Add PNChartDelegate for callback support #4

@@ -82,6 +82,7 @@
 		9F656B50184A4E34002E5675 /* UICountingLabel.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = UICountingLabel.m; path = PNChart/ThirdPart/UICountingLabel.m; sourceTree = "<group>"; };
 		9FA23B0E184A5944002DBBA4 /* PCChartsTableViewController.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = PCChartsTableViewController.h; sourceTree = "<group>"; };
 		9FA23B0F184A5944002DBBA4 /* PCChartsTableViewController.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = PCChartsTableViewController.m; sourceTree = "<group>"; };
+		9FE9CFB818581102005B8223 /* PNChartDelegate.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = PNChartDelegate.h; path = PNChart/PNChartDelegate.h; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -192,6 +193,7 @@
 				0AF7A8A0182AAAAA003645C4 /* PNChart.m */,
 				9F656B48184A4B83002E5675 /* PNBarChart */,
 				9F656B4B184A4BC9002E5675 /* PNCircleChart */,
+				9FE9CFB818581102005B8223 /* PNChartDelegate.h */,
 			);
 			name = PNChart;
 			sourceTree = "<group>";

@@ -7,7 +7,8 @@
 //
 
 #import <UIKit/UIKit.h>
+#import "PNChartDelegate.h"
 
-@interface PCChartsTableViewController : UITableViewController
+@interface PCChartsTableViewController : UITableViewController<PNChartDelegate>
 
 @end

@@ -63,6 +63,7 @@
         [lineChart setXLabels:@[@"SEP 1",@"SEP 2",@"SEP 3",@"SEP 4",@"SEP 5",@"SEP 6",@"SEP 7"]];
         [lineChart setYValues:@[@1,@24,@12,@18,@30,@10,@21]];
         [lineChart strokeChart];
+        lineChart.delegate = self;
         
         [viewController.view addSubview:lineChartLabel];
         [viewController.view addSubview:lineChart];
@@ -115,8 +116,14 @@
         viewController.title = @"Circle Chart";
     }
     
-    
 }
 
+-(void)userClickedOnLineKeyPoint:(CGPoint)point andPointIndex:(NSInteger)index{
+    NSLog(@"Click Key on line %f, %f and index is %d",point.x, point.y,index);
+}
+
+-(void)userClickedOnLinePoint:(CGPoint)point {
+    NSLog(@"Click on line %f, %f",point.x, point.y);
+}
 
 @end

@@ -13,6 +13,7 @@
 #import "PNLineChart.h"
 #import "PNBarChart.h"
 #import "PNCircleChart.h"
+#import "PNChartDelegate.h"
 
 typedef enum {
 	/** Solid line chart style */
@@ -25,7 +26,14 @@ typedef enum {
 } PNChartType;
 
 
-@interface PNChart : UIView
+@interface PNChart : UIView<PNChartDelegate>
+
+
+/**
+ * PNChart delegate.
+ */
+
+@property(nonatomic,retain) id<PNChartDelegate> delegate;
 
 /**
  * This method will call and troke the line in animation.

@@ -35,6 +35,8 @@
 		[_lineChart setXLabels:_xLabels];
 		[_lineChart setStrokeColor:_strokeColor];
 		[_lineChart strokeChart];
+        _lineChart.delegate = self;
+
 
 	}else if (self.type == PNBarType)
 	{
@@ -87,6 +89,12 @@
 	
 }
 
+-(void)userClickedOnLineKeyPoint:(CGPoint)point andPointIndex:(NSInteger)index{
+    [_delegate userClickedOnLineKeyPoint:point andPointIndex:index];
+}
 
+-(void)userClickedOnLinePoint:(CGPoint)point {
+    [_delegate userClickedOnLinePoint:point];
+}
 
 @end

+//
+//  PNChartDelegate.h
+//  PNChartDemo
+//
+//  Created by kevinzhow on 13-12-11.
+//  Copyright (c) 2013年 kevinzhow. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@protocol PNChartDelegate <NSObject>
+
+/**
+ * When user click on the chart line
+ *
+ */
+- (void)userClickedOnLinePoint:(CGPoint )point;
+
+/**
+ * When user click on the chart line key point
+ *
+ */
+- (void)userClickedOnLineKeyPoint:(CGPoint )point andPointIndex:(NSInteger)index;
+
+
+@end

@@ -9,6 +9,7 @@
 
 #import <UIKit/UIKit.h>
 #import <QuartzCore/QuartzCore.h>
+#import "PNChartDelegate.h"
 
 #define chartMargin     10
 #define yLabelMargin    15
@@ -20,7 +21,15 @@
  * This method will call and troke the line in animation
  */
 
--(void)strokeChart;
+- (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;
 
@@ -28,6 +37,8 @@
 
 @property (strong, nonatomic) NSArray * yValues;
 
+@property (strong, nonatomic) NSMutableArray * pathPoints;
+
 @property (nonatomic) CGFloat xLabelWidth;
 
 @property (nonatomic) int yValueMax;
@@ -38,4 +49,6 @@
 
 @property (nonatomic) BOOL showLabel;
 
+@property (nonatomic, strong)  UIBezierPath *progressline;
+
 @end

@@ -26,6 +26,8 @@
         _chartLine.lineWidth = 3.0;
         _chartLine.strokeEnd = 0.0;
         _showLabel           = YES;
+        _pathPoints = [[NSMutableArray alloc] init];
+        self.userInteractionEnabled = YES;
 		[self.layer addSublayer:_chartLine];
     }
     
@@ -94,7 +96,6 @@
         }
     }
     
-    
 }
 
 -(void)setStrokeColor:(UIColor *)strokeColor
@@ -103,11 +104,46 @@
 	_chartLine.strokeColor = [strokeColor CGColor];
 }
 
+-(void)userTouchedOnPoint:(void (^)(NSInteger *))getTouched
+{
+    
+}
+
+
+-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
+{
+    [self chechPoint:touches withEvent:event];
+}
+
+-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
+{
+    [self chechPoint:touches withEvent:event];
+}
+
+-(void)chechPoint:(NSSet *)touches withEvent:(UIEvent *)event
+{
+    UITouch *touch = [touches anyObject];
+    CGPoint touchPoint = [touch locationInView:self];
+    CGPathRef originalPath = _progressline.CGPath;
+    CGPathRef strokedPath = CGPathCreateCopyByStrokingPath(originalPath, NULL, 3.0, kCGLineCapRound, kCGLineJoinRound, 3.0);
+    BOOL pathContainsPoint = CGPathContainsPoint(strokedPath, NULL, touchPoint, NO);
+    if (pathContainsPoint)
+    {
+        [_delegate userClickedOnLinePoint:touchPoint];
+        for (NSValue *val in _pathPoints) {
+            CGPoint p = [val CGPointValue];
+            if (p.x + 3.0 > touchPoint.x && p.x - 3.0 < touchPoint.x && p.y + 3.0 > touchPoint.y && p.y - 3.0 < touchPoint.y ) {
+                [_delegate userClickedOnLineKeyPoint:touchPoint andPointIndex:[_pathPoints indexOfObject:val]];
+            }
+        }
+    }
+}
+
 -(void)strokeChart
 {
     UIGraphicsBeginImageContext(self.frame.size);
     
-    UIBezierPath *progressline = [UIBezierPath bezierPath];
+    _progressline = [UIBezierPath bezierPath];
     
     CGFloat firstValue = [[_yValues objectAtIndex:0] floatValue];
     
@@ -122,10 +158,11 @@
     float grade = (float)firstValue / (float)_yValueMax;
     
 
-    [progressline moveToPoint:CGPointMake( xPosition, chartCavanHeight - grade * chartCavanHeight + xLabelHeight)];
-    [progressline setLineWidth:3.0];
-    [progressline setLineCapStyle:kCGLineCapRound];
-    [progressline setLineJoinStyle:kCGLineJoinRound];
+    [_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];
     NSInteger index = 0;
     for (NSString * valueString in _yValues) {
         float value = [valueString floatValue];
@@ -135,16 +172,16 @@
             
             
             CGPoint point = CGPointMake(index * _xLabelWidth  + 30.0 + _xLabelWidth /2.0, chartCavanHeight - (grade * chartCavanHeight) + xLabelHeight);
-            
-            [progressline addLineToPoint:point];
-            [progressline moveToPoint:point];
+            [_pathPoints addObject:[NSValue valueWithCGPoint:point]];
+            [_progressline addLineToPoint:point];
+            [_progressline moveToPoint:point];
         }
         
         index += 1;
     }
-    [progressline stroke];
+    [_progressline stroke];
     
-    _chartLine.path = progressline.CGPath;
+    _chartLine.path = _progressline.CGPath;
 	if (_strokeColor) {
 		_chartLine.strokeColor = [_strokeColor CGColor];
 	}else{