利用CGContext轉出bitmap點陣字

	import Foundation
	import Cocoa
	func text2bitmap(text: String, font: NSFont) -> [[Bool]]? {
	let attributes = [NSAttributedStringKey.font:font]
	let size = text.size(withAttributes: attributes)
	let width = Int(size.width)
	let height = Int(size.height)
	let bytesPerRow = width
	let dataSize = bytesPerRow * height
	var pixelData = [UInt8](repeating: 0, count: dataSize)
	let colorSpace = CGColorSpaceCreateDeviceGray()
	guard let context = CGContext(data: &pixelData,
	width: width,
	height: height,
	bitsPerComponent: 8,
	bytesPerRow: bytesPerRow,
	space: colorSpace,
	bitmapInfo: CGImageAlphaInfo.alphaOnly.rawValue)
	else {
	return nil
	}
	context.setShouldAntialias(false)
	NSGraphicsContext.saveGraphicsState()
	NSGraphicsContext.current = NSGraphicsContext(cgContext: context, flipped: false)
	text.draw(at: NSPoint.zero, withAttributes: attributes)
	NSGraphicsContext.restoreGraphicsState()
	var isTop = true
	var bitmap = [[Bool]]()
	for i in 0..<height {
	var line = [Bool]()
	for j in 0..<width {
	let pix = pixelData[i * bytesPerRow + j]
	line.append(pix > 128)
	}
	if isTop {
	if line.contains(true) {
	isTop = false
	bitmap.append(line)
	}
	} else {
	bitmap.append(line)
	}
	}
	while let last = bitmap.last, last.contains(true) == false {
	bitmap.removeLast()
	}
	return bitmap
	}
	let text = "1"
	if
	let font = NSFont(name: "Helvetica", size: 8),
	let bitmap = text2bitmap(text: text, font: font)
	{
	for line in bitmap {
	var txt = ""
	for pix in line {
	txt += pix ? "■" : "□"
	}
	print(txt)
	}
	}

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