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.offset = offset_;
  24         self.scale = scale_;
  25         self.name = [[NSString alloc] initWithFormat: @"Axis %d", newIndex];
  26     }
  27     return self;
  28 }
  29
  30 - (id)findSubActionForValue:(IOHIDValueRef)value {
  31     int raw = IOHIDValueGetIntegerValue(value);
  32     float mag = offset + scale * raw;
  33     if (mag < -DEAD_ZONE)
  34         return self.children[0];
  35     else if (mag > DEAD_ZONE)
  36         return self.children[1];
  37     else
  38         return nil;
  39 }
  40
  41 - (void)notifyEvent:(IOHIDValueRef)value {
  42     int raw = IOHIDValueGetIntegerValue(value);
  43     magnitude = offset + scale * raw;
  44     [self.children[0] setActive:magnitude < -DEAD_ZONE];
  45     [self.children[1] setActive:magnitude > DEAD_ZONE];
  46 }
  47
  48 - (float)magnitude {
  49     return magnitude;
  50 }
  51
  52 @end