X-Git-Url: https://git.yukkurigames.com/?p=enjoyable.git;a=blobdiff_plain;f=JSActionAnalog.m;h=9c98f21593c20c0bde263ff9148def7c2aff8a89;hp=7348e1968aff0ea713ac947696f598869a8bc196;hb=f563321aec9e13b8479ab3b890a9179f095a8b17;hpb=2fb801b58b29997f54443d9879d2e20ae8b169ad

diff --git a/JSActionAnalog.m b/JSActionAnalog.m
index 7348e19..9c98f21 100644
--- a/JSActionAnalog.m
+++ b/JSActionAnalog.m
@@ -5,31 +5,33 @@
 //  Created by Sam McCall on 5/05/09.
 //
 
-// TODO: Dead zone should be configurable per-device.
 #define DEAD_ZONE 0.3
 
 #import "JSActionAnalog.h"
 
+static float normalize(long p, long min, long max) {
+    return 2 * (p - min) / (float)(max - min) - 1;
+}
+
 @implementation JSActionAnalog {
     float magnitude;
+    long rawMin;
+    long rawMax;
 }
 
-@synthesize offset, scale;
-
-- (id)initWithIndex:(int)newIndex offset:(float)offset_ scale:(float)scale_ {
+- (id)initWithIndex:(int)index rawMin:(long)rawMin_ rawMax:(long)rawMax_ {
     if ((self = [super init])) {
+        self.name = [[NSString alloc] initWithFormat: @"Axis %d", index];
         self.children = @[[[JSAction alloc] initWithName:@"Low" base:self],
                           [[JSAction alloc] initWithName:@"High" base:self]];
-        self.offset = offset_;
-        self.scale = scale_;
-        self.name = [[NSString alloc] initWithFormat: @"Axis %d", newIndex];
+        rawMax = rawMax_;
+        rawMin = rawMin_;
     }
     return self;
 }
 
 - (id)findSubActionForValue:(IOHIDValueRef)value {
-    int raw = IOHIDValueGetIntegerValue(value);
-    float mag = offset + scale * raw;
+    float mag = normalize(IOHIDValueGetIntegerValue(value), rawMin, rawMax);
     if (mag < -DEAD_ZONE)
         return self.children[0];
     else if (mag > DEAD_ZONE)
@@ -39,8 +41,7 @@
 }
 
 - (void)notifyEvent:(IOHIDValueRef)value {
-    int raw = IOHIDValueGetIntegerValue(value);
-    magnitude = offset + scale * raw;
+    magnitude = normalize(IOHIDValueGetIntegerValue(value), rawMin, rawMax);
     [self.children[0] setActive:magnitude < -DEAD_ZONE];
     [self.children[1] setActive:magnitude > DEAD_ZONE];
 }