如何在androidplot条形图中绘制不同颜色的条形图？

Question

1.我的条形图有一个系列。

2.在系列中有10个值。

3.当显示图表时，它有10个条，但所有条形图都是相同的颜色

4.如何画出不同颜色的条纹？

我试着这样做，但它不起作用

class MyBarRenderer extends BarRenderer<MyBarFormatter> {
    public MyBarRenderer(XYPlot plot) {
        super(plot);
    }

    protected BarFormatter getFormatter(int index, XYSeries series) {
        //return getFormatter(series);
        if(index % 2 == 1) {
            return new MyBarFormatter(Color.BLUE, Color.TRANSPARENT);
        } else {
            return new MyBarFormatter(Color.RED, Color.TRANSPARENT);
        }
    }
}

Answer 1

我的代码与您的代码几乎完全相同，并且对我有用。这是我的其余代码：

class MyBarFormatter extends BarFormatter
{
    public MyBarFormatter(int fillColor, int borderColor)
    {
        super(fillColor, borderColor);
    }

    @Override public Class<? extends SeriesRenderer> getRendererClass()
    {
        return MyBarRenderer.class;
    }

    @Override public SeriesRenderer getRendererInstance(XYPlot plot)
    {
        return new MyBarRenderer(plot);
    }
}

class MyBarRenderer extends BarRenderer<MyBarFormatter>
{
    public MyBarRenderer(XYPlot plot)
    {
        super(plot);
    }

    public MyBarFormatter getFormatter(int index, XYSeries series)
    {
        // return getFormatter(series);
        if(index % 2 == 1)
        {
            return new MyBarFormatter(Color.BLUE, Color.TRANSPARENT);
        }
        else
        {
            return new MyBarFormatter(Color.RED, Color.TRANSPARENT);
        }
    }
}

要使用这两个类，我调用以下代码：

// Create an array of y-values to plot:
Number[] values = { 380, 1433, 1965, 3200, 3651, 3215, 3217, 1000, 500, 4300, 3000, 2100 };

// Turn the above array into XYSeries':
XYSeries series1 = new SimpleXYSeries(Arrays.asList(values), SimpleXYSeries.ArrayFormat.Y_VALS_ONLY, "Series1");

// Add a new series to the xyplot:
MyBarFormatter formatter1 = new MyBarFormatter(Color.argb(200, 100, 150, 100), Color.LTGRAY);
mySimpleXYPlot.addSeries(series1, formatter1);

// Give each bar a fixed width
MyBarRenderer renderer = ((MyBarRenderer) mySimpleXYPlot.getRenderer(MyBarRenderer.class));
renderer.setBarWidthStyle(BarRenderer.BarWidthStyle.FIXED_WIDTH);
renderer.setBarWidth(50);

这是它的样子，在两种不同的颜色之间交替出现：

另外，要添加虚线水平线：

YValueMarker yValueMarker = new YValueMarker(2300, "", new XPositionMetric(PixelUtils.dpToPix(0), XLayoutStyle.ABSOLUTE_FROM_RIGHT), Color.BLACK, Color.BLACK);

DashPathEffect dashPathEffect = new DashPathEffect(new float[] { PixelUtils.dpToPix(16), PixelUtils.dpToPix(8) }, 0);

yValueMarker.getLinePaint().setPathEffect(dashPathEffect);

yValueMarker.getLinePaint().setStrokeWidth(PixelUtils.dpToPix(1));

yValueMarker.getLinePaint().setColor(Color.BLACK);

addMarker(yValueMarker);