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FractControllerContrastG.j
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FractControllerContrastG.j
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/*
This file is part of FrACT10, a vision test battery.
Copyright © 2021 Michael Bach, bach@uni-freiburg.de, <https://michaelbach.de>
FractControllerContrastG.j: Gratings
Created by Bach on 2020-09-02
*/
@import "FractControllerContrast.j"
@implementation FractControllerContrastG: FractControllerContrast {
float periodInPixel;
BOOL isGratingColor, isErrorDiffusion;
float specialBcmFreq, specialBcmFreqPrevious;
int specialBcmCountAtStep, specialBcmCountAtStepError;
}
// Method of limits
const specialBcmStepsize = 0.1;
- (void) modifyDeviceStimulus { //console.info("FractControllerContrastG>modifyDeviceStimulus");
responseWasCorrectCumulative = responseWasCorrectCumulative && responseWasCorrect;
if (![Settings specialBcmOn]) return;
if (iTrial == 1) {
nTrials = 200;
alternativesGenerator = [[AlternativesGenerator alloc] initWithNumAlternatives: 2 andNTrials: nTrials obliqueOnly: [Settings gratingObliqueOnly]];
trialHistoryController = [[TrialHistoryController alloc] initWithNumTrials: nTrials];
specialBcmFreq = [Settings gratingCPDmin];
specialBcmFreqPrevious = 0; specialBcmCountAtStep = 1; specialBcmCountAtStepError = 0;
} else {
if (!responseWasCorrect) specialBcmCountAtStepError++;
if (specialBcmCountAtStepError >= 2) {
[self specialBcmDone];
} else {
specialBcmCountAtStep++;
if (specialBcmCountAtStep > 10) {
specialBcmFreqPrevious = specialBcmFreq;
specialBcmFreq *= Math.pow(10, specialBcmStepsize);
if (specialBcmFreq > [Settings gratingCPDmax]) {
[self specialBcmDone];
}
specialBcmCountAtStep = 1; specialBcmCountAtStepError = 0;
}
}
}
[super modifyDeviceStimulus];
}
- (void) specialBcmDone {
spatialFreqCPD = specialBcmFreqPrevious;
nTrials = iTrial - 1; iTrial = 9999;
gSpecialBcmDone = YES;
[self runEnd];
}
- (float) freqFromThresholderunits: (float) thresholderunit {
thresholderunit = 1 - thresholderunit; // 0: strong stimulus=low spatFreq
// exponential mapping for psychometric function to frequency. Does NOT work well.
/*const expFreqMin = Math.pow(10, [Settings gratingCPDmin]);
const expFreqMax = Math.pow(10, [Settings gratingCPDmax]);
const expFreq = expFreqMin + thresholderunit * (expFreqMax - expFreqMin);
return Math.log10(expFreq);*/
// linear mapping for psychometric function to frequency
const freqMin = [Settings gratingCPDmin], freqMax = [Settings gratingCPDmax];
const freq = freqMin + thresholderunit * (freqMax - freqMin);
return freq;
// log mapping for psychometric function to frequency
/* const logFreqMin = Math.log10([Settings gratingCPDmin]);
const logFreqMax = Math.log10([Settings gratingCPDmax]);
const logFreq = logFreqMin + thresholderunit * (logFreqMax - logFreqMin);
return Math.pow(10, logFreq);*/
}
- (void) gratingSineWithPeriodInPx: (float) periodInPx direction: (int) theDirection contrast: (float) contrast {
let s2 = Math.round(Math.max(viewHeight2, viewWidth2) / 2 * 1.3) * 2;
const trigFactor = 1 / periodInPx * 2 * Math.PI; // calculate only once
const notGratingSineNotSquare = ![Settings gratingSineNotSquare]
CGContextRotateCTM(cgc, -theDirection * 22.5 * Math.PI / 180);
CGContextSetLineWidth(cgc, 1.3); // still an artifact on oblique
let lFloat, lDiscrete, lError = 0;
for (let ix = -s2; ix <= s2; ++ix) {
lFloat = Math.sin((ix % periodInPx) * trigFactor);
if (notGratingSineNotSquare) lFloat = lFloat >= 0 ? 1 : -1; // sine → square wave grating
lFloat = 0.5 + 0.5 * contrast / 100 * lFloat; // contrast, map [-1, 1] → [0,1]
if (isGratingColor) {
CGContextSetStrokeColor(cgc, [gColorFore colorWithAlphaComponent: lFloat]);
} else {
lFloat = [MiscLight devicegrayFromLuminance: lFloat]; // gamma correction
lDiscrete = lFloat;
if (isErrorDiffusion) {
lFloat = lFloat * 255 + lError; // map → [0, 255], apply previous residual
lDiscrete = Math.round(lFloat); // discrete integer values [0, 255]
lError = lFloat - lDiscrete; // keep residual (what was lost by rounding)
lDiscrete /= 255; // remap → [0, 1]
}
CGContextSetStrokeColor(cgc, [CPColor colorWithWhite: lDiscrete alpha: 1]);
}
[optotypes strokeVLineAtX: ix y0: -s2 y1: s2];
}
}
- (void) drawStimulusInRect: (CGRect) dirtyRect forView: (FractView) fractView {
isGratingColor = [Settings isGratingColor];
isErrorDiffusion = [Settings gratingUseErrorDiffusion];
[self calculateForeBackColors];
if (isGratingColor) {
gColorFore = [Settings gratingForeColor]; gColorBack = [Settings gratingBackColor];
}
[self prepareDrawing];
if (!isGratingColor) {
CGContextSetFillColor(cgc, [CPColor colorWithWhite: [MiscLight devicegrayFromLuminance: 0.5] alpha: 1]);
CGContextFillRect(cgc, CGRectMake(-viewWidth2, +viewHeight2, viewWidth, -viewHeight));
}
switch(state) {
case kStateDrawBack: break;
case kStateDrawFore:
[self drawFixMark];
break;
case kStateDrawFore2:
if ([self isContrastG]) {
contrastMichelsonPercent = [MiscLight contrastMichelsonPercentFromLogCSWeber: stimStrengthInDeviceunits];
spatialFreqCPD = [Settings gratingCPD];
} else { // acuity_grating
contrastMichelsonPercent = [Settings gratingContrastMichelsonPercent];
spatialFreqCPD = [self freqFromThresholderunits: stimStrengthInThresholderUnits];
if ([Settings specialBcmOn]) {
spatialFreqCPD = specialBcmFreq;
}
}
periodInPixel = Math.max([MiscSpace periodInPixelFromSpatialFrequency: spatialFreqCPD], 2);
let dir = [alternativesGenerator currentAlternative];
if ([Settings isGratingMasked]) {
CGContextBeginPath(cgc);
const r = 0.5 * [MiscSpace pixelFromDegree: [Settings gratingDiaInDeg]];
CGContextAddEllipseInRect(cgc, CGRectMake(0 - r, 0 - r, 2 * r, 2 * r));
CGContextClosePath(cgc); CGContextClip(cgc);
}
[self gratingSineWithPeriodInPx: periodInPixel direction: dir contrast: contrastMichelsonPercent];
[self drawFixMark3];
trialInfoString = [self contrastComposeTrialInfoString];
break;
default: break;
}
[self embedInNoise];
[self drawTouchControls];
CGContextRestoreGState(cgc);
[super drawStimulusInRect: dirtyRect];
if ([self isContrastG]) {
[trialHistoryController setValue: contrastMichelsonPercent];
} else { // acuity_grating
[trialHistoryController setValue: spatialFreqCPD];
}
}
- (void) runStart { //console.info("FractControllerContrastLett>runStart");
nAlternatives = Math.min([Settings nAlternatives], 4);
nTrials = nAlternatives == 4 ? [Settings nTrials04] : [Settings nTrials02];
[super runStart];
[self setCurrentTestResultUnit: "MichelsonPercent"];
}
- (int) responseNumberFromChar: (CPString) keyChar { //console.info("FractControllerContrastE>responseNumberFromChar: ", keyChar);
switch (keyChar) {
case CPLeftArrowFunctionKey: return 4; // ⬅️
case CPRightArrowFunctionKey: return 4; // ➡️
case CPUpArrowFunctionKey: return 0; // ⬆️
case CPDownArrowFunctionKey: return 0; // ⬇️
case "1": return 6; // ↙️
case "2": return 0; // ⬇️
case "3": return 2; // ↘️
case "4": return 4; // ⬅️
case "5": return -1;
case "6": return 4; // ➡️
case "7": return 2; // ↖️
case "8": return 0; // ⬆️
case "9": return 6; // ↗️
}
return -2;// 0, 2, 4, 6: valid; -1: ignore; -2: invalid
}
- (CPString) contrastComposeTrialInfoString {
let s = "trial: " + iTrial + "/" + nTrials;
s += ", contrast: " + [Misc stringFromNumber: contrastMichelsonPercent decimals: 1 localised: YES] + "%";
s += ", frequency: " + [Misc stringFromNumber: spatialFreqCPD decimals: 2 localised: YES];
s += ", alternative: " + [alternativesGenerator currentAlternative];
return s;
}
- (CPString) contrastComposeResultString {
rangeLimitStatus = kRangeLimitOk;
// taking into account the result of final trial
stimStrengthInDeviceunits = [self stimDeviceunitsFromThresholderunits: [thresholder nextStim2apply]];
if ([self isContrastG]) {
contrastMichelsonPercent = [MiscLight contrastMichelsonPercentFromLogCSWeber: stimStrengthInDeviceunits];
spatialFreqCPD = [Settings gratingCPD];
} else { // acuity_grating
if (![Settings specialBcmOn]) {
spatialFreqCPD = [self freqFromThresholderunits: stimStrengthInThresholderUnits];
}
contrastMichelsonPercent = [Settings gratingContrastMichelsonPercent];
}
/* needs work for frequency sweep
if (contrastMichelsonPercent < 100 / 512) // 2 × 256
rangeLimitStatus = kRangeLimitValueAtFloor;
if (contrastMichelsonPercent >= 100)
rangeLimitStatus = kRangeLimitValueAtCeiling; */
let s = "Grating contrast: ";
s += [self rangeStatusIndicatorStringInverted: YES];
s += [Misc stringFromNumber: contrastMichelsonPercent decimals: 2 localised: YES];
s += "%, spatial frequency: ";
s += [Misc stringFromNumber: spatialFreqCPD decimals: 2 localised: YES];
s += " cpd";
return s;
}
- (CPString) contrastComposeExportString {
if ([[self parentController] runAborted]) return "";
let _exportString = [self generalComposeExportString];
_exportString += tab + "value" + tab + [Misc stringFromNumber: contrastMichelsonPercent decimals: 3 localised: YES];
_exportString += tab + "unit1" + tab + currentTestResultUnit
_exportString += tab + "distanceInCm" + tab + [Misc stringFromNumber: [Settings distanceInCM] decimals: 2 localised: YES];
_exportString += tab + "spatFreq" + tab + [Misc stringFromNumber: spatialFreqCPD decimals: 2 localised: YES];
_exportString += tab + "unit2" + tab + "cpd";
_exportString += tab + "nTrials" + tab + [Misc stringFromNumber: nTrials decimals: 0 localised: YES];
_exportString += tab + "rangeLimitStatus" + tab + rangeLimitStatus;
_exportString += tab + "crowding" + tab + 0; // does not apply, but let's not NaN this
if (isGratingColor) {
_exportString += tab + "colorForeBack" + tab + [gColorFore hexString] + tab + [gColorBack hexString];
if ([self isAcuityGrating]) {
_exportString += tab + "cpdMin" + tab + [Misc stringFromNumber: [Settings gratingCPDmin] decimals: 3 localised: YES];
_exportString += tab + "cpdMax" + tab + [Misc stringFromNumber: [Settings gratingCPDmax] decimals: 2 localised: YES];
}
}
return [self generalComposeExportStringFinalize: _exportString];
}
@end