Question

我正在编写一个从所选区域进行屏幕拍摄的应用程序。我知道在Mac上可以用 cmd + 命令 + 4 完成，但我需要的功能是记住最后的大小和采取的地区的位置。我需要做很多相同大小区域的屏幕。

所以..当调用一个拍摄区域拍摄的功能时，屏幕应该变得更暗，透明孔，代表区域进行屏幕拍摄。

我实现了这个目的，通过显示一个新的全屏幕窗口半透明，内部有一个洞。

洞的代码如下：

class FullTransparentRect: NSView {

    var firstMouseDownPoint: NSPoint = NSZeroPoint
    let myLayer = CAShapeLayer()
    let borderSize: CGFloat = 2.0

    override func draw(_ dirtyRect: NSRect) {
    super.draw(dirtyRect)
    self.layer?.backgroundColor = NSColor.lightGray.cgColor
    drawHole()
}

func drawHole() {
    let path = CGMutablePath()
    // Make hole in view's overlay
    path.addRect((self.superview?.bounds)!)
    path.addRect(NSRect(x: self.frame.origin.x + borderSize,
            y: self.frame.origin.y + borderSize,
            width: self.frame.size.width - (borderSize * 2),
            height: self.frame.size.height - (borderSize * 2)))

    myLayer.path = path
    myLayer.fillRule = kCAFillRuleEvenOdd
    self.superview?.layer?.mask = myLayer
    self.layer?.borderColor = NSColor.lightGray.cgColor
    self.layer?.borderWidth = borderSize
}

//Decrapted for now 
func getHole() -> CGImage {

    var rect = self.convert((self.layer?.frame)!, to: self.window?.contentView)

  //  print("rect \(rect)")

    let displayID = CGMainDisplayID()
    return  CGDisplayCreateImage(displayID, rect: rect)!
}

func setWidth(width: CGFloat) {
    var f = self.frame;
    f.size.width = width;
    self.frame = f;
}

func setHeight(height: CGFloat) {
    var f = self.frame;
    f.size.height = height;
    self.frame = f;

}


override func mouseDown(with event: NSEvent) {
    firstMouseDownPoint = (self.window?.contentView?.convert(event.locationInWindow, to: self))!
    print("Mouse on: \(event.locationInWindow)")
    print("Mouse click on : \(firstMouseDownPoint)")
}

override func mouseDragged(with event: NSEvent) {
    let newPoint = (self.window?.contentView?.convert(event.locationInWindow, to: self))!
    let offset = NSPoint(x: newPoint.x - firstMouseDownPoint.x, y: newPoint.y - firstMouseDownPoint.y)
    let origin = self.frame.origin
    let size = self.frame.size
    self.frame = NSRect(x: origin.x + offset.x, y: origin.y + offset.y, width: size.width, height: size.height)
    drawHole()
}

}

我遇到的问题是坐标的转换。

在Swift中，坐标（0.0）表示左下角，屏幕左上角。因此，即使我试图转换它也不起作用。我还有一个我需要的其他部分的屏幕。当我的洞位于底部时，CGDisplayCreateImage拍摄的屏幕位于顶部，反之亦然。

@objc func getScreenshotRect() {

    var rect = transparentHoleView?.frame
    print("Original hole is \(rect)")

    rect = screenSemiTransparentController?.view.convert(rect!, to: nil)
    print("converted is \(rect)")

    rect = screenSemiTransparentController?.view.window?.convertToScreen(rect!)

    print(" to screen converted is \(rect)")

    let userInfo = ["image": ScreenService.sharedInstance.doRegionScreen(rect!)]
    NotificationCenter.default.post(name: .imageNotification, object: nil, userInfo: userInfo)
}

public func doRegionScreen(_ region: CGRect) -> CGImage {
    let displayID = CGMainDisplayID()
    return CGDisplayCreateImage(displayID, rect: region)!
}

我做错了什么？

通过CGDisplayCeateImage拍摄屏幕不能正确获取坐标

0 个答案: