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src/com/bit101/charts/BarChart.as

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+/**
+ * BarChart.as
+ * Keith Peters
+ * version 0.9.10
+ * 
+ * A chart component for graphing an array of numeric data as a bar graph.
+ * 
+ * Copyright (c) 2011 Keith Peters
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.bit101.charts
+{
+	import flash.display.DisplayObjectContainer;
+
+	public class BarChart extends Chart
+	{
+		protected var _spacing:Number = 2;
+		protected var _barColor:uint = 0x999999;
+
+		/**
+		 * Constructor
+		 * @param parent The parent DisplayObjectContainer on which to add this Label.
+		 * @param xpos The x position to place this component.
+		 * @param ypos The y position to place this component.
+		 * @param data The array of numeric values to graph.
+		 */
+		public function BarChart(parent:DisplayObjectContainer=null, xpos:Number=0, ypos:Number=0, data:Array=null)
+		{
+			super(parent, xpos, ypos, data);
+		}
+
+		/**
+		 * Graphs the numeric data in the chart.
+		 */
+		protected override function drawChart():void
+		{
+			var border:Number = 2;
+			var totalSpace:Number = _spacing * _data.length;
+			var barWidth:Number = (_width - border - totalSpace) / _data.length;
+			var chartHeight:Number = _height - border;
+			_chartHolder.x = 0;
+			_chartHolder.y = _height;
+			var xpos:Number = border;
+			var max:Number = getMaxValue();
+			var min:Number = getMinValue();
+			var scale:Number = chartHeight / (max - min);
+			for(var i:int = 0; i < _data.length; i++)
+			{
+				if(_data[i] != null)
+				{
+					_chartHolder.graphics.beginFill(_barColor);
+					_chartHolder.graphics.drawRect(xpos, 0, barWidth, (_data[i] - min) * -scale);
+					_chartHolder.graphics.endFill();
+				}
+				xpos += barWidth + _spacing;
+			}
+		}
+
+
+
+		///////////////////////////////////
+		// getter/setters
+		///////////////////////////////////
+
+		/**
+		 * Sets/gets the amount of space shown between each bar. If this is too wide, bars may become invisible.
+		 */
+		public function set spacing(value:Number):void
+		{
+			_spacing = value;
+			invalidate();
+		}
+		public function get spacing():Number
+		{
+			return _spacing;
+		}
+
+		/**
+		 * Sets/gets the color of the bars.
+		 */
+		public function set barColor(value:uint):void
+		{
+			_barColor = value;
+			invalidate();
+		}
+		public function get barColor():uint
+		{
+			return _barColor;
+		}
+
+
+	}
+}