如何用不同的顏色

Question

我創建了一個直方圖使用JFreeChart如果一個特定的值包含在垃圾桶了吧，看起來像這樣

我想強調根據欄中顯示一個直方圖酒吧代表。例如，如果下面的紅色條代表100-110（含）之間的值的數量，而我感興趣的具體數值是103.我想突出顯示條（將其更改爲與所有其他條不​​同的顏色）即紅色，而不是藍色

我想過子類的

org.jfree.data.statistics.HistogramDataset

協力XYBarR的子類使用enderer爲了充分利用

org.jfree.chart.renderer.xy.XYItemRendererState＃startSeriesPass

方法。我的想法是，我可以用不同的底色創建兩個相同的系列。並且配置startSeriesPass方法來繪製第一個系列中的所有酒吧（酒吧），除了需要突出顯示的酒吧。然後在下一次迭代期間只繪製需要從第二個序列突出顯示的條。

由於org.jfree.data.statistics.HistogramDataset將它的getBins方法定義爲包保護，所以我想象的是設計。

基礎上，我想知道是否有改變特定欄的顏色在histogramDataset

Answer 1

下面的控制器除了hi ghlighting酒吧中的直方圖數據集

package com.capitalone.mobile.orx.jchartpoc.controller; 

import java.awt.Color; 
import java.awt.Font; 
import java.awt.Paint; 
import java.io.ByteArrayOutputStream; 
import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.List; 

import lombok.Getter; 
import lombok.Setter; 

import org.jfree.chart.ChartFactory; 
import org.jfree.chart.ChartUtilities; 
import org.jfree.chart.JFreeChart; 
import org.jfree.chart.annotations.XYPointerAnnotation; 
import org.jfree.chart.plot.PlotOrientation; 
import org.jfree.chart.plot.XYPlot; 
import org.jfree.chart.renderer.xy.XYBarRenderer; 
import org.jfree.data.statistics.HistogramBin; 
import org.jfree.data.statistics.HistogramDataset; 
import org.jfree.ui.RectangleInsets; 
import org.springframework.http.HttpHeaders; 
import org.springframework.http.HttpStatus; 
import org.springframework.http.MediaType; 
import org.springframework.http.ResponseEntity; 
import org.springframework.web.bind.annotation.RequestHeader; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestMethod; 
import org.springframework.web.bind.annotation.RestController; 

/** 
* @author Norbert Powell 
* Created on Dec 21, 2016 
*/ 
@RestController 
public class HistogramController { 

    public class HistogramPlotGenerator { 
     private double upperBound; 
     private double minimum; 
     private double maximum; 
     private int bins = 10; 


     public class RelativeSpendRenderer extends XYBarRenderer{ 

      private static final long serialVersionUID = 1L; 
      @Getter @Setter 
      private int userSpendLevelBarColumn; 
      @Getter @Setter 
      private Color userSpendLevelBarColumnColor = new Color(208,48,39); 

      public RelativeSpendRenderer(int usplCol) { 
       this.userSpendLevelBarColumn = usplCol; 
      } 

      @Override 
      public Paint getItemPaint(int row, int column) { 
       if (column == userSpendLevelBarColumn){ 
        return userSpendLevelBarColumnColor; 
       } 
       return super.getItemPaint(row, column); 
      } 
     } 

     public JFreeChart createHisto(){ 
       long chartCreationTime = System.currentTimeMillis(); 
       HistogramDataset histogramDataSet = new HistogramDataset(); 
       List<Number> spendLevels = 
         Arrays.asList(12,21,34,3,24,56,7,8,9,100,75,555,65,32,566,700,800,900,307,1000,10201,222,323,444,201,111); 
       double userSpendLevelValue = spendLevels.get(10).doubleValue(); // point to be highlighted 
       double [] spls = new double [spendLevels.size()]; 
       minimum = Double.MAX_VALUE; 
       maximum = 0.0; 

       for(int i=0; i < spendLevels.size(); i++){ 
        double spl = spendLevels.get(i).doubleValue(); 
        maximum = Math.max(maximum,spl); 
        minimum = Math.min(minimum, spl); 
        spls[i] = spl; 
       } 

       upperBound = 0.0; 
       histogramDataSet.addSeries("Spend", spls, bins,minimum,maximum); 
       for (int i=0; i <bins; i++){ 
        upperBound = Math.max(histogramDataSet.getYValue(0, i), upperBound); 
       } 

       JFreeChart barGraph = ChartFactory.createHistogram(null, "$$$", null, histogramDataSet, PlotOrientation.VERTICAL, false, false, false); 
       System.out.println("Time to create bar chart: " + (System.currentTimeMillis() - chartCreationTime)+"ms"); 
       int userSpendBarIndex = getHighlightBar(userSpendLevelValue); 
       XYPlot plot = barGraph.getXYPlot(); 
       plot.setRenderer(new RelativeSpendRenderer(userSpendBarIndex)); 
       placePointer(histogramDataSet, userSpendBarIndex, plot); 
       modifyChart(barGraph); 
       return barGraph;    
     } 

     private void placePointer(HistogramDataset histogramDataSet,int userSpendBarIndex, XYPlot plot) { 
      double x =histogramDataSet.getX(0, userSpendBarIndex).doubleValue(); 
      double y = histogramDataSet.getY(0, userSpendBarIndex).doubleValue(); 
      double angle = (3*Math.PI/2); 
      XYPointerAnnotation arrow = new XYPointerAnnotation(" ", x, y, angle); 
      arrow.setTipRadius(0); // distance of arrow head from bar 
      arrow.setBaseRadius(10);// distance from arrow head to end of arrow if arrowLength and BaseRadius are > 0 and arrowLength > BaseRadius only the arrow head will be shown 
      if (y == upperBound){ 
       plot.getRangeAxis().setUpperBound(upperBound + arrow.getBaseRadius()); 
      }else{ 
       plot.getRangeAxis().setUpperBound(upperBound); 
      } 
      plot.addAnnotation(arrow); 
     } 

     private int getHighlightBar(double userSpendValue){ 
      int highlightBarIndex=0; 
      double binWidth = (maximum - minimum)/bins; 
      double lower = minimum; 
      double upper; 
      ArrayList<HistogramBin> binList = new ArrayList<HistogramBin>(bins); 
      for (int i = 0; i < bins; i++) { 
       HistogramBin bin; 
       // make sure bins[bins.length]'s upper boundary ends at maximum 
       // to avoid the rounding issue. the bins[0] lower boundary is 
       // guaranteed start from min 
       if (i == bins - 1) { 
        bin = new HistogramBin(lower, maximum); 
       } 
       else { 
        upper = minimum + (i + 1) * binWidth; 
        bin = new HistogramBin(lower, upper); 
        lower = upper; 
       } 
       binList.add(bin); 
      } 

      for(HistogramBin bin : binList){ 
       if (userSpendValue >= bin.getStartBoundary() && userSpendValue <= bin.getEndBoundary()){ 
        return highlightBarIndex; 
       } 
       highlightBarIndex++; 
      } 
      return -1; 
     } 

     private void modifyChart(JFreeChart chart) { 
       Color lineChartColor = new Color(1, 158, 213); 

       // plot manipulations 
       XYPlot xyPlotModifier = chart.getXYPlot(); 
       xyPlotModifier.setOutlineVisible(false); 
       xyPlotModifier.setRangeMinorGridlinesVisible(false); 
       xyPlotModifier.setRangeCrosshairVisible(false); 
       xyPlotModifier.setRangeGridlinesVisible(false); 
       xyPlotModifier.setRangeZeroBaselineVisible(false); 
       xyPlotModifier.setBackgroundPaint(Color.WHITE); 
       xyPlotModifier.getDataset().getSeriesCount(); 

       //Axis modifications 
       xyPlotModifier.getRangeAxis().setVisible(false); 
       xyPlotModifier.getDomainAxis().setTickLabelsVisible(false); 
       xyPlotModifier.getDomainAxis().setMinorTickMarksVisible(false); 
       xyPlotModifier.getDomainAxis().setTickMarksVisible(false); 
       xyPlotModifier.getDomainAxis().setLabelFont(new Font("SansSerif", Font.PLAIN, 1)); 
       xyPlotModifier.setAxisOffset(new RectangleInsets(0.0,0.0,0.0,0.0)); 

//    Actual data point manipulations 
       XYBarRenderer renderer = (XYBarRenderer) xyPlotModifier.getRenderer(); 
       renderer.setSeriesPaint(0,lineChartColor, true); 
       renderer.setBaseOutlinePaint(Color.BLACK, true); 
       renderer.setDrawBarOutline(true); 
       chart.removeLegend(); 
      } 

    } 

    @RequestMapping(value = "getHisto", method = RequestMethod.GET, produces = MediaType.IMAGE_PNG_VALUE) 
    public ResponseEntity<byte[]> getPNGChart(@RequestHeader HttpHeaders headers)throws Exception { 
      ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
      HistogramPlotGenerator generator = new HistogramPlotGenerator(); 
      ChartUtilities.writeBufferedImageAsPNG(baos, generator.createHisto().createBufferedImage(352, 90)); 
      return new ResponseEntity<byte[]>(baos.toByteArray(), HttpStatus.OK); 
     } 


} 

的

getHighLightBar

和

RelativeSpendRenderer類

協同工作以生成需要突出顯示的條形索引，並在打印時突出顯示索引並搜索該索引。

的placePointer方法考慮指針被放在最高的酒吧和工作，以確保該指針不被截斷

Answer 2

檢查的規範方式這Link

final CategoryItemRenderer renderer = new CustomRenderer(
     new Paint[] {Color.blue, Color.blue, Color.blue, 
      Color.red, Color.blue, Color.blue, 
      Color.blue, Color.blue} 
    ); 

只是給了特別棒

的特定顏色

你可以檢查this也