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Code Issues 5 Packages Projects Releases 3 Wiki Activity

feat: smooth out stroke

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dscyrescotti
2024-05-15 09:06:52 +07:00
parent 9d2b633f86
commit c0c039ebfe
2 changed files with 20 additions and 21 deletions
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4
Memola/Canvas/Contexts/GraphicContext.swift
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@@ -134,7 +134,9 @@ extension GraphicContext {
func appendStroke(with point: CGPoint) {
guard let currentStroke else { return }
guard let currentPoint, point.distance(to: currentPoint) > currentStroke.thickness * currentStroke.penStyle.anyPenStyle.stepRate else { return }
guard let currentPoint, point.distance(to: currentPoint) > currentStroke.thickness * currentStroke.penStyle.anyPenStyle.stepRate else {
return
}
currentStroke.append(to: point)
self.currentPoint = point
}

37
Memola/Canvas/Geometries/Stroke/Generators/SolidPointStrokeGenerator.swift
View File

@@ -16,11 +16,11 @@ struct SolidPointStrokeGenerator: StrokeGenerator {
}
func append(to point: CGPoint, on stroke: Stroke) {
guard stroke.keyPoints.count > 0 else {
guard stroke.keyPoints.endIndex > 0 else {
return
}
stroke.keyPoints.append(point)
switch stroke.keyPoints.count {
switch stroke.keyPoints.endIndex {
case 2:
let start = stroke.keyPoints[0]
let end = stroke.keyPoints[1]
@@ -28,7 +28,7 @@ struct SolidPointStrokeGenerator: StrokeGenerator {
addCurve(from: start, to: end, by: control, on: stroke)
case 3:
stroke.removeQuads(from: stroke.quadIndex + 1)
let index = stroke.keyPoints.count - 1
let index = stroke.keyPoints.endIndex - 1
var start = stroke.keyPoints[index - 2]
var end = CGPoint.middle(p1: stroke.keyPoints[index - 2], p2: stroke.keyPoints[index - 1])
var control = CGPoint.middle(p1: start, p2: end)
@@ -39,7 +39,7 @@ struct SolidPointStrokeGenerator: StrokeGenerator {
addCurve(from: start, to: end, by: control, on: stroke)
default:
smoothOutPath(on: stroke)
let index = stroke.keyPoints.count - 1
let index = stroke.keyPoints.endIndex - 1
let start = CGPoint.middle(p1: stroke.keyPoints[index - 2], p2: stroke.keyPoints[index - 1])
let control = stroke.keyPoints[index - 1]
let end = CGPoint.middle(p1: stroke.keyPoints[index - 1], p2: stroke.keyPoints[index])
@@ -48,12 +48,12 @@ struct SolidPointStrokeGenerator: StrokeGenerator {
}
func finish(at point: CGPoint, on stroke: Stroke) {
switch stroke.keyPoints.count {
switch stroke.keyPoints.endIndex {
case 0...1:
break
default:
append(to: point, on: stroke)
let index = stroke.keyPoints.count - 1
let index = stroke.keyPoints.endIndex - 1
let start = CGPoint.middle(p1: stroke.keyPoints[index - 2], p2: stroke.keyPoints[index - 1])
let end = stroke.keyPoints[index]
let control = CGPoint.middle(p1: start, p2: end)
@@ -64,37 +64,34 @@ struct SolidPointStrokeGenerator: StrokeGenerator {
private func smoothOutPath(on stroke: Stroke) {
stroke.removeQuads(from: stroke.quadIndex + 1)
adjustPreviousKeyPoint(on: stroke)
switch stroke.keyPoints.count {
switch stroke.keyPoints.endIndex {
case 4:
let index = stroke.keyPoints.count - 2
let index = stroke.keyPoints.endIndex - 2
let start = stroke.keyPoints[index - 2]
let end = CGPoint.middle(p1: stroke.keyPoints[index - 2], p2: stroke.keyPoints[index - 1])
let control = CGPoint.middle(p1: start, p2: end)
addCurve(from: start, to: end, by: control, on: stroke)
fallthrough
default:
let index = stroke.keyPoints.count - 2
let index = stroke.keyPoints.endIndex - 2
let start = CGPoint.middle(p1: stroke.keyPoints[index - 2], p2: stroke.keyPoints[index - 1])
let control = stroke.keyPoints[index - 1]
let end = CGPoint.middle(p1: stroke.keyPoints[index - 1], p2: stroke.keyPoints[index])
addCurve(from: start, to: end, by: control, on: stroke)
}
stroke.quadIndex = stroke.quads.count - 1
stroke.quadIndex = stroke.quads.endIndex - 1
}
private func adjustPreviousKeyPoint(on stroke: Stroke) {
let index = stroke.keyPoints.count - 1
let prev = stroke.keyPoints[index - 1]
let index = stroke.keyPoints.endIndex - 1
let prev = stroke.keyPoints[index - 2]
let mid = stroke.keyPoints[index - 1]
let current = stroke.keyPoints[index]
let averageX = (prev.x + current.x) / 2
let averageY = (prev.y + current.y) / 2
let averageX = (prev.x + current.x + mid.x) / 3
let averageY = (prev.y + current.y + mid.y) / 3
let point = CGPoint(x: averageX, y: averageY)
if index != 0 {
stroke.keyPoints[index] = point
}
if index - 1 != 0 {
stroke.keyPoints[index - 1] = point
}
stroke.keyPoints[index] = point
stroke.keyPoints[index - 1] = point
}
private func addPoint(_ point: CGPoint, on stroke: Stroke) {