A fast, easy to use, free, and community supported 2D game engine
malaki1974
Member
Hello,
Outstanding framework and I am only just delving in. For a demo-need I have for a client I need something very simple. If successful the real work beings after that. The demomashup has many things going on and I was wondering if there existed a simple version of the hello world example with gestures added for rotating, and pinching and zooming? Nothing more, nothing less.
Thank you
malaki1974
Member
Well I did this to make it rotate only on one axis. Not sure of it is the right way to do it but it works.
-(void) rotate: (SpinningNode*) aNode fromSwipeVelocity: (CGPoint) swipeVelocity {
// The 2D rotation axis is perpendicular to the drag velocity.
CGPoint axis2d = ccpPerp(swipeVelocity);
// Project the 2D rotation axis into a 3D axis by mapping the 2D X & Y screen
// coords to the camera's rightDirection and upDirection, respectively.
CC3Camera* cam = self.activeCamera;
aNode.spinAxis = CC3VectorAdd(CC3VectorScaleUniform(cam.upDirection, axis2d.x),
CC3VectorScaleUniform(cam.upDirection, axis2d.y));
// Set the spin speed from the scaled drag velocity.
aNode.spinSpeed = ccpLength(swipeVelocity) * kSwipeVelocityScale;
// Mark the spinning node as free-wheeling, so that it will start spinning.
aNode.isFreeWheeling = YES;
}
The SpinningNode may be more complicated than you need. It is designed to rotate in all directions, and to continue spinning with inertia after the gesture is complete.
If all you need to do is rotate a node while the user is dragging (a more typical action), you can just take, say the X-component of the gesture movement, and use it to set the change in the Y-component of the rotation property, or the rotateBy: method.
...Bill
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