Androidplot 使用“FastLineAndPointRenderer”时，散点图图例图标为空`

当我使用常规的

LineAndPointRenderer

时，我所有的图例图标都会正常显示

//works but is slow
private LineAndPointFormatter getScatterPlotFormatter() {
    LineAndPointFormatter formatter = new LineAndPointFormatter(
            Color.TRANSPARENT,
            Color.argb(0xFF, mRandom.nextInt(0xFF), mRandom.nextInt(0xFF), mRandom.nextInt(0xFF)),
            null,
            null
    );
    formatter.getVertexPaint().setStrokeWidth(getContext().getResources().getDimension(R.dimen.chart_vertex_size));
    return formatter;
}

建议改用

FastLineAndPointRenderer

，但当我这样做时，图例图标显示为空白。这只会影响我的散点图

//does not show proper legend icon
private LineAndPointFormatter getScatterPlotFormatter() {
    FastLineAndPointRenderer.Formatter formatter = new FastLineAndPointRenderer.Formatter(
            Color.TRANSPARENT,
            Color.argb(0xFF, mRandom.nextInt(0xFF), mRandom.nextInt(0xFF), mRandom.nextInt(0xFF)),
            null
    );
    formatter.getVertexPaint().setStrokeWidth(getContext().getResources().getDimension(R.dimen.chart_vertex_size));
    return formatter;
}

---

也许我错过了一些更简单的方法。如果是，请发布另一个答案。否则，扩展该类并添加代码以绘制顶点画布对我来说很有用：

public static class FastScatterChartRenderer extends FastLineAndPointRenderer {
    public FastScatterChartRenderer(XYPlot plot) {
        super(plot);
    }

    @Override
    protected void doDrawLegendIcon(Canvas canvas,
                                    RectF rect,
                                    Formatter formatter) {
        super.doDrawLegendIcon(canvas, rect, formatter);
        if(formatter.hasVertexPaint()) {
            canvas.drawPoint(rect.centerX(), rect.centerY(), formatter.getVertexPaint());
        }
    }
}

@NonNull
private LineAndPointFormatter getScatterPlotFormatter() {
    FastLineAndPointRenderer.Formatter formatter = new FastLineAndPointRenderer.Formatter(
            null,
            Color.argb(0xFF, mRandom.nextInt(0xFF), mRandom.nextInt(0xFF), mRandom.nextInt(0xFF)),
            null
    ){
        @Override
        public Class<? extends SeriesRenderer> getRendererClass() {
            return FastScatterChartRenderer.class;
        }

        @Override
        public SeriesRenderer doGetRendererInstance(XYPlot plot) {
            return new FastScatterChartRenderer(plot);
        }
    };
    formatter.getVertexPaint().setStrokeWidth(getContext().getResources().getDimension(R.dimen.chart_vertex_size));
    return formatter;
}

公共静态类FastScatterChartRenderer扩展了FastLineAndPointRenderer{
公共FastScatterChartRenderer（XYPlot）{
超级（情节）；
}
@凌驾
受保护的void doDrawLegendIcon（画布，
rectfrect，
格式化程序（格式化程序）{
super.doDrawLegendIcon（canvas、rect、formatter）；
if（formatter.hasVertexPaint（））{
drawPoint（rect.centerX（），rect.centerY（），formatter.getVertexPaint（））；
}
}
}
@非空
private LineAndPointFormatter getScatterPlotFormatter（）{
FastLineAndPointRenderer.Formatter Formatter=新的FastLineAndPointRenderer.Formatter(
无效的
Color.argb（0xFF，mRandom.nextInt（0xFF），mRandom.nextInt（0xFF），mRandom.nextInt（0xFF）），
无效的
){
@凌驾
public类在
FastLineAndPointRenderer
实现中看起来像个bug。我创建它是为了跟踪它-将在下一个版本中修复。您上面的方法看起来是一个不错的解决方案。