8000 Fix tilt to sperical calculation. by mustaqahmed · Pull Request #324 · w3c/pointerevents · GitHub
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Fix tilt to sperical calculation. #324

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merged 1 commit into from
Jul 13, 2020
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Fix tilt to sperical calculation. #324

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38 changes: 15 additions & 23 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -1254,31 +1254,25 @@ <h2>Converting between <code>tiltX</code> / <code>tiltY</code> and <code>altitud
let tiltXrad = tiltX * Math.PI/180;
let tiltYrad = tiltY * Math.PI/180;

// calculate azimuth angle
let azimuthAngle = 0;

if(tiltXrad == 0){
if(tiltYrad &gt; 0){
if(tiltX == 0){
if(tiltY &gt; 0){
azimuthAngle = Math.PI/2;
}
else if(tiltYrad &lt; 0){
else if(tiltY &lt; 0){
azimuthAngle = 3*Math.PI/2;
}
}

if(tiltYrad == 0){
if(tiltXrad &lt; 0){
} else if(tiltY == 0){
if(tiltX &lt; 0){
azimuthAngle = Math.PI;
}
}

if(Math.abs(tiltXrad) == Math.PI/2){
} else if(Math.abs(tiltX) == 90 || Math.abs(tiltY) == 90){
// not enough information to calculate azimuth
azimuthAngle = 0;
}


if(tiltXrad != 0 && tiltYrad != 0 &&
Math.abs(tiltXrad) != Math.PI/2 && Math.abs(tiltYrad) != Math.PI/2){
} else {
// Non-boundary case: neither tiltX nor tiltY is equal to 0 or +-90
let tanX = Math.tan(tiltXrad);
let tanY = Math.tan(tiltYrad);

Expand All @@ -1288,19 +1282,17 @@ <h2>Converting between <code>tiltX</code> / <code>tiltY</code> and <code>altitud
}
}

// calculate altitude angle
let altitudeAngle = 0;

if (Math.abs(tiltXrad) == Math.PI/2){
if (Math.abs(tiltX) == 90 || Math.abs(tiltY) == 90){
altitudeAngle = 0
}
else if (tiltXrad == 0){
} else if (tiltX == 0){
altitudeAngle = Math.PI/2 - Math.abs(tiltYrad);
}
else if(tiltYrad == 0){
} else if(tiltY == 0){
altitudeAngle = Math.PI/2 - Math.abs(tiltXrad);
}

if(tiltXrad != 0 && tiltYrad != 0 && Math.abs(tiltXrad) != Math.PI/2){
} else {
// Non-boundary case: neither tiltX nor tiltY is equal to 0 or +-90
altitudeAngle = Math.atan(1.0/Math.sqrt(Math.pow(Math.tan(tiltXrad),2) + Math.pow(Math.tan(tiltYrad),2)));
}

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