Ok I got something similar to what I want..
@ glenn I see the "180 rotation when first move" still happens any idea?
her eis the code now
CGPoint Location = [[touches anyObject] locationInView:self];
CGPoint p = [self convertPoint:self.center
fromView:self.superview];
int x = p.x;
int y = p.y;
float dx = Location.x - x;
float dy = Location.y - y;
//CGPoint p1 = [aTouch locationInView:self];
//CGPoint distance = CGPointDelta(firstTouchPoint,[aTouch
locationInView:self]);
//atan2(p1.y - firstTouchPoint.y, p1.x - firstTouchPoint.x)
double a = atan2(-dx,dy);
//CGFloat a = atan2(p1.y - firstTouchPoint.y, p1.x -
firstTouchPoint.x);
rotating = YES;
//Now im gonna chekc if I should enlarge
CGFloat newDistFromCenter = [self
getCurrentDistanceFromCenter:aTouch];
CGFloat deltaCenter = newDistFromCenter - dist;
// Get distance between points
CGFloat currentDistance =
distanceBetweenPoints(firstTouchPoint,Location);
CGFloat previousDistance =
distanceBetweenPoints(firstTouchPoint,[aTouch
previousLocationInView:self]);
// Figure new scale
CGFloat distanceRatio = currentDistance/previousDistance;
if(0.5 <= distanceRatio && distanceRatio <= 1.3){
NSLog(@"current %f, Previous %f, Ratio %f",
currentDistance,
previousDistance, distanceRatio);
bc_selectedItem.transform =
CGAffineTransformScale(bc_selectedItem.transform,distanceRatio,
distanceRatio);
CGRect b = self.bounds;
b.size.width += deltaCenter;
b.size.height += deltaCenter;
self.bounds = b;
dist = newDistFromCenter;
}
self.transform= CGAffineTransformRotate(self.transform, a);
bc_selectedItem.transform =
CGAffineTransformRotate(bc_selectedItem.transform, a);
actualAngle = a;
firstTouchPoint = p;
[self setNeedsDisplay];
Thanks in Advance
Gustavo
On Thu, Dec 2, 2010 at 5:08 PM, Gustavo Adolfo Pizano
<gustavxcodepic...@gmail.com> wrote:
> glenn thanks... thats solves one preoblem I had no idea why was that..
>
> Now im trying for the second problem the following:
>
> CGFloat currentDistance = distanceBetweenPoints(firstTouchPoint,p);
> CGFloat previousDistance = distanceBetweenPoints(p,[aTouch
> previousLocationInView:self]);
>
> // Figure new scale
>
> CGFloat distanceRatio = currentDistance / previousDistance;
> NSLog(@"current %f, Previous %f, Ratio %f", currentDistance,
> previousDistance, distanceRatio);
>
>
> where firstTouchPoint is where touchesBegan point started, and p is
> the current point in the touchesmoved,
>
> Its working but scaling down when it should scale up and vice versa.
>
> G.
>
> On Thu, Dec 2, 2010 at 4:41 PM, glenn andreas <gandr...@mac.com> wrote:
>>
>> On Dec 2, 2010, at 9:37 AM, Gustavo Adolfo Pizano wrote:
>>> now in my touches moved I do the following, the first part applies a
>>> rotation, which is working properly, except that after the first move
>>> the angle is 180 from what the view has, so you see that the view
>>> turns 180 degrees!!,
>>
>>> CGFloat a = atan2(-dx,dy);
>>
>>
>>
>> atan2's parameters are declared as:
>>
>> double atan2(double y, double x);
>>
>>
>>
>>
>> Glenn Andreas gandr...@gandreas.com
>> The most merciful thing in the world ... is the inability of the human mind
>> to correlate all its contents - HPL
>>
>>
>
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