Merge pull request #49 from orlandoaleman/master

Detects touches on the bars and, if implemented, calls to the delegate

@@ -7,6 +7,7 @@
 //
 
 #import <UIKit/UIKit.h>
+#import "PNChartDelegate.h"
 
 #define chartMargin  10
 #define xLabelMargin 15
@@ -32,4 +33,5 @@
 @property (nonatomic) UIColor *barBackgroundColor;
 @property (nonatomic) BOOL showLabel;
 
+@property (nonatomic, retain) id<PNChartDelegate> delegate;
 @end

@@ -119,6 +119,7 @@
         bar.backgroundColor = _barBackgroundColor;
         bar.barColor = [self barColorAtIndex:index];
         bar.grade = grade;
+        bar.tag = index;        
         [_bars addObject:bar];
         [self addSubview:bar];
 
@@ -149,4 +150,26 @@
 }
 
 
+#pragma mark - Touch detection
+
+- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
+{
+    [self touchPoint:touches withEvent:event];
+    [super touchesBegan:touches withEvent:event];
+}
+
+
+- (void)touchPoint:(NSSet *)touches withEvent:(UIEvent *)event
+{
+    //Get the point user touched
+    UITouch *touch = [touches anyObject];
+    CGPoint touchPoint = [touch locationInView:self];
+    UIView *subview = [self hitTest:touchPoint withEvent:nil];
+    
+    if ([subview isKindOfClass:[PNBar class]] && [self.delegate respondsToSelector:@selector(userClickedOnBarCharIndex:)]) {
+        [self.delegate userClickedOnBarCharIndex:subview.tag];
+    }
+}
+
+
 @end

@@ -22,5 +22,10 @@
  */
 - (void)userClickedOnLineKeyPoint:(CGPoint)point lineIndex:(NSInteger)lineIndex andPointIndex:(NSInteger)pointIndex;
 
+/**
+ * When user click on a chart bar
+ *
+ */
+- (void)userClickedOnBarCharIndex:(NSInteger)barIndex;
 
 @end
\ No newline at end of file

@@ -111,6 +111,8 @@
         [barChart setStrokeColors:@[PNGreen,PNGreen,PNRed,PNGreen,PNGreen,PNYellow,PNGreen]];
         [barChart strokeChart];
         
+        barChart.delegate = self;
+        
         [viewController.view addSubview:barChartLabel];
         [viewController.view addSubview:barChart];
         
@@ -148,4 +150,9 @@
     NSLog(@"Click on line %f, %f, line index is %d",point.x, point.y, (int)lineIndex);
 }
 
+- (void)userClickedOnBarCharIndex:(NSInteger)barIndex
+{
+    NSLog(@"Click on bar %@", @(barIndex));
+}
+
 @end