Add gradient color fill to bar chart

@@ -11,7 +11,7 @@ Pod::Spec.new do |s|
   s.author       = { "Kevin" => "kevinchou.c@gmail.com" }
 
   s.platform     = :ios, '6.0'
-  s.source       = { :git => "https://github.com/kevinzhow/PNChart.git" }
+  s.source       = { :git => "https://github.com/moflo/PNChart.git" }
 
   s.ios.dependency 'UICountingLabel', '~> 1.0.0'
 

@@ -16,6 +16,7 @@
 @property (nonatomic) float grade;
 @property (nonatomic) CAShapeLayer *chartLine;
 @property (nonatomic) UIColor *barColor;
+@property (nonatomic) UIColor *barColorGradientStart;
 @property (nonatomic) CGFloat barRadius;
 
 @end

@@ -64,6 +64,43 @@
     [_chartLine addAnimation:pathAnimation forKey:@"strokeEndAnimation"];
 
     _chartLine.strokeEnd = 1.0;
+    
+    // Check if user wants to add a gradient from the start color to the bar color
+    if (_barColorGradientStart) {
+        
+        // Add gradient
+        CAShapeLayer *gradientMask = [CAShapeLayer layer];
+        gradientMask.fillColor = [[UIColor clearColor] CGColor];
+        gradientMask.strokeColor = [[UIColor blackColor] CGColor];
+        //gradientMask.lineWidth = 4;
+        gradientMask.lineWidth    = self.frame.size.width;
+        gradientMask.frame = CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height);
+        
+        CGMutablePathRef t = CGPathCreateMutable();
+        CGPathMoveToPoint(t, NULL, 0, 0);
+        CGPathAddLineToPoint(t, NULL, self.bounds.size.width, self.bounds.size.height);
+        gradientMask.path = progressline.CGPath;
+        
+        
+        CAGradientLayer *gradientLayer = [CAGradientLayer layer];
+        gradientLayer.startPoint = CGPointMake(0.5,1.0);
+        gradientLayer.endPoint = CGPointMake(0.5,0.0);
+        gradientLayer.frame = CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height);
+        UIColor *endColor = (_barColor ? _barColor : [UIColor greenColor]);
+        NSArray *colors = @[
+                            (id)_barColorGradientStart.CGColor,
+                            (id)endColor.CGColor
+                            ];
+        gradientLayer.colors = colors;
+        
+        [gradientLayer setMask:gradientMask];
+        
+        [_chartLine addSublayer:gradientLayer];
+        
+        gradientMask.strokeEnd = 1.0;
+        [gradientMask addAnimation:pathAnimation forKey:@"strokeEndAnimation"];
+    }
+
 }
 
 
@@ -74,6 +111,17 @@
     } completion:nil];
 }
 
+- (void)setBarColorGradientStart:(UIColor *)barColorGradientStart
+{
+    // Set gradient color, remove any existing sublayer first
+    for (CALayer *sublayer in [_chartLine sublayers]) {
+        [sublayer removeFromSuperlayer];
+    }
+    _barColorGradientStart = barColorGradientStart;
+    
+    [self setGrade:_grade];
+    
+}
 
 // Only override drawRect: if you perform custom drawing.
 // An empty implementation adversely affects performance during animation.

@@ -123,6 +123,12 @@ typedef NSString *(^PNyLabelFromatter)(CGFloat yLabelValue);
  */
 @property (nonatomic) CGFloat yMinValue;
 
+/*
+ switch to indicate that the bar should be filled as a gradient
+ */
+@property (nonatomic) UIColor *barColorGradientStart;
+
+
 @property (nonatomic, retain) id<PNChartDelegate> delegate;
 
 @end

@@ -205,9 +205,14 @@
         //Height Of Bar
         bar.grade = grade;
         
+        // Add gradient
+        bar.barColorGradientStart = _barColorGradientStart;
+        
+
         //For Click Index
         bar.tag = index;
         
+        
         [_bars addObject:bar];
         [self addSubview:bar];
 

@@ -119,8 +119,13 @@
         [self.barChart setXLabels:@[@"SEP 1",@"SEP 2",@"SEP 3",@"SEP 4",@"SEP 5",@"SEP 6",@"SEP 7"]];
         [self.barChart setYValues:@[@1,@24,@12,@18,@30,@10,@21]];
         [self.barChart setStrokeColors:@[PNGreen,PNGreen,PNRed,PNGreen,PNGreen,PNYellow,PNGreen]];
+        // Adding gradient
+        self.barChart.barColorGradientStart = [UIColor blueColor];
+
         [self.barChart strokeChart];
         
+        
+
         self.barChart.delegate = self;
         
         [viewController.view addSubview:barChartLabel];
@@ -152,7 +157,7 @@
     }else if ([segue.identifier isEqualToString:@"pieChart"])
     {
         
-        //Add LineChart
+        //Add PieChart
         UILabel * pieChartLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 90, SCREEN_WIDTH, 30)];
         pieChartLabel.text = @"Pie Chart";
         pieChartLabel.textColor = PNFreshGreen;

@@ -5,6 +5,6 @@ DEPENDENCIES:
   - UICountingLabel (~> 1.0.0)
 
 SPEC CHECKSUMS:
-  UICountingLabel: bb976960c0130785a600aac592954c23eb395096
+  UICountingLabel: 0a0e9e34bf4690dbd127aaec552d19ed938087a9
 
 COCOAPODS: 0.32.1