Re: Drawing polygons and keeping a list of them...
Re: Drawing polygons and keeping a list of them...
- Subject: Re: Drawing polygons and keeping a list of them...
- From: "John C. Randolph" <email@hidden>
- Date: Mon, 25 Apr 2005 15:26:49 -0700
On Apr 25, 2005, at 11:06 AM, Brian O'Brien wrote:
I am writing an application that will need to draw polygons on top
of images.
There may be multiple polygons on an image.
What container do you recommend I use to:
a) hold the points of each polygon.
See NSBezierPath.
b) hold the list of polygons.
See NSArray/NSMutableArray.
Another question I have is more of a GUI nature than a programatic
one...
Every time a user clicks on the image a new point is added to the
current polygon.
How then should I 'close' the polygon? Should the user press the
escape key or
right mouse button? I need to know somehow that the user is
finished drawing this
polygon and is going on to draw the next polygon.
The most common approach I've seen is to terminate using a double-click.
-jcr
John C. Randolph <email@hidden> (408) 974-8819
Sr. Cocoa Software Engineer,
Apple Worldwide Developer Relations
http://developer.apple.com/cocoa/index.html
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden