findDataPoints() 中的 Flex PlotChart 缩放错误

发布于 2024-12-03 11:57:25 字数 999 浏览 1 评论 0原文

我发现了这个很棒的教程，介绍如何通过在折线图中绘制矩形来放大图表来放大图表（http://blog.ninjacaptain.com/2010/03/flex-chart-zoom-window/），但我正在尝试将其应用于相反，我在尝试获取显示以下错误的 DataTips 时遇到问题：

TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at mx.charts.series::PlotSeries/findDataPoints()[E:\dev\4.5.1\frameworks\projects\charts\src\mx\charts\series\PlotSeries.as:961]
    at mx.charts.chartClasses::ChartBase/findDataPoints()[E:\dev\4.5.1\frameworks\projects\charts\src\mx\charts\chartClasses\ChartBase.as:2069]
    at mx.charts.chartClasses::ChartBase/mouseClickHandler()[E:\dev\4.5.1\frameworks\projects\charts\src\mx\charts\chartClasses\ChartBase.as:4823]

链接提到了有关扩展 LineChartSeries 并覆盖 findDataPoints() 函数，但在尝试对扩展 PlotSeries.as 执行相同操作后，sortOnXField 似乎未定义，我无权访问 PlotSeries.as，因为它位于 swc 中。

有没有人尝试将以下内容应用于 PlotChart 并显示数据提示？ findDataPoints() 中的覆盖函数是什么？

谢谢

原文

I came across this great tutorial on how to zoom into a chart by drawing a rectangle in a LineChart to zoom into it (http://blog.ninjacaptain.com/2010/03/flex-chart-zoom-window/) but i'm trying to apply it to a PlotChart instead and i'm having issues trying to get the DataTips showing with the following error:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at mx.charts.series::PlotSeries/findDataPoints()[E:\dev\4.5.1\frameworks\projects\charts\src\mx\charts\series\PlotSeries.as:961]
    at mx.charts.chartClasses::ChartBase/findDataPoints()[E:\dev\4.5.1\frameworks\projects\charts\src\mx\charts\chartClasses\ChartBase.as:2069]
    at mx.charts.chartClasses::ChartBase/mouseClickHandler()[E:\dev\4.5.1\frameworks\projects\charts\src\mx\charts\chartClasses\ChartBase.as:4823]

The link mentioned about extending the LineChartSeries and override the findDataPoints() function, but after trying to doing the same for extending PlotSeries.as, sortOnXField seems to be undefined and I don't have access to the PlotSeries.as since it is in a swc.

Has anyone tried applying the following to a PlotChart instead and got the DataTips to show? What was the override function in the findDataPoints()?

Thanks

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三人与歌 2024-12-10 11:57:25

几天前我在 PieSeries 上遇到了同样的问题。

我还没有找到为什么“filterDataPoints”函数中“_renderData.filteredCache”为空，但同时我已经解决了以这种方式扩展 PieSeries 类的问题：

package com.eque.report.model {

import mx.charts.series.PieSeries;

public class MyPieSeries extends PieSeries {

    public function MyPieSeries () {
        super();
    }

    /**
     * 'findDataPoints' function has been overriden in order to prevent
     * '_renderData.filteredCache' is null.
     */
    override public function findDataPoints(x:Number, y:Number, sensitivity:Number):Array {
        if (renderData.filteredCache == null) {
            renderData.filteredCache = [];
        }
        return super.findDataPoints(x, y, sensitivity);
    }

}
}

我希望它可以帮助您

Some days ago I had the same problem with PieSeries.

I have not found yet why '_renderData.filteredCache' is null in 'filterDataPoints' function, but meanwhile I have resolved the problem extending PieSeries Class this way:

package com.eque.report.model {

import mx.charts.series.PieSeries;

public class MyPieSeries extends PieSeries {

    public function MyPieSeries () {
        super();
    }

    /**
     * 'findDataPoints' function has been overriden in order to prevent
     * '_renderData.filteredCache' is null.
     */
    override public function findDataPoints(x:Number, y:Number, sensitivity:Number):Array {
        if (renderData.filteredCache == null) {
            renderData.filteredCache = [];
        }
        return super.findDataPoints(x, y, sensitivity);
    }

}
}

I hope it could help you

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