anchor.diff:     
       return [ seriesPoints , seriesColors , axisXinit.x , axisXinit.y , chartElements ] ;
     }
  -
  +  
     void _drawChartValues_lines(List<List<Point>> seriesPoints, List<String> seriesColors, CanvasRenderingContext2D context, int xAxisY) {
       
       for (int i = 0 ; i < seriesPoints.length ; i++) {
  
positive.code:   bool valuesFill = true ;
    bool valuesShowLines = true ;
    
    List _drawChartValues(XCharts chart, CanvasRenderingContext2D context) {
      int w = chart.width ;
      int h = chart.height ;
  
negative.code:       
        context.beginPath() ;
        
        int lastDataIdx = data.length-1 ;
        
        for (int j = 0 ; j < data.length ; j++) {
          var d = data[j] ;
          
          if (skipConsecutiveSameYValue && j > 0 && j < lastDataIdx) {
            var dPrev = data[j-1] ;
            var dNext = data[j+1] ;
          
            if ( d.y == dPrev.y && d.y == dNext.y ) {
              continue ;
            }
          }
          
          var vX = d.valueY ;
          var vY = d.valueX ;
  