Android GraphView 4.x - 条形图不适合

Question

我在Android应用中使用了4.x版的GraphView。我有一个带有7个数据点的条形图，第一个和最后一个条被切断。

这是我的代码

private static final String[] WEEK_DAYS = {"Sun", "Mon", "Tue", "Wed",  "Thu", "Fri", "Sat"};

private void showChartData() {

    ChartData[] data = new ChartData[7];
    for (int x = 0; x < 7; x++) {
        data[x] = new ChartData();
    }
    data[0].setEnrollmentCount(2);
    data[1].setEnrollmentCount(4);
    data[2].setEnrollmentCount(6);
    data[3].setEnrollmentCount(8);
    data[4].setEnrollmentCount(10);
    data[5].setEnrollmentCount(12);
    data[6].setEnrollmentCount(14);

    chartHolder.removeAllViews();

    DataPoint[] graphViewData = new DataPoint[7];

    for (int i = 0; i < data.length; i++) {
        graphViewData[i] = new DataPoint(i,
                data[i].getEnrollmentCount());
    }

    BarGraphSeries<DataPoint> series = new BarGraphSeries<DataPoint>(graphViewData);
    series.setColor(getResources().getColor(R.color.custom_red));

    GraphView graphView = new GraphView(this);
    graphView.addSeries(series); // data
    graphView.setBackgroundColor(Color.WHITE);
    graphView.setTitle("Sales This Week");

    StaticLabelsFormatter staticLabelsFormatter = new StaticLabelsFormatter(graphView);
    staticLabelsFormatter.setHorizontalLabels(WEEK_DAYS);
    graphView.getGridLabelRenderer().setLabelFormatter(staticLabelsFormatter);          
    graphView.getGridLabelRenderer().setGridStyle(GridStyle.NONE);
    chartHolder.addView(graphView);
}

这是条形图的屏幕截图

Answer 1

看来v3.1.3和4.0.0之间发生了很多变化，无论如何也是这个变化。库中v3的BarGraph特定逻辑将视口上下移动半个xInterval，因此屏幕上第一个和最后一个条目的全宽度条似乎已被删除。无论如何，它很容易编码，例如。

double xInterval=1.0;
graphView.getViewport().setXAxisBoundsManual(true);
if (dataSeries instanceof BarGraphSeries ) {
    // Shunt the viewport, per v3.1.3 to show the full width of the first and last bars. 
    graphView.getViewport().setMinX(dataSeries.getLowestValueX() - (xInterval/2.0));
    graphView.getViewport().setMaxX(dataSeries.getHighestValueX() + (xInterval/2.0));
} else {
    graphView.getViewport().setMinX(dataSeries.getLowestValueX() );
    graphView.getViewport().setMaxX(dataSeries.getHighestValueX());
}