如果列值减少，则柱形图不更新

Question

如果柱形图中的值增加，柱形图就会更新，一切看起来都很好。但是，当值减少时，列不会更新，并且仍然显示旧值。

private fun drawColumnChart() {
UpdateSuspender.using(lineChart) {
lineChart.theme = R.style.SciChart_Bright_Spark
Collections.addAll(lineChart.renderableSeries, rSeries)
Collections.addAll(lineChart.chartModifiers, sciChartBuilder
.newModifierGroupWithDefaultModifiers().build())
sciChartBuilder.newAnimator(rSeries)
.withWaveTransformation()
.withInterpolator(DecelerateInterpolator())
.withDuration(3000)
.withStartDelay(350)
.start()
}
}
private fun createDataSeries(values: Array<Int>): IXyDataSeries<Int, Int> {
val dataSeries: IXyDataSeries<Int, Int> = sciChartBuilder
.newXyDataSeries(Int::class.javaObjectType, Int::class.javaObjectType).build()
for (i in values.indices) {
dataSeries.append(i, values[i])
}
return dataSeries;
}
private fun createRSeries(values: Array<Int>): FastColumnRenderableSeries {
val dataSeries: IXyDataSeries<Int, Int> = createDataSeries(values)
return sciChartBuilder.newColumnSeries()
.withStrokeStyle(-0xdcdcdd, 0.4f)
.withDataPointWidth(0.5)
.withDataSeries(dataSeries)
.withPaletteProvider(ColumnsPaletteProvider())
.build()
}
private fun createXandYAxis() {
xAxis = sciChartBuilder.newNumericAxis()
.withGrowBy(0.2, 0.2)
.withLabelProvider(YearsLabelProvider())
.build()
yAxis = sciChartBuilder.newNumericAxis()
.withAutoRangeMode(AutoRange.Always).build()
Collections.addAll(lineChart.xAxes, xAxis)
Collections.addAll(lineChart.yAxes, yAxis)
}

• 示例1:DataSet(A=50，B=60，C=20(这些值正确显示

• 示例2：数据集(A=80，B=60，C=20(此数据集中的A从50增加到80：这些值也正确显示。

• 示例3：数据集(A=14，B=60，C=20(注意A从80减少到14，图形不刷新，显示旧的A=80值

更新柱状图的值在环形图的侦听器中更新

segments.forEach(Consumer { segment: PieSegment ->
segment.addIsSelectedChangeListener {
var chartData  = dataCollector(it.value.toLong())
vehicleData[0] = chartData.fuels
vehicleData[1] = chartData.repairs
vehicleData[2] = chartData.tolls
vehicleData[3] = chartData.mis
rSeries = createRSeries(vehicleData)
drawColumnChart()
}
})

感谢阅读：(

Answer 1

代码中的问题是在旧列系列的基础上添加新的列系列，因为在添加新列系列之前不会清除RenderableCollection。我建议在drawColumnChart((中添加对可渲染系列集合的clear((调用。

private fun drawColumnChart() {
UpdateSuspender.using(lineChart) {
animator?.cancel() // cancel if there is animation in progress
lineChart.renderableSeries.clear()
Collections.addAll(lineChart.renderableSeries, rSeries)
animator = sciChartBuilder.newAnimator(rSeries)
.withWaveTransformation()
.withInterpolator(DecelerateInterpolator())
.withDuration(3000)
.withStartDelay(350).build()
animator.start()
}
}

此外，我建议设置一次主题和修饰符，因为如果你把代码留在drawColumnChart((中，你也需要清除修饰符集合+每次重新绘制列时都会重置主题：

private fun createXandYAxis() {
xAxis = sciChartBuilder.newNumericAxis()
.withGrowBy(0.2, 0.2)
.withLabelProvider(YearsLabelProvider())
.build()
yAxis = sciChartBuilder.newNumericAxis()
.withAutoRangeMode(AutoRange.Always).build()
UpdateSuspender.using(lineChart) {
lineChart.theme = R.style.SciChart_Bright_Spark
Collections.addAll(lineChart.xAxes, xAxis)
Collections.addAll(lineChart.yAxes, yAxis)
Collections.addAll(lineChart.chartModifiers, sciChartBuilder
.newModifierGroupWithDefaultModifiers().build())
}
}