sarabs
Member
Hi,
I am pretty new to iPhone and Obj-C. Just got XCode4 and sparrow framework setup.
I have a image (ball) which I would like to move along a circle of 2 cm (say) radius.
I don't want to have sprite of 6 balls and then show them one by one. Not sure what I am thinking is correct way.
I need some help to understand how to do it.
pixelrevision
Member
An easy way to do that is to nest it into a sprite and rotate the sprite.
// assumes container and ball are instance variables ball = [SPImage imageWithContentsOfFile:@"myBall.png"]; container = [[SPSprite alloc] init]; [self addChild:container]; [container addChild:ball]; ball.x = 100; // or however far from the center you want
Then in an enter frame loop you can update the rotation of the container:
container.rotation += SP_D2R(1);
If you don't want to deal with nested clips you can look at sin()/cos() to get the x and y positions based on distance and rotation:
http://gpwiki.org/index.php/VB:Tutorials:Rotating_A_Point_In_2D
Hope that helps.
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