import MathLight from './MathLight'

var cameraLight = {
    clampVFOV: function (currentFov, maxHFov, width, height) {
        //限制currentFov, 使之造成的横向fov不大于指定值maxHFov
        var r = cameraLight.getHFOVFromVFOV(currentFov, width, height)
        return r > maxHFov ? cameraLight.getVFOVFromHFOV(maxHFov, width, height) : currentFov
    },
    getHFOVForCamera: function (camera, width, height) {
        return cameraLight.getHFOVFromVFOV(camera.fov, width, height)
    },
    getHFOVFromVFOV: function (fov, width, height) {
        return 2 * Math.atan(Math.tan((fov * MathLight.RADIANS_PER_DEGREE) / 2) * (width / height)) * MathLight.DEGREES_PER_RADIAN
    },
    getVFOVFromHFOV: function (fov, width, height) {
        return 2 * Math.atan(Math.tan((fov * MathLight.RADIANS_PER_DEGREE) / 2) * (height / width)) * MathLight.DEGREES_PER_RADIAN
    },
    /* clampVFOV: function(fov, t, i, n) {
        var r = cameraLight.getHFOVFromVFOV(fov, i, n);
        return r > t ? cameraLight.getVFOVFromHFOV(t, i, n) : fov
    },
    getHFOVForCamera: function(e, t, i) {
        return cameraLight.getHFOVFromVFOV(e.fov, t, i)
    },
    getHFOVFromVFOV: function(fov, t, i) {
        var n = t
            , o = i
            , a = 2 * Math.atan(Math.tan(fov * MathLight.RADIANS_PER_DEGREE / 2) * (n / o)) * MathLight.DEGREES_PER_RADIAN;
        return a
    },
    getVFOVFromHFOV: function(e, t, i) {
        var n = t
            , o = i
            , a = 2 * Math.atan(Math.tan(e * MathLight.RADIANS_PER_DEGREE / 2) * (o / n)) * MathLight.DEGREES_PER_RADIAN;
        return a
    } */
}

export default cameraLight