Re: Drawing gradients in views

FROM : Ian G. Gillespie
DATE : Tue Jan 28 18:11:27 2003

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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