Re: Drawing gradients in views

FROM : Joseph Jones
DATE : Tue Jan 28 19:47:19 2003

Here is an example:


@interface NSBezierPath(MyCategory)
- (void) myInterfaceMethod;
@end

@implementation NSBezierPath(MyCategory)
- (void) myInterfaceMethod
{
    //Some Code here
}

@end


Joe

> From: "Ian G. Gillespie" <<email_removed>>
> Date: Tue, 28 Jan 2003 09:11:27 -0800
> To: <email_removed>
> Subject: Re: Drawing gradients in views
>
> Excuse my ignorance (I am still learning, that is for sure), but how do
> I add a method to the NSBezierPath "category"?
>
> Thanks for all of the help,
> Ian
>
> On Tuesday, January 28, 2003, at 01:33  AM, Christopher Holland wrote:
>

>>> and here is my implementation of a gradient draw rect function (which
>>> I
>>> guess could be added to the NSBezierPath category as well??)
>>>
>>> - (void)_drawRect:(NSRect)rect withGradientFrom:(NSColor*)colorStart
>>> to:(NSColor*)colorEnd
>>> {
>>>      NSRect t1, t2, t3;
>>>      float r, g, b,a;
>>>      float rdiff, gdiff, bdiff, adiff;
>>>      int i;
>>>      int index = rect.size.height;
>>>      t1 = rect;
>>>
>>>      r = [colorStart redComponent];
>>>      g = [colorStart greenComponent];
>>>      b = [colorStart blueComponent];
>>>      a = [colorStart alphaComponent];
>>>
>>>      rdiff = ([colorEnd redComponent] - r)/index;
>>>      gdiff = ([colorEnd greenComponent] - g)/index;
>>>      bdiff = ([colorEnd blueComponent] - b)/index;
>>>      adiff = ([colorEnd alphaComponent] - a)/index;
>>>
>>>      for ( i = 0; i < index; i++ )
>>>      {
>>>          NSDivideRect ( t1, &t2, &t3, 1.0, NSMinYEdge);
>>>          [[NSColor colorWithDeviceRed:r green:g blue:b alpha:a] set];
>>>          NSRectFillUsingOperation(t2, NSCompositeSourceOver);
>>>          r += rdiff;
>>>          g += gdiff;
>>>          b += bdiff;
>>>          a += adiff;
>>>          t1 = t3;
>>>      }
>>> }
>>>
>>>
>>> joe

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