なぞったりタップしたりでカラフルな波紋を表示してみる
(XcodeのiOS6 iPhone Simulatorで試しています。)
ポイント
・波紋がぶつかったら円の色を変える
・２円の中心と、半径から接触したかどうかを判定
サンプルコード
#import “ViewController.h”
#import <QuartzCore/QuartzCore.h>
@interface ViewController () {
CADisplayLink *timer;
}
@end
@implementation ViewController
– (void)viewDidLoad
{
[super viewDidLoad];
[self createRainbowColor];
[self start];
}
– (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint p = [[touches anyObject] locationInView:self.view];
UIView *ripple = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 10)];
ripple.backgroundColor = [UIColor clearColor];
ripple.layer.borderWidth = 3.0;
ripple.layer.cornerRadius = 5;
ripple.center = p;
[self.view addSubview:ripple];
}
– (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint p = [[touches anyObject] locationInView:self.view];
UIView *ripple = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 10)];
ripple.backgroundColor = [UIColor clearColor];
ripple.layer.borderWidth = 3.0;
ripple.layer.cornerRadius = 5;
ripple.center = p;
[self.view addSubview:ripple];
}
– (void)start
{
timer = [CADisplayLink displayLinkWithTarget:self selector:@selector(updateDisp:)];
[timer addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
}
// 色
//Red: (255, 0, 0)
//Orange: (255, 127, 0)
//Yellow: (255, 255, 0)
//Green: (0, 255, 0)
//Blue: (0, 0, 255)
//Indigo: (75, 0, 130)
//Violet: (143, 0, 255)
static NSArray *rainbow;
– (void)createRainbowColor
{
UIColor *red = [UIColor colorWithRed:255.0/255.0 green:0 blue:0 alpha:1.0];
UIColor *orange = [UIColor colorWithRed:255.0/255.0 green:127.0/255.0 blue:0 alpha:1.0];
UIColor *yellow = [UIColor colorWithRed:255.0/255.0 green:255.0/255.0 blue:0 alpha:1.0];
UIColor *green = [UIColor colorWithRed:0 green:255.0/255.0 blue:0 alpha:1.0];
UIColor *blue = [UIColor colorWithRed:0 green:0 blue:255.0/255.0 alpha:1.0];
UIColor *indigo = [UIColor colorWithRed:75.0/255.0 green:0 blue:130/255.0 alpha:1.0];
UIColor *violet = [UIColor colorWithRed:143.0/255.0 green:0 blue:255.0/255.0 alpha:1.0];
rainbow = [NSArray arrayWithObjects:red, orange, yellow, green, blue, indigo, violet, nil];
}
– (void)updateDisp:(CADisplayLink*)sender
{
for (UIView *v in self.view.subviews) {
v.bounds = CGRectMake(0,0,v.bounds.size.width +2, v.bounds.size.height +2);
v.layer.cornerRadius = v.bounds.size.width * 0.5;
// でかくなったら消す
if (v.bounds.size.width > 300) {
[v removeFromSuperview];
}
}
// 輪の干渉をチェック
// 中心と半径で
for (UIView *v1 in self.view.subviews) {
for (UIView *v2 in self.view.subviews) {
if (v1 == v2) continue;
// 中心間の距離
float d = hypotf(v2.center.x – v1.center.x, v2.center.y – v1.center.y);
float r = v1.bounds.size.width * 0.5 + v2.bounds.size.width * 0.5;
if (abs(d – r) < 0.02) {
v1.tag++;
}
}
if (v1.tag > 0) {
v1.layer.borderColor = ((UIColor*)[rainbow objectAtIndex:v1.tag % 7]).CGColor;
}
}
}
– (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end