#import "MyObject.h"

@implementation MyObject

- (IBAction)myAction:(id)sender
{

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

[gradient drawFromPoint: NSMakePoint(100,100)
toPoint: NSMakePoint(0,50)
options: NSGradientDrawsBeforeStartingLocation
];

// NSGradientDrawsBeforeStartingLocation = (1 << 0),
// NSGradientDrawsAfterEndingLocation = (1 << 1),

[theView unlockFocus];
}

@end