truetypefont.swift

//:# Playground - TrueType Font Analysis

import Cocoa
import XCPlayground

var char: Character = "书"

var font = CTFontCreateWithName("Weibei SC", 100, nil)

func findGlyph(str: String, font: CTFont) -> CGGlyph {
    let cfstr: CFString = str
    let length = CFStringGetLength(cfstr)
    let us = UnsafeMutablePointer<UniChar>.alloc(length)
    CFStringGetCharacters(cfstr, CFRangeMake(0, length), us)
    let gly = UnsafeMutablePointer<CGGlyph>.alloc(length)
    CTFontGetGlyphsForCharacters(font, us, gly, length)
    return gly[0]
}

//:### Font Properites

let glyph = findGlyph(String(char), font: font)

let ascent = CTFontGetAscent(font)

let descent = CTFontGetDescent(font)

let leading = CTFontGetLeading(font)

let unitPerEm = CTFontGetUnitsPerEm(font)

let glyphCount = CTFontGetGlyphCount(font)

let boundingBox = CTFontGetBoundingBox(font)

let underlinePosition = CTFontGetUnderlinePosition(font)

let underlineThickness = CTFontGetUnderlineThickness(font)

let slantAngle = CTFontGetSlantAngle(font)

let CapHeight = CTFontGetCapHeight(font)

let XHeight = CTFontGetXHeight(font)

let PathForGlyph = CTFontCreatePathForGlyph(font, glyph, nil)

let boundingRects = UnsafeMutablePointer<CGRect>.alloc(1)
CTFontGetBoundingRectsForGlyphs(font, CTFontOrientation.Default, [glyph], boundingRects, 1)

let advances = UnsafeMutablePointer<CGSize>.alloc(1)
CTFontGetAdvancesForGlyphs(font, CTFontOrientation.Default, [glyph], advances, 1)

class textView: NSView {
    override func drawRect(rect: CGRect) {
        let thisContext = NSGraphicsContext.currentContext()?.CGContext
        CGContextSetRGBFillColor(thisContext, 0.95, 0.95, 0.95, 1)
        CGContextFillRect(thisContext, rect)
        
        let basePoint = CGPointMake(100, 100)
        
        CGContextSetLineWidth(thisContext, 2)
        CGContextSetRGBStrokeColor(thisContext, 1, 0, 0, 1)
        CGContextAddLines(thisContext, [CGPointMake(0, basePoint.y), CGPointMake(rect.width, basePoint.y)], 2)
        CGContextStrokePath(thisContext)
        
        CGContextSetLineWidth(thisContext, 1)
        CGContextSetRGBStrokeColor(thisContext, 0, 1, 0, 1)
        CGContextAddLines(thisContext, [CGPointMake(0, basePoint.y + CapHeight), CGPointMake(rect.width, basePoint.y + CapHeight)], 2)
        CGContextStrokePath(thisContext)
        
        CGContextSetRGBStrokeColor(thisContext, 0, 1, 0, 1)
        CGContextAddLines(thisContext, [CGPointMake(0, basePoint.y + XHeight), CGPointMake(rect.width, basePoint.y + XHeight)], 2)
        CGContextStrokePath(thisContext)
        
        CGContextSetRGBStrokeColor(thisContext, 0, 1, 0, 1)
        CGContextAddLines(thisContext, [CGPointMake(0, basePoint.y + ascent), CGPointMake(rect.width, basePoint.y + ascent)], 2)
        CGContextStrokePath(thisContext)
        
        CGContextSetRGBStrokeColor(thisContext, 0, 1, 0, 1)
        CGContextAddLines(thisContext, [CGPointMake(0, basePoint.y - descent), CGPointMake(rect.width, basePoint.y - descent)], 2)
        CGContextStrokePath(thisContext)
        
        CGContextSetRGBStrokeColor(thisContext, 0, 1, 0, 1)
        CGContextAddLines(thisContext, [CGPointMake(0, basePoint.y - descent - leading), CGPointMake(rect.width, basePoint.y - descent - leading)], 2)
        CGContextStrokePath(thisContext)
        
        CGContextSetRGBStrokeColor(thisContext, 0, 0, 1, 1)
        CGContextStrokeRect(thisContext, CGRectOffset(boundingBox, basePoint.x, basePoint.y))
        CGContextStrokeRect(thisContext, CGRectOffset(boundingRects[0], basePoint.x, basePoint.y))
        CGContextStrokeRect(thisContext, NSRect(origin: basePoint, size: advances[0]))
        let unionrect = CGRectUnion(CGRectOffset(boundingRects[0], basePoint.x, basePoint.y), NSRect(origin: basePoint, size: advances[0]))
        CGContextStrokeRect(thisContext, unionrect)
        
        
        CGContextSetRGBStrokeColor(thisContext, 1, 0, 1, 0.7)
        CGContextAddLines(thisContext, [CGPointMake(unionrect.origin.x, ascent + basePoint.y + 20), CGPointMake(unionrect.origin.x, basePoint.y - descent - 25)], 2)
        CGContextAddLines(thisContext, [CGPointMake(unionrect.origin.x + unionrect.width, ascent + basePoint.y + 20), CGPointMake(unionrect.origin.x + unionrect.width, basePoint.y - descent - 25)], 2)
        CGContextAddLines(thisContext, [CGPointMake(unionrect.origin.x - 20, ascent + basePoint.y), CGPointMake(unionrect.origin.x + unionrect.width + 20, ascent + basePoint.y)], 2)
        CGContextAddLines(thisContext, [CGPointMake(unionrect.origin.x - 20, basePoint.y - descent), CGPointMake(unionrect.origin.x + unionrect.width + 20, basePoint.y - descent)], 2)
        CGContextStrokePath(thisContext)
        
        
        CGContextSetRGBFillColor(thisContext, 0, 0, 0, 1)
        CGContextSetRGBStrokeColor(thisContext, 0, 0, 0, 1)
        CGContextAddPath(thisContext, CGPathCreateCopyByTransformingPath(PathForGlyph, [CGAffineTransformMakeTranslation(basePoint.x, basePoint.y)]))
        CGContextFillPath(thisContext)
        
    }
}

textView(frame: NSRect(x: 0, y: 0, width: 600, height: 200))

XCPShowView("textView", view: textView(frame: NSRect(x: 0, y: 0, width: 600, height: 600)))