谷歌街景缩放到Fov [英] Google Street View zoom to Fov

问题描述

我需要按照用户所选的方式（包括panoID，标题，音高和fov）保存街景视图图像。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（））; 
}）; 
  

问题是我想将缩放比例保存为fov值

但它告诉我们，fov可以达到180，但是prev。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）？

另外，似乎catch抓拍在pov_changed不是最好的方法。有时缩放无法正确更新

解决方案

发现以下功能可将缩放转换为FOV：

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

它的工作原理（几乎完全）：）

ADDED

更确切的结果：

  var fov = 180 / Math.pow（2，缩放）
  

感谢trungk18 p>

I need to save Street view image exactly as user selected (including panoID, heading, pitch and fov). I have the following code:

            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());
            });

problem is I want to save zoom as fov value https://developers.google.com/maps/documentation/streetview/intro (look at fov optional parameter)

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.

I found some "convertation" information https://developers.google.com/maps/documentation/javascript/streetview#TilingPanoramas

but it tells, that fov can be till 180, but prev. link tells 120 value is maximum. Why? Of course, I can find ratio for convertation, but maybe exists normal way (i.e. panorama returns Fov instead of zoom)?

Also, seems, catch zoom in pov_changed is not the best way. Sometimes zoom is not updated properly

解决方案

Found the following function to convert from zoom to FOV:

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

it works (almost exactly) :)

ADDED

more precise results:

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

thanks to trungk18

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