javascript – Google街景放大缩放至Fov

我需要完全按用户选择保存街景图像(包括panoID,航向,俯仰和fov).我有以下代码：

            panorama = new google.maps.StreetViewPanorama(document.getElementById('pano'));
            panorama.addListener('pano_changed', function () {
                $('#panoID').val(panorama.getPano());
            });
            panorama.addListener('pov_changed', function () {
                $('#heading').val(panorama.getPov().heading);
                $('#pitch').val(panorama.getPov().pitch);
                $('#fov').val(panorama.getZoom());
            });

问题是我想将缩放保存为fov值
https://developers.google.com/maps/documentation/streetview/intro(看看fov可选参数)

fov (default is 90) determines the horizontal field of view of the image. The field of view is expressed in degrees, with a maximum allowed value of 120. When dealing with a fixed-size viewport, as with a Street View image of a set size, field of view in essence represents zoom, with smaller numbers indicating a higher level of zoom.

我找到了一些“转换”信息
https://developers.google.com/maps/documentation/javascript/streetview#TilingPanoramas

但它告诉我,fov可以到180,但是上一个.链接告诉120值是最大值.为什么？
当然,我可以找到转换的比率,但也许存在正常的方式(即全景返回Fov而不是缩放)？

而且,似乎,捕捉放大pov_changed不是最好的方法.有时缩放不能正确更新

解决方法:

找到以下函数从zoom转换为FOV：

var k = Math.pow(0.5051, zoom);
var fov = 103.7587 * k;

它的工作原理(几乎完全):)

添加

更精确的结果：

var fov = 180 / Math.pow(2,zoom) 

感谢trungk18

标签：javascript,google-maps,google-maps-api-3,google-street-view
来源： https://codeday.me/bug/20190528/1167714.html