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#import "JOYAxes2D.h"
#import "JOYElement.h"
@interface JOYAxes2D()
@property unsigned rotation; // in 90 degrees units, clockwise
@end
@implementation JOYAxes2D
{
JOYElement *_element1, *_element2;
double _state1, _state2;
int32_t _initialX, _initialY;
int32_t _minX, _minY;
int32_t _maxX, _maxY;
}
+ (NSString *)usageToString: (JOYAxes2DUsage) usage
{
if (usage < JOYAxes2DUsageNonGenericMax) {
return inline_const(NSString *[], {
@"None",
@"Left Stick",
@"Right Stick",
@"Middle Stick",
@"Pointer",
})[usage];
}
if (usage >= JOYAxes2DUsageGeneric0) {
return [NSString stringWithFormat:@"Generic 2D Analog Control %d", usage - JOYAxes2DUsageGeneric0];
}
return [NSString stringWithFormat:@"Unknown Usage 2D Axes %d", usage];
}
- (NSString *)usageString
{
return [self.class usageToString:_usage];
}
- (uint64_t)uniqueID
{
return _element1.uniqueID | (uint64_t)self.combinedIndex << 32;
}
- (NSString *)description
{
return [NSString stringWithFormat:@"<%@: %p, %@ (%llx); State: %.2f%%, %.2f degrees>", self.className, self, self.usageString, self.uniqueID, self.distance * 100, self.angle];
}
- (instancetype)initWithFirstElement:(JOYElement *)element1 secondElement:(JOYElement *)element2
{
self = [super init];
if (!self) return self;
_element1 = element1;
_element2 = element2;
if (element1.usagePage == kHIDPage_GenericDesktop) {
uint16_t usage = element1.usage;
_usage = JOYAxes2DUsageGeneric0 + usage - kHIDUsage_GD_X + 1;
}
_initialX = 0;
_initialY = 0;
_minX = element1.max;
_minY = element2.max;
_maxX = element1.min;
_maxY = element2.min;
return self;
}
- (NSPoint)value
{
return NSMakePoint(_state1, _state2);
}
- (int32_t)effectiveMinX
{
int32_t rawMin = _element1.min;
int32_t rawMax = _element1.max;
if (_initialX == 0) return rawMin;
if (_minX <= (rawMin * 2 + _initialX) / 3 && _maxX >= (rawMax * 2 + _initialX) / 3 ) return _minX;
if ((_initialX - rawMin) < (rawMax - _initialX)) return rawMin;
return _initialX - (rawMax - _initialX);
}
- (int32_t)effectiveMinY
{
int32_t rawMin = _element2.min;
int32_t rawMax = _element2.max;
if (_initialY == 0) return rawMin;
if (_minX <= (rawMin * 2 + _initialY) / 3 && _maxY >= (rawMax * 2 + _initialY) / 3 ) return _minY;
if ((_initialY - rawMin) < (rawMax - _initialY)) return rawMin;
return _initialY - (rawMax - _initialY);
}
- (int32_t)effectiveMaxX
{
int32_t rawMin = _element1.min;
int32_t rawMax = _element1.max;
if (_initialX == 0) return rawMax;
if (_minX <= (rawMin * 2 + _initialX) / 3 && _maxX >= (rawMax * 2 + _initialX) / 3 ) return _maxX;
if ((_initialX - rawMin) > (rawMax - _initialX)) return rawMax;
return _initialX + (_initialX - rawMin);
}
- (int32_t)effectiveMaxY
{
int32_t rawMin = _element2.min;
int32_t rawMax = _element2.max;
if (_initialY == 0) return rawMax;
if (_minX <= (rawMin * 2 + _initialY) / 3 && _maxY >= (rawMax * 2 + _initialY) / 3 ) return _maxY;
if ((_initialY - rawMin) > (rawMax - _initialY)) return rawMax;
return _initialY + (_initialY - rawMin);
}
- (bool)updateState
{
int32_t x = [_element1 value];
int32_t y = [_element2 value];
if (x == 0 && y == 0) return false;
if (_initialX == 0 && _initialY == 0) {
_initialX = x;
_initialY = y;
}
double old1 = _state1, old2 = _state2;
{
int32_t value = x;
if (_initialX != 0) {
_minX = MIN(value, _minX);
_maxX = MAX(value, _maxX);
}
double min = [self effectiveMinX];
double max = [self effectiveMaxX];
if (min == max) return false;
_state1 = (value - min) / (max - min) * 2 - 1;
}
{
int32_t value = y;
if (_initialY != 0) {
_minY = MIN(value, _minY);
_maxY = MAX(value, _maxY);
}
double min = [self effectiveMinY];
double max = [self effectiveMaxY];
if (min == max) return false;
_state2 = (value - min) / (max - min) * 2 - 1;
}
if (_state1 < -1 || _state1 > 1 ||
_state2 < -1 || _state2 > 1) {
// Makes no sense, recalibrate
_state1 = _state2 = 0;
_initialX = _initialY = 0;
_minX = _element1.max;
_minY = _element2.max;
_maxX = _element1.min;
_maxY = _element2.min;
}
double temp = _state1;
switch (_rotation & 3) {
case 0: break;
case 1:
_state1 = -_state2;
_state2 = temp;
break;
case 2:
_state1 = -_state1;
_state2 = -_state2;
break;
case 3:
_state1 = _state2;
_state2 = -temp;
break;
}
return old1 != _state1 || old2 != _state2;
}
- (double)distance
{
return MIN(sqrt(_state1 * _state1 + _state2 * _state2), 1.0);
}
- (double)angle
{
double temp = atan2(_state2, _state1) * 180 / M_PI;
if (temp >= 0) return temp;
return temp + 360;
}
@end
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