ノギスのキバみたいになっているところはジョー（ジョウ？）と呼ぶらしい、これを使ってお気に入りの太さで線を描画するiPhoneアプリを書いてみます。
動作イメージ
XcodeからiOS6 iPhone Simulatorで動かすとこんな感じになります。
サンプルコード
#import “ViewController.h”
#import <QuartzCore/QuartzCore.h>
@interface ViewController ()
{
UIView *jawA, *jawB;
UIView *beam;
}
@end
@implementation ViewController
– (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [self color:2];
[self createScale];
[self createJaw];
}
– (void)createScale
{
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(30, 50)];
[path addLineToPoint:CGPointMake(30, 500)];
[path addLineToPoint:CGPointMake(300, 500)];
CAShapeLayer *sl = [CAShapeLayer layer];
sl.strokeColor = [self color:0].CGColor;
sl.fillColor = [UIColor clearColor].CGColor;
sl.lineWidth = 2;
sl.path = path.CGPath;
[self.view.layer addSublayer:sl];
path = [UIBezierPath bezierPath];
for (int i=0; i<10; i++) {
float x = 30;
float y = 50 + 50 * i;
[path moveToPoint:CGPointMake(x, y)];
[path addArcWithCenter:CGPointMake(x,y) radius:3 startAngle:0 endAngle:2*M_PI clockwise:YES];
}
for (int i=0; i<6; i++) {
float x = 30 + 50 * i;
float y = 500;
[path moveToPoint:CGPointMake(x, y)];
[path addArcWithCenter:CGPointMake(x,y) radius:3 startAngle:0 endAngle:2*M_PI clockwise:YES];
}
sl = [CAShapeLayer layer];
sl.fillColor = [self color:0].CGColor;
sl.path = path.CGPath;
[self.view.layer addSublayer:sl];
}
– (void)createJaw
{
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(0, 0)];
[path addLineToPoint:CGPointMake(10, 40)];
[path addLineToPoint:CGPointMake(30, 60)];
[path addLineToPoint:CGPointMake(29, 0)];
[path closePath];
jawA = [[UIView alloc] initWithFrame:CGRectMake(130, 0, 30, 60)];
[self.view addSubview:jawA];
CAShapeLayer *sl = [CAShapeLayer layer];
sl.fillColor = [self color:3].CGColor;
sl.path = path.CGPath;
[jawA.layer addSublayer:sl];
jawB = [[UIView alloc] initWithFrame:CGRectMake(160, 0, 30, 60)];
[self.view addSubview:jawB];
sl = [CAShapeLayer layer];
sl.frame = jawB.bounds;
sl.fillColor = [self color:3].CGColor;
sl.path = path.CGPath;
sl.transform = CATransform3DMakeRotation(M_PI, 0, 1, 0);
[jawB.layer addSublayer:sl];
NSArray *arr = @[jawA, jawB];
for (UIView *v in arr) {
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(slide:)];
[v addGestureRecognizer:pan];
}
}
– (void)slide:(UIPanGestureRecognizer*)gr
{
CGPoint p = [gr locationInView:self.view];
if (gr.view == jawA) {
if (p.x < jawB.center.x – jawB.bounds.size.width) {
gr.view.center = CGPointMake(p.x, gr.view.center.y);
} else {
gr.view.center = CGPointMake(jawB.center.x – jawB.bounds.size.width, gr.view.center.y);
}
} else {
if (p.x > jawA.center.x + jawA.bounds.size.width) {
gr.view.center = CGPointMake(p.x, gr.view.center.y);
} else {
gr.view.center = CGPointMake(jawA.center.x + jawA.bounds.size.width, gr.view.center.y);
}
}
if(!beam) {
beam = [[UIView alloc] initWithFrame:CGRectZero];
beam.backgroundColor = [UIColor colorWithCGColor:CGColorCreateCopyWithAlpha([self color:4].CGColor, 0.3)];
[self.view addSubview:beam];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(drawStraight:)];
[beam addGestureRecognizer:tap];
}
float x = jawA.frame.origin.x + jawA.frame.size.width;
float w = jawB.frame.origin.x – x;
beam.frame = CGRectMake(x, 30, w, 470);
}
– (void)drawStraight:(UITapGestureRecognizer*)gr
{
UIView *line = [[UIView alloc] initWithFrame:gr.view.frame];
line.layer.anchorPoint = CGPointMake(0, 0);
line.layer.position = CGPointMake(gr.view.frame.origin.x, 30);
line.transform = CGAffineTransformMakeScale(1.0, 0);
line.backgroundColor = [UIColor colorWithCGColor:CGColorCreateCopyWithAlpha([self color:1].CGColor, 0.5)];
[self.view insertSubview:line belowSubview:beam];
[UIView animateWithDuration:0.5 animations:^{
line.transform = CGAffineTransformIdentity;
}];
}
#define UIColorHex(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]
– (UIColor*)color:(int)i
{
switch (i) {
case 0:
return UIColorHex(0x96CA2D);
case 1:
return UIColorHex(0xB5E655);
case 2:
return UIColorHex(0xEDF7F2);
case 3:
return UIColorHex(0x4BB5C1);
case 4:
return UIColorHex(0x7FC6BC);
default:
break;
}
return nil;
}
– (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end