polyline max min

ViewController.mm

//
//  ViewController.m
//  polylineMax
//
//  Created by Mizushima Yusuke on 9/12/15.
//  Copyright (c) 2015 Yusuke Mizusima. All rights reserved.
//

#import "ViewController.h"
#include <vector>
#include <memory>
using namespace std;

class FindMaxMin {
public:
    CGPoint maxP;
    CGPoint minP = CGPointMake(0, 9999);
    void find(vector<CGPoint> pts) {
        for (CGPoint p : pts) {
            if (maxP.y <= p.y) maxP = p;
            if (minP.y >= p.y) minP = p;
        }
    }
};

@interface ViewController () {
    vector<CGPoint> points;
    float dy;
}
@property (nonatomic, weak) UILabel *min;
@property (nonatomic, weak) UILabel *max;
@property (nonatomic, weak) UIView *graph;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIFont *font = [UIFont fontWithName:@"HiraKakuProN-W3" size:30];
    
    UIColor *colorA = [UIColor colorWithHue:0.25 saturation:0.3 brightness:1 alpha:1];
    UIColor *colorB = [UIColor colorWithHue:0.55 saturation:0.4 brightness:0.8 alpha:1];

    self.view.backgroundColor = colorA;
    
    CGRect oRect = self.view.bounds;
    float l = oRect.size.width;
    UIView *gsheet = [[UIView alloc] initWithFrame:CGRectMake(l * 0.05, l * 0.1, l * 0.9, 450)];
    gsheet.backgroundColor = colorB;
    [self.view addSubview:gsheet];
    self.graph = gsheet;
    
    
    for(int i = 0; i < 2; i++) {
        float h = i ? l * 0.4 : l * 0.7;
        UIView *line = [[UIView alloc] initWithFrame:CGRectMake(l * 0.1, h, l * 0.7, 2)];
        line.backgroundColor = colorA;
        [self.view addSubview:line];
        
        UILabel *n = [[UILabel alloc] init];
        n.text = i ? @"50" : @"100";
        n.font = font;
        n.textColor = colorA;
        [n sizeToFit];
        n.center = CGPointMake(l * 0.88, h);
        [self.view addSubview:n];
    }
    
    dy = (l * 0.6) / 100.0;
    for (int i=0; i<30; i++) {
        float y = (arc4random() % 100) * dy;
        CGPoint p = CGPointMake(i * 9 + 10, y);
        points.emplace_back(p);
        
        UIView *dot = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 5, 5)];
        dot.backgroundColor = colorA;
        dot.transform = CGAffineTransformMakeRotation(M_PI * 0.25);
        dot.center = p;
        [gsheet addSubview:dot];
    }
    
    UILabel *min = [[UILabel alloc] init];
    min.text = @"MIN";
    min.font = font;
    min.textColor = colorA;
    [min sizeToFit];
    min.frame = CGRectMake(l * 0.1, l * 0.99, min.frame.size.width, min.frame.size.height);
    [self.view addSubview:min];
    self.min = min;
    
    UILabel *max = [[UILabel alloc] init];
    max.text = @"MAX";
    max.font = font;
    max.textColor = colorA;
    [max sizeToFit];
    max.frame = CGRectMake(l * 0.1, l * 1.14, max.frame.size.width, max.frame.size.height);
    [self.view addSubview:max];
    self.max = max;
    
    
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
    btn.frame = CGRectMake(l * 0.05, 470 + l * 0.1, l * 0.9, 100);
    btn.backgroundColor = colorB;
    btn.titleLabel.font = font;
    [btn setTitle:@"Calculate" forState:UIControlStateNormal];
    [btn setTitleColor:colorA forState:UIControlStateNormal];
    [self.view addSubview:btn];
    [btn addTarget:self action:@selector(calc) forControlEvents:UIControlEventTouchUpInside];
}

- (void)calc {
    shared_ptr<FindMaxMin> cppClass(new FindMaxMin());
    cppClass->find(points);
    
    UIView *marker = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];
    marker.layer.borderColor = [UIColor redColor].CGColor;
    marker.layer.borderWidth = 2;
    [self.view addSubview:marker];
    
    for (int i=0; i<points.size(); i++) {
        CGPoint p = points[i];
        [UIView animateWithDuration:0.1 delay:0.2 * i options:0 animations:^{
            marker.center = [self.graph convertPoint:p toView:self.view];
            marker.transform = CGAffineTransformRotate(marker.transform, 0.3);
        } completion:^(BOOL finished) {
            if (p.y == cppClass->maxP.y) {
                UIView *maxV = [self.graph hitTest:p withEvent:nil];
                maxV.backgroundColor = [UIColor blueColor];
                maxV.transform = CGAffineTransformMakeScale(3, 3);
                
                UILabel *mx = [[UILabel alloc] init];
                mx.font = self.max.font;
                mx.textColor = self.max.textColor;
                mx.frame = CGRectMake(self.max.frame.origin.x + 100, self.max.frame.origin.y, 120, self.max.frame.size.height);
                mx.text = [NSString stringWithFormat:@"%d", (int)(p.y / dy)];
                [self.view addSubview:mx];
            }
            if (p.y == cppClass->minP.y) {
                UIView *minV = [self.graph hitTest:p withEvent:nil];
                minV.backgroundColor = [UIColor orangeColor];
                minV.transform = CGAffineTransformMakeScale(3, 3);
                
                UILabel *mn = [[UILabel alloc] init];
                mn.font = self.max.font;
                mn.textColor = self.max.textColor;
                mn.frame = CGRectMake(self.min.frame.origin.x + 100, self.min.frame.origin.y, 120, self.min.frame.size.height);
                mn.text = [NSString stringWithFormat:@"%d", (int)(p.y / dy)];
                [self.view addSubview:mn];
            }
        }];
        
    }
}

@end

http://lepetit-prince.net/ios/?p=4344