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Code Issues Packages Projects Releases Wiki Activity

Move draw(in:) to GlyphRun

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This commit is contained in:
Rob Napier
2020-01-01 14:58:19 -05:00
parent fb4673b874
commit 060e710dcb
1 changed files with 33 additions and 22 deletions
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55
PathText/Sources/PathText/PathTextView.swift
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@@ -82,9 +82,36 @@ public class PathTextView: UIView {
private struct GlyphRun {
var run: CTRun
var locations: [GlyphLocation]
mutating func updatePositions(withTangents tangents: inout TangentGenerator) {
for var location in locations {
locations = locations.map {
var location = $0
location.tangent = tangents.getTangent(at: location.anchor)
return location
}
}
func draw(in context: CGContext) {
let baseTextMatrix = context.textMatrix
defer { context.textMatrix = baseTextMatrix }
for (glyphIndex, location) in locations.enumerated() {
guard let tangent = location.tangent else { break }
context.saveGState()
defer { context.restoreGState() }
let tangentPoint = tangent.point
let angle = tangent.angle
// FIXME: Apply other attributes
context.translateBy(x: tangentPoint.x, y: tangentPoint.y)
context.rotate(by: angle)
context.textMatrix = baseTextMatrix.translatedBy(x: -location.anchor, y: 0)
CTRunDraw(run, context, CFRange(location: glyphIndex, length: 1))
}
}
}
@@ -128,8 +155,10 @@ public class PathTextView: UIView {
private func updateGlyphPositions() {
var tangents = TangentGenerator(path: path)
for var glyphRun in glyphRuns {
glyphRuns = glyphRuns.map {
var glyphRun = $0
glyphRun.updatePositions(withTangents: &tangents)
return glyphRun
}
setNeedsDisplay()
}
@@ -145,28 +174,10 @@ public class PathTextView: UIView {
let context = UIGraphicsGetCurrentContext()!
// FIXME: Check if flip is needed (macos)
let baseTextMatrix = CGAffineTransform(translationX: 0, y:0).scaledBy(x: 1, y: -1)
context.textMatrix = CGAffineTransform(translationX: 0, y:0).scaledBy(x: 1, y: -1)
for run in glyphRuns {
for (glyphIndex, location) in run.locations.enumerated() {
guard let tangent = location.tangent else { break }
context.saveGState()
defer { context.restoreGState() }
let tangentPoint = tangent.point
let angle = tangent.angle
// FIXME: Apply other attributes
context.translateBy(x: tangentPoint.x, y: tangentPoint.y)
context.rotate(by: angle)
context.textMatrix = baseTextMatrix.translatedBy(x: -location.anchor, y: 0)
CTRunDraw(run.run, context, CFRange(location: glyphIndex, length: 1))
}
run.draw(in: context)
}
}
}