Question

我正在开展一个需要绘制数据的项目。我在Windows 7 64位PC上使用Android Studio 5.2.0和AChartEngine 1.2.0。我对y标签的工程格式感兴趣，例如2.3E6 .. 我没有任何成功就研究过我能做到的事情。我希望1,3,0,1和1为最小整数位数，最大整数位数，最小分数位数，最大小数位数和否。指数部分中的数字分别为。另外，指数必须是3的多重。

这是我的LineGraph类：

public class LineGraph
{
    public Intent getIntent(Context context)
    {
        int size = ( int ) Math.pow(2, 10);
        double start = 0;
        double end = 2 * Math.PI;
        double inc = (end - start) / (size - 1);
        double[] x = new double[size];
        double[] y = new double[size];

        XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
        TimeSeries series = new TimeSeries("Sin * Cos");
        for ( int i = 0; i < size; i++ )
        {
            x[i] = start + i * inc;
            y[i] = 10000 * Math.sin(x[i]) * Math.cos(x[i]);
            series.add(x[i], y[i]);
        }

        dataset.addSeries(series);
        XYSeriesRenderer ren = new XYSeriesRenderer();

        // XYSeriesRenderer properties
        ren.setColor(Color.RED);
        ren.setFillPoints(true);
        ren.setDisplayBoundingPoints(false);
        ren.setFillPoints(true);
        ren.setLineWidth(2f);

        // XYMultipleSeriesRenderer properties
        XYMultipleSeriesRenderer mRen = new XYMultipleSeriesRenderer();
        mRen.setAntialiasing(true);
        mRen.setMargins(new int[] { 10, 80, 10, 10 });
        mRen.setShowGrid(true);
        mRen.setApplyBackgroundColor(true);
        mRen.setBackgroundColor(Color.LTGRAY);
        mRen.setGridColor(Color.WHITE);
        mRen.setLabelsTextSize(20f);
        mRen.setYLabelsVerticalPadding(-5f);
        mRen.setYLabelsPadding(40);
        mRen.setShowLegend(false);
        mRen.setXLabels(5);
        mRen.setYLabels(10);

        // Number format
        DecimalFormat noFormat = new DecimalFormat("##0.##E0");
        noFormat.setMinimumIntegerDigits(1);
        noFormat.setMaximumIntegerDigits(3);
        noFormat.setMinimumFractionDigits(0);
        noFormat.setMaximumFractionDigits(2);
        mRen.setYLabelFormat(noFormat, 0);
        mRen.addSeriesRenderer(renderer);

        // Construct and return the intent.
        Intent intent = ChartFactory.getLineChartIntent(context, dataset, mRen, "Line Graph");
        return intent;
    }
}

这是我的MainActivity：

public class MainActivity extends ActionBarActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        int id = item.getItemId();
        if ( id == R.id.action_settings )
        { return true; }

        return super.onOptionsItemSelected(item);
    }

    public void lineGraphHandler(View view)
    {
        LineGraph lineGraph = new LineGraph();
        Intent lineIntent = lineGraph.getIntent(this);
        startActivity(lineIntent);
    }
}

这是我的activity_main.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context="ramin.graphtutorial.graph.MainActivity">

    <Button
        android:id="@+id/button_linegraph"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:onClick="lineGraphHandler"
        android:text="@string/button_line_graph_text"/>

</RelativeLayout>

最后，这是我的manifest.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest
    package="ramin.graphtutorial.graph"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <application
        android:allowBackup="true"
        android:allowClearUserData="true"
        android:allowTaskReparenting="true"
        android:hardwareAccelerated="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme">
        <activity
            android:name="ramin.graphtutorial.graph.MainActivity"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>

        <activity android:name="org.achartengine.GraphicalActivity"/>
    </application>
</manifest>

当我将noFormat的格式方法应用于单个double值时，它可以正常工作，但不能用于映射y标签。对于后者，我会做以下事情;

XYMultipleSeriesRenderer mRen = new XYMultipleSeriesRenderer();
XYSeriesRenderer ren = new XYSeriesRenderer ();
mRen.addSeriesRenderer(ren);
int noOfYLabels = 5;
mRen.setYLabels( noOfYLabels );
mRen.setYLabelFormat( noFormat, 0 );

但是我只得到三个零，即沿着y轴的所有值都是000，大于1000。我还尝试通过以下代码片段手动设置y值文本标签：

Double[] ylabels = mRen.getYTextLabelLocations(0);
mRen.setYLabels( 0 );
for ( int i = 0; i < noOfYLabels; i++ )
{ mRen.addYTextLabel( ylabels[ i ], noFormat.format( ylabels[ i ] ) ); }

然后我在数组yLabels中得到索引超出范围。有人可以帮我解决这个问题吗？ PS：我之前问了这个问题，但没有得到任何答案。也许问题不够明确。先感谢您。拉敏。

Answer 1

尝试这样的事情

    private LinearLayout chartLayout;
    private GraphicalView mChart;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        showlineGraph( );
    }

    public void showlineGraph()
    {
        chartLayout=    (LinearLayout) findViewById(R.id.graphHolder);
//      LineGraph lineGraph = new LineGraph();

        int size = (int) Math.pow(2, 10);
        double start = 0;
        double end = 2 * Math.PI;
        double inc = (end - start) / (size - 1);
        double[] x = new double[size];
        double[] y = new double[size];

        XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
        TimeSeries series = new TimeSeries("Sin * Cos");
        for(int i = 0; i < size; i++)
        {
            x[i] = start + i * inc;
            y[i] = 1000 * Math.sin(x[i]) * Math.cos(x[i]);
            series.add(x[i], y[i]);
        }

        dataset.addSeries(series);
        XYSeriesRenderer ren = new XYSeriesRenderer();

        // XYSeriesRenderer properties
        ren.setColor(Color.RED);
        ren.setFillPoints(true);
        ren.setDisplayBoundingPoints(false);
        ren.setFillPoints(true);
        ren.setLineWidth(2f);

        // XYMultipleSeriesRenderer properties
        XYMultipleSeriesRenderer mRen = new XYMultipleSeriesRenderer();
        mRen.setAntialiasing(true);
        mRen.setMargins(new int[] { 10, 80, 10, 10 });
        mRen.setShowGrid(true);
        mRen.setApplyBackgroundColor(true);
        mRen.setBackgroundColor(Color.LTGRAY);
        mRen.setGridColor(Color.WHITE);
        mRen.setLabelsTextSize(20f);
        mRen.setYLabelsVerticalPadding(-5f);
        mRen.setYLabelsPadding(40);
        mRen.setShowLegend(false);
        mRen.setXLabels(5);
        mRen.setYLabels(10);

        // Number format
        DecimalFormat noFormat = new DecimalFormat("##0.##E0");
        noFormat.setMinimumIntegerDigits(1);
        noFormat.setMaximumIntegerDigits(3);
        noFormat.setMinimumFractionDigits(0);
        noFormat.setMaximumFractionDigits(2);
        mRen.setYLabelFormat(noFormat, 0);
        mRen.addSeriesRenderer(ren);

        // Construct and return the intent.
        view = ChartFactory.getLineChartView(this, dataset, mRen);
        chartLayout.addView(view);
    }

工程AChartEngine for Android中y轴值的格式

1 个答案: