Andrew Nesbitt
57 linhas
2.2 KiB
JavaScript
57 linhas
2.2 KiB
JavaScript
/*
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* gamepad-calibration for the nodecopter-gamepad module.
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*
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* calibration is initialized with:
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*
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* nodecopter.initCalibrators([
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* { min: -1, max: 1, center: 0 }, // left-x
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* { min: -1, max: 1, center: 0 }, // left-y
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* { min: -1, max: 1, center: 0 }, // right-x
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* { min: -1, max: 1, center: 0 } // right-y
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* ]);
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*
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* where min/max/center values are observed values from the gamepad for the maximum values.
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* After initialization, calibrated values can be retrieved with:
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*
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* var leftX = nodecopter.getCalibratedValue(gamepad.axes, AXES.LEFT_ANALOGUE_HOR);
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*
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* @author Martin Schuhfuss <m.schuhfuss@gmail.com>
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*/
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(function(exports) {
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"use strict";
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var calibrators = [];
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// creates a calibration-function for each of the calibration-datasets
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exports.initCalibrators = function(calibrationData) {
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return calibrators = calibrationData.map(function(cd) {
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// intercept invalid calibration-data, ensure that `min < center < max`
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if(cd.min >= cd.center) { throw new Error('invalid calibration-data (min >= center)'); }
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if(cd.max <= cd.center) { throw new Error('invalid calibration-data (max <= center)'); }
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var negDelta = Math.abs(cd.center - cd.min),
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posDelta = Math.abs(cd.center - cd.max),
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negScaling = 1/negDelta,
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posScaling = 1/posDelta;
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// the calibration-function calculates calibrated output-values from raw-inputs, clipped to range [-1, 1]
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return function(rawValue) {
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var centerOffset = rawValue - cd.center;
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if(centerOffset < 0) {
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return Math.max(-1, centerOffset * negScaling);
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} else if(centerOffset > 0) {
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return Math.min(1, centerOffset * posScaling);
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} else { return 0.0; }
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};
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});
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};
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exports.getCalibratedValue = function(axesData, axisId) {
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var rawValue = axesData[axisId];
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if(!calibrators[axisId]) { return rawValue; }
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return calibrators[axisId](rawValue);
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};
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}((typeof exports === 'undefined')? (this.nodecopterGamepad = this.nodecopterGamepad||{}) : exports)); |