cocoa - 绘制插入 NSShadow 和插入描边

Question

我有一个NSBezierPath并且我想在路径内绘制嵌入阴影（类似于 Photoshop）。

有没有办法做到这一点？另外，我知道你可以使用-stroke路径，但是你可以在路径内描边（类似于 Photoshop 中的描边）吗？

更新 3

static NSImage * graydient = nil;

if (!graydient) {
    graydient = [[NSImage alloc] initWithSize: NSMakeSize(22, 22)];
    [graydient lockFocus];

    NSGradient * gradient = [[NSGradient alloc] initWithColorsAndLocations: clr(@"#262729"), 0.0f, clr(@"#37383a"), 0.43f, clr(@"#37383a"), 1.0f, nil];
    [gradient drawInRect: NSMakeRect(0, 4.179, 22, 13.578) angle: 90.0f];
    [gradient release];

    [graydient unlockFocus];
}

NSColor * gcolor = [NSColor colorWithPatternImage: graydient];

[gcolor set];

NSShadow * shadow = [NSShadow new];
[shadow setShadowColor: [NSColor colorWithDeviceWhite: 1.0f alpha: 1.0f]];
[shadow setShadowBlurRadius: 0.0f];
[shadow setShadowOffset: NSMakeSize(0, 1)];
[shadow set];

[path fill];

[NSGraphicsContext saveGraphicsState];

[[path pathFromIntersectionWithPath: [NSBezierPath bezierPathWithRect: NSInsetRect([path bounds], 0.6, 0)]] setClip];

[gcolor set];

[shadow setShadowOffset: NSMakeSize(0, 1)];
[shadow setShadowColor: [NSColor blackColor]];
[shadow set];

[outer stroke];

[NSGraphicsContext restoreGraphicsState];

[NSGraphicsContext saveGraphicsState];

[[NSGraphicsContext currentContext] setCompositingOperation: NSCompositeSourceOut];

[shadow set];
[[NSColor whiteColor] set];
[inner fill];

[shadow set];
[inner fill];

[NSGraphicsContext restoreGraphicsState];

这是我的最终结果。它看起来很不错。我必须将阴影更改为 White @ 1.0 Alpha 才能使其正常工作。即使菜单栏项目的阴影 alpha 标准是 0.5，它看起来也不错。

非常感谢Joshua Nozzi。

Answer 1

我认为您可以通过在贝塞尔路径上设置剪辑以将其用作蒙版并抚摸阴影，然后在需要时添加正常笔触来做到这一点。

根据更新的代码更新：

干得好。今晚我感觉拖拖拉拉。:-)

// Describe an inset rect (adjust for pixel border)
NSRect whiteRect = NSInsetRect([self bounds], 20, 20);
whiteRect.origin.x += 0.5;
whiteRect.origin.y += 0.5;

// Create and fill the shown path
NSBezierPath * path = [NSBezierPath bezierPathWithRect:whiteRect];
[[NSColor whiteColor] set];
[path fill];

// Save the graphics state for shadow
[NSGraphicsContext saveGraphicsState];

// Set the shown path as the clip
[path setClip];

// Create and stroke the shadow
NSShadow * shadow = [[[NSShadow alloc] init] autorelease];
[shadow setShadowColor:[NSColor redColor]];
[shadow setShadowBlurRadius:10.0];
[shadow set];
[path stroke];

// Restore the graphics state
[NSGraphicsContext restoreGraphicsState];

// Add a nice stroke for a border
[path setLineWidth:1.0];
[[NSColor grayColor] set];
[path stroke];