//
//  UILabel+BezierAnimation.m
//  Test
//
//  Created by senro wang on 15/8/11.
//  Copyright (c) 2015年 王燊. All rights reserved.
//

#import "UILabel+BezierAnimation.h"
#import "WSBezier.h"

#define KMaxTimes 50


@implementation UILabel (BezierAnimation)

NSMutableArray *totlePoints; //记录所有的点。

WSBezier *bezier;  //通过 改变bezier 函数的参数  （也就是 四个 控制点）可以改变动画的样式 －

float _duration; // 动画 间隔
float _fromNum;
float _toNum;



float _lastTime; //记录每一个点的 时刻

int _index;

//- (instancetype)initWithFrame:(CGRect)frame{
//    
//    if (self = [super initWithFrame:frame]) {
//        
//        [self _initBezier];
//        [self _cleanVars];
//    }
//    
//    return self;
//}


- (void)_cleanVars{
    
    _lastTime = 0;
    _index = 0;
    self.text = @"0";
    
}


//初始化 控制点
- (void)_initBezier{
    
    
    bezier = [[WSBezier alloc] init];
}


- (void)animationFromnum:(float)fromNum toNum:(float)toNum duration:(float)duration precision:(NSString*)precision{
    [self _initBezier];
    [self _cleanVars];
    
    _duration = duration;
    _fromNum = fromNum;
    _toNum = toNum;
    
    
    totlePoints = [NSMutableArray array];
    float dt = 1.0 / (KMaxTimes - 1);
    for (NSInteger i = 0; i < KMaxTimes; i ++ ) {
        
        WSPoint point = [bezier  pointWithdt:dt * i];
        
        
        float currTime = point.x * _duration;
        float currValue = point.y * (_toNum - _fromNum) + _fromNum;
        
        NSArray *array = [NSArray arrayWithObjects:[NSNumber numberWithFloat:currTime] , [NSNumber numberWithFloat:currValue], nil];
        [totlePoints addObject:array];
        
    }
    
    [self changeNumberNoBySelectorWithPrecision:precision];
    
}
- (void)changeNumberNoBySelectorWithPrecision:(NSString*)precision {
    if (_index>= KMaxTimes) {
        if([precision containsString:@"d"]){
            self.text = [NSString stringWithFormat:precision,(int)_toNum];
        }else{
            self.text = [NSString stringWithFormat:precision,_toNum];
        }
        return;
    } else {
        NSArray *pointValues = [totlePoints objectAtIndex:_index];
        _index++;
        float value = [(NSNumber *)[pointValues objectAtIndex:1] floatValue];
        float currentTime = [(NSNumber *)[pointValues objectAtIndex:0] floatValue];
        float timeDuration = currentTime - _lastTime;
        _lastTime = currentTime;
        if([precision containsString:@"d"]){
            self.text = [NSString stringWithFormat:precision,(int)value];
        }else{
            self.text = [NSString stringWithFormat:precision,value];
        }
        
        [self performSelector:@selector(changeNumberNoBySelectorWithPrecision:) withObject:precision afterDelay:timeDuration];
    }
}




@end