Question

当我以编程方式创建一个没有系列的PlotChart并添加具有自身缩放和verticalAxes的系列（以及渲染但不是行为错误所必需的系列）时，轴和数据显示，但默认轴控制所有缩放和另一个轴是错误的。因此，y值的大小与它们的相关轴不相对应，并且混合系列具有完全不同的数量级，除了最大的以外都是无法区分的底值。我不能将默认的垂直轴归零，因为它会获得空指针错误。 [单击图表上的任意位置以添加下一个系列。]

package
{
/*
* Attempt to dynamically create graph w/ varying series. Having difficulty getting axis to render correctly based
* on sets of series. Having trouble getting more than one series. I can't munge the yValue property because in my
* actual code all of the data elements are instances of the same class with properties akin to series, xValue, and yValue.
*
*/
import flash.events.MouseEvent;

import mx.charts.AxisRenderer;
import mx.charts.DateTimeAxis;
import mx.charts.LinearAxis;
import mx.charts.PlotChart;
import mx.charts.chartClasses.Series;
import mx.charts.events.ChartEvent;
import mx.charts.series.PlotSeries;
import mx.collections.ArrayCollection;

public class GraphSample extends PlotChart
{
    public function GraphSample()
    {
        super();
        this.selectionMode = "single";
        this.percentWidth = 80;
        this.series = new Array();
        this.verticalAxisRenderers = new Array();
        this.showDataTips = true;
    }

    protected override function createChildren():void {
        super.createChildren();

        // Create the horizontal axis
        var hAxis:DateTimeAxis = new DateTimeAxis();
        hAxis.dataUnits = "days";
        this.horizontalAxis = hAxis; 

        // NOTE: I do not want an automatically created verticalAxis, but can't seem to avoid it
                    // Add vertical axis renderer
        var axis:AxisRenderer = new AxisRenderer();
        axis.axis = this.verticalAxis;
        axis.horizontal = false;
        axis.setStyle("showLabels", true);
        axis.setStyle("showLine", true);
        this.verticalAxisRenderers.push(axis);
        this.verticalAxisRenderers = this.verticalAxisRenderers;

        this.addEventListener(ChartEvent.CHART_CLICK, addSeries);
    }

    private var seriesColors:Array = [0x888888, 0xFFC833, 0xFF6433, 0xE73399, 
        0x8133CC, 0x346B9B, 0x33C399, 0x98F133];
    private var seriesColorCursor:int = 0;

    private const ONE_DAY:Number = (1000 * 60 * 60 * 24);
    private const TODAY:Date = new Date();

    private function addSeries(event:MouseEvent):void {
        var dimension:Object = newDimension();

        var series:Series = new PlotSeries(); 
        series.displayName = dimension.name;
        series.dataFunction = genericFieldRetriever;
        series.setStyle("fill", seriesColors[seriesColorCursor++]);
        if (seriesColorCursor > seriesColors.length) seriesColorCursor %= seriesColors.length;

        series.dataProvider = dimension.elements;
        this.series.push(series);


        var seriesAxis:LinearAxis = new LinearAxis();
        series.setAxis("verticalAxis", seriesAxis);
        var min:Number = Number.MAX_VALUE, max:Number = 0;
        for each (var ele:Object in series.dataProvider) {
            if (ele.value > max) max = ele.value;
            if (ele.value < min) min = ele.value;
        }
        seriesAxis.minimum = min * 0.85;
        seriesAxis.maximum = max * 1.2;
        seriesAxis.displayName = series.displayName;
        seriesAxis.title = series.displayName;

        // Add vertical axis renderer
        var axis:AxisRenderer = new AxisRenderer();
        axis.axis = seriesAxis;
        axis.horizontal = false;
        axis.setStyle("color", series.getStyle("fill"));
        axis.setStyle("showLabels", true);
        axis.setStyle("showLine", true);
        this.verticalAxisRenderers.push(axis);
        this.verticalAxisRenderers = this.verticalAxisRenderers;
        // also strokes?



        // http://www.flexdeveloper.eu/forums/flex-charting/creating-linecolumn-series-dynamically/
        this.series = this.series;
        this.invalidateSeriesStyles();

        if (names.length == 0) this.removeEventListener(ChartEvent.CHART_CLICK, addSeries);
    }

    /**
     * A fake of the server data retrieval mechanism. 
     * @return wrapper w/ name and elements set where each element has a data and value.
     */
    private function newDimension():Object {
        var result:Object = new Object();
        result['name'] = names.shift();
        var elements:ArrayCollection = new ArrayCollection();
        var thisBase:int = base.shift();
        var thisMax:int = maxAdd.shift();
        for (var date:Date = new Date(TODAY.getTime() - 10 * ONE_DAY); date.getTime() <= TODAY.getTime(); date = new Date(date.getTime() + ONE_DAY)) {
            var element:Object = new Object();
            element['date'] = date;
            element['value'] = thisBase + Math.random() * thisMax;
            elements.addItem(element);
        }
        result['elements'] = elements;
        return result;
    }
    private var names:Array = ['fat', 'carbs', 'steps', 'walking miles', 'pounds', 'cycling miles', 'running miles', 'skiing hours', 'lifting mins'];
    private var base:Array = [0, 20, 1000, 0, 100, 0, 0, 0, 0];
    private var maxAdd:Array = [100, 200, 9000, 4, 200, 40, 8, 3, 75];


    private function genericFieldRetriever(series:Series, item:Object, fieldName:String):Object {
          if(fieldName == 'yValue')
              return(item.value);
          else if(fieldName == "xValue")
              return(item.date);
          else
              return null;
    }     

}
}

Answer 1

问题在于

行

 series.setAxis("verticalAxis", seriesAxis);

这不等于

series.verticalAxis = seriesAxis;

一旦我改变了它，一切都运行得很好，但它无法处理抽象的Series类b / c，该类没有verticalAxis的setter。

在PlotChart中缩放多个轴

1 个答案: