JSActionAnalog.m

   1 //
   2 //  JSActionAnalog.m
   3 //  Enjoy
   4 //
   5 //  Created by Sam McCall on 5/05/09.
   6 //
   7
   8 // TODO: Dead zone should be configurable per-device.
   9 #define DEAD_ZONE 0.3
  10
  11 #import "JSActionAnalog.h"
  12
  13 @implementation JSActionAnalog {
  14     float magnitude;
  15 }
  16
  17 @synthesize offset, scale;
  18
  19 - (id)initWithIndex:(int)newIndex offset:(float)offset_ scale:(float)scale_ {
  20     if ((self = [super init])) {
  21         self.children = @[[[JSAction alloc] initWithName:@"Low" base:self],
  22                           [[JSAction alloc] initWithName:@"High" base:self]];
  23         self.index = newIndex;
  24         self.offset = offset_;
  25         self.scale = scale_;
  26         self.name = [[NSString alloc] initWithFormat: @"Axis %d", self.index];
  27     }
  28     return self;
  29 }
  30
  31 - (id)findSubActionForValue:(IOHIDValueRef)value {
  32     int raw = IOHIDValueGetIntegerValue(value);
  33     float mag = offset + scale * raw;
  34     if (mag < -DEAD_ZONE)
  35         return self.children[0];
  36     else if (mag > DEAD_ZONE)
  37         return self.children[1];
  38     else
  39         return nil;
  40 }
  41
  42 - (void)notifyEvent:(IOHIDValueRef)value {
  43     int raw = IOHIDValueGetIntegerValue(value);
  44     magnitude = offset + scale * raw;
  45     [self.children[0] setActive:magnitude < -DEAD_ZONE];
  46     [self.children[1] setActive:magnitude > DEAD_ZONE];
  47 }
  48
  49 - (float)magnitude {
  50     return magnitude;
  51 }
  52
  53 @end