type) {
 				case Axis.Type.NUMBERS:
 					var text = new Text (chart, format.printf((LongDouble)x) + (horizontal ? "_" : ""), font_style);
-					var sz = text.size;
+					max_rec_width = double.max (max_rec_width, text.width);
-					max_rec_width = double.max (max_rec_width, sz.width);
+					max_rec_height = double.max (max_rec_height, text.height);
-					max_rec_height = double.max (max_rec_height, sz.height);
 					break;
 				case Axis.Type.DATE_TIME:
 					string date, time;
@@ -119,15 +118,13 @@ namespace CairoChart {
 					var h = 0.0;
 					if (date_format != "") {
 						var text = new Text (chart, date + (horizontal ? "_" : ""), font_style);
-						var sz = text.size;
+						max_rec_width = double.max (max_rec_width, text.width);
-						max_rec_width = double.max (max_rec_width, sz.width);
+						h = text.height;
-						h = sz.height;
 					}
 					if (time_format != "") {
 						var text = new Text (chart, time + (horizontal ? "_" : ""), font_style);
-						var sz = text.size;
+						max_rec_width = double.max (max_rec_width, text.width);
-						max_rec_width = double.max (max_rec_width, sz.width);
+						h += text.height;
-						h += sz.height;
 					}
 					max_rec_height = double.max (max_rec_height, h);
 					break;

src/Chart.vala

@@ -303,8 +303,11 @@ namespace CairoChart {
 			if (evarea.height < 0) evarea.height = 0;
 		}
 		protected virtual void rot_axes_titles () {
-			foreach (var s in series)
+			foreach (var s in series) {
-				s.axis_y.title.style.orient = Gtk.Orientation.VERTICAL;
+				//s.axis_y.title.font = new Font();//s.axis_y.title.font.copy();
+				s.axis_y.title.font.orient = Gtk.Orientation.VERTICAL;
+				s.axis_y.title.font.size = 50;
+			}
 		}
 
 		protected virtual void eval_plarea () {
@@ -338,12 +341,11 @@ namespace CairoChart {
 			ctx.stroke ();
 		}
 		protected virtual void draw_title () {
-			var sz = title.size;
+			var title_height = title.height + title.vspacing * 2;
-			var title_height = sz.height + title.vspacing * 2;
 			evarea.y0 += title_height;
 			evarea.height -= title_height;
 			color = title.color;
-			ctx.move_to (area.width/2 - sz.width/2, sz.height + title.vspacing);
+			ctx.move_to (area.width/2 - title.width/2, title.height + title.vspacing);
 			title.show();
 		}
 		protected virtual void draw_haxes () {

src/Cursor.vala

@@ -214,10 +214,10 @@ namespace CairoChart {
 			var x_t = new Text(chart, s.axis_x.format.printf((LongDouble)p.x), s.axis_x.font_style, s.axis_x.color);
 			var y_t = new Text(chart, s.axis_y.format.printf((LongDouble)p.y), s.axis_y.font_style, s.axis_y.color);
 			double h_x = 0.0, h_y = 0.0;
-			if (show_x) { var sz = x_t.size; size.x = sz.width; h_x = sz.height; }
+			if (show_x) { size.x = x_t.width; h_x = x_t.height; }
-			if (show_date) { var sz = date_t.size; size.x = sz.width; h_x = sz.height; }
+			if (show_date) { size.x = date_t.width; h_x = date_t.height; }
-			if (show_time) { var sz = time_t.size; size.x = double.max(size.x, sz.width); h_x += sz.height; }
+			if (show_time) { size.x = double.max(size.x, time_t.width); h_x += time_t.height; }
-			if (show_y) { var sz = y_t.size; size.x += sz.width; h_y = sz.height; }
+			if (show_y) { size.x += y_t.width; h_y = y_t.height; }
 			if ((show_x || show_date || show_time) && show_y) size.x += double.max(s.axis_x.font_spacing, s.axis_y.font_spacing);
 			if (show_date && show_time) h_x += s.axis_x.font_spacing;
 			size.y = double.max (h_x, h_y);
@@ -288,7 +288,6 @@ namespace CairoChart {
 						case Axis.Type.DATE_TIME: s.axis_x.format_date_time(x, out text, out time_text); break;
 						}
 						var text_t = new Text(chart, text, s.axis_x.font_style, s.axis_x.color);
-						var sz = text_t.size;
 						var time_text_t = new Text(chart, time_text, s.axis_x.font_style, s.axis_x.color);
 						var print_y = 0.0;
 						switch (s.axis_x.position) {
@@ -302,10 +301,10 @@ namespace CairoChart {
 								          + (chart.legend.position == Legend.Position.TOP ? chart.legend.height : 0);
 								switch (s.axis_x.type) {
 								case Axis.Type.NUMBERS:
-									print_y += sz.height;
+									print_y += text_t.height;
 									break;
 								case Axis.Type.DATE_TIME:
-									print_y += (s.axis_x.date_format == "" ? 0 : sz.height)
+									print_y += (s.axis_x.date_format == "" ? 0 : text_t.height)
 									           + (s.axis_x.time_format == "" ? 0 : time_text_t.height)
 									           + (s.axis_x.date_format == "" || s.axis_x.time_format == "" ? 0 : s.axis_x.font_spacing);
 									break;
@@ -322,7 +321,7 @@ namespace CairoChart {
 						case Axis.Type.DATE_TIME:
 							if (s.axis_x.date_format != "") text_t.show();
 							print_x = s.compact_rec_x_pos (x, time_text_t);
-							chart.ctx.move_to (print_x, print_y - (s.axis_x.date_format == "" ? 0 : sz.height + s.axis_x.font_spacing));
+							chart.ctx.move_to (print_x, print_y - (s.axis_x.date_format == "" ? 0 : text_t.height + s.axis_x.font_spacing));
 							if (s.axis_x.time_format != "") time_text_t.show();
 							break;
 						}
@@ -386,9 +385,8 @@ namespace CairoChart {
 						string date = "", time = "";
 						s.axis_x.format_date_time(point.x, out date, out time);
 						var text_t = new Text(chart, time, s.axis_x.font_style);
-						var sz = text_t.size;
+						var y = svp.y + text_t.height / 2;
-						var y = svp.y + sz.height / 2;
+						if (show_date) y -= text_t.height / 2 + s.axis_x.font_spacing / 2;
-						if (show_date) y -= sz.height / 2 + s.axis_x.font_spacing / 2;
 						chart.ctx.move_to (svp.x - size.x / 2, y);
 						if (chart.joint_x) chart.color = chart.joint_color;
 						text_t.show();
@@ -399,9 +397,8 @@ namespace CairoChart {
 						string date = "", time = "";
 						s.axis_x.format_date_time(point.x, out date, out time);
 						var text_t = new Text(chart, date, s.axis_x.font_style);
-						var sz = text_t.size;
+						var y = svp.y + text_t.height / 2;
-						var y = svp.y + sz.height / 2;
+						if (show_time) y += text_t.height / 2 + s.axis_x.font_spacing / 2;
-						if (show_time) y += sz.height / 2 + s.axis_x.font_spacing / 2;
 						chart.ctx.move_to (svp.x - size.x / 2, y);
 						if (chart.joint_x) chart.color = chart.joint_color;
 						text_t.show();
@@ -410,8 +407,7 @@ namespace CairoChart {
 					if (show_y) {
 						chart.color = s.axis_y.color;
 						var text_t = new Text(chart, s.axis_y.format.printf((LongDouble)point.y), s.axis_y.font_style);
-						var sz = text_t.size;
+						chart.ctx.move_to (svp.x + size.x / 2 - text_t.width, svp.y + text_t.height / 2);
-						chart.ctx.move_to (svp.x + size.x / 2 - sz.width, svp.y + sz.height / 2);
 						if (chart.joint_y) chart.color = chart.joint_color;
 						text_t.show();
 					}

src/Font.vala

@@ -3,32 +3,33 @@ namespace CairoChart {
 	/**
 	 * ``Font`` style.
 	 */
-	public struct Font {
+	[Compact]
+	public class Font : Object {
 
 		/**
 		 * A font family name, encoded in UTF-8.
 		 */
-		string family;
+		public string family;
 
 		/**
 		 * The new font size, in user space units.
 		 */
-		double size;
+		public double size;
 
 		/**
 		 * The slant for the font.
 		 */
-		Cairo.FontSlant slant;
+		public Cairo.FontSlant slant;
 
 		/**
 		 * The weight for the font.
 		 */
-		Cairo.FontWeight weight;
+		public Cairo.FontWeight weight;
 
 		/**
 		 * Font/Text orientation.
 		 */
-		Gtk.Orientation orient;
+		public Gtk.Orientation orient;
 
 		/**
 		 * Constructs a new ``Font``.
@@ -39,10 +40,10 @@ namespace CairoChart {
 		 * @param orient font/text orientation.
 		 */
 		public Font (string family = "Sans",
-		              double size = 10,
+		             double size = 10,
-		              Cairo.FontSlant slant = Cairo.FontSlant.NORMAL,
+		             Cairo.FontSlant slant = Cairo.FontSlant.NORMAL,
-		              Cairo.FontWeight weight = Cairo.FontWeight.NORMAL,
+		             Cairo.FontWeight weight = Cairo.FontWeight.NORMAL,
-		              Gtk.Orientation orient = Gtk.Orientation.HORIZONTAL
+		             Gtk.Orientation orient = Gtk.Orientation.HORIZONTAL
 		) {
 			this.family = family;
 			this.size = size;
@@ -50,5 +51,12 @@ namespace CairoChart {
 			this.weight = weight;
 			this.orient = orient;
 		}
+
+		/**
+		 * Gets a copy of the ``Font``.
+		 */
+		public Font copy () {
+			return new Font(family, size, slant, weight, orient);
+		}
 	}
 }

src/Legend.vala

@@ -10,7 +10,7 @@ namespace CairoChart {
 		}
 
 		public Position position = Position.TOP;
-		public Font font_style = Font();
+		public Font font_style = new Font();
 		public Color bg_color = Color(1, 1, 1);
 		public LineStyle border_style = LineStyle ();
 		public double spacing = 5;
@@ -115,13 +115,11 @@ namespace CairoChart {
 
 				if (!s.zoom_show) continue;
 
-				var title_sz = s.title.size;
-
 				// carry
 				switch (position) {
 				case Position.TOP:
 				case Position.BOTTOM:
-					var ser_title_width = title_sz.width + line_length;
+					var ser_title_width = s.title.width + line_length;
 					if (leg_width_sum + (leg_width_sum == 0 ? 0 : text_hspace) + ser_title_width > chart.area.width) { // carry
 						leg_height_sum += max_font_h;
 						switch (process_type) {
@@ -150,34 +148,34 @@ namespace CairoChart {
 					s.title.show();
 
 					// series line style
-					chart.ctx.move_to (x, y - title_sz.height / 2);
+					chart.ctx.move_to (x, y - s.title.height / 2);
 					s.line_style.apply(chart);
 					chart.ctx.rel_line_to (line_length, 0);
 					chart.ctx.stroke();
-					s.marker.draw_at_pos (x + line_length / 2, y - title_sz.height / 2);
+					s.marker.draw_at_pos (x + line_length / 2, y - s.title.height / 2);
 					break;
 				}
 
 				switch (position) {
 				case Position.TOP:
 				case Position.BOTTOM:
-					var ser_title_width = title_sz.width + line_length;
+					var ser_title_width = s.title.width + line_length;
 					leg_width_sum += (leg_width_sum == 0 ? 0 : text_hspace) + ser_title_width;
-					max_font_h = double.max (max_font_h, title_sz.height) + (leg_height_sum != 0 ? text_vspace : 0);
+					max_font_h = double.max (max_font_h, s.title.height) + (leg_height_sum != 0 ? text_vspace : 0);
 				break;
 
 				case Position.LEFT:
 				case Position.RIGHT:
 					switch (process_type) {
 					case ProcessType.CALC:
-						max_font_heights += title_sz.height + (leg_height_sum != 0 ? text_vspace : 0);
+						max_font_heights += s.title.height + (leg_height_sum != 0 ? text_vspace : 0);
-						width = double.max (width, title_sz.width + line_length);
+						width = double.max (width, s.title.width + line_length);
 						break;
 					case ProcessType.DRAW:
 						heights_idx++;
 						break;
 					}
-					leg_height_sum += title_sz.height + (leg_height_sum != 0 ? text_vspace : 0);
+					leg_height_sum += s.title.height + (leg_height_sum != 0 ? text_vspace : 0);
 				break;
 				}
 			}

src/Series.vala

@@ -263,11 +263,10 @@ namespace CairoChart {
 				}
 				var scr_x = get_scr_x (x);
 				var text_t = new Text(chart, text, axis_x.font_style, axis_x.color);
-				var sz = axis_x.title.size;
 
 				switch (axis_x.position) {
 				case Axis.Position.LOW:
-					var print_y = chart.evarea.y1 - axis_x.font_spacing - (axis_x.title.text == "" ? 0 : sz.height + axis_x.font_spacing);
+					var print_y = chart.evarea.y1 - axis_x.font_spacing - (axis_x.title.text == "" ? 0 : axis_x.title.height + axis_x.font_spacing);
 					var print_x = compact_rec_x_pos (x, text_t);
 					ctx.move_to (print_x, print_y);
 					switch (axis_x.type) {
@@ -286,7 +285,7 @@ namespace CairoChart {
 					var line_style = grid.line_style;
 					if (joint_x) line_style.color = Color(0, 0, 0, 0.5);
 					line_style.apply(chart);
-					double y = chart.evarea.y1 - max_rec_height - axis_x.font_spacing - (axis_x.title.text == "" ? 0 : sz.height + axis_x.font_spacing);
+					double y = chart.evarea.y1 - max_rec_height - axis_x.font_spacing - (axis_x.title.text == "" ? 0 : axis_x.title.height + axis_x.font_spacing);
 					ctx.move_to (scr_x, y);
 					if (joint_x)
 						ctx.line_to (scr_x, chart.plarea.y0);
@@ -294,7 +293,7 @@ namespace CairoChart {
 						ctx.line_to (scr_x, double.min (y, chart.plarea.y0 + chart.plarea.height * (1.0 - place.zy1)));
 					break;
 				case Axis.Position.HIGH:
-					var print_y = chart.evarea.y0 + max_rec_height + axis_x.font_spacing + (axis_x.title.text == "" ? 0 : sz.height + axis_x.font_spacing);
+					var print_y = chart.evarea.y0 + max_rec_height + axis_x.font_spacing + (axis_x.title.text == "" ? 0 : axis_x.title.height + axis_x.font_spacing);
 					var print_x = compact_rec_x_pos (x, text_t);
 					ctx.move_to (print_x, print_y);
 
@@ -314,7 +313,7 @@ namespace CairoChart {
 					var line_style = grid.line_style;
 					if (joint_x) line_style.color = Color(0, 0, 0, 0.5);
 					line_style.apply(chart);
-					double y = chart.evarea.y0 + max_rec_height + axis_x.font_spacing + (axis_x.title.text == "" ? 0 : sz.height + axis_x.font_spacing);
+					double y = chart.evarea.y0 + max_rec_height + axis_x.font_spacing + (axis_x.title.text == "" ? 0 : axis_x.title.height + axis_x.font_spacing);
 					ctx.move_to (scr_x, y);
 					if (joint_x)
 						ctx.line_to (scr_x, chart.plarea.y1);
@@ -363,17 +362,15 @@ namespace CairoChart {
 				}
 			}
 
-			var sz = s.axis_x.title.size;
-
 			// 4.5. Draw Axis title
 			if (s.axis_x.title.text != "") {
 				var scr_x = chart.plarea.x0 + chart.plarea.width * (s.place.zx0 + s.place.zx1) / 2.0;
 				double scr_y = 0.0;
 				switch (s.axis_x.position) {
 				case Axis.Position.LOW: scr_y = chart.evarea.y1 - s.axis_x.font_spacing; break;
-				case Axis.Position.HIGH: scr_y = chart.evarea.y0 + s.axis_x.font_spacing + sz.height; break;
+				case Axis.Position.HIGH: scr_y = chart.evarea.y0 + s.axis_x.font_spacing + axis_x.title.height; break;
 				}
-				chart.ctx.move_to(scr_x - sz.width / 2.0, scr_y);
+				chart.ctx.move_to(scr_x - axis_x.title.width / 2.0, scr_y);
 				chart.color = s.axis_x.color;
 				if (chart.joint_x) chart.color = chart.joint_color;
 				s.axis_x.title.show();
@@ -388,7 +385,7 @@ namespace CairoChart {
 
 			if (nskip != 0) {--nskip; return;}
 
-			var tmp = max_rec_height + s.axis_x.font_spacing + (s.axis_x.title.text == "" ? 0 : sz.height + s.axis_x.font_spacing);
+			var tmp = max_rec_height + s.axis_x.font_spacing + (s.axis_x.title.text == "" ? 0 : axis_x.title.height + s.axis_x.font_spacing);
 			switch (s.axis_x.position) {
 			case Axis.Position.LOW: chart.evarea.y1 -= tmp; break;
 			case Axis.Position.HIGH: chart.evarea.y0 += tmp; break;
@@ -406,20 +403,18 @@ namespace CairoChart {
 				var text = axis_y.format.printf((LongDouble)y);
 				var scr_y = get_scr_y (y);
 				var text_t = new Text(chart, text, axis_y.font_style, axis_y.color);
-				var text_sz = text_t.size;
-				var sz = axis_y.title.size;
 
 				switch (axis_y.position) {
 				case Axis.Position.LOW:
-					ctx.move_to (chart.evarea.x0 + max_rec_width - text_sz.width + axis_y.font_spacing
+					ctx.move_to (chart.evarea.x0 + max_rec_width - text_t.width + axis_y.font_spacing
-					                 + (axis_y.title.text == "" ? 0 : sz.width + axis_y.font_spacing),
+					                 + (axis_y.title.text == "" ? 0 : axis_y.title.width + axis_y.font_spacing),
 					                 compact_rec_y_pos (y, text_t));
 					text_t.show();
 					// 6. Draw grid lines to the place.zx0.
 					var line_style = grid.line_style;
 					if (joint_y) line_style.color = Color(0, 0, 0, 0.5);
 					line_style.apply(chart);
-					double x = chart.evarea.x0 + max_rec_width + axis_y.font_spacing + (axis_y.title.text == "" ? 0 : sz.width + axis_y.font_spacing);
+					double x = chart.evarea.x0 + max_rec_width + axis_y.font_spacing + (axis_y.title.text == "" ? 0 : axis_y.title.width + axis_y.font_spacing);
 					ctx.move_to (x, scr_y);
 					if (joint_y)
 						ctx.line_to (chart.plarea.x1, scr_y);
@@ -427,15 +422,15 @@ namespace CairoChart {
 						ctx.line_to (double.max (x, chart.plarea.x0 + chart.plarea.width * place.zx1), scr_y);
 					break;
 				case Axis.Position.HIGH:
-					ctx.move_to (chart.evarea.x1 - text_sz.width - axis_y.font_spacing
+					ctx.move_to (chart.evarea.x1 - text_t.width - axis_y.font_spacing
-					                 - (axis_y.title.text == "" ? 0 : sz.width + axis_y.font_spacing),
+					                 - (axis_y.title.text == "" ? 0 : axis_y.title.width + axis_y.font_spacing),
 					                 compact_rec_y_pos (y, text_t));
 					text_t.show();
 					// 6. Draw grid lines to the place.zx1.
 					var line_style = grid.line_style;
 					if (joint_y) line_style.color = Color(0, 0, 0, 0.5);
 					line_style.apply(chart);
-					double x = chart.evarea.x1 - max_rec_width - axis_y.font_spacing - (axis_y.title.text == "" ? 0 : sz.width + axis_y.font_spacing);
+					double x = chart.evarea.x1 - max_rec_width - axis_y.font_spacing - (axis_y.title.text == "" ? 0 : axis_y.title.width + axis_y.font_spacing);
 					ctx.move_to (x, scr_y);
 					if (joint_y)
 						ctx.line_to (chart.plarea.x0, scr_y);
@@ -483,19 +478,17 @@ namespace CairoChart {
 				}
 			}
 
-			var sz = s.axis_y.title.size;
-
 			// 4.5. Draw Axis title
 			if (s.axis_y.title.text != "") {
 				var scr_y = chart.plarea.y0 + chart.plarea.height * (1.0 - (s.place.zy0 + s.place.zy1) / 2.0);
 				switch (s.axis_y.position) {
 				case Axis.Position.LOW:
-					var scr_x = chart.evarea.x0 + s.axis_y.font_spacing + sz.width;
+					var scr_x = chart.evarea.x0 + s.axis_y.font_spacing + axis_y.title.width;
-					chart.ctx.move_to(scr_x, scr_y + sz.height / 2.0);
+					chart.ctx.move_to(scr_x, scr_y + axis_y.title.height / 2.0);
 					break;
 				case Axis.Position.HIGH:
 					var scr_x = chart.evarea.x1 - s.axis_y.font_spacing;
-					chart.ctx.move_to(scr_x, scr_y + sz.height / 2.0);
+					chart.ctx.move_to(scr_x, scr_y + axis_y.title.height / 2.0);
 					break;
 				}
 				chart.color = s.axis_y.color;
@@ -512,7 +505,7 @@ namespace CairoChart {
 
 			if (nskip != 0) {--nskip; return;}
 
-			var tmp = max_rec_width + s.axis_y.font_spacing + (s.axis_y.title.text == "" ? 0 : sz.width + s.axis_y.font_spacing);
+			var tmp = max_rec_width + s.axis_y.font_spacing + (s.axis_y.title.text == "" ? 0 : axis_y.title.width + s.axis_y.font_spacing);
 			switch (s.axis_y.position) {
 			case Axis.Position.LOW: chart.evarea.x0 += tmp; break;
 			case Axis.Position.HIGH: chart.evarea.x1 -= tmp; break;
@@ -520,15 +513,13 @@ namespace CairoChart {
 		}
 
 		public virtual double compact_rec_x_pos (Float128 x, Text text) {
-			var sz = text.size;
+			return get_scr_x(x) - text.width / 2.0
-			return get_scr_x(x) - sz.width / 2.0
+			       - text.width * (x - (axis_x.range.zmin + axis_x.range.zmax) / 2.0) / axis_x.range.zrange;
-			       - sz.width * (x - (axis_x.range.zmin + axis_x.range.zmax) / 2.0) / axis_x.range.zrange;
 		}
 
 		public virtual double compact_rec_y_pos (Float128 y, Text text) {
-			var sz = text.size;
+			return get_scr_y(y) + text.height / 2.0
-			return get_scr_y(y) + sz.height / 2.0
+			       + text.height * (y - (axis_y.range.zmin + axis_y.range.zmax) / 2.0) / axis_y.range.zrange;
-			       + sz.height * (y - (axis_y.range.zmin + axis_y.range.zmax) / 2.0) / axis_y.range.zrange;
 		}
 
 		public virtual double get_scr_x (Float128 x) {

src/Text.vala

@@ -5,17 +5,40 @@ namespace CairoChart {
 	 */
 	public class Text {
 
-		Chart chart = null;
+		Chart chart;
+		string _text;
+		Font _font;
+		Cairo.TextExtents? _ext;
 
 		/**
 		 * ``Text`` string.
 		 */
-		public string text = "";
+		public string text {
+			get {
+				return _text;
+			}
+			set {
+				_text = value;
+				//_ext = null;// TODO: check necessity
+			}
+		}
 
 		/**
 		 * ``Text`` font style.
 		 */
-		public Font style = Font ();
+		public Font font {
+			get {
+				return _font;
+			}
+			set {
+				_font = value;
+				// TODO: check necessity
+				//_font.notify.connect((s, p) => {
+				//	_ext = null;
+				//});
+				//_ext = null;// TODO: check necessity
+			}
+		}
 
 		/**
 		 * ``Text`` color.
@@ -48,13 +71,14 @@ namespace CairoChart {
 		/**
 		 * Cairo ``Text`` extents.
 		 */
-		public virtual Cairo.TextExtents ext {
+		virtual Cairo.TextExtents ext {
 			get {
-				chart.ctx.select_font_face (style.family, style.slant, style.weight);
+				if (_ext == null) {
-				chart.ctx.set_font_size (style.size);
+					chart.ctx.select_font_face (font.family, font.slant, font.weight);
-				Cairo.TextExtents ext;
+					chart.ctx.set_font_size (font.size);
-				chart.ctx.text_extents (text, out ext);
+					chart.ctx.text_extents (text, out _ext);
-				return ext;
+				}
+				return _ext;
 			}
 			protected set {
 			}
@@ -65,7 +89,7 @@ namespace CairoChart {
 		 */
 		public virtual double width {
 			get {
-				switch (style.orient) {
+				switch (font.orient) {
 				case Gtk.Orientation.HORIZONTAL: return ext.width;
 				case Gtk.Orientation.VERTICAL: return ext.height;
 				default: return 0.0;
@@ -80,7 +104,7 @@ namespace CairoChart {
 		 */
 		public virtual double height {
 			get {
-				switch (style.orient) {
+				switch (font.orient) {
 				case Gtk.Orientation.HORIZONTAL: return ext.height;
 				case Gtk.Orientation.VERTICAL: return ext.width;
 				default: return 0.0;
@@ -93,7 +117,7 @@ namespace CairoChart {
 		/**
 		 * ``Text`` size.
 		 */
-		public struct Size {
+		struct Size {
 			/**
 			 * ``Text`` width.
 			 */
@@ -108,11 +132,11 @@ namespace CairoChart {
 		/**
 		 * ``Text`` @{link Size}.
 		 */
-		public virtual Size size {
+		virtual Size size {
 			get {
 				var sz = Size();
 				var e = ext;
-				switch (style.orient) {
+				switch (font.orient) {
 				case Gtk.Orientation.HORIZONTAL:
 					sz.width = e.width + e.x_bearing;
 					sz.height = e.height;
@@ -132,11 +156,11 @@ namespace CairoChart {
 		 * Show ``Text``.
 		 */
 		public virtual void show () {
-			chart.ctx.select_font_face(style.family,
+			chart.ctx.select_font_face(font.family,
-			                           style.slant,
+			                           font.slant,
-			                           style.weight);
+			                           font.weight);
-			chart.ctx.set_font_size(style.size);
+			chart.ctx.set_font_size(font.size);
-			if (style.orient == Gtk.Orientation.VERTICAL) {
+			if (font.orient == Gtk.Orientation.VERTICAL) {
 				chart.ctx.rotate(- GLib.Math.PI / 2.0);
 				chart.ctx.show_text(text);
 				chart.ctx.rotate(GLib.Math.PI / 2.0);
@@ -149,18 +173,22 @@ namespace CairoChart {
 		 * Constructs a new ``Text``.
 		 * @param chart ``Chart`` instance.
 		 * @param text ``Text`` string.
-		 * @param style ``Text`` font style.
+		 * @param font ``Text`` font style.
 		 * @param color ``Text`` color.
 		 */
 		public Text (Chart chart,
 		             string text = "",
-		             Font style = Font(),
+		             Font font = new Font(),
 		             Color color = Color()
 		) {
 			this.chart = chart;
 			this.text = text;
-			this.style = style;
+			this.font = font;
 			this.color = color;
+			// TODO: check necessity
+			//_font.notify.connect((s, p) => {
+			//	_ext = null;
+			//});
 		}
 
 		/**
@@ -169,8 +197,9 @@ namespace CairoChart {
 		public virtual Text copy () {
 			var text = new Text (chart);
 			text.chart = this.chart;
-			text.text = this.text;
+			text._text = this._text;
-			text.style = this.style;
+			text._font = this._font;
+			text._ext = this._ext;
 			text.color = this.color;
 			return text;
 		}