Merge pull request #199 from makoni/master

- Fix for issue: https://github.com/kevinzhow/PNChart/issues/198

@@ -61,6 +61,10 @@
     _showChartBorder     = NO;
     _yChartLabelWidth    = 18;
     _rotateForXAxisText  = false;
+	
+	yLabelFormatter = ^(CGFloat yValue){
+		return [NSString stringWithFormat:@"%1.f",yValue];
+	};
 }
 
 - (void)setYValues:(NSArray *)yValues
@@ -141,9 +145,10 @@
     }else{
         _xChartLabels = [NSMutableArray new];
     }
-    
-    if (_showLabel) {
-        _xLabelWidth = (self.frame.size.width - _chartMargin * 2) / [xLabels count];
+	
+	_xLabelWidth = (self.frame.size.width - _chartMargin * 2) / [xLabels count];
+	
+    if (_showLabel) {		
         int labelAddCount = 0;
         for (int index = 0; index < _xLabels.count; index++) {
             labelAddCount += 1;

@@ -409,7 +409,7 @@
             if (!(_yValueMax - _yValueMin)) {
                 innerGrade = 0.5;
             } else {
-                innerGrade = (yValue - _yValueMin) / (_yValueMax - _yValueMin) == 0 ? 0.5 : (yValue - _yValueMin) / (_yValueMax - _yValueMin);
+                innerGrade = (yValue - _yValueMin) / (_yValueMax - _yValueMin);
             }
             
             CGFloat offSetX = (_chartCavanWidth) / (chartData.itemCount);