MPAndroidChart组合——图表功能 原创

功能介绍：
MpChart是一个强大的图表视图，主要提供多种多样的图表视图，包括折线图，曲线图，柱形图，饼状图，K线图、雷达图、气泡图。适用于各种统计后的数据以视觉直观的方式呈现。

使用场景：
主要用于业务数据汇总，例如销售数据走势图，股价走势图等场景中使用，方便开发者快速实现图表UI。

图表示例如下：

组件功能描述
Ohos-MPChart是一个强大的图表视图，主要提供多种多样的图表视图，包括折线图，曲线图，柱形图，饼状图，K线图等等，具体功能模块如下：

使用方法：
图表一：折线图

第一步：导入LineChart自定义组件：

import { LineChart } from '@ohos/ohos_mpchart'

第二步：初始化数据

private aboutToAppear() {
    this.lineData = this.initCurveData(45, 100);
    this.topAxis.setLabelCount(5, false);
    this.topAxis.setPosition(XAxisPosition.TOP);
    this.topAxis.setAxisMinimum(0);
    this.topAxis.setAxisMaximum(50);
    this.bottomAxis.setLabelCount(5, false);
    this.bottomAxis.setPosition(XAxisPosition.BOTTOM);
    this.bottomAxis.setAxisMinimum(0);
    this.bottomAxis.setAxisMaximum(50);
    this.bottomAxis.setDrawAxisLine(false);
    this.bottomAxis.setDrawLabels(false)

    this.leftAxis = new YAxis(AxisDependency.LEFT);
    this.leftAxis.setLabelCount(7, false);
    this.leftAxis.setPosition(YAxisLabelPosition.OUTSIDE_CHART);
    this.leftAxis.setSpaceTop(15);
    this.leftAxis.setAxisMinimum(-50);
    this.leftAxis.setAxisMaximum(200);
    this.leftAxis.enableGridDashedLine(5,5,0)

    this.rightAxis = new YAxis(AxisDependency.RIGHT);
    this.rightAxis.setDrawGridLines(false);
    this.rightAxis.setLabelCount(7, false);
    this.rightAxis.setSpaceTop(11);
    this.rightAxis.setAxisMinimum(-50); // this replaces setStartAtZero(true)
    this.rightAxis.setAxisMaximum(200);
    this.rightAxis.setDrawAxisLine(false);

    var upperLimtLine:LimitLine= new LimitLine(150, "Upper Limit");
    upperLimtLine.setLineWidth(4);
    upperLimtLine.enableDashedLine(10, 10, 0);
    upperLimtLine.setLabelPosition(LimitLabelPosition.RIGHT_TOP);
    upperLimtLine.setTextSize(10);

    var lowerLimtLine:LimitLine= new LimitLine(-30, "Lower Limit");
    lowerLimtLine.setLineWidth(4);
    lowerLimtLine.enableDashedLine(5, 5, 0);
    lowerLimtLine.setLabelPosition(LimitLabelPosition.RIGHT_BOTTOM);
    lowerLimtLine.setTextSize(10);

    this.leftAxis.setDrawLimitLinesBehindData(true);
    this.leftAxis.addLimitLine(upperLimtLine);
    this.leftAxis.addLimitLine(lowerLimtLine);
  }
  private initCurveData(count: number, range: number): LineData {

    let values = new JArrayList<EntryOhos>();

    for (let i = 0; i < 50; i++) {
      let val: number = Math.random() * 180 - 30;
      values.add(new EntryOhos(i, val));
    }

    let gradientFillColor = new Array<ColorStop>();
    gradientFillColor.push(['#ffff0000', 0.1])
    gradientFillColor.push(['#00ff0000', 1.0])

    let dataSet = new JArrayList<ILineDataSet>();

    let set1 = new LineDataSet(values, "DataSet 1");
    set1.setDrawFilled(true);
    set1.enableDashedLine(10,5,0)
    set1.setMode(Mode.LINEAR);
    set1.setGradientFillColor(gradientFillColor)
    set1.setColorByColor(Color.Black);
    set1.setLineWidth(1)
    set1.setDrawCircles(true);
    set1.setCircleColor(Color.Black);
    set1.setCircleRadius(2);
    set1.setCircleHoleRadius(1)
    set1.setCircleHoleColor(Color.Green)
    set1.setDrawCircleHole(false)
    dataSet.add(set1);

    return new LineData(dataSet)
  }

第三步：添加数据到自定义曲线图表组件

build() {
    Stack({ alignContent: Alignment.TopStart }) {
       LineChart({
        topAxis: this.topAxis,
        bottomAxis: this.bottomAxis,
        width: this.width,
        height: this.height,
        minOffset: this.minOffset,
        leftAxis: this.leftAxis,
        rightAxis: this.rightAxis,
        lineData: this.lineData,
      })
    }
  }

图表二：柱状图

第一步：导入BarChart自定义组件：

import {BarChart,BarChartModel} from '@ohos/ohos_mpchart'

第二步：初始化数据

@State model:BarChartModel = new BarChartModel();
  width: number = 350; //表的宽度
  height: number = 500; //表的高度
  minOffset: number = 15; //X轴线偏移量
  leftAxis: YAxis = null;
  rightAxis: YAxis = null;
  bottomAxis: XAxis = new XAxis();

  private aboutToAppear(){
    this.leftAxis = new YAxis(AxisDependency.LEFT);
    this.leftAxis.setLabelCount(6, false);
    this.leftAxis.setPosition(YAxisLabelPosition.OUTSIDE_CHART);
    this.leftAxis.setSpaceTop(15);
    this.leftAxis.setAxisMinimum(0);
    this.leftAxis.setAxisMaximum(110);
    this.leftAxis.enableGridDashedLine(10,10,0)

    this.rightAxis = new YAxis(AxisDependency.RIGHT);
    this.rightAxis.setDrawGridLines(false);
    this.rightAxis.setLabelCount(6, false);
    this.rightAxis.setSpaceTop(11);
    this.rightAxis.setAxisMinimum(0); // this replaces setStartAtZero(true)
    this.rightAxis.setAxisMaximum(110);

    this.bottomAxis.setLabelCount(5, false);
    this.bottomAxis.setPosition(XAxisPosition.BOTTOM);
    this.bottomAxis.setAxisMinimum(0);
    this.bottomAxis.setAxisMaximum(10);

    this.setData(this.bottomAxis.getAxisMaximum(),this.leftAxis.getAxisMaximum())

    this.model.width = this.width;
    this.model.height = this.height;
    this.model.init();
    this.model.setDrawBarShadow(false);
    this.model.setDrawValueAboveBar(true);
    this.model.getDescription().setEnabled(false);
    this.model.setMaxVisibleValueCount(60);
    this.model.setLeftYAxis(this.leftAxis);
    this.model.setRightYAxis(this.rightAxis);
    this.model.setXAxis(this.bottomAxis)
    this.model.mRenderer.initBuffers();
    this.model.prepareMatrixValuePx();
  }
  private setData(count: number, range: number) {
    let groupSpace: number = 0.08;
    let barSpace: number = 0.03; // x4 DataSet
    let barWidth: number = 0.2; // x4 DataSet
    let groupCount: number = count + 1;
    let startYear: number = 1980;
    let endYear: number = startYear + groupCount;
    let values1:JArrayList<BarEntry> = new JArrayList<BarEntry>();
    let values2:JArrayList<BarEntry> = new JArrayList<BarEntry>();
    let values3:JArrayList<BarEntry> = new JArrayList<BarEntry>();
    let values4:JArrayList<BarEntry> = new JArrayList<BarEntry>();
    let randomMultiplier: number = range;
    for (let i = startYear; i < endYear; i++) {
      values1.add(new BarEntry(i, (Math.random() * randomMultiplier)))
      values2.add(new BarEntry(i, (Math.random() * randomMultiplier)))
      values3.add(new BarEntry(i, (Math.random() * randomMultiplier)))
      values4.add(new BarEntry(i, (Math.random() * randomMultiplier)))
    }
    let set1: BarDataSet,set2: BarDataSet,set3: BarDataSet,set4: BarDataSet;
    if (this.model.getBarData() != null &&
    this.model.getBarData().getDataSetCount() > 0) {
      set1 = this.model.getBarData().getDataSetByIndex(0) as BarDataSet;
      set2 = this.model.getBarData().getDataSetByIndex(1) as BarDataSet;
      set3 = this.model.getBarData().getDataSetByIndex(2) as BarDataSet;
      set4 = this.model.getBarData().getDataSetByIndex(3) as BarDataSet;
      set1.setValues(values1);
      set2.setValues(values2);
      set3.setValues(values3);
      set4.setValues(values4);
      this.model.getBarData().notifyDataChanged();
      this.model.notifyDataSetChanged();

    } else {
      let colors: number[] = [Color.rgb(104, 241, 175),Color.rgb(164, 228, 251),Color.rgb(242, 247, 158),Color.rgb(255, 102, 0)];
      set1 = new BarDataSet(values1, "Company A");
      set1.setColorsByArr(colors);
      set2 = new BarDataSet(values2, "Company B");
      set2.setColorsByArr(colors);
      set3 = new BarDataSet(values3, "Company C");
      set3.setColorsByArr(colors);
      set4 = new BarDataSet(values2, "Company D");
      set4.setColorsByArr(colors);

      let dataSets: JArrayList<IBarDataSet> = new JArrayList<IBarDataSet>();
      dataSets.add(set1);
      dataSets.add(set2);
      dataSets.add(set3);
      dataSets.add(set4);

      let data: BarData = new BarData(dataSets);


      this.model.setData(data);
    }
    this.model.getBarData().setBarWidth(barWidth);
    this.bottomAxis.setAxisMinimum(startYear);
    this.bottomAxis.setAxisMaximum(startYear + this.model.getBarData().getGroupWidth(groupSpace, barSpace) * groupCount);
    this.model.groupBars(startYear, groupSpace, barSpace);
  }
第三步：添加数据到自定义曲线图表组件
build() {
    Stack(){
      BarChart({model:this.model})
    }
  }

图表三：饼状图

第一步：导入PieChart 自定义组件：

import { PieChart } from '@ohos/ohos_mpchart'

第二步：初始化数据

pieData: PieData = null;
  @State pieModel: PieChart.Model = new PieChart.Model()
  @State @Watch("seekBarXValueWatch") seekBarX: SeekBar.Model = new SeekBar.Model()
  @State @Watch("seekBarYValueWatch") seekBarY: SeekBar.Model = new SeekBar.Model()
  parties: string[] = [
    "Party A", "Party B", "Party C", "Party D", "Party E", "Party F", "Party G", "Party H",
    "Party I", "Party J", "Party K", "Party L", "Party M", "Party N", "Party O", "Party P",
    "Party Q", "Party R", "Party S", "Party T", "Party U", "Party V", "Party W", "Party X",
    "Party Y", "Party Z"]

  private aboutToAppear(): void {
    this.pieData = this.initPieData(4, 10);
    this.pieModel
      .setPieData(this.pieData)
      .setRadius(150)
      .setHoleRadius(0.5)
      .setOffset(new MPPointF(160,200))   // vp
  }
  private initPieData(count: number, range: number): PieData{
    let entries = new JArrayList<PieEntry>();
    for (var i = 0; i < count; i++) {
      entries.add(new PieEntry(((Math.random() * range) + range / 5), this.parties[i % this.parties.length]))
    }
    //        entries.add(new PieEntry(4,'Party A'))
    //        entries.add(new PieEntry(2,'Party B'))
    //        entries.add(new PieEntry(5,'Party C'))
    //        entries.add(new PieEntry(3,'Party D'))

    let dataSet: PieDataSet = new PieDataSet(entries, "Election Results");
    dataSet.setDrawIcons(false);
    dataSet.setSliceSpace(3);
    dataSet.setIconsOffset(new MPPointF(0, 40));
    dataSet.setSelectionShift(5);

    // add a lot of colors
    let colors: JArrayList<number> = new JArrayList();
    for (let index = 0; index < ColorTemplate.VORDIPLOM_COLORS.length; index++) {
      colors.add(ColorTemplate.VORDIPLOM_COLORS[index]);
    }

    for (let index = 0; index < ColorTemplate.JOYFUL_COLORS.length; index++) {
      colors.add(ColorTemplate.JOYFUL_COLORS[index]);
    }

    for (let index = 0; index < ColorTemplate.COLORFUL_COLORS.length; index++) {
      colors.add(ColorTemplate.COLORFUL_COLORS[index]);
    }
    for (let index = 0; index < ColorTemplate.LIBERTY_COLORS.length; index++) {
      colors.add(ColorTemplate.LIBERTY_COLORS[index]);
    }
    for (let index = 0; index < ColorTemplate.PASTEL_COLORS.length; index++) {
      colors.add(ColorTemplate.PASTEL_COLORS[index]);
    }
    colors.add(ColorTemplate.getHoloBlue());
    dataSet.setColorsByList(colors);


    return new PieData(dataSet)
  }

第三步：添加数据到自定义曲线图表组件
build() {
Column() {
PieChart({
model: this.pieModel
})
}
图表四：雷达图

第一步：导入RadarChart自定义组件：

import { RadarChart } from '@ohos/ohos_mpchart';

第二步：初始化数据

width: number = 300; //表的宽度
  height: number = 300 //表的高度
  minOffset: number = 5; //X轴线偏移量
  xAxis: XAxis = new XAxis(); //顶部X轴
  yAxis: YAxis = new YAxis();
  data:RadarData= new RadarData();
  @State
  radarChartMode:RadarChartMode=new RadarChartMode();
public aboutToAppear() {
    this.model.menuItemArr = this.menuItemArr
    this.model.title = this.title

    this.data=this.initRadarData( 5,50)
    this.xAxis.setTextSize(9);
    this.xAxis.setYOffset(0);
    this.xAxis.setXOffset(0);
    this.xAxis.setTextColor(Color.White);
    const mActivities:string[] = ["Burger", "Steak", "Salad", "Pasta", "Pizza"];
    this.xAxis.setValueFormatter(new class RadarAxisValueFormatter implements IAxisValueFormatter{
      public  getFormattedValue( value:number,  axis:AxisBase):string {
        return mActivities[value % mActivities.length];
      }
    });
    this.xAxis.longest=mActivities[0];
    this.yAxis.setLabelCount(5, false);
    this.yAxis.setTextSize(9);
    this.yAxis.setAxisMinimum(0);
    this.yAxis.setAxisMaximum(80);
    this.yAxis.setDrawLabels(false);

    this.radarChartMode.mRotateEnabled=false
    this.radarChartMode.setYExtraOffset(this.model.height)
    this.radarChartMode.setXAxis(this.xAxis)
    this.radarChartMode.setYAxis(this.yAxis)
    this.radarChartMode.setWidth(this.width)
    this.radarChartMode.setHeight(this.height)
    this.radarChartMode.setMinOffset(this.minOffset)
    this.radarChartMode.setData(this.data)
    this.radarChartMode.setPaddingLeft(30)
    this.radarChartMode.setPaddingTop(100)
    this.radarChartMode.init();
    //this.animate('Animate XY')
  }
 
  private initRadarData(count: number, range: number): RadarData {
    let mul:number = 80;
    let min:number = 20;
    let cnt:number = 5;
    let entries1 = new JArrayList <RadarEntry>();
    let entries2 = new JArrayList <RadarEntry>();

    // NOTE: The order of the entries when being added to the entries array determines their position around the center of
    // the chart.
    for (let i = 0; i < cnt; i++) {
      let val1:number = Math.random() * mul + min;
      entries1.add(new RadarEntry(val1));

      let val2:number = Math.random() * mul + min;
      entries2.add(new RadarEntry(val2));
    }
    let set1:RadarDataSet = new RadarDataSet(entries1, "Last Week");
    set1.setColorByColor(0xb4676e81);
    set1.setFillColor(0xb4676e81);
    set1.setDrawFilled(true);
    set1.setFillAlpha(180);
    set1.setLineWidth(2);
    set1.setDrawHighlightCircleEnabled(true);
    set1.setDrawHighlightIndicators(false);
    set1.setHighlightCircleStrokeColor(0xffffffff);
    set1.setHighlightCircleFillColor(0xb4676e81)
    set1.setDrawValues(true)
    set1.setIconsOffset(new MPPointF(0, px2vp(0)));

    let set2:RadarDataSet = new RadarDataSet(entries2, "This Week");
    set2.setColorByColor(0xb479a2af);
    set2.setFillColor(0xb479a2af);
    set2.setDrawFilled(true);
    set2.setFillAlpha(180);
    set2.setLineWidth(2);
    set2.setDrawHighlightCircleEnabled(true);
    set2.setDrawHighlightIndicators(false);
    set2.setHighlightCircleStrokeColor(0xffffffff);
    set2.setHighlightCircleFillColor(0xb479a2af)
    set2.setDrawValues(true)
    set2.setIconsOffset(new MPPointF(0, px2vp(0)));

    let sets = new JArrayList<IRadarDataSet>();
    sets.add(set1);
    sets.add(set2);
    //
    let data:RadarData = new RadarData(sets);
    data.setValueTextSize(8);
    data.setDrawValues(this.isDrawValuesEnable);
    data.setValueTextColor(Color.White);
    return data
  }
  public getFormattedValue(value: number): string {
    var str = String(value.toFixed(1)).split(".");
    if(str[1] == "0"){
      return str[0];
    }else{
      return String(value.toFixed(1))
    }
  }

第三步：添加数据到自定义曲线图表组件

build() {
    Column() {
      Stack({ alignContent: Alignment.TopStart }) {
        RadarChart({
          radarChartMode:this.radarChartMode,
        })
      }
    }
  }

其他图表：
使用方式均与以上使用方式大同小异