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| repositories { maven { url 'https://jitpack.io' } }
dependencies { implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0' }
布局引用 <com.github.mikephil.charting.charts.CombinedChart android:id="@+id/combinedChart" android:layout_width="350dp" android:layout_height="270dp" android:layout_margin="20dp" app:layout_constraintTop_toBottomOf="@+id/toolbar" app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent" />
private lateinit var lineDataSet: LineDataSet//折线数据集 /** 初始化 CombinedChart **/ private fun setupChart() { val chart = binding.combinedChart // 折线数据集 参数设置 lineDataSet = LineDataSet(mutableListOf(Entry(0f, 0f)), "实时曲线").apply { color = ColorTemplate.rgb("1E88E5") lineWidth = 2f setDrawCircles(false) setDrawValues(false) setDrawFilled(true) // 曲线下方填充 mode = LineDataSet.Mode.CUBIC_BEZIER // 平滑曲线 LINEAR axisDependency = YAxis.AxisDependency.LEFT } lineDataSet.setDrawFilled(true) lineDataSet.fillColor = Color.parseColor("#82F689") // 填充颜色 lineDataSet.fillAlpha = 80 // 透明度 0~255
// 曲面折线 redDataSet = LineDataSet(mutableListOf(), "GC 谱图").apply { setDrawHorizontalHighlightIndicator(false) setDrawVerticalHighlightIndicator(false) lineWidth = 0f // 安全 color = Color.TRANSPARENT // 即使透明也不影响 mode = LineDataSet.Mode.LINEAR // 不要贝塞尔
setCircleColor(Color.RED) // 圆点颜色为红色 setDrawCircleHole(false) // 圆点不留白 setDrawCircles(true) // 不画圆点 setDrawFilled(false) // 曲线下方填充 fillColor = Color.TRANSPARENT }
val lineData = LineData(redDataSet,lineDataSet)
// 柱状数据集(初始化为空) barDataSet = BarDataSet(mutableListOf(), "目标气体峰").apply { color = Color.RED } val barData = BarData(barDataSet).apply { barWidth = 0.8f }
// CombinedData val combinedData = CombinedData().apply { setData(lineData) setData(barData) } chart.data = combinedData
// 限制最大缩放比例 chart.viewPortHandler.setMaximumScaleX(Float.MAX_VALUE) // X轴无限放大 chart.viewPortHandler.setMinimumScaleX(0f) // 无限缩小(到很小) chart.viewPortHandler.setMaximumScaleY(Float.MAX_VALUE) // Y轴无限放大 chart.viewPortHandler.setMinimumScaleY(0f) // 无限缩小
// X轴设置 chart.xAxis.apply { position = XAxis.XAxisPosition.BOTTOM granularity = 1f axisMinimum = 0f }
// Y轴设置 // chart.axisLeft.apply { // axisMinimum = 0f // valueFormatter = object : ValueFormatter() { // override fun getFormattedValue(value: Float): String = "${value.toInt()} mV" // } // setAxisMinValue(0f)//强制y轴最小值 // } chart.axisLeft.apply { axisMinimum = 0f // 下限固定 0(PID 不会为负) spaceTop = 80f // 上方预留 20%,防止贴顶 spaceBottom = 5f // 下方预留一点更美观 setDrawGridLines(true) setDrawZeroLine(false)
// Y 轴单位 valueFormatter = object : ValueFormatter() { override fun getFormattedValue(value: Float): String = "${value.toInt()} mV" } }
chart.axisRight.isEnabled = false
// 缩放 + 拖动 + 图表一次最多能看到多少 X 点(宽度限制) chart.setScaleEnabled(true) chart.setPinchZoom(true) chart.setVisibleXRangeMaximum(maxVisiblePoints)
chart.description.isEnabled = false
//替换默认的renderer为自定义的SampleHighlightRenderer,画高亮区间 val highlightPaint = Paint().apply { style = Paint.Style.FILL color = Color.parseColor("#5533B5E5") // 半透明蓝色 } val renderer = SampleHighlightRenderer(binding.combinedChart, binding.combinedChart.viewPortHandler, highlightPaint) binding.combinedChart.renderer = renderer
//设置高亮的mark // val marker = MyMarkerView(this) // marker.chartView = binding.combinedChart // binding.combinedChart.marker = marker // // chart.isHighlightPerTapEnabled = true // chart.isHighlightPerDragEnabled = true chart.invalidate() }
private fun addGCPoint(value: Float) { val chart = binding.combinedChart val entry = Entry(xIndex, value)
xIndex += 1f
lineDataSet.addEntry(entry) if(xIndex == 10f || xIndex == 20f){ redDataSet.addEntry(entry) }
chart.data.lineData.notifyDataChanged() chart.data.notifyDataChanged() chart.notifyDataSetChanged()
// 固定显示最近 maxVisiblePoints 个点 if (lineDataSet.entryCount > maxVisiblePoints) { chart.setVisibleXRangeMaximum(maxVisiblePoints) chart.moveViewToX(lineDataSet.entryCount - maxVisiblePoints) } else { chart.moveViewToX(0f) }
chart.invalidate()
}
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