35 lines
1.1 KiB
JavaScript
35 lines
1.1 KiB
JavaScript
const util = {
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getGyroPermission: () => {
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if(!DeviceOrientationEvent.requestPermission) {
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return Promise.resolve("granted")
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} else{
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return DeviceOrientationEvent.requestPermission()
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}
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},
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round: (x, decimalPlaces) =>
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Math.round(x * Math.pow(10, decimalPlaces)) / Math.pow(10, decimalPlaces),
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// parameters in radians
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// return values in radians
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toPolarCoordinates: (alpha, beta, gamma) => {
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const rz = m3.zRotation(alpha);
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const rx = m3.xRotation(beta);
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const ry = m3.yRotation(gamma);
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const rot = m3.mul(rz, m3.mul(rx, ry));
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const screenNormal = m3.mulV(rot, [0, 0, 1]);
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const phi = Math.atan2(screenNormal[1], screenNormal[0]);
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const r = v3.norm2(screenNormal);
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// theta ∈ [0, π]
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// where 0 is lying flat and π is upside down
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const theta = Math.acos(screenNormal[2] / r);
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return [screenNormal, phi, theta];
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},
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rgb: (r, g, b) => `rgb(${255 * r}, ${255 * g}, ${255 * b})`,
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rgba: (r, g, b, a) => `rgb(${255 * r}, ${255 * g}, ${255 * b}, ${a})`,
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deg2rad: (deg) => deg / 180 * Math.PI,
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diffAngles: (a, b) => Math.atan2(Math.sin(b - a), Math.cos(b - a)),
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};
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