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Bézier Curves
Ben Scheirman
nsscreencast.com
@subdigital
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let path = UIBezierPath()
path.move(to: startPoint)
path.addCurve(to: endPoint, controlPoint1: c1, controlPoint2: c2)
context.addPath(path.cgPath)
context.strokePath()
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Control points?!
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Paul de Casteljau
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class BezierView : UIView {
var startPoint: CGPoint?
var endPoint: CGPoint?
var control1: CGPoint?
var control2: CGPoint?
...
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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()
}
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Demo
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class BezierView : UIView {
var startPoint: CGPoint?
var endPoint: CGPoint?
var control1: CGPoint?
var control2: CGPoint?
...
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class BezierView : UIView {
var points: [CGPoint]
...
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if points.count >= 2 {
drawLinesBetween(context, points)
}
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func drawLinesBetween(_ context: CGContext, _ points: [CGPoint]) {
}
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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()
}
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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()
}
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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()
}
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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)
}
}
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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)
}
}
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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)
}
}
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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)
}
}
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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)
}
}
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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)
}
}
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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)
}
}
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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)
}
}
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zip(sequence1, sequence2)
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sequence1
Sequence2
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sequence1
Sequence2
zip
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sequence1
Sequence2
zip
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sequence1
Sequence2
P1
P2
P3
P4
P5
P2
P3
P4
P5
zip
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sequence1
Sequence2
P1
P2
P3
P4
P5 P2
P3
P4
P5
zip
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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)
}
}
}
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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)
}
}
}
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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)
}
}
}
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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)
}
}
}
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Rapid Feedback
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Explore!
Experiment!
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Thank you !
Ben Scheirman
nsscreencast.com
@subdigital
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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!
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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!