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
  15 @synthesize offset, scale;
  16
  17 - (id)initWithIndex:(int)newIndex offset:(float)offset_ scale:(float)scale_ {
  18     if ((self = [super init])) {
  19         self.subActions = @[[[SubAction alloc] initWithIndex:0 name:@"Low" base:self],
  20                             [[SubAction alloc] initWithIndex:1 name:@"High" base:self]];
  21         self.index = newIndex;
  22         self.offset = offset_;
  23         self.scale = scale_;
  24         self.name = [[NSString alloc] initWithFormat: @"Axis %d", self.index + 1];
  25     }
  26     return self;
  27 }
  28
  29 - (id)findSubActionForValue:(IOHIDValueRef)value {
  30     int raw = IOHIDValueGetIntegerValue(value);
  31     float parsed = [self getRealValue:raw];
  32
  33     if (parsed < -DEAD_ZONE)
  34         return self.subActions[0];
  35     else if (parsed > DEAD_ZONE)
  36         return self.subActions[1];
  37     else
  38         return nil;
  39 }
  40
  41 - (void)notifyEvent:(IOHIDValueRef)value {
  42     int raw = IOHIDValueGetIntegerValue(value);
  43     float parsed = [self getRealValue:raw];
  44     [self.subActions[0] setActive:parsed < -DEAD_ZONE];
  45     [self.subActions[1] setActive:parsed > DEAD_ZONE];
  46 }
  47
  48 - (float)getRealValue:(int)value {
  49     return offset + scale * value;
  50 }
  51
  52
  53 @end