iphone - Xcode Rotate image torwads a CGPoint without transform -


i made app: got image , follows finger ever moving it. want rotate towards cgpoint.

i tested things , when tried @ first transform image jumped original position, rotated , continued following finger.

how rotate without transform (or if know how fix said it's good) ?

my code = 

//this called every 0.01 seconds cgpoint center = self.im.center; if (!cgpointequaltopoint(self.im.center, i)) {     x = center.x;     y = center.y;     double distance = sqrtf(powf(i.x - x, 2) + powf(i.y - y, 2));     float speedx = (2 * (i.x - x)) / distance;     float speedy = (2 * (i.y - y)) / distance;     //float degree = (angle) % 360;      //self.im.center = cgpointmake(center.x+speedx, center.y+speedy);     cgaffinetransform translate = cgaffinetransformmaketranslation(center.x+speedx,     center.y+speedy);     cgaffinetransform rotate = cgaffinetransformmakerotation(angle);     [self.im settransform:cgaffinetransformconcat(rotate, translate)]; }     -(void)touchesmoved:(nsset *)touches withevent:(uievent *)event {     uitouch *touch = [touches anyobject];     = [touch locationinview:self.view];     angle = atan2f(self.im.center.y-i.y, self.im.center.x-i.x);     //[self.im settransform:cgaffinetransformrotate(self.im.transform, angle)];  } -(void)touchesbegan:(nsset *)touches withevent:(uievent *)event {     uitouch *touch = [touches anyobject];     i=[touch locationinview:self.view];     angle = atan2f(self.im.center.y-i.y, self.im.center.x-i.x); }

you can apply number of transformations image view cgaffinetransformconcat. like:

cgaffinetransform translate = cgaffinetransformmaketranslation(dx, dy); cgaffinetransform rotate = cgaffinetransformmakerotation(angle); [yourimageview settransform:cgaffinetransformconcat(rotate, translate)];

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