难以理解NSBezierPath的curveToPoint：方法

我试图去掌握Cocoa中的绘图（相当基本）形状。我理解如何创建直线边缘（嘟嘟！），但是当谈到做曲线时，我无法理解哪些输入会产生什么形状的曲线。具体来说，我不知道该方法的参数如何影响形状。难以理解NSBezierPath的curveToPoint：方法

我试图接近在谷歌浏览器选项卡的形状：

而且我正在使用的代码是：

-(void)drawRect:(NSRect)dirtyRect { 
    NSSize size = [self bounds].size; 

    CGFloat height = size.height; 
    CGFloat width = size.width; 

    NSBezierPath *path = [NSBezierPath bezierPath]; 
    [path setLineWidth:1]; 

    [path moveToPoint:NSMakePoint(0, 0)]; 

    [path curveToPoint:NSMakePoint(width * 0.1, height) 
     controlPoint1:NSMakePoint(width * 0.05, height) 
     controlPoint2:NSMakePoint(width * 0.03, height * 0.05)]; 

    [path lineToPoint:NSMakePoint(width * 0.9, height)]; 

    [path curveToPoint:NSMakePoint(width, 0) 
     controlPoint1:NSMakePoint(width * 0.95, height) 
     controlPoint2:NSMakePoint(width * 0.97, height * 0.05)]; 

    [path closePath]; 

    [[NSColor colorWithCalibratedWhite:0.98 alpha:1] set]; 
    [path fill]; 

    [[NSColor colorWithCalibratedWhite:0.6 alpha:1] set]; 
    [path stroke]; 
}

我失败的可怕。

看到的，这就是为什么我们不能有好东西:(

My Attempt