在Swift中绘制圆(MacOS)

import Cocoa

class MyView: NSView {
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)
        
        // 获取当前绘制上下文
        guard let context = NSGraphicsContext.current?.cgContext else { return }
        
        // 设置圆的中心点和半径
        let center = CGPoint(x: dirtyRect.midX, y: dirtyRect.midY)
        let radius: CGFloat = min(dirtyRect.width, dirtyRect.height) / 2 - 10
        
        // 设置圆的填充颜色
        context.setFillColor(NSColor.red.cgColor)
        
        // 绘制圆
        context.addArc(center: center, radius: radius, startAngle: 0, endAngle: CGFloat.pi * 2, clockwise: true)
        context.fillPath()
    }
}

// 创建窗口和视图
let frame = NSRect(x: 0, y: 0, width: 400, height: 400)
let window = NSWindow(contentRect: frame, styleMask: [.titled, .closable, .miniaturizable, .resizable], backing: .buffered, defer: false)
let view = MyView(frame: frame)

// 将视图添加到窗口中
window.contentView = view

// 显示窗口
window.makeKeyAndOrderFront(nil)

// 进入主循环
NSApplication.shared.run()