//一些特定項(xiàng)目用到的UIImage+
import UIKit
extension UIImage
{
//旋轉(zhuǎn) degrees
func rotate(by degrees: CGFloat, flip: Bool? = nil) -> UIImage
{
let radians = CGFloat(degrees * (CGFloat.pi / 180.0))
let bufferView = UIView(frame: CGRect(origin: CGPoint.zero, size: self.size))
let t: CGAffineTransform = CGAffineTransform(rotationAngle: radians)
bufferView.transform = t
let bufferSize = bufferView.frame.size
UIGraphicsBeginImageContextWithOptions(bufferSize, false, self.scale)
let bitmap = UIGraphicsGetCurrentContext()
bitmap?.translateBy(x: bufferSize.width / 2, y: bufferSize.height / 2)
bitmap?.rotate(by: radians)
if let isFlipped = flip {
if !isFlipped {
bitmap?.scaleBy(x: 1.0, y: -1.0)
} else {
bitmap?.scaleBy(x: -1.0, y: -1.0)
}
} else {
bitmap?.scaleBy(x: -1.0, y: -1.0)
}
bitmap?.draw(self.cgImage!, in: CGRect(origin: CGPoint(x: -self.size.width / 2, y: -self.size.height / 2), size: self.size))
let finalBuffer = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return finalBuffer!
}
// MARK: - Init/Deinit functions
convenience init?(imageBuffer: CVPixelBuffer) {
var cgImage: CGImage?
VTCreateCGImageFromCVPixelBuffer(imageBuffer, options: nil, imageOut: &cgImage)
if let cgImage = cgImage {
self.init(cgImage: cgImage)
} else {
return nil
}
}
/// Resize image from given size.
///
/// - Parameter newSize: Size of the image output.
/// - Returns: Resized image.
func resize(to newSize: CGSize) -> UIImage {
UIGraphicsBeginImageContextWithOptions(CGSize(width: newSize.width, height: newSize.height), true, 1.0)
self.draw(in: CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height))
let resizedImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return resizedImage
}
func cutImage(rect:CGRect) ->UIImage{
let cgimage = self.cgImage
let newcgimage = cgimage?.cropping(to: rect)
print(newcgimage?.width)
let partuiimage = UIImage(cgImage: newcgimage!)
UIGraphicsBeginImageContext(self.size)
partuiimage.draw(in: rect)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image!
}
/// Crop image with given rectangle frame.
///
/// - Parameter rect: Rectangle zone taken from the original image.
/// - Returns: Cropped image.
func crop(to rect: CGRect) -> UIImage {
if let imageRef: CGImage = self.cgImage?.cropping(to: rect) {
let cropped: UIImage = UIImage(cgImage: imageRef, scale: 0, orientation: self.imageOrientation)
return cropped
}
return self
}
/// Square up the image and centerising the cropping.
///
/// - Returns: Cropped image.
func smartCrop() -> UIImage {
var imageHeight = self.size.height
var imageWidth = self.size.width
if imageHeight > imageWidth {
imageHeight = imageWidth
}
else {
imageWidth = imageHeight
}
let size = CGSize(width: imageWidth, height: imageHeight)
guard let width = self.cgImage?.width, let height = self.cgImage?.height else {
return self
}
let refWidth: CGFloat = CGFloat(width)
let refHeight: CGFloat = CGFloat(height)
let x = (refWidth - size.width) / 2
let y = (refHeight - size.height) / 2
let cropRect = CGRect(x: x, y: y, width: size.height, height: size.width)
return crop(to: cropRect)
}
//圖像buffer
var buffer: CVPixelBuffer? {
let attrs = [kCVPixelBufferCGImageCompatibilityKey: kCFBooleanTrue, kCVPixelBufferCGBitmapContextCompatibilityKey: kCFBooleanTrue] as CFDictionary
var pixelBuffer: CVPixelBuffer?
let status = CVPixelBufferCreate(kCFAllocatorDefault, Int(self.size.width), Int(self.size.height), kCVPixelFormatType_32ARGB, attrs, &pixelBuffer)
guard (status == kCVReturnSuccess) else {
return nil
}
CVPixelBufferLockBaseAddress(pixelBuffer!, CVPixelBufferLockFlags(rawValue: 0))
let pixelData = CVPixelBufferGetBaseAddress(pixelBuffer!)
let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
let context = CGContext(data: pixelData, width: Int(self.size.width), height: Int(self.size.height), bitsPerComponent: 8, bytesPerRow: CVPixelBufferGetBytesPerRow(pixelBuffer!), space: rgbColorSpace, bitmapInfo: CGImageAlphaInfo.noneSkipFirst.rawValue)
context?.translateBy(x: 0, y: self.size.height)
context?.scaleBy(x: 1.0, y: -1.0)
UIGraphicsPushContext(context!)
self.draw(in: CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height))
UIGraphicsPopContext()
CVPixelBufferUnlockBaseAddress(pixelBuffer!, CVPixelBufferLockFlags(rawValue: 0))
return pixelBuffer
}
//灰度圖片轉(zhuǎn)數(shù)組
var greyData:[UInt8]{
//var pixelValues: [UInt8]?
let width = Int(self.size.width)
let height = Int(self.size.height)
let colorSpace = self.cgImage?.colorSpace //CGColorSpaceCreateDeviceRGB()
let bitsPerComponent = 8
let bytesPerRow = width
let totalBytes = height * width
let bitmapInfo = CGImageAlphaInfo.none
var intensities = [UInt8](repeating: 0, count: Int(totalBytes))
let contextRef = CGContext(data: &intensities, width: width, height: height, bitsPerComponent: bitsPerComponent, bytesPerRow: bytesPerRow, space: colorSpace!, bitmapInfo: bitmapInfo.rawValue)
contextRef?.draw(self.cgImage!, in: CGRect(x: 0.0, y: 0.0, width: CGFloat(width), height: CGFloat(height)))
return intensities
}
/**
Converts the image into an array of RGBA bytes.
*/
@nonobjc public func toByteArray() -> [UInt8] {
let width = Int(size.width)
let height = Int(size.height)
var bytes = [UInt8](repeating: 0, count: width * height * 4)
bytes.withUnsafeMutableBytes { ptr in
if let context = CGContext(
data: ptr.baseAddress,
width: width,
height: height,
bitsPerComponent: 8,
bytesPerRow: width * 4,
space: CGColorSpaceCreateDeviceRGB(),
bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue) {
if let image = self.cgImage {
let rect = CGRect(x: 0, y: 0, width: size.width, height: size.height)
context.draw(image, in: rect)
}
}
}
return bytes
}
/**
Creates a new UIImage from an array of RGBA bytes.
*/
@nonobjc public class func fromByteArray(_ bytes: UnsafeMutableRawPointer,
width: Int,
height: Int) -> UIImage {
if let context = CGContext(data: bytes, width: width, height: height,
bitsPerComponent: 8, bytesPerRow: width * 4,
space: CGColorSpaceCreateDeviceRGB(),
bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue),
let cgImage = context.makeImage() {
return UIImage(cgImage: cgImage, scale: 0, orientation: .up)
} else {
return UIImage()
}
}
//圖片再特定點(diǎn)添加標(biāo)記（十字）
func addPoint(data:[Int]) -> UIImage {
return addPoint(data: data, color: UIColor.red)
}
func addPoint(data:[Int], color:UIColor) -> UIImage {
UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
//傳遞1：將原始圖像繪制為背景
self.draw(at: CGPoint(x: 0, y: 0))
//傳遞2：在原始圖像上繪制線條
let context = UIGraphicsGetCurrentContext()
context?.setLineWidth(1.0)
for i in 0..<data.count/2 {
let x = data[2*i]
let y = data[2*i+1]
context?.move(to: CGPoint(x:x-5,y:y))
context?.addLine(to: CGPoint(x:x+5,y:y))
context?.move(to: CGPoint(x:x,y:y-5))
context?.addLine(to: CGPoint(x:x,y:y+5))
}
//context?.move(to: CGPoint(x:10,y:10))
//context?.addLine(to: CGPoint(x:100,y:100))
context?.setStrokeColor(color.cgColor)
context?.strokePath()
//創(chuàng)建新圖像
var newImage = UIGraphicsGetImageFromCurrentImageContext()
//收拾
UIGraphicsEndImageContext()
return newImage!
}
//圖片添加線
func addLine(data1:[Int],data2:[Int]) -> UIImage {
UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
//傳遞1：將原始圖像繪制為背景
self.draw(at: CGPoint(x: 0, y: 0))
//傳遞2：在原始圖像上繪制線條
let context = UIGraphicsGetCurrentContext()
context?.setLineWidth(1.0)
for i in 0..<data1.count/2 {
let x1 = data1[2*i]
let y1 = data1[2*i+1]
let x2 = data2[2*i]
let y2 = data2[2*i+1]
context?.move(to: CGPoint(x:x1,y:y1))
context?.addLine(to: CGPoint(x:x2,y:y2))
}
context?.setStrokeColor(UIColor.green.cgColor)
context?.strokePath()
//創(chuàng)建新圖像
var newImage = UIGraphicsGetImageFromCurrentImageContext()
//收拾
UIGraphicsEndImageContext()
return newImage!
}
}
