I was playing with charts the other day and there was a requirement which requires me to find the minimum and the maximum points of the chart. Therefore, I have came up with this demo to help you is understanding charts better. :D
Source of the main application file - SimpleChartHorizontalAxis.mxml<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute"
minWidth="800"
creationComplete="completeHandler(event)">
<mx:Script>
<![CDATA[
import mx.charts.HitData;
import mx.charts.series.LineSeries;
import mx.collections.ArrayCollection;
import mx.collections.Sort;
import mx.collections.SortField;
import mx.events.FlexEvent;
import mx.events.ListEvent;
import mx.formatters.DateFormatter;
//Records used in the chart
[Bindable]
private var myData:XML =
<records>
<record>
<date>16/11/2012</date>
<people>74</people>
</record>
<record>
<date>24/07/2013</date>
<people>99</people>
</record>
<record>
<date>05/04/2013</date>
<people>79</people>
</record>
<record>
<date>08/07/2012</date>
<people>54</people>
</record>
<record>
<date>22/11/2012</date>
<people>42</people>
</record>
<record>
<date>10/04/2012</date>
<people>42</people>
</record>
<record>
<date>17/03/2012</date>
<people>57</people>
</record>
<record>
<date>16/10/2011</date>
<people>63</people>
</record>
<record>
<date>06/02/2012</date>
<people>80</people>
</record>
<record>
<date>09/01/2012</date>
<people>2</people>
</record>
<record>
<date>18/11/2011</date>
<people>100</people>
</record>
<record>
<date>25/11/2011</date>
<people>88</people>
</record>
<record>
<date>29/05/2012</date>
<people>94</people>
</record>
<record>
<date>30/03/2013</date>
<people>99</people>
</record>
<record>
<date>08/09/2012</date>
<people>33</people>
</record>
<record>
<date>26/01/2012</date>
<people>33</people>
</record>
<record>
<date>12/11/2012</date>
<people>48</people>
</record>
<record>
<date>17/05/2013</date>
<people>57</people>
</record>
<record>
<date>13/04/2012</date>
<people>57</people>
</record>
<record>
<date>18/07/2013</date>
<people>81</people>
</record>
<record>
<date>09/08/2012</date>
<people>60</people>
</record>
<record>
<date>04/09/2012</date>
<people>49</people>
</record>
<record>
<date>29/12/2012</date>
<people>15</people>
</record>
<record>
<date>17/08/2011</date>
<people>1</people>
</record>
<record>
<date>09/10/2012</date>
<people>76</people>
</record>
<record>
<date>20/02/2012</date>
<people>62</people>
</record>
<record>
<date>24/06/2013</date>
<people>70</people>
</record>
<record>
<date>17/07/2013</date>
<people>17</people>
</record>
<record>
<date>21/04/2012</date>
<people>32</people>
</record>
<record>
<date>11/04/2013</date>
<people>92</people>
</record>
<record>
<date>02/08/2013</date>
<people>97</people>
</record>
<record>
<date>27/12/2011</date>
<people>5</people>
</record>
<record>
<date>01/05/2012</date>
<people>90</people>
</record>
<record>
<date>20/04/2013</date>
<people>75</people>
</record>
<record>
<date>26/10/2012</date>
<people>60</people>
</record>
<record>
<date>02/01/2012</date>
<people>31</people>
</record>
<record>
<date>04/02/2013</date>
<people>17</people>
</record>
<record>
<date>17/04/2013</date>
<people>16</people>
</record>
<record>
<date>22/03/2013</date>
<people>94</people>
</record>
<record>
<date>10/09/2011</date>
<people>97</people>
</record>
<record>
<date>27/11/2012</date>
<people>18</people>
</record>
<record>
<date>15/03/2013</date>
<people>94</people>
</record>
<record>
<date>17/10/2011</date>
<people>85</people>
</record>
<record>
<date>18/03/2012</date>
<people>12</people>
</record>
<record>
<date>09/10/2011</date>
<people>92</people>
</record>
<record>
<date>08/09/2012</date>
<people>17</people>
</record>
<record>
<date>22/10/2012</date>
<people>45</people>
</record>
<record>
<date>09/11/2012</date>
<people>40</people>
</record>
<record>
<date>06/09/2012</date>
<people>75</people>
</record>
<record>
<date>13/08/2012</date>
<people>2</people>
</record>
<record>
<date>04/03/2012</date>
<people>20</people>
</record>
<record>
<date>17/11/2012</date>
<people>34</people>
</record>
<record>
<date>01/02/2012</date>
<people>51</people>
</record>
<record>
<date>29/08/2011</date>
<people>35</people>
</record>
<record>
<date>11/02/2012</date>
<people>35</people>
</record>
<record>
<date>02/06/2012</date>
<people>26</people>
</record>
<record>
<date>20/01/2013</date>
<people>98</people>
</record>
<record>
<date>07/02/2013</date>
<people>4</people>
</record>
<record>
<date>27/08/2012</date>
<people>44</people>
</record>
<record>
<date>12/12/2012</date>
<people>29</people>
</record>
<record>
<date>18/03/2012</date>
<people>96</people>
</record>
<record>
<date>01/09/2012</date>
<people>40</people>
</record>
<record>
<date>09/02/2013</date>
<people>34</people>
</record>
<record>
<date>22/09/2012</date>
<people>86</people>
</record>
<record>
<date>28/02/2012</date>
<people>14</people>
</record>
<record>
<date>02/02/2012</date>
<people>94</people>
</record>
<record>
<date>08/06/2013</date>
<people>16</people>
</record>
<record>
<date>23/03/2012</date>
<people>32</people>
</record>
<record>
<date>21/03/2013</date>
<people>10</people>
</record>
<record>
<date>07/04/2013</date>
<people>10</people>
</record>
<record>
<date>11/03/2013</date>
<people>28</people>
</record>
<record>
<date>02/11/2012</date>
<people>28</people>
</record>
<record>
<date>14/11/2011</date>
<people>3</people>
</record>
<record>
<date>05/02/2013</date>
<people>12</people>
</record>
<record>
<date>21/03/2013</date>
<people>41</people>
</record>
<record>
<date>30/09/2012</date>
<people>96</people>
</record>
<record>
<date>19/02/2013</date>
<people>29</people>
</record>
<record>
<date>09/07/2013</date>
<people>86</people>
</record>
<record>
<date>30/04/2013</date>
<people>35</people>
</record>
<record>
<date>21/01/2012</date>
<people>4</people>
</record>
<record>
<date>26/06/2013</date>
<people>88</people>
</record>
<record>
<date>17/04/2013</date>
<people>55</people>
</record>
<record>
<date>04/10/2011</date>
<people>38</people>
</record>
<record>
<date>20/03/2013</date>
<people>38</people>
</record>
<record>
<date>19/05/2013</date>
<people>91</people>
</record>
<record>
<date>28/08/2011</date>
<people>73</people>
</record>
<record>
<date>31/08/2011</date>
<people>65</people>
</record>
<record>
<date>11/03/2013</date>
<people>88</people>
</record>
<record>
<date>10/06/2013</date>
<people>78</people>
</record>
<record>
<date>03/07/2013</date>
<people>8</people>
</record>
<record>
<date>08/10/2012</date>
<people>16</people>
</record>
<record>
<date>19/03/2012</date>
<people>74</people>
</record>
<record>
<date>28/09/2012</date>
<people>49</people>
</record>
<record>
<date>29/07/2013</date>
<people>51</people>
</record>
<record>
<date>05/10/2012</date>
<people>60</people>
</record>
<record>
<date>18/02/2012</date>
<people>63</people>
</record>
<record>
<date>03/09/2011</date>
<people>45</people>
</record>
<record>
<date>30/12/2011</date>
<people>76</people>
</record>
<record>
<date>11/04/2013</date>
<people>96</people>
</record>
<record>
<date>15/06/2012</date>
<people>55</people>
</record>
</records>;
private var minDate:Date = null;
private var maxDate:Date = null;
private var minSelDate:Date = null;
private var maxSelDate:Date = null;
private var dateCollection:ArrayCollection;
protected function completeHandler(event:FlexEvent):void
{
// Parsing the xml data into ArrayCollection
var objArray:ArrayCollection = new ArrayCollection();
var tempObj:Object;
var dateArray:Array;
var tempDate:Date;
for(var i:int = 0; i < myData.record.length(); i ++)
{
tempObj = new Object();
dateArray = String(myData.record[i].date).split("/");
//Convert the date data into a Date Object
tempDate = new Date(dateArray[2],
Number(dateArray[1]) - 1,
dateArray[0]);
parseDate(tempDate);
tempObj.date = tempDate;
tempObj.time = tempDate.time;
tempObj.people = myData.record[i].people;
objArray.addItem(tempObj);
}
// Create the new series and set its properties.
var localSeries:LineSeries = new LineSeries();
localSeries.dataProvider = objArray;
localSeries.yField = "people";
localSeries.xField = "date";
// Back up the current series on the chart.
var currentSeries:Array = mainChart.series;
// Add the new series to the current Array of series.
currentSeries.push(localSeries);
// Add the new Array of series to the chart.
mainChart.series = currentSeries;
//We are creating the options for the combo box or
//drop down menu over here.
dateCollection = new ArrayCollection();
tempDate.time = minDate.time;
var tempDate2:Date = new Date();
tempDate2.time = maxDate.time;
tempDate2.date = 1;
tempDate2.month += 1;
while (tempDate.time <= tempDate2.time)
{
tempObj = new Object;
tempObj.label = dateFormatter(tempDate);
tempObj.date = tempDate.time;
dateCollection.addItem(tempObj);
tempDate.month += 1;
}
cb1.dataProvider = dateCollection;
cb1.selectedIndex = 0;
cb2.dataProvider = dateCollection;
cb2.selectedIndex = dateCollection.length - 1;
//Assigning the Minimum and the Maximum value
//of the horizontal axis
dateAxis.minimum = minDate;
dateAxis.maximum = maxDate;
}
//This function will return a string based on the
//Date format DD/MM/YYYY.
private function dateFormatter(tempDate:Date):String
{
var fmt:DateFormatter = new DateFormatter();
fmt.formatString = "DD/MM/YYYY";
return fmt.format(tempDate);
}
//This function will be used in finding the minimum
//and the maximum Date of the data. And based on the
//minimum Date, we will round off to the first day
//of the month and last day of the month for the
//maximum date.
private function parseDate(tempDate:Date):void
{
if(minDate == null)
{
minDate = new Date();
minDate.time = tempDate.time;
minDate.date = 1;
}else{
if(minDate.time > tempDate.time)
{
minDate.time = tempDate.time;
minDate.date = 1;
}
}
if(maxDate == null)
{
maxDate = new Date();
maxDate.time = tempDate.time;
maxDate.date = 1;
maxDate.month += 1;
maxDate.date = 0;
}else{
if(maxDate.time < tempDate.time)
{
maxDate.time = tempDate.time;
maxDate.date = 1;
maxDate.month += 1;
maxDate.date = 0;
}
}
}
//We are customizing the datatip / tool tip of the
//chart data.
public function myDataTipFunction(e:HitData):String {
var s:String = "";
var tempDate:Date = e.item.date as Date;
s += "Date: " + dateFormatter(tempDate) + "<br>";
s += "No. of People: " + e.item.people;
return s;
}
//Upon changing the values of the combobox, we will
//set the minimum and maximum data of the chart
//based on the combobox selections
protected function changeHandler(event:ListEvent):void
{
minSelDate = new Date();
minSelDate.time = cb1.selectedItem.date;
maxSelDate = new Date();
maxSelDate.time = cb2.selectedItem.date;
if(minSelDate.time < maxSelDate.time)
{
dateAxis.minimum = minSelDate;
dateAxis.maximum = maxSelDate;
}else{
dateAxis.minimum = maxSelDate;
dateAxis.maximum = minSelDate;
}
}
//Upon clicking on the 'Reset' button, we will
//update the values of the comboxbox and the chart.
protected function clickHandler(event:MouseEvent):void
{
cb1.selectedIndex = 0;
cb2.selectedIndex = dateCollection.length - 1;
dateAxis.minimum = minDate;
dateAxis.maximum = maxDate;
}
]]>
</mx:Script>
<mx:VBox verticalGap="5" width="100%" height="100%"
verticalAlign="middle">
<mx:HBox width="100%" horizontalAlign="center">
<mx:LineChart id="mainChart"
showDataTips="true"
width="95%"
dataTipFunction="myDataTipFunction" >
<mx:horizontalAxis>
<mx:DateTimeAxis dataUnits="days" id="dateAxis"
alignLabelsToUnits="true"/>
</mx:horizontalAxis>
</mx:LineChart>
</mx:HBox>
<mx:HBox width="100%" horizontalAlign="center">
<mx:Label text="Display Data between"/>
<mx:ComboBox id="cb1" change="changeHandler(event)"/>
<mx:Label text="and"/>
<mx:ComboBox id="cb2" change="changeHandler(event)"/>
</mx:HBox>
<mx:HBox width="100%" horizontalAlign="center">
<mx:Button label="Reset" click="clickHandler(event)"/>
</mx:HBox>
</mx:VBox>
</mx:Application>
* Click here for the demo shown in this post.^ Click here for the source files for the demo.
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