Core Animation using layers would make this simpler for you, I think.
You can still get the click from the layer backed view, but then add
your image to the view's layer tree as a layer. Animating a layer is
trivial in CA.
I did a blog post on how to animate a layer to the clicked point in
the view. Shows you how to get the current location on the view while
in-flight as well. http://www.cimgf.com/2008/11/05/core-animation-tutorial-interrupting-animation-progress/
. The layer that I animate in the post demo project doesn't have an
image in it, but just look at setting the contents field in the layer
(CALayer docs) and you'll have what you need.
This probably won't help you if you need to stick with NSAnimation,
but et me know if you have CA questions.
-Matt
On Nov 26, 2008, at 7:51 AM, Hrishikesh Muruk wrote:
I have a basic question about using NSAnimation. Here is what I am
trying to do: My program shows a custom view and I want to animate
an NSImage within that custom view. When the mouse is clicked within
the program I want to move (animate) the image to a new point in the
window.
I have subclassed NSAnimation into MyAnim and I have overloaded the
method "-(void)setCurrentProgress:(NSAnimationProgress)progress". My
program is organized in this fashion.
I have a custom view class MyView which has pointers to my data
objects (an NSImage in this case) and my animation object myAnim. It
also has a pointer to my custom view object MyView.
On a mouse click I send the message
[myAnim startAnimation];
@interface MyView : NSView {
NSImage *myObj;
MyAnim *myAnim;
}
I want the animation to begin when the mouse is clicked so I have
overloaded the "-mouseDown" method to call [myAnim startAnimation];.
I plan to animate my image by changing its position from within -
setCurrentProgress. My problem - how do I access myObj from within
the method -setCurrentProgress (which is inside MyAnim). I could do
something like:
(in file MyAnim.m)
-(void)setCurrentProgress:(NSAnimationProgress)progress {
NSImage * tmpImg = [super valueForKey:@"myObj"];
}
But it looks a little bit like a hack.
My questions:
1. Is there a better way to access myObj from MyAnim?
2. Once I change the position of myObj how do I get the view to
redraw the image?
Hrishi
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