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