Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Bézier Curves
Search
Ben Scheirman
March 02, 2018
Programming
1
4.8k
Bézier Curves
Presented at try! Swift Tokyo 2018
Ben Scheirman
March 02, 2018
Tweet
Share
More Decks by Ben Scheirman
See All by Ben Scheirman
A Promise for a Better Future
subdigital
0
120
Buckets of Code
subdigital
0
1.9k
Building 5 Calls for iOS
subdigital
0
94
Swift on Linux
subdigital
1
760
tvOS Workshop
subdigital
1
110
Swift Solutions
subdigital
2
440
iOS 8 Networking
subdigital
4
880
iOS 8 App Extensions
subdigital
1
360
Effective Networking with iOS 8 and Swift
subdigital
4
1.6k
Other Decks in Programming
See All in Programming
AmperとFleetを使ったAndroidアプリ
yoppie
0
250
GitHub Copilotのススメ
marcy731
1
220
From Spring Boot 2 to Spring Boot 3 with Java 21 and Jakarta EE
ivargrimstad
0
560
『Railsオワコン』と言われる時代に、なぜブルーモ証券はRailsを選ぶのか
free_world21
1
360
禅の心を手に入れよ
eltociear
1
350
MicrosoftのPlatform Engineeringガイドを読んで実際になにかやってみた
ymd65536
1
510
CDKコントリビュートの最初の壁を越えよう! -簡単issueの見つけ方-
badmintoncryer
3
210
初心者のためのRubyKaigi入門/RubyKaigi Introduction
a_matsuda
10
1.4k
PHPの次期バージョンはこの時期どうなっているのか - Internalsの開発体制について - PHPカンファレンス小田原
youkidearitai
PRO
1
220
Code Reviews
bkuhlmann
4
900
Elm Form Validation
bkuhlmann
0
510
Introducing Kotlin Multiplatform in an existing mobile app - Workshop Edition | AndroidMakers Paris
prof18
0
150
Featured
See All Featured
ParisWeb 2013: Learning to Love: Crash Course in Emotional UX Design
dotmariusz
104
6.6k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
8
1.3k
No one is an island. Learnings from fostering a developers community.
thoeni
16
2.1k
Side Projects
sachag
451
41k
Why Our Code Smells
bkeepers
PRO
331
56k
Java REST API Framework Comparison - PWX 2021
mraible
PRO
18
6.9k
It's Worth the Effort
3n
180
27k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
26
2.3k
Stop Working from a Prison Cell
hatefulcrawdad
267
19k
How GitHub (no longer) Works
holman
305
140k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
352
28k
Making the Leap to Tech Lead
cromwellryan
125
8.5k
Transcript
Bézier Curves Ben Scheirman nsscreencast.com @subdigital
None
None
None
let path = UIBezierPath() path.move(to: startPoint) path.addCurve(to: endPoint, controlPoint1: c1,
controlPoint2: c2) context.addPath(path.cgPath) context.strokePath()
Control points?!
Paul de Casteljau
None
None
None
None
None
None
None
None
None
None
None
None
class BezierView : UIView { var startPoint: CGPoint? var endPoint:
CGPoint? var control1: CGPoint? var control2: CGPoint? ...
func drawPoint(_ context: CGContext, p: CGPoint, color: UIColor, radius: CGFloat)
{ color.setFill() context.addArc(center: p, radius: radius, startAngle: 0, endAngle: .pi * 2, clockwise: true) context.fillPath() }
Demo
class BezierView : UIView { var startPoint: CGPoint? var endPoint:
CGPoint? var control1: CGPoint? var control2: CGPoint? ...
class BezierView : UIView { var points: [CGPoint] ...
if points.count >= 2 { drawLinesBetween(context, points) }
func drawLinesBetween(_ context: CGContext, _ points: [CGPoint]) { }
func drawLinesBetween(_ context: CGContext, _ points: [CGPoint]) { points.first.flatMap {
context.move(to: $0) } points.dropFirst().forEach { context.addLine(to: $0 ) } context.setLineWidth(3) context.setLineDash(phase: 0, lengths: [2]) UIColor.lightGray.setStroke() context.strokePath() }
func drawLinesBetween(_ context: CGContext, _ points: [CGPoint]) { points.first.flatMap {
context.move(to: $0) } points.dropFirst().forEach { context.addLine(to: $0 ) } context.setLineWidth(3) context.setLineDash(phase: 0, lengths: [2]) UIColor.lightGray.setStroke() context.strokePath() }
func drawLinesBetween(_ context: CGContext, _ points: [CGPoint]) { points.first.flatMap {
context.move(to: $0) } points.dropFirst().forEach { context.addLine(to: $0 ) } context.setLineWidth(3) context.setLineDash(phase: 0, lengths: [2]) UIColor.lightGray.setStroke() context.strokePath() }
func drawLinesBetween(_ context: CGContext, _ points: [CGPoint]) { points.first.flatMap {
context.move(to: $0) } points.dropFirst().forEach { context.addLine(to: $0 ) } context.setLineWidth(3) context.setLineDash(phase: 0, lengths: [2]) UIColor.lightGray.setStroke() context.strokePath() if timeValue > 0 { interpolateBetween(context, points) } }
func interpolateBetween(_ context: CGContext, _ points: [CGPoint]) { guard points.count
>= 2 else { return } var interpolated: [CGPoint] = [] for i in 0 ..< points.count-1 { let p1 = points[i] let p2 = points[i+1] let t = p1.lerp(p2, t: timeValue) interpolated.append(t) drawPoint(context, p: t, color: .lightGray, radius: 6) } }
func interpolateBetween(_ context: CGContext, _ points: [CGPoint]) { guard points.count
>= 2 else { return } var interpolated: [CGPoint] = [] for i in 0 ..< points.count-1 { let p1 = points[i] let p2 = points[i+1] let t = p1.lerp(p2, t: timeValue) interpolated.append(t) drawPoint(context, p: t, color: .lightGray, radius: 6) } }
func interpolateBetween(_ context: CGContext, _ points: [CGPoint]) { guard points.count
>= 2 else { return } var interpolated: [CGPoint] = [] for i in 0 ..< points.count-1 { let p1 = points[i] let p2 = points[i+1] let t = p1.lerp(p2, t: timeValue) interpolated.append(t) drawPoint(context, p: t, color: .lightGray, radius: 6) } }
func interpolateBetween(_ context: CGContext, _ points: [CGPoint]) { guard points.count
>= 2 else { return } var interpolated: [CGPoint] = [] for i in 0 ..< points.count-1 { let p1 = points[i] let p2 = points[i+1] let t = p1.lerp(p2, t: timeValue) interpolated.append(t) drawPoint(context, p: t, color: .lightGray, radius: 6) } }
func interpolateBetween(_ context: CGContext, _ points: [CGPoint]) { guard points.count
>= 2 else { return } var interpolated: [CGPoint] = [] for i in 0 ..< points.count-1 { let p1 = points[i] let p2 = points[i+1] let t = p1.lerp(p2, t: timeValue) interpolated.append(t) drawPoint(context, p: t, color: .lightGray, radius: 6) } }
func interpolateBetween(_ context: CGContext, _ points: [CGPoint]) { guard points.count
>= 2 else { return } var interpolated: [CGPoint] = [] for i in 0 ..< points.count-1 { let p1 = points[i] let p2 = points[i+1] let t = p1.lerp(p2, t: timeValue) interpolated.append(t) drawPoint(context, p: t, color: .lightGray, radius: 6) } }
func interpolateBetween(_ context: CGContext, _ points: [CGPoint]) { guard points.count
>= 2 else { return } var interpolated: [CGPoint] = [] for i in 0 ..< points.count-1 { let p1 = points[i] let p2 = points[i+1] let t = p1.lerp(p2, t: timeValue) interpolated.append(t) drawPoint(context, p: t, color: .lightGray, radius: 6) } if interpolated.count >= 2 { drawLinesBetween(context, interpolated) } }
zip(sequence1, sequence2)
sequence1 Sequence2
sequence1 Sequence2 zip
sequence1 Sequence2 zip
sequence1 Sequence2 P1 P2 P3 P4 P5 P2 P3 P4
P5 zip
sequence1 Sequence2 P1 P2 P3 P4 P5 P2 P3 P4
P5 zip
func interpZip(points: [CGPoint]) -> (CGFloat) -> [CGPoint] { return {
t in let pairs = zip(points, points.dropFirst()) return pairs.map { pair in return lerp(pair.0, pair.1, t) } } }
func interpZip(points: [CGPoint]) -> (CGFloat) -> [CGPoint] { return {
t in let pairs = zip(points, points.dropFirst()) return pairs.map { pair in return lerp(pair.0, pair.1, t) } } }
func interpZip(points: [CGPoint]) -> (CGFloat) -> [CGPoint] { return {
t in let pairs = zip(points, points.dropFirst()) return pairs.map { pair in return lerp(pair.0, pair.1, t) } } }
func interpZip(points: [CGPoint]) -> (CGFloat) -> [CGPoint] { return {
t in let pairs = zip(points, points.dropFirst()) return pairs.map { pair in return pair.0.lerp(pair.1, t: timeValue) } } }
None
Rapid Feedback
Explore! Experiment!
Thank you ! Ben Scheirman nsscreencast.com @subdigital
Thank you ! Ben Scheirman nsscreencast.com @subdigital Ask me for
a sticker! ステッカーが欲しかったら話 しかけてください!
Thank you ! Ben Scheirman nsscreencast.com @subdigital Ask me for
a sticker! ステッカーが欲しかったら話 しかけてください!