的Android - 填寫使用MPAndroidChart

我使用setFillFormatter兩條線之間的顏色，但它沒有幫助我，並setfillColor（）穿過第二線（黑色），因爲沒有辦法阻止第一行（黃色）在第二行的Y值。我想實現這樣的事情：

dataSet.setFillFormatter(new IFillFormatter() { 

      @Override 
      public float getFillLinePosition(ILineDataSet dataSet, LineDataProvider dataProvider) { 
       return //return Y value of the second line for current X of line being filled; 
      } 
     });

有沒有辦法找到第一線的每一X的第二行的Y值？我同時看到dataSet和dataProvider爲getFillLinePosition的每個調用返回固定值。

來源

2017-04-11 Amit

我不認爲你可以做到這一點用在圖書館所提供的方法。您可能必須編寫自定義渲染器來執行此操作。看看'LineChartRenderer' –

感謝David Rawson指着我朝着LineChartRenderer。我能夠在兩行之間着色區域。

我們需要做兩個重大的改變。

執行自定義FillFormator以返回另一行的數據集。

public class MyFillFormatter implements IFillFormatter { 
private ILineDataSet boundaryDataSet; 

public MyFillFormatter() { 
    this(null); 
} 
//Pass the dataset of other line in the Constructor 
public MyFillFormatter(ILineDataSet boundaryDataSet) { 
    this.boundaryDataSet = boundaryDataSet; 
} 

@Override 
public float getFillLinePosition(ILineDataSet dataSet, LineDataProvider dataProvider) { 
    return 0; 
} 

//Define a new method which is used in the LineChartRenderer 
public List<Entry> getFillLineBoundary() { 
    if(boundaryDataSet != null) { 
     return ((LineDataSet) boundaryDataSet).getValues(); 
    } 
    return null; 
}}

實現自定義LineChartRenderer繪製和填充封閉路徑。

public class MyLineLegendRenderer extends LineChartRenderer { 

public MyLineLegendRenderer(LineDataProvider chart, ChartAnimator animator, ViewPortHandler viewPortHandler) { 
    super(chart, animator, viewPortHandler); 
} 

//This method is same as it's parent implemntation 
@Override 
protected void drawLinearFill(Canvas c, ILineDataSet dataSet, Transformer trans, XBounds bounds) { 
    final Path filled = mGenerateFilledPathBuffer; 

    final int startingIndex = bounds.min; 
    final int endingIndex = bounds.range + bounds.min; 
    final int indexInterval = 128; 

    int currentStartIndex = 0; 
    int currentEndIndex = indexInterval; 
    int iterations = 0; 

    // Doing this iteratively in order to avoid OutOfMemory errors that can happen on large bounds sets. 
    do { 
     currentStartIndex = startingIndex + (iterations * indexInterval); 
     currentEndIndex = currentStartIndex + indexInterval; 
     currentEndIndex = currentEndIndex > endingIndex ? endingIndex : currentEndIndex; 

     if (currentStartIndex <= currentEndIndex) { 
      generateFilledPath(dataSet, currentStartIndex, currentEndIndex, filled); 

      trans.pathValueToPixel(filled); 

      final Drawable drawable = dataSet.getFillDrawable(); 
      if (drawable != null) { 

       drawFilledPath(c, filled, drawable); 
      } else { 

       drawFilledPath(c, filled, dataSet.getFillColor(), dataSet.getFillAlpha()); 
      } 
     } 

     iterations++; 

    } while (currentStartIndex <= currentEndIndex); 
} 

//This is where we define the area to be filled. 
private void generateFilledPath(final ILineDataSet dataSet, final int startIndex, final int endIndex, final Path outputPath) { 

    //Call the custom method to retrieve the dataset for other line 
    final List<Entry> boundaryEntry = ((MyFillFormatter)dataSet.getFillFormatter()).getFillLineBoundary(); 

    final float phaseY = mAnimator.getPhaseY();  
    final Path filled = outputPath; 
    filled.reset(); 

    final Entry entry = dataSet.getEntryForIndex(startIndex); 

    filled.moveTo(entry.getX(), boundaryEntry.get(0).getY()); 
    filled.lineTo(entry.getX(), entry.getY() * phaseY); 

    // create a new path 
    Entry currentEntry = null; 
    Entry previousEntry = null; 
    for (int x = startIndex + 1; x <= endIndex; x++) { 

     currentEntry = dataSet.getEntryForIndex(x); 
     filled.lineTo(currentEntry.getX(), currentEntry.getY() * phaseY); 

    } 

    // close up 
    if (currentEntry != null && previousEntry!= null) { 
     filled.lineTo(currentEntry.getX(), previousEntry.getY()); 
    } 

    //Draw the path towards the other line 
    for (int x = endIndex ; x > startIndex; x--) { 
     previousEntry = boundaryEntry.get(x); 
     filled.lineTo(previousEntry.getX(), previousEntry.getY() * phaseY); 
    } 

    filled.close(); 
}}

在活動

路過另一LineDataSet作爲參數，最終將MyFillFormatter到LineDataSet之一。

lineDataSet2.setFillFormatter(new MyFillFormatter(LineDataSet1)); 

mChart.setRenderer(new MyLineLegendRenderer(mChart, mChart.getAnimator(), mChart.getViewPortHandler()));

來源

2017-04-17 13:25:00 Amit

的Android - 填寫使用MPAndroidChart

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