SameBoy/JoyKit/JOYAxis.m

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#import "JOYAxis.h"
#import "JOYElement.h"
@implementation JOYAxis
{
JOYElement *_element;
double _state;
double _min;
}
+ (NSString *)usageToString: (JOYAxisUsage) usage
{
if (usage < JOYAxisUsageNonGenericMax) {
return (NSString *[]) {
@"None",
@"Analog L1",
@"Analog L2",
@"Analog L3",
@"Analog R1",
@"Analog R2",
@"Analog R3",
@"Wheel",
@"Rudder",
@"Throttle",
@"Accelerator",
@"Brake",
}[usage];
}
if (usage >= JOYAxisUsageGeneric0) {
return [NSString stringWithFormat:@"Generic Analog Control %d", usage - JOYAxisUsageGeneric0];
}
return [NSString stringWithFormat:@"Unknown Usage Axis %d", usage];
}
- (NSString *)usageString
{
return [self.class usageToString:_usage];
}
- (uint64_t)uniqueID
{
return _element.uniqueID;
}
- (NSString *)description
{
return [NSString stringWithFormat:@"<%@: %p, %@ (%llu); State: %f%%>", self.className, self, self.usageString, self.uniqueID, _state * 100];
}
- (instancetype)initWithElement:(JOYElement *)element
{
self = [super init];
if (!self) return self;
_element = element;
if (element.usagePage == kHIDPage_GenericDesktop) {
uint16_t usage = element.usage;
_usage = JOYAxisUsageGeneric0 + usage - kHIDUsage_GD_X + 1;
}
_min = 1.0;
return self;
}
- (double) value
{
return _state;
}
- (bool)updateState
{
double min = _element.min;
double max = _element.max;
if (min == max) return false;
double old = _state;
double unnormalized = ([_element value] - min) / (max - min);
if (unnormalized < _min) {
_min = unnormalized;
}
if (_min != 1) {
_state = (unnormalized - _min) / (1 - _min);
}
return old != _state;
}
@end