Classes/NJInputAnalog.m

   1 //
   2 //  NJInputAnalog.m
   3 //  Enjoy
   4 //
   5 //  Created by Sam McCall on 5/05/09.
   6 //
   7
   8 #define DEAD_ZONE 0.3
   9
  10 #import "NJInputAnalog.h"
  11
  12 static float normalize(CFIndex p, CFIndex min, CFIndex max) {
  13     return 2 * (p - min) / (float)(max - min) - 1;
  14 }
  15
  16 @implementation NJInputAnalog {
  17     CFIndex _rawMin;
  18     CFIndex _rawMax;
  19 }
  20
  21 - (id)initWithElement:(IOHIDElementRef)element
  22                 index:(int)index
  23                parent:(NJInputPathElement *)parent
  24 {
  25     if ((self = [super initWithName:NJINPUT_NAME(NSLocalizedString(@"axis %d", @"axis name"), index)
  26                                 eid:NJINPUT_DID("Axis", index)
  27                             element:element
  28                              parent:nil])) {
  29         self.children = @[[[NJInput alloc] initWithName:NSLocalizedString(@"axis low", @"axis low trigger")
  30                                                     eid:@"Low"
  31                                                    parent:self],
  32                           [[NJInput alloc] initWithName:NSLocalizedString(@"axis high", @"axis high trigger")
  33                                                     eid:@"High"
  34                                                    parent:self]];
  35         _rawMax = IOHIDElementGetPhysicalMax(element);
  36         _rawMin = IOHIDElementGetPhysicalMin(element);
  37     }
  38     return self;
  39 }
  40
  41 - (id)findSubInputForValue:(IOHIDValueRef)value {
  42     float mag = normalize(IOHIDValueGetIntegerValue(value), _rawMin, _rawMax);
  43     if (mag < -DEAD_ZONE)
  44         return self.children[0];
  45     else if (mag > DEAD_ZONE)
  46         return self.children[1];
  47     else
  48         return nil;
  49 }
  50
  51 - (void)notifyEvent:(IOHIDValueRef)value {
  52     float magnitude = self.magnitude = normalize(IOHIDValueGetIntegerValue(value), _rawMin, _rawMax);
  53     [self.children[0] setMagnitude:fabsf(MIN(magnitude, 0))];
  54     [self.children[1] setMagnitude:fabsf(MAX(magnitude, 0))];
  55     [self.children[0] setActive:magnitude < -DEAD_ZONE];
  56     [self.children[1] setActive:magnitude > DEAD_ZONE];
  57 }
  58
  59 @end