如何在aChartEngine中的折线图中正确格式化XAxis值android

Question

如何使achartEngine格式的XAxis正确？我希望它只有日期值与X轴中的日期值正确隔开，但我似乎无法让它正常工作。

这是我曾尝试：

XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset(); 
    dataset.addSeries(series); 

    XYMultipleSeriesRenderer mRenderer = new XYMultipleSeriesRenderer(); 
    mRenderer.setBackgroundColor(Color.BLACK); 
    mRenderer.setApplyBackgroundColor(true); 
    mRenderer.setGridColor(Color.LTGRAY); 
    mRenderer.setXLabels(0); 
    // mRenderer.setMargins(new int[]{0, 20, 0, 0}); 

    XYSeriesRenderer renderer = new XYSeriesRenderer(); 
    //renderer.setDisplayChartValuesDistance(1); 
    renderer.setColor(Color.GREEN); 

    mRenderer.setXLabels(10); 
     if(date_value.length < 10){ //date_value is a large array of dates for the X-Axis 

      for(int i = 0; i < date_value.length; i++){ 
       mRenderer.addXTextLabel(i+1, date_value[i]);  
      } 

     } 

     else if(date_value.length > 10){ 

      int mod = date_value.length % 10; 
      int add_mod = mod; 
      int last = date_value.length; 

      mRenderer.addXTextLabel(0, date_value[0]); 

      for(int i=0; i < 10; i++){ 
       mRenderer.addXTextLabel(i, date_value[mod]); 

        mod+=add_mod; 


      } 
      mRenderer.setXLabelsAngle(90); 
      //mRenderer.addXTextLabel(date_value.length, date_value[last]); 

     } 
    /*get the last elements in the array and parse as double to set the maximum range for X*/ 
     Calendar ist = Calendar.getInstance(); 
     Calendar last = Calendar.getInstance(); 
     ist.setTime(formatter.stringToDateReport(date_value[0])); 
     last.setTime(formatter.stringToDateReport(date_value[date_value.length-1])); 

    mRenderer.setXAxisMin(ist.get(Calendar.DATE)); 
    mRenderer.setXAxisMax(last.get(Calendar.DATE)); 
    mRenderer.addSeriesRenderer(renderer); 
    chartView = ChartFactory.getLineChartView(context, dataset, mRenderer); 

return chartView; 

这是我得到：

你可以看到，他们没有正确间隔，他们是在x轴线，并有不需要的值，例如10,15,20 ..我该如何解决这个问题？谢谢。

Answer 1

乍一看应删除线

mRenderer.setXLabels(10); 

如你想要setXLabels(0)就像你在另一行中。我认为该代码告诉AChartEngine尝试打印10个标签以及您的文本标签。

编辑：您还需要调用addXTextLabel()，其中您希望标签位于的x位置的参数。所以renderer.addXTextLabel(date_value_that_should_have_a_string, date_value_string)

Answer 2

以下代码是记录（PCM 16位）数据的正和负数值显示记录图表.....

public void onDraw(Canvas canvas) 
    {  

       paint.setColor(Color.WHITE); 
       canvas.drawLine(width/16+(width/8)+(width/100)-1,0,width/16+(width/8)+(width/100)-1,height, paint); 
       canvas.drawLine(0,height/2,width,height/2, paint); 

       canvas.drawText("32767",(width/20),height/30, paint); 
       canvas.drawText("0",(width/12),(height/2)+(height/80)-(height/2)/2, paint); 
       canvas.drawText("-32767",(width/25),height/2-height/50, paint); 

       canvas.drawText("32767",(width/20),height/2+height/50, paint); 
       canvas.drawText("0",(width/12),(height/2)+(height/80)+(height/2)/2, paint); 
       canvas.drawText("-32767",(width/25),height-height/30, paint); 

       paint.setColor(Color.GREEN); 


     for (i=0; i < second.par_second_data ; i++) 
     { 

      if (i >= 1) 
      { 
       canvas.drawLine(width/16+second.final_width-1+(width/8)+(width/100),(float) (height/2-(height/4)-(height/2*(second.audioData[i-1]-1200)/second.graph_y)),width/16+second.final_width+(width/8)+(width/100),(float) (height/2-(height/4)-(height/2*(second.audioData[i]-1200)/second.graph_y)), paint); 
       canvas.drawLine(width/16+second.final_width-1+(width/8)+(width/100),(float) (height/2+(height/4)-(height/2*(second.fftArray[i-1].re())/second.graph_z)),width/16+second.final_width+(width/8)+(width/100),(float) (height/2+(height/4)-(height/2*(second.fftArray[i].re())/second.graph_z)), paint); 

       //canvas.drawLine(width/16+second.final_width+(width/8)+(width/100),height/2-(height/4),width/16+second.final_width+(width/8)+(width/100),(float) (height/2-(height/4)-(height/2*(second.audioData[i]-1200)/second.graph_y)), paint); 
       //canvas.drawLine(width/16+second.final_width+(width/8)+(width/100),height/2+(height/4),width/16+second.final_width+(width/8)+(width/100),(float) (height/2+(height/4)-(height/2*(second.fftArray[i].re())/second.graph_z)), paint); 
      } 
       second.final_width=second.final_width+1; 
     } 
     second.final_width=0; 

    }