Improve performance and fix #16

@@ -23,12 +23,6 @@
 
 - (void)strokeChart;
 
-/**
- * This method will get the index user touched
- */
-
-- (void)userTouchedOnPoint:(void (^)(NSInteger *pointIndex))getTouched;
-
 @property(nonatomic,retain) id<PNChartDelegate> delegate;
 
 @property (strong, nonatomic) NSArray * xLabels;
@@ -41,7 +35,11 @@
 
 @property (nonatomic) CGFloat xLabelWidth;
 
-@property (nonatomic) int yValueMax;
+@property (nonatomic) float yValueMax;
+
+@property (nonatomic) float chartCavanHeight;
+
+@property (nonatomic) float xLabelHeight;
 
 @property (nonatomic,strong) CAShapeLayer * chartLine;
 

@@ -28,6 +28,8 @@
         _showLabel           = YES;
         _pathPoints = [[NSMutableArray alloc] init];
         self.userInteractionEnabled = YES;
+        _xLabelHeight = 20.0;
+        _chartCavanHeight = self.frame.size.height - chartMargin * 2 - _xLabelHeight*2 ;
 		[self.layer addSublayer:_chartLine];
     }
     
@@ -63,15 +65,13 @@
 -(void)setYLabels:(NSArray *)yLabels
 {
     
-    
-    float level = _yValueMax /[yLabels count];
+    float level = _yValueMax / 5.0;
 	
     NSInteger index = 0;
 	NSInteger num = [yLabels count] + 1;
 	while (num > 0) {
-		CGFloat chartCavanHeight = self.frame.size.height - chartMargin * 2 - 40.0 ;
-		CGFloat levelHeight = chartCavanHeight /5.0;
-		PNChartLabel * label = [[PNChartLabel alloc] initWithFrame:CGRectMake(0.0,chartCavanHeight - index * levelHeight + (levelHeight - yLabelHeight) , 20.0, yLabelHeight)];
+		CGFloat levelHeight = _chartCavanHeight /5.0;
+		PNChartLabel * label = [[PNChartLabel alloc] initWithFrame:CGRectMake(0.0,_chartCavanHeight - index * levelHeight + (levelHeight - yLabelHeight) , 20.0, yLabelHeight)];
 		[label setTextAlignment:NSTextAlignmentRight];
 		label.text = [NSString stringWithFormat:@"%1.f",level * index];
 		[self addSubview:label];
@@ -104,12 +104,6 @@
 	_chartLine.strokeColor = [strokeColor CGColor];
 }
 
--(void)userTouchedOnPoint:(void (^)(NSInteger *))getTouched
-{
-    
-}
-
-
 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
 {
     [self chechPoint:touches withEvent:event];
@@ -147,19 +141,18 @@
     
     CGFloat firstValue = [[_yValues objectAtIndex:0] floatValue];
     
-    CGFloat xPosition = 0;
-    CGFloat xLabelHeight = 20.0;
-    CGFloat chartCavanHeight = self.frame.size.height  - xLabelHeight*2;
-    if(_showLabel){
-        chartCavanHeight = self.frame.size.height - chartMargin * 2  - xLabelHeight*2;
-        xPosition = _xLabelWidth;
+    CGFloat xPosition = _xLabelWidth;
+    
+    if(!_showLabel){
+        _chartCavanHeight = self.frame.size.height  - _xLabelHeight*2;
+        xPosition = 0;
     }
     
     float grade = (float)firstValue / (float)_yValueMax;
     
 
-    [_progressline moveToPoint:CGPointMake( xPosition, chartCavanHeight - grade * chartCavanHeight + xLabelHeight)];
-    [_pathPoints addObject:[NSValue valueWithCGPoint:CGPointMake( xPosition, chartCavanHeight - grade * chartCavanHeight + xLabelHeight)]];
+    [_progressline moveToPoint:CGPointMake( xPosition, _chartCavanHeight - grade * _chartCavanHeight + _xLabelHeight)];
+    [_pathPoints addObject:[NSValue valueWithCGPoint:CGPointMake( xPosition, _chartCavanHeight - grade * _chartCavanHeight + _xLabelHeight)]];
     [_progressline setLineWidth:3.0];
     [_progressline setLineCapStyle:kCGLineCapRound];
     [_progressline setLineJoinStyle:kCGLineJoinRound];
@@ -171,7 +164,7 @@
         if (index != 0) {
             
             
-            CGPoint point = CGPointMake(index * _xLabelWidth  + 30.0 + _xLabelWidth /2.0, chartCavanHeight - (grade * chartCavanHeight) + xLabelHeight);
+            CGPoint point = CGPointMake(index * _xLabelWidth  + 30.0 + _xLabelWidth /2.0, _chartCavanHeight - (grade * _chartCavanHeight) + _xLabelHeight);
             [_pathPoints addObject:[NSValue valueWithCGPoint:point]];
             [_progressline addLineToPoint:point];
             [_progressline moveToPoint:point];