[Drawkit] Styling line end caps

[Brad Larson]

Thanks for the pointer.  For the record, I was able to achieve what I  
wanted using

DKStyle* featureStyle = [[DKStyle alloc] init];
	
DKFill* featureFill = [DKFill fillWithColour:[[NSColor blackColor]  
colorWithAlphaComponent:0.25]];
[featureStyle addRenderer:featureFill];
	
DKStroke* featureStroke = [DKStroke strokeWithWidth:lineWidth colour: 
[NSColor blackColor]];
[featureStroke setLineCapStyle:NSRoundLineCapStyle];
[featureStroke setLineJoinStyle:NSRoundLineJoinStyle];
[featureStyle addRenderer:featureStroke];

and then a

[currentPath setStyle:featureStyle];

on the desired paths.

While this works just fine, there are convenience constructors for  
creating a DKStyle with a certain fill and line width.  Maybe adding  
cap and join properties onto another DKStyle convenience constructor  
might make the process more intuitive.  Something like

+ (DKStyle*)		styleWithFillColour:(NSColor*) fc strokeColour: 
(NSColor*) sc strokeWidth:(float) sw strokeCapStyle:(NSLineCapStyle)  
cs strokeJoinStyle:(NSLineJoinStyle) js
{
	if( fc == nil && sc == nil )
		[NSException raise:NSInvalidArgumentException format:@"bad argument  
to [DKStyle styleWithFillColour:strokeColour:] - both colours are nil"];
	
	DKStyle* style = [[DKStyle alloc] init];
	
	if ( fc )
	{
		DKFill* fill = [DKFill fillWithColour:fc];
		[style addRenderer:fill];
	}
	
	if ( sc )
	{
		DKStroke* stroke = [DKStroke strokeWithWidth:sw colour:sc];
		[stroke setLineCapStyle:cs];
		[stroke setLineJoinStyle:js];
		[style addRenderer:stroke];
	}
	
	return [style autorelease];
}

might do the trick.  Anyway, just a suggestion.


On May 29, 2008, at 6:15 PM, Graham Cox wrote:

> The end cap is set up as a property of the DKStroke rasterizer,  
> which is part of the style. The end cap set on the object's path  
> will have no effect as the style takes priority.
>
> Depending on how you are setting up the style, you'll need to grab  
> the DKStroke component and set the line cap parameter there.
>
>
> cheers, Graham
>
>
>
>
> On 30 May 2008, at 8:08 am, Brad Larson wrote:
>
>> How do you style line end caps?  I don't see an entry in DKStyle  
>> for them.  Other places in the framework, lines are styled by  
>> styling the underlying NSBezierPath, but when I try
>>
>> [currentBezierPath moveToPoint:point1];
>> [currentBezierPath lineToPoint:point2];
>> [currentBezierPath setLineCapStyle:NSRoundLineCapStyle];
>> DKDrawablePath* currentPath = [[DKDrawablePath alloc]  
>> initWithBezierPath:currentBezierPath];
>>
>> during the programmatic generation of a path, the path does not  
>> seem to use the rounded cap style.  I'm just starting to get into  
>> the styles, so there may be something I'm missing.
>
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______________________
Brad Larson
SonoPlot, Inc.
3030 Laura Lane, Suite 120
Middleton, WI 53562