Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Swift draw Particles.
//
// ViewController.swift
// DrawParticle
//
// Created by naoyashiga on 2014/06/03.
// Copyright (c) 2014年 naoyashiga. All rights reserved.
//
import UIKit
class ViewController: UIViewController {
var particles:Particle[] = []
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.setShape()
self.setTimer()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//パーティクルを設定
func setShape(){
for i in 0..30{
//位置
var px = CGFloat(arc4random() % 320)
var py = CGFloat(arc4random() % 480)
var location = CGVector(px,py)
//速度
var vx = CGFloat(arc4random() % 8)
var vy = CGFloat(arc4random() % 8)
var velocity = CGVector(vx - 4,vy - 4)
var p = Particle(location:location,velocity:velocity,r:30)
p.createView()
self.view.addSubview(p.view)
particles.append(p)
}
}
//タイマー設置
func setTimer(){
var timer = NSTimer.scheduledTimerWithTimeInterval(0.01, target: self, selector: Selector("update"), userInfo: nil, repeats: true)
}
//繰り返し実行して描画
func update(){
for p in particles{
//壁の当たり判定
p.bounceWall()
p.location.dx += p.velocity.dx
p.location.dy += p.velocity.dy
p.view.frame = CGRect(x:p.location.dx,y:p.location.dy,width:10,height:10)
}
}
}
class Particle{
var location:CGVector
var velocity:CGVector
var radius:Int
var view:UIView
init(location:CGVector,velocity:CGVector,r:Int){
self.location = location
self.velocity = velocity
self.radius = r
self.view = UIView()
}
func createView(){
view.frame = CGRect(x:location.dx,y:location.dy,width:10,height:10)
view.backgroundColor = UIColor.blueColor()
view.layer.cornerRadius = 5
}
func bounceWall(){
// var screen:UIScreen = UIScreen.mainScreen()
// var screenWidth:CGFloat = CGRectGetWidth(screen)
// var screenHeight:CGFloat = CGRectGetHeight(screen)
if location.dx < CGFloat(radius) || location.dx > 320{
velocity.dx *= -1
}
if location.dy < CGFloat(radius) || location.dy > 480{
velocity.dy *= -1
}
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.