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(long p, long min, long max) {
  13     return 2 * (p - min) / (float)(max - min) - 1;
  14 }
  15
  16 @implementation NJInputAnalog {
  17     long rawMin;
  18     long rawMax;
  19 }
  20
  21 - (id)initWithIndex:(int)index rawMin:(long)rawMin_ rawMax:(long)rawMax_ {
  22     NSString *name = [[NSString alloc] initWithFormat:NSLocalizedString(@"axis %d", @"axis name"), index];
  23     NSString *did = [[NSString alloc] initWithFormat:@"Axis %d", index];
  24     if ((self = [super initWithName:name did:did base:nil])) {
  25         self.children = @[[[NJInput alloc] initWithName:NSLocalizedString(@"axis low", @"axis low trigger")
  26                                                     did:@"Low"
  27                                                    base:self],
  28                           [[NJInput alloc] initWithName:NSLocalizedString(@"axis high", @"axis high trigger")
  29                                                     did:@"High"
  30                                                    base:self]];
  31         rawMax = rawMax_;
  32         rawMin = rawMin_;
  33     }
  34     return self;
  35 }
  36
  37 - (id)findSubInputForValue:(IOHIDValueRef)value {
  38     float mag = normalize(IOHIDValueGetIntegerValue(value), rawMin, rawMax);
  39     if (mag < -DEAD_ZONE)
  40         return self.children[0];
  41     else if (mag > DEAD_ZONE)
  42         return self.children[1];
  43     else
  44         return nil;
  45 }
  46
  47 - (void)notifyEvent:(IOHIDValueRef)value {
  48     float magnitude = self.magnitude = normalize(IOHIDValueGetIntegerValue(value), rawMin, rawMax);
  49     [self.children[0] setMagnitude:fabsf(MIN(magnitude, 0))];
  50     [self.children[1] setMagnitude:fabsf(MAX(magnitude, 0))];
  51     [self.children[0] setActive:magnitude < -DEAD_ZONE];
  52     [self.children[1] setActive:magnitude > DEAD_ZONE];
  53 }
  54
  55 @end