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src/Chart.vala

@@ -8,7 +8,19 @@ namespace CairoChart {
 		/**
 		 * Chart Position.
 		 */
-		public Cairo.Rectangle pos = Cairo.Rectangle();
+		public Cairo.Rectangle area = Cairo.Rectangle();
+
+		/**
+		 * Current evaluated area.
+		 */
+		public Cairo.Rectangle evarea = Cairo.Rectangle()
+		                                   { x = 0, y = 0, width = 1, height = 1 };
+
+		/**
+		 * Zoom Limits (relative coordinates: 0.0-1.0).
+		 */
+		public Cairo.Rectangle zoom = Cairo.Rectangle()
+		                              { x = 0, y = 0, width = 1, height = 1 };
 
 		/**
 		 * Cairo Context of the Drawing Area.
@@ -20,16 +32,16 @@ namespace CairoChart {
 		 */
 		public Color bg_color = Color(1, 1, 1);
 
-		/**
-		 * Chart Title.
-		 */
-		public Text title = new Text ("Cairo Chart");
-
 		/**
 		 * Border Color.
 		 */
 		public Color border_color = Color(0, 0, 0, 0.3);
 
+		/**
+		 * Chart Title.
+		 */
+		public Text title = new Text("Cairo Chart");
+
 		/**
 		 * Legend.
 		 */
@@ -40,18 +52,6 @@ namespace CairoChart {
 		 */
 		public Series[] series = {};
 
-		/**
-		 * Current calculated Plot Position.
-		 */
-		public Cairo.Rectangle calc_pos = Cairo.Rectangle()
-		                                  { x = 0, y = 0, width = 1, height = 1 };
-
-		/**
-		 * Zoom Limits (relative coordinates: 0.0-1.0).
-		 */
-		public Cairo.Rectangle zoom = Cairo.Rectangle()
-		                              { x = 0, y = 0, width = 1, height = 1 };
-
 		/**
 		 * 1'st shown series index in zoom area.
 		 */
@@ -61,6 +61,11 @@ namespace CairoChart {
 
 		public Line.Style selection_style = Line.Style ();
 
+		/**
+		 * Plot Area Bounds.
+		 */
+		//public Cairo.Rectangle plot = ;
+
 		public double plot_x_min = 0;
 		public double plot_x_max = 0;
 		public double plot_y_min = 0;
@@ -88,7 +93,7 @@ namespace CairoChart {
 			chart.joint_x = this.joint_x;
 			chart.joint_y = this.joint_y;
 			chart.ctx = this.ctx;
-			chart.calc_pos = this.calc_pos;
+			chart.evarea = this.evarea;
 			chart.cursors = this.cursors.copy();
 			chart.legend = this.legend.copy();
 			chart.plot_x_max = this.plot_x_max;
@@ -100,14 +105,14 @@ namespace CairoChart {
 			chart.series = this.series;
 			chart.title = this.title.copy();
 			chart.title_indent = this.title_indent;
-			chart.pos = this.pos;
+			chart.area = this.area;
 			chart.zoom_1st_idx = this.zoom_1st_idx;
 			return chart;
 		}
 
-		protected virtual void fix_calc_pos () {
+		protected virtual void fix_evarea () {
-			if (calc_pos.width < 0) calc_pos.width = 0;
+			if (evarea.width < 0) evarea.width = 0;
-			if (calc_pos.height < 0) calc_pos.height = 0;
+			if (evarea.height < 0) evarea.height = 0;
 		}
 		protected virtual void set_vertical_axes_titles () {
 			for (var si = 0; si < series.length; ++si) {
@@ -126,13 +131,13 @@ namespace CairoChart {
 
 		public virtual bool draw () {
 
-			calc_pos = pos;
+			evarea = area;
 
 			draw_chart_title ();
-			fix_calc_pos ();
+			fix_evarea ();
 
 			legend.draw (this);
-			fix_calc_pos ();
+			fix_evarea ();
 
 			set_vertical_axes_titles ();
 
@@ -141,29 +146,29 @@ namespace CairoChart {
 			calc_plot_area ();
 
 			draw_horizontal_axes ();
-			fix_calc_pos ();
+			fix_evarea ();
 
 			draw_vertical_axes ();
-			fix_calc_pos ();
+			fix_evarea ();
 
 			draw_plot_area_border ();
-			fix_calc_pos ();
+			fix_evarea ();
 
 			draw_series ();
-			fix_calc_pos ();
+			fix_evarea ();
 
 			cursors.draw_cursors (this);
-			fix_calc_pos ();
+			fix_evarea ();
 
 			return true;
 		}
 		protected virtual void draw_chart_title () {
 			var sz = title.get_size(ctx);
 			var title_height = sz.height + (legend.position == Legend.Position.TOP ? title_indent * 2 : title_indent);
-			calc_pos.y += title_height;
+			evarea.y += title_height;
-			calc_pos.height -= title_height;
+			evarea.height -= title_height;
 			color = title.color;
-			ctx.move_to (pos.width/2 - sz.width/2, sz.height + title_indent);
+			ctx.move_to (area.width/2 - sz.width/2, sz.height + title_indent);
 			title.show(ctx);
 		}
 		public virtual void draw_selection (Cairo.Rectangle rect) {
@@ -298,10 +303,10 @@ namespace CairoChart {
 				series[si].join_calc(is_x, si, ref nskip);
 		}
 		protected virtual void calc_plot_area () {
-			plot_x_min = calc_pos.x + legend.indent;
+			plot_x_min = evarea.x + legend.indent;
-			plot_x_max = calc_pos.x + calc_pos.width - legend.indent;
+			plot_x_max = evarea.x + evarea.width - legend.indent;
-			plot_y_min = calc_pos.y + legend.indent;
+			plot_y_min = evarea.y + legend.indent;
-			plot_y_max = calc_pos.y + calc_pos.height - legend.indent;
+			plot_y_max = evarea.y + evarea.height - legend.indent;
 
 			// Check for joint axes
 			joint_x = joint_y = true;

src/Cursor.vala

@@ -301,13 +301,13 @@ namespace CairoChart {
 						var time_text_t = new Text(time_text, s.axis_x.font_style, s.axis_x.color);
 						var print_y = 0.0;
 						switch (s.axis_x.position) {
-							case Axis.Position.LOW: print_y = chart.pos.y + chart.pos.height - s.axis_x.font_indent
+							case Axis.Position.LOW: print_y = chart.area.y + chart.area.height - s.axis_x.font_indent
 								                    - (chart.legend.position == Legend.Position.BOTTOM ? chart.legend.height : 0);
 								break;
 							case Axis.Position.HIGH:
 								var title_height = chart.title.get_height(chart.ctx) + (chart.legend.position == Legend.Position.TOP ?
 								                   chart.title_indent * 2 : chart.title_indent);
-								print_y = chart.pos.y + title_height + s.axis_x.font_indent
+								print_y = chart.area.y + title_height + s.axis_x.font_indent
 								          + (chart.legend.position == Legend.Position.TOP ? chart.legend.height : 0);
 								switch (s.axis_x.type) {
 								case Axis.Type.NUMBERS:
@@ -351,11 +351,11 @@ namespace CairoChart {
 						var print_x = 0.0;
 						switch (s.axis_y.position) {
 						case Axis.Position.LOW:
-							print_x = chart.pos.x + s.axis_y.font_indent
+							print_x = chart.area.x + s.axis_y.font_indent
 							          + (chart.legend.position == Legend.Position.LEFT ? chart.legend.width : 0);
 							break;
 						case Axis.Position.HIGH:
-							print_x = chart.pos.x + chart.pos.width - text_t.get_width(chart.ctx) - s.axis_y.font_indent
+							print_x = chart.area.x + chart.area.width - text_t.get_width(chart.ctx) - s.axis_y.font_indent
 							          - (chart.legend.position == Legend.Position.RIGHT ? chart.legend.width : 0);
 							break;
 						}

src/Legend.vala

@@ -51,25 +51,25 @@ namespace CairoChart {
 			if (chart.ctx != null) {
 				switch (position) {
 				case Position.TOP:
-					x0 = (chart.pos.width - width) / 2;
+					x0 = (chart.area.width - width) / 2;
 					var title_height = chart.title.get_height(chart.ctx) + (chart.legend.position == Legend.Position.TOP ?
 					                   chart.title_indent * 2 : chart.title_indent);
 					y0 = title_height;
 				break;
 
 				case Position.BOTTOM:
-					x0 = (chart.pos.width - width) / 2;
+					x0 = (chart.area.width - width) / 2;
-					y0 = chart.pos.height - height;
+					y0 = chart.area.height - height;
 				break;
 
 				case Position.LEFT:
 					x0 = 0;
-					y0 = (chart.pos.height - height) / 2;
+					y0 = (chart.area.height - height) / 2;
 				break;
 
 				case Position.RIGHT:
-					x0 = chart.pos.width - width;
+					x0 = chart.area.width - width;
-					y0 = (chart.pos.height - height) / 2;
+					y0 = (chart.area.height - height) / 2;
 				break;
 				}
 				chart.color = bg_color;
@@ -122,7 +122,7 @@ namespace CairoChart {
 				case Position.TOP:
 				case Position.BOTTOM:
 					var ser_title_width = title_sz.width + line_length;
-					if (leg_width_sum + (leg_width_sum == 0 ? 0 : text_hspace) + ser_title_width > chart.pos.width) { // carry
+					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) {
 						case ProcessType.CALC:
@@ -203,18 +203,18 @@ namespace CairoChart {
 				height = leg_height_sum;
 				switch (position) {
 					case Position.TOP:
-						chart.calc_pos.y += height;
+						chart.evarea.y += height;
-						chart.calc_pos.height -= height;
+						chart.evarea.height -= height;
 						break;
 					case Position.BOTTOM:
-						chart.calc_pos.height -= height;
+						chart.evarea.height -= height;
 						break;
 					case Position.LEFT:
-						chart.calc_pos.x += width;
+						chart.evarea.x += width;
-						chart.calc_pos.width -= width;
+						chart.evarea.width -= width;
 						break;
 					case Position.RIGHT:
-						chart.calc_pos.width -= width;
+						chart.evarea.width -= width;
 						break;
 				}
 				break;

src/Series.vala

@@ -258,7 +258,7 @@ namespace CairoChart {
 
 				switch (axis_x.position) {
 				case Axis.Position.LOW:
-					var print_y = chart.calc_pos.y + chart.calc_pos.height - axis_x.font_indent - (axis_x.title.text == "" ? 0 : sz.height + axis_x.font_indent);
+					var print_y = chart.evarea.y + chart.evarea.height - axis_x.font_indent - (axis_x.title.text == "" ? 0 : sz.height + axis_x.font_indent);
 					var print_x = compact_rec_x_pos (x, text_t);
 					ctx.move_to (print_x, print_y);
 					switch (axis_x.type) {
@@ -277,7 +277,7 @@ namespace CairoChart {
 					var line_style = grid.line_style;
 					if (joint_x) line_style.color = Color(0, 0, 0, 0.5);
 					line_style.set(chart);
-					double y = chart.calc_pos.y + chart.calc_pos.height - max_rec_height - axis_x.font_indent - (axis_x.title.text == "" ? 0 : sz.height + axis_x.font_indent);
+					double y = chart.evarea.y + chart.evarea.height - max_rec_height - axis_x.font_indent - (axis_x.title.text == "" ? 0 : sz.height + axis_x.font_indent);
 					ctx.move_to (scr_x, y);
 					if (joint_x)
 						ctx.line_to (scr_x, chart.plot_y_min);
@@ -285,7 +285,7 @@ namespace CairoChart {
 						ctx.line_to (scr_x, double.min (y, chart.plot_y_max - (chart.plot_y_max - chart.plot_y_min) * place.zoom_y_max));
 					break;
 				case Axis.Position.HIGH:
-					var print_y = chart.calc_pos.y + max_rec_height + axis_x.font_indent + (axis_x.title.text == "" ? 0 : sz.height + axis_x.font_indent);
+					var print_y = chart.evarea.y + max_rec_height + axis_x.font_indent + (axis_x.title.text == "" ? 0 : sz.height + axis_x.font_indent);
 					var print_x = compact_rec_x_pos (x, text_t);
 					ctx.move_to (print_x, print_y);
 
@@ -305,7 +305,7 @@ namespace CairoChart {
 					var line_style = grid.line_style;
 					if (joint_x) line_style.color = Color(0, 0, 0, 0.5);
 					line_style.set(chart);
-					double y = chart.calc_pos.y + max_rec_height + axis_x.font_indent + (axis_x.title.text == "" ? 0 : sz.height + axis_x.font_indent);
+					double y = chart.evarea.y + max_rec_height + axis_x.font_indent + (axis_x.title.text == "" ? 0 : sz.height + axis_x.font_indent);
 					ctx.move_to (scr_x, y);
 					if (joint_x)
 						ctx.line_to (scr_x, chart.plot_y_max);
@@ -348,8 +348,8 @@ namespace CairoChart {
 			// 4.2. Cursor values for joint X axis
 			if (chart.joint_x && chart.cursors.cursor_style.orientation == Cursors.Orientation.VERTICAL && chart.cursors.cursors_crossings.length != 0) {
 				switch (s.axis_x.position) {
-				case Axis.Position.LOW: chart.calc_pos.height -= max_rec_height + s.axis_x.font_indent; break;
+				case Axis.Position.LOW: chart.evarea.height -= max_rec_height + s.axis_x.font_indent; break;
-				case Axis.Position.HIGH: var tmp = max_rec_height + s.axis_x.font_indent; chart.calc_pos.y += tmp; chart.calc_pos.height -= tmp; break;
+				case Axis.Position.HIGH: var tmp = max_rec_height + s.axis_x.font_indent; chart.evarea.y += tmp; chart.evarea.height -= tmp; break;
 				}
 			}
 
@@ -360,8 +360,8 @@ namespace CairoChart {
 				var scr_x = chart.plot_x_min + (chart.plot_x_max - chart.plot_x_min) * (s.place.zoom_x_min + s.place.zoom_x_max) / 2.0;
 				double scr_y = 0.0;
 				switch (s.axis_x.position) {
-				case Axis.Position.LOW: scr_y = chart.calc_pos.y + chart.calc_pos.height - s.axis_x.font_indent; break;
+				case Axis.Position.LOW: scr_y = chart.evarea.y + chart.evarea.height - s.axis_x.font_indent; break;
-				case Axis.Position.HIGH: scr_y = chart.calc_pos.y + s.axis_x.font_indent + sz.height; break;
+				case Axis.Position.HIGH: scr_y = chart.evarea.y + s.axis_x.font_indent + sz.height; break;
 				}
 				chart.ctx.move_to(scr_x - sz.width / 2.0, scr_y);
 				chart.color = s.axis_x.color;
@@ -380,12 +380,12 @@ namespace CairoChart {
 
 			switch (s.axis_x.position) {
 			case Axis.Position.LOW:
-				chart.calc_pos.height -= max_rec_height + s.axis_x.font_indent
+				chart.evarea.height -= max_rec_height + s.axis_x.font_indent
 				             + (s.axis_x.title.text == "" ? 0 : sz.height + s.axis_x.font_indent);
 				break;
 			case Axis.Position.HIGH:
 				var tmp = max_rec_height + s.axis_x.font_indent + (s.axis_x.title.text == "" ? 0 : sz.height + s.axis_x.font_indent);
-				chart.calc_pos.y += tmp; chart.calc_pos.height -= tmp;
+				chart.evarea.y += tmp; chart.evarea.height -= tmp;
 				break;
 			}
 		}
@@ -406,7 +406,7 @@ namespace CairoChart {
 
 				switch (axis_y.position) {
 				case Axis.Position.LOW:
-					ctx.move_to (chart.calc_pos.x + max_rec_width - text_sz.width + axis_y.font_indent
+					ctx.move_to (chart.evarea.x + max_rec_width - text_sz.width + axis_y.font_indent
 					                 + (axis_y.title.text == "" ? 0 : sz.width + axis_y.font_indent),
 					                 compact_rec_y_pos (y, text_t));
 					text_t.show(ctx);
@@ -414,7 +414,7 @@ namespace CairoChart {
 					var line_style = grid.line_style;
 					if (joint_y) line_style.color = Color(0, 0, 0, 0.5);
 					line_style.set(chart);
-					double x = chart.calc_pos.x + max_rec_width + axis_y.font_indent + (axis_y.title.text == "" ? 0 : sz.width + axis_y.font_indent);
+					double x = chart.evarea.x + max_rec_width + axis_y.font_indent + (axis_y.title.text == "" ? 0 : sz.width + axis_y.font_indent);
 					ctx.move_to (x, scr_y);
 					if (joint_y)
 						ctx.line_to (chart.plot_x_max, scr_y);
@@ -422,7 +422,7 @@ namespace CairoChart {
 						ctx.line_to (double.max (x, chart.plot_x_min + (chart.plot_x_max - chart.plot_x_min) * place.zoom_x_max), scr_y);
 					break;
 				case Axis.Position.HIGH:
-					ctx.move_to (chart.calc_pos.x + chart.calc_pos.width - text_sz.width - axis_y.font_indent
+					ctx.move_to (chart.evarea.x + chart.evarea.width - text_sz.width - axis_y.font_indent
 					                 - (axis_y.title.text == "" ? 0 : sz.width + axis_y.font_indent),
 					                 compact_rec_y_pos (y, text_t));
 					text_t.show(ctx);
@@ -430,7 +430,7 @@ namespace CairoChart {
 					var line_style = grid.line_style;
 					if (joint_y) line_style.color = Color(0, 0, 0, 0.5);
 					line_style.set(chart);
-					double x = chart.calc_pos.x + chart.calc_pos.width - max_rec_width - axis_y.font_indent - (axis_y.title.text == "" ? 0 : sz.width + axis_y.font_indent);
+					double x = chart.evarea.x + chart.evarea.width - max_rec_width - axis_y.font_indent - (axis_y.title.text == "" ? 0 : sz.width + axis_y.font_indent);
 					ctx.move_to (x, scr_y);
 					if (joint_y)
 						ctx.line_to (chart.plot_x_min, scr_y);
@@ -472,8 +472,8 @@ namespace CairoChart {
 			// 4.2. Cursor values for joint Y axis
 			if (chart.joint_y && chart.cursors.cursor_style.orientation == Cursors.Orientation.HORIZONTAL && chart.cursors.cursors_crossings.length != 0) {
 				switch (s.axis_y.position) {
-				case Axis.Position.LOW: var tmp = max_rec_width + s.axis_y.font_indent; chart.calc_pos.x += tmp; chart.calc_pos.width -= tmp; break;
+				case Axis.Position.LOW: var tmp = max_rec_width + s.axis_y.font_indent; chart.evarea.x += tmp; chart.evarea.width -= tmp; break;
-				case Axis.Position.HIGH: chart.calc_pos.width -= max_rec_width + s.axis_y.font_indent; break;
+				case Axis.Position.HIGH: chart.evarea.width -= max_rec_width + s.axis_y.font_indent; break;
 				}
 			}
 
@@ -484,11 +484,11 @@ namespace CairoChart {
 				var scr_y = chart.plot_y_max - (chart.plot_y_max - chart.plot_y_min) * (s.place.zoom_y_min + s.place.zoom_y_max) / 2.0;
 				switch (s.axis_y.position) {
 				case Axis.Position.LOW:
-					var scr_x = chart.calc_pos.x + s.axis_y.font_indent + sz.width;
+					var scr_x = chart.evarea.x + s.axis_y.font_indent + sz.width;
 					chart.ctx.move_to(scr_x, scr_y + sz.height / 2.0);
 					break;
 				case Axis.Position.HIGH:
-					var scr_x = chart.calc_pos.x + chart.calc_pos.width - s.axis_y.font_indent;
+					var scr_x = chart.evarea.x + chart.evarea.width - s.axis_y.font_indent;
 					chart.ctx.move_to(scr_x, scr_y + sz.height / 2.0);
 					break;
 				}
@@ -509,10 +509,10 @@ namespace CairoChart {
 			switch (s.axis_y.position) {
 			case Axis.Position.LOW:
 				var tmp = max_rec_width + s.axis_y.font_indent + (s.axis_y.title.text == "" ? 0 : sz.width + s.axis_y.font_indent);
-				chart.calc_pos.x += tmp; chart.calc_pos.width -= tmp;
+				chart.evarea.x += tmp; chart.evarea.width -= tmp;
 				break;
 			case Axis.Position.HIGH:
-				chart.calc_pos.width -= max_rec_width + s.axis_y.font_indent
+				chart.evarea.width -= max_rec_width + s.axis_y.font_indent
 				             + (s.axis_y.title.text == "" ? 0 : sz.width + s.axis_y.font_indent); break;
 			}
 		}

test/ChartTest.vala

@@ -415,8 +415,8 @@ int main (string[] args) {
 
 	da.draw.connect((ctx) => {
 		chart.ctx = ctx;
-		chart.pos.width = da.get_allocated_width();
+		chart.area.width = da.get_allocated_width();
-		chart.pos.height = da.get_allocated_height();
+		chart.area.height = da.get_allocated_height();
 		chart.clear();
 
 		// user's pre draw operations here...