NSGradient:drawFromCenter:radius:toCenter:radius:options:

-(void) drawFromCenter:(NSPoint)startCenter
　　　radius:(CGFloat)startRadius
　　　toCenter:(NSPoint)endCenter
　　　radius:(CGFloat)endRadius
　　　options:(NSGradientDrawingOptions)options

#import "MyObject.h"

@implementation MyObject

- (IBAction)myAction:(id)sender
{

NSGradient *gradient = [[NSGradient alloc] initWithColors:
[NSArray arrayWithObjects:
[NSColor redColor],
[NSColor greenColor],
nil
]
];
[theView lockFocus];

[gradient drawFromCenter:NSMakePoint(100,100)
radius:(CGFloat)10.5
toCenter:NSMakePoint(80,80)
radius: (CGFloat)80.3
options: NSGradientDrawsBeforeStartingLocation
];
// NSGradientDrawsBeforeStartingLocation = (1 << 0),
// NSGradientDrawsAfterEndingLocation = (1 << 1),

[theView unlockFocus];
}

@end

【パラメータ】
startCenter	開始円の中心点
startRadius	開始円の半径
endCenter	終了円の中心点
endRadius	終了円の半径
options	オプション

【返り値】
void	なし