mirror of
https://github.com/zhigang1992/CurvyText.git
synced 2026-03-27 22:49:13 +08:00
Use all core text
This commit is contained in:
Rob Napier
@@ -28,118 +28,99 @@ private struct GlyphPosition {
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@available(iOS 13.0, *)
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public struct PathText {
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public var text: NSAttributedString {
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get { textStorage }
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set {
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textStorage.setAttributedString(newValue)
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let line = CTLineCreateWithAttributedString(textStorage)
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var positions: [GlyphPosition] = []
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var ascent: CGFloat = 0
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var descent: CGFloat = 0
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var position: CGPoint = .zero
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for run in CTLineGetGlyphRuns(line) as! [CTRun] {
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let glyphCount = CTRunGetGlyphCount(run)
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let stringIndexes = UnsafeMutableBufferPointer<CFIndex>.allocate(capacity: glyphCount)
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defer { stringIndexes.deallocate() }
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CTRunGetStringIndices(run, CFRange(), stringIndexes.baseAddress!)
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// Remember, it's possible to have one character made up of multiple glyphs (Ö can be two glyphs)
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// Also, one glyph can be multiple characters (ff ligature)
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var glyphIndex = 0
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while glyphIndex < glyphCount {
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let glyphRange = CFRange(location: glyphIndex, length: 1)
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let currentCharacterIndex = stringIndexes[glyphIndex]
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let nextCharacterIndex = (glyphIndex == glyphCount - 1) ? textStorage.string.count : stringIndexes[glyphIndex + 1]
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let characterRange = CFRange(location: currentCharacterIndex, length: nextCharacterIndex - currentCharacterIndex)
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let attributedString = textStorage.attributedSubstring(from: NSRange(location: characterRange.location,
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length: characterRange.length))
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let attributes = CTRunGetAttributes(run) as NSDictionary // Includes manufactured attributes, particularly font
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let font = attributes[NSAttributedString.Key.font] as? UIFont ?? UIFont.systemFont(ofSize: UIFont.systemFontSize)
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let baseline = font.descender
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let width = CTRunGetTypographicBounds(run, glyphRange,
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&ascent, &descent, nil)
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CTRunGetPositions(run, glyphRange, &position)
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let rect = CGRect(origin: position, size: CGSize(width: CGFloat(width),
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height: ascent + descent))
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positions.append(GlyphPosition(attributedString: attributedString, baseline: baseline, rect: rect))
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glyphIndex += 1 // FIXME: Handle multiple glyphs for a single character
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}
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}
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self.glyphPositions = positions
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// locations = (0..<layoutManager.numberOfGlyphs).map { [layoutManager] glyphIndex in
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// return layoutManager.boundingRect(forGlyphRange: NSRange(location: glyphIndex, length: 1),
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// in: textContainer)
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//// let leadingBottom = layoutManager.location(forGlyphAt: glyphIndex).x
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//// let rect = layoutManager.boundingRect(forGlyphRange: NSRange(location: glyphIndex, length: 1),
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//// in: textContainer)
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//// return leadingBottom + rect.size.width / 2
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// }
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lineFragmentOrigin = layoutManager
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.lineFragmentRect(forGlyphAt: 0, effectiveRange: nil)
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.origin
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didSet {
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updatePositions()
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}
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}
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public var path: Path {
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didSet {
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updateRuns()
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}
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}
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public var path: Path
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private var glyphPositions: [GlyphPosition] = []
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private let layoutManager = NSLayoutManager()
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private let textStorage = NSTextStorage()
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private let textContainer = NSTextContainer()
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// private var locations: [CGRect] = []
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private var lineFragmentOrigin = CGPoint.zero
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public init(text: NSAttributedString, path: Path) {
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self.path = path
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// layoutManager.addTextContainer(textContainer)
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// textStorage.addLayoutManager(layoutManager)
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self.text = text
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updatePositions()
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}
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mutating private func updatePositions() {
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let line = CTLineCreateWithAttributedString(text)
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var positions: [GlyphPosition] = []
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var ascent: CGFloat = 0
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var descent: CGFloat = 0
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var position: CGPoint = .zero
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for run in CTLineGetGlyphRuns(line) as! [CTRun] {
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let glyphCount = CTRunGetGlyphCount(run)
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let stringIndexes = UnsafeMutableBufferPointer<CFIndex>.allocate(capacity: glyphCount)
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defer { stringIndexes.deallocate() }
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CTRunGetStringIndices(run, CFRange(), stringIndexes.baseAddress!)
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// Remember, it's possible to have one character made up of multiple glyphs (Ö can be two glyphs)
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// Also, one glyph can be multiple characters (ff ligature)
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var glyphIndex = 0
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while glyphIndex < glyphCount {
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let glyphRange = CFRange(location: glyphIndex, length: 1)
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let currentCharacterIndex = stringIndexes[glyphIndex]
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let nextCharacterIndex = (glyphIndex == glyphCount - 1) ? text.string.count : stringIndexes[glyphIndex + 1]
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let characterRange = CFRange(location: currentCharacterIndex, length: nextCharacterIndex - currentCharacterIndex)
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let attributedString = text.attributedSubstring(from: NSRange(location: characterRange.location,
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length: characterRange.length))
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let attributes = CTRunGetAttributes(run) as NSDictionary // Includes manufactured attributes, particularly font
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let font = attributes[NSAttributedString.Key.font] as? UIFont ?? UIFont.systemFont(ofSize: UIFont.systemFontSize)
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let baseline = font.descender
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let width = CTRunGetTypographicBounds(run, glyphRange,
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&ascent, &descent, nil)
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CTRunGetPositions(run, glyphRange, &position)
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let rect = CGRect(origin: position, size: CGSize(width: CGFloat(width),
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height: ascent + descent))
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positions.append(GlyphPosition(attributedString: attributedString, baseline: baseline, rect: rect))
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glyphIndex += 1 // FIXME: Handle multiple glyphs for a single character
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}
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}
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self.glyphPositions = positions
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updateRuns()
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}
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mutating private func updateRuns() {
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let tangents = path.getTangents(atLocations: glyphPositions.map {$0.rect.midX})
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var runs: [Run] = []
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for (tangent, position) in zip(tangents, glyphPositions) {
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runs.append(Run(angle: Double(tangent.angle), point: tangent.point, position: position))
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}
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self.runs = runs
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}
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private struct Run: Identifiable {
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let id = UUID()
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let angle: Double
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let point: CGPoint
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let position: GlyphPosition
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}
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private var runs: [Run] = []
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}
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@available(iOS 13.0, *)
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extension PathText: View {
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public var body: some View {
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let tangents = path.getTangents(atLocations: glyphPositions.map {$0.rect.midX})
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var strings: [String] = [] // FIXME: Will be NSAttributedString
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var glyphRange = NSRange(location: 0, length: 1)
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while NSMaxRange(glyphRange) < layoutManager.numberOfGlyphs {
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let characterRange = layoutManager.characterRange(forGlyphRange: glyphRange,
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actualGlyphRange: &glyphRange)
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strings.append(textStorage.attributedSubstring(from: characterRange).string)
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glyphRange = NSRange(location: NSMaxRange(glyphRange), length: 1)
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}
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struct Run: Identifiable {
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let id = UUID()
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let angle: Double
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let point: CGPoint
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let position: GlyphPosition
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}
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var runs: [Run] = []
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for (tangent, position) in zip(tangents, glyphPositions) {
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runs.append(Run(angle: Double(tangent.angle), point: tangent.point, position: position))
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}
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// FIXME: include lineFragmentOrigin (but currently it's .zero)
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return ZStack {
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