Gami,
I assume that you have some way of knowing which device any given set
of coordinates are from. You need to combine this information with
your previous location data.
It sounds like you are doing this:
xy = coordinateFromSomeDevice()
draw line from prevXY to xy
prevXY = xy
With multiple devices you will get very weird results as xy keeps
jumping from one device to another. Instead do something along these
lines:
deviceIdx = indexOfSomeDevice()
xy = coordinateFromSomeDevice()
draw line from prevXY[deviceIdx] to xy
prevXY[deviceIdx] = xy
Exactly how you want to store each devices prev location is up to you
and my pseudo code above makes many assumptions for simplicity.
Note: Do not draw outside of your view's drawRect: method. Use the
setNeedsDisplayInRect: and drawRect: methods as intended and described
here:
http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaDrawingGuide/Introduction/chapter_1_section_1.html
-raleigh
On Jan 19, 2009, at 10:35 PM, Gami Ravi wrote:
Hi Graham,
Thanks for your answer.
Let me explain current scenario.
I have two input device from which i am getting raw coordinates(x,y).
When there is only one device i can draw paths using x,y
coordinates. All things are working fine.
Now if user writes using two input device on one surface
simultaeously then it should draw two individual path depending on
(x,y) coordinates from different input device.
so what is your inputs on this situation?
Thanks & Regards,
Ravi.
----- Original Message ----- From: "Graham Cox" <graham....@bigpond.com
>
To: "Gami Ravi" <ravi.g...@einfochips.com>
Cc: <cocoa-dev@lists.apple.com>
Sent: Tuesday, January 20, 2009 11:56 AM
Subject: Re: draw two strokes(lines) simultaneousy on NSView
On 20 Jan 2009, at 5:12 pm, Gami Ravi wrote:
I want to create an application that will draws two strokes
simultaneously on NSView. How can i draw two strokes
simultaneously ?
Any help would be appreciated.
You don't say what you want to stroke, but let's assume a
NSBezierPath.
// ...set up stroke parameters for stroke 1 here ...
[path stroke];
// ...set up stroke parameters for stroke 2 here...
[path stroke];
In other words, you just draw one stroke then the other.
If you really want to stroke two lines or other paths
"simultaneously" (not sure what you mean by that either - nothing
is truly simultaneous), then you can combine paths into one bezier
path object and stroke it all at once. However, you can't apply
separate stroke parameters to different parts of the path this way.
--Graham
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