<br > #VBPieChart

Animated Pie Chart control for iOS apps, based on CALayer. Very easy in use and have custom labeling.

##Usage

Create simple pi chart with VBPieChart:

VBPieChart *chart = [[VBPieChart alloc] initWithFrame:CGRectMake(10, 50, 300, 300)];
[self.view addSubview:chart];

// Setup some options:
[chart setEnableStrokeColor:YES]; 
[chart setHoleRadiusPrecent:0.3]; /* hole inside of chart */

// Prepare your data
NSArray *chartValues = @[
 @{@"name":@"Apples", @"value":@50, @"color":[UIColor redColor]},
 @{@"name":@"Pears", @"value":@20, @"color":[UIColor blueColor]},
 @{@"name":@"Oranges", @"value":@40, @"color":[UIColor orangeColor]},
 @{@"name":@"Bananas", @"value":@70, @"color":[UIColor purpleColor]}
];

// Present pie chart with animation
[chart setChartValues:chartValues animation:YES duration:0.4 options:VBPieChartAnimationFan];

chartValues needs to be defined as an array of dictionaries.
Dictionary required to contain value for piece with key value.
Optional:

• name
• color
• labelColor
• accent
• strokeColor

Chart from JSON

VBPieChart *chart = [[VBPieChart alloc] initWithFrame:CGRectMake(10, 50, 300, 300)];
chart.startAngle = M_PI+M_PI_2;
chart.holeRadiusPrecent = 0.5;
[self.view addSubview:chart];
NSString *json_example = @"[ {\"name\":\"first\", \"value\":\"50\", \"color\":\"#84C69B\", \"strokeColor\":\"#fff\"}, \
{\"name\":\"second\", \"value\":\"60\", \"color\":\"#FECEA8\", \"strokeColor\":\"#fff\"}, \
{\"name\":\"second\", \"value\":\"75\", \"color\":\"#F7EEBB\", \"strokeColor\":\"#fff\"}, \
{\"name\":\"second\", \"value\":\"90\", \"color\":\"#D7C1E0\", \"strokeColor\":\"#fff\"} ]";

NSData *data = [json_example dataUsingEncoding:NSUTF8StringEncoding];
NSArray *chartValues = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

[chart setChartValues:chartValues animation:YES duration:0.5 options:VBPieChartAnimationFan];

Chart with custom label position

VBPieChart *chart = [[VBPieChart alloc] initWithFrame:CGRectMake(10, 50, 300, 300)];
chart.startAngle = M_PI+M_PI_2;
chart.holeRadiusPrecent = 0.5;
[self.view addSubview:chart];
[chart setLabelsPosition:VBLabelsPositionCustom];
[chart setLabelBlock:^CGPoint( CALayer *layer, NSInteger index) {
    CGPoint p = CGPointMake(sin(-index/10.0*M_PI)*50+50, index*30);
    return p;
}];

[chart setChartValues:@[
                         @{@"name":@"37%", @"value":@65, @"color":@"#5677fcaa", @"labelColor":@"#000"},
                         @{@"name":@"13%", @"value":@23, @"color":@"#2baf2baa", @"labelColor":@"#000"},
                         @{@"name":@"19.3%", @"value":@34, @"color":@"#b0bec5aa", @"labelColor":@"#000"},
                         @{@"name":@"30.7%", @"value":@54, @"color":@"#f57c00aa", @"labelColor":@"#000"}
                         ]
             animation:YES];

Basic Documentation

VBPieChart is subclass of UIView.

####Properties

length
Length of circle pie. Min values is 0 and max value 2*M_PI.

startAngle
Start angle of pie. (M_PI will make start at left side)

holeRadiusPrecent
hole radius in % of whole radius. Values 0..1. (acual hole radius will be calculated radius*holeRadiusPrecent)

radiusPrecent
Defines the radius, full radius = frame.size.width/2, actual radius = full radius*radiusPrecent. Value 0..1.

labelBlock
Block will help to redefine positions for labels.

####Methods

Get all changed chart values back.
- (NSArray *) chartValues;

Simple setup data.
- (void) setChartValues:(NSArray *)chartValues;

Setup data to pie chart with animation or not, animation options and duration.
- (void) setChartValues:(NSArray *)chartValues animation:(BOOL)animation duration:(float)duration options:(VBPieChartAnimationOptions)options;

Animation options:

• VBPieChartAnimationFanAll
• VBPieChartAnimationGrowth
• VBPieChartAnimationGrowthAll
• VBPieChartAnimationGrowthBack
• VBPieChartAnimationGrowthBackAll
• VBPieChartAnimationFan
• VBPieChartAnimationTimingEaseInOut
• VBPieChartAnimationTimingEaseIn
• VBPieChartAnimationTimingEaseOut
• VBPieChartAnimationTimingLinear

Change value for elemet at index. Value will be changed with animation.
- (void) setValue:(NSNumber*)value pieceAtIndex:(NSInteger)index;

Insert new piece at index. Animated. - (void) insertChartValue:(NSDictionary*)chartValue atIndex:(NSInteger)index;

Remove piece at index.
- (void) removePieceAtIndex:(NSInteger)index;

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