//
//  KMGuideTargetView.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2024/6/25.
//

import Cocoa

class KMGuideTargetView: NSView {
    var lineWidth: CGFloat = 2 {
        didSet {
            self.needsDisplay = true
        }
    }
    var strokeColor: NSColor = .black {
        didSet {
            self.needsDisplay = true
        }
    }
    
    var insets: NSEdgeInsets = .init(top: 0, left: 0, bottom: 0, right: 0) {
        didSet {
            self.needsDisplay = true
        }
    }
    
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)
        
        let rect = self.bounds
        let left = self.insets.left
        let top = self.insets.top
        let drawW = max(NSWidth(rect)-left-self.insets.right, 0)
        let drawH = max(NSHeight(rect)-top-self.insets.bottom, 0)
        let drawRect = NSMakeRect(left, top, drawW, drawH)
        
        let context = NSGraphicsContext.current?.cgContext
        context?.saveGState()
        context?.setLineWidth(self.lineWidth)
        context?.setStrokeColor(self.strokeColor.cgColor)
        let dxy = self.lineWidth * 0.5
        let outRect = drawRect.insetBy(dx: dxy, dy: dxy)
        context?.addEllipse(in: outRect)
        let offset: CGFloat = 4
        let inRect = outRect.insetBy(dx: dxy+offset, dy: dxy+offset)
        context?.addEllipse(in: inRect)
        context?.strokePath()
        context?.restoreGState()
    }
}