Question

我有一张X-轴图,显示时间,Y-轴显示物体的价值。时间线值为零秒。我为用户选择时间表提供了途径,用户可以选择一天/周/月/月。因此,在我的图表中,我想显示选定范围的所有数据点,但希望限制在X-轴上显示的日期标签。就Ex而言:如果用户选择一个星期,我想在X-轴上向太阳展示。如果用户选择一天,则希望每3小时贴上标签......

我猜测,如果只有这样,我才有可能根据起始时间(t1)和终点时间(t2)来看待选定的时间范围,我作出决定。是否在弹性日轴上提供了任何抗体反应器以达到这一目的? 还是就如何开展这项工作的其他想法?

Thanks, Ravi

Answer 1

我在试图将日期与我的意愿相提并论时遇到了许多困难:

我更经常地发现,在专门情况下,如:<编码>extend。 <代码>CategoryAxis。你们总是能够产生你所关心和使用这些轴心的各种日期。我不相信这将有利于你的工作,但这是我首先想到的。

这当然需要付出更多的努力,因为你需要定制显示轴心,以便像日期或时间一样,但我认为它有助于处理习俗。

Answer 2

奥凯找到了解决这一问题的办法。类似于上文提及的“@fotomut”。除重写假法外,我从Axis类复制了所有代码。这就是标签产生的地方。我在此采用更新方法,可能不是一个完美的解决办法。

但我在此面临一个问题。出于某种原因,图表和标签倾向于右侧。我无法画出一个图象,把我的习惯性轴比同提供的各类轴体相比较,以更好地解释这一点,因为我仅限于不上任何档案。我正试图解决这一问题,但还没有找到解决办法。

if (!_labelSet)
{

    //I do not need label for each item in my dataprovider.
    //Hence creating a  categoryValues  array with limited labels.
    var chartDP:ArrayCollection = this.dataProvider as ArrayCollection;
    var axisLabels:Array /* of AxisLabel */ = [];
    var labelsArr:Array = [];
    var categoryItems:Array = [];
    var dataMap:Object = {};
    _catMap = {};
    _categoryValues = [];
    _labelsMatchToCategoryValuesByIndex = [];

    if(chartDP.length != 0) {

        for(var indx:int=0; indx<chartDP.length; indx++){

            // Add each item to the map.
            //This is mandatory as it s being used internally to draw the Y-value
            _catMap[chartDP.getItemAt(indx).timeStamp.toString()] = indx;
        }

        var firstItem:Object = chartDP.getItemAt(0);
        var lastItem:Object = chartDP.getItemAt(chartDP.length - 1);
        var incrCounter:int; 

        var timeDiffInMillis:Number = (lastItem.timeStamp) - (firstItem.timeStamp);
        var arrIndx:int=0;
        if(timeDiffInMillis <= MILLISECONDS_IN_HOUR){
            LIMIT_LABEL_CNT = 12;
            INT_LBL_UNITS = "MINUTES";
        }else if(timeDiffInMillis > MILLISECONDS_IN_HOUR && timeDiffInMillis <= MILLISECONDS_IN_DAY){
            LIMIT_LABEL_CNT = 12;
            INT_LBL_UNITS = "HOURS";
        }else if(timeDiffInMillis > MILLISECONDS_IN_DAY && timeDiffInMillis <= MILLISECONDS_IN_WEEK){
            LIMIT_LABEL_CNT = 7;
            INT_LBL_UNITS = "DAYS";
        }else if(timeDiffInMillis > MILLISECONDS_IN_WEEK && timeDiffInMillis <= MILLISECONDS_IN_MONTH){
            LIMIT_LABEL_CNT = 4;
            INT_LBL_UNITS = "WEEKS";
        }else if(timeDiffInMillis > MILLISECONDS_IN_MONTH && timeDiffInMillis <= MILLISECONDS_IN_YEAR) {
            LIMIT_LABEL_CNT = 12;
            INT_LBL_UNITS = "MONTHS"
        }

        if(chartDP.length <= LIMIT_LABEL_CNT)
            incrCounter = 1;
        else
            incrCounter = chartDP.length/LIMIT_LABEL_CNT;
        var i:int=0;
        for(i=0,arrIndx=0; i<chartDP.length; i=i+incrCounter){

            arrIndx = i;
            _categoryValues[arrIndx] = chartDP.getItemAt(i).timeStamp; 
            dataMap[arrIndx] = chartDP.getItemAt(i);

            //There is a very good chance for the incrCounter to omit
            //the last items in the DataProvider.
            if((chartDP.length-i) <= incrCounter){
                arrIndx=arrIndx+incrCounter;
                _categoryValues[arrIndx] = chartDP.getItemAt(chartDP.length-1).timeStamp; 
                dataMap[arrIndx] = chartDP.getItemAt(chartDP.length-1);
            }
        }

        var min:Number = -_padding;
        var max:Number = _categoryValues.length - 1 + _padding;
        var alen:Number = max - min;
        var label:AxisLabel;

        var n:int = _categoryValues.length;
        if (_labelFunction != null)
        {
            var previousValue:Object = null;
            for (i=0; i<n; i++)
            {
                if (_categoryValues[i] == null)
                    continue;

                if(previousValue != null && _categoryValues[i] != null){
                    if(previousValue == _categoryValues[i])
                        continue;
                }
                label = new AxisLabel((i - min) / alen, _categoryValues[i],
                    timeLblFormatFunction(_categoryValues[i], previousValue,
                        this, dataMap[i]));
                _labelsMatchToCategoryValuesByIndex[i] = label;
                axisLabels.push(label);

                previousValue = _categoryValues[i];
            }
        }
        else
        {
            for (i = 0; i < n; i++)
            {
                if (!_categoryValues[i])
                    continue;

                label = new AxisLabel((i - min) / alen, _categoryValues[i],
                    _categoryValues[i].toString());
                _labelsMatchToCategoryValuesByIndex[i] = label;
                axisLabels.push(label);
            }               
        }
    }

    _labelSet = new AxisLabelSet();
    _labelSet.labels = axisLabels;
    _labelSet.accurate = true;
    _labelSet.minorTicks = minorTicks;
    _labelSet.ticks = generateTicks();          
}

友情链接