PNBar.m
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//
// PNBar.m
// PNChartDemo
//
// Created by kevin on 11/7/13.
// Copyright (c) 2013年 kevinzhow. All rights reserved.
//
#import "PNBar.h"
#import "PNColor.h"
@implementation PNBar
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
_chartLine = [CAShapeLayer layer];
_chartLine.lineCap = kCALineCapButt;
_chartLine.fillColor = [[UIColor whiteColor] CGColor];
_chartLine.lineWidth = self.frame.size.width;
_chartLine.strokeEnd = 0.0;
self.clipsToBounds = YES;
[self.layer addSublayer:_chartLine];
self.barRadius = 2.0;
}
return self;
}
-(void)setBarRadius:(CGFloat)barRadius
{
_barRadius = barRadius;
self.layer.cornerRadius = _barRadius;
}
- (void)setGrade:(float)grade
{
_grade = grade;
UIBezierPath *progressline = [UIBezierPath bezierPath];
[progressline moveToPoint:CGPointMake(self.frame.size.width / 2.0, self.frame.size.height)];
[progressline addLineToPoint:CGPointMake(self.frame.size.width / 2.0, (1 - grade) * self.frame.size.height)];
[progressline setLineWidth:1.0];
[progressline setLineCapStyle:kCGLineCapSquare];
_chartLine.path = progressline.CGPath;
if (_barColor) {
_chartLine.strokeColor = [_barColor CGColor];
}
else {
_chartLine.strokeColor = [PNGreen CGColor];
}
CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
pathAnimation.duration = 1.0;
pathAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
pathAnimation.fromValue = @0.0f;
pathAnimation.toValue = @1.0f;
[_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);
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"];
}
}
- (void)rollBack
{
[UIView animateWithDuration:0.3 delay:0.0 options:UIViewAnimationOptionCurveEaseOut animations: ^{
_chartLine.strokeColor = [UIColor clearColor].CGColor;
} 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.
- (void)drawRect:(CGRect)rect
{
//Draw BG
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, self.backgroundColor.CGColor);
CGContextFillRect(context, rect);
}
@end