扭曲的线条(使用非实线线型)在mac上绘制

#import <Cocoa/Cocoa.h>

@interface MyView : NSView
@end

@implementation MyView

- (void)drawRect:(NSRect)dirtyRect {
    NSBezierPath *path = [NSBezierPath bezierPath];
    [path setLineWidth:2.0];
    [path setLineCapStyle:NSRoundLineCapStyle];
    [path setLineJoinStyle:NSRoundLineJoinStyle];
    [path moveToPoint:NSMakePoint(50, 50)];
    [path curveToPoint:NSMakePoint(200, 200) controlPoint1:NSMakePoint(100, 0) controlPoint2:NSMakePoint(150, 300)];
    [[NSColor blackColor] setStroke];
    [path stroke];
}

@end

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSApplication *application = [NSApplication sharedApplication];
        NSWindow *window = [[NSWindow alloc] initWithContentRect:NSMakeRect(0, 0, 400, 400)
                                                       styleMask:NSWindowStyleMaskTitled | NSWindowStyleMaskClosable
                                                         backing:NSBackingStoreBuffered
                                                           defer:NO];
        MyView *view = [[MyView alloc] initWithFrame:NSMakeRect(0, 0, 400, 400)];
        [window setContentView:view];
        [window makeKeyAndOrderFront:nil];
        [application run];
    }
    return 0;
}