在 Graphview 库中使用日期 [英] Using dates with the Graphview library

问题描述

我正在使用 GraphView 库(请参阅:https://github.com/jjoe64/GraphView 或 http://www.jjoe64.com/p/graphview-library.html)

I'm using GraphView library (see: https://github.com/jjoe64/GraphView or http://www.jjoe64.com/p/graphview-library.html)

但我想为 X-as 使用日期/时间.有没有人知道一种简单的方法来实现这一目标，或者任何人都可以将我推向正确的方向?

But I would like to use Date/Time for the X-as. Does anyone knows a easy way to accomplish this or can anyone push me in the right direction?

推荐答案

GraphView 是一个很好用的库，我发现它也是最简单的.执行此操作的第一步是在 GraphView.java 的 GraphViewData 类中添加一个字符串变量.像这样:

GraphView is a great library to use, i find it the easiest as well. The first step in doing this would be to add a String Variable in the GraphViewData Class within GraphView.java. Like So:

static public class GraphViewData {
    public final double valueX;
    public final double valueY;
    public final String valueDate;

    public GraphViewData(double valueX, double valueY,String valueDate) {
        super();
        this.valueX = valueX;
        this.valueY = valueY;
        this.valueDate = valueDate;
    }
}

当您在创建 GraphView Graph 时创建 GraphViewData 对象时，您需要以字符串形式添加日期数据(以及 X 和 Y).

When you create your GraphViewData object when creating a GraphView Graph, you will need to add the date data in string form (along with the X and Y).

假设您的图表中有 80 个数据点(索引 0 - 79).GraphView 中有一个方法负责生成和返回水平标签，我相信它叫做 generateHorLabels.不是仅仅返回 X 值 (0-79)，而是使用 X 值从 GraphData 对象获取字符串.

Lets say you have 80 data points in your graph (index 0 - 79). There is a method within GraphView that is responsible for generating and returning the horizontal labels, i believe its called generateHorLabels. Instead of just returning the X Value (0-79), Use the X value to get the String from the GraphData object.

在您现在拥有的代码中，它应该在 for 循环中具有以下内容

In the code you have now, it should have the following in a for loop

labels[i] = formatLabel(min + ((max-min)*i/numLabels), true);

你可以做这样的事情，而不是上面的.

instead of the above, you could do something like this.

Double temp =  Double.valueOf(formatLabel(min + ((max-min)*i/numLabels), true));
int rounded =(int)Math.round(temp); 
labels[i] = values[rounded].valueDate;

希望这有帮助！

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