heading

问题 Is it possible in Mapbox GL JS to get the users bearing? I would like to show the direction in which the user is facing, to assist them in navigating to nearby POI. I understand that it is possible to set the bearing of the map and also get the current bearing of it, but i need the actual real life bearing of the user. Kind of the same thing as on Google Maps: The service is intended to run as an Ionic app on iOS and Android, and the assistance in bearing is a key feature in helping them

问题 this seems like such a simple problem but I have been unable to find an answer (and im no good at math). I am trying to move a UIView to a new CGPoint X distance away along a certain heading. What is the formula for determining the new coordinates? (i do no want this to be animated, just an instantaneous move) something like: x = 100; (current x value) y = 150; (current y value) d = 25; (distance to move the point) h = 90; (west) \\\ insert formula to determine new x,y coords self.car.center

问题 So, I need to achieve a really nice fade reveal text effect. Imagine a H1 that's spread across two lines. The text would need to reveal up from the base of each line. However I'm unsure of how to do this with multi-lined text (that isn't split into separate heading tags). Here's one I created already, however this fades everything from the bottom. Ideally I want each line to fade up from its own row. setTimeout(function(){ $('.ready').addClass('active'); }, 1500); .overflow-hidden { overflow

问题 I am using the tkinter Treeview widget to show a database. The command when clicking on one of the headings is used for sorting the table based on the clicked column. Additionally I want a tooltip box show up as soon as I hover (or right click) over one of the headings. The tooltips aren't a problem for other widgets but the heading of a treeview isn't a full widget of course. How can I bind any action to the headings except for the usual command? 回答1: You can bind the events to the treeview

问题 I have seen a few examples of this but am not sure exactly how to implement it, (such as iPhone Compass GPS Direction) in do I need to call calcBearingWithLatitude in (void)startup? All I am trying to do is have the compass pull a point from memory and use that point as its "north" so to speak and point to it, no need for distance or anything like that. My implementation file as of now looks like @implementation TrackerViewController @synthesize locationManager; @synthesize compass;

问题 What property do i need to set in the C1Report Designer to display the heading of my sub report on each new page. Repeat = true With that property set, the sub report does not show the heading on each new page. It does work fine for the Main Report tho. 回答1: You need to add a Grouping on the primary key field for the sub-report. Then check the header and footer section. Then set the repeat = true for the header and footer section. 来源： https://stackoverflow.com/questions/5431497/how-to-show

问题 I have a dataframe that is 438x14401. I have a DateTimeIndex that is the same length (width?) as the columns in the dataframe, which are now just labeled 1 - ... I am trying to replace those values with the dates in my DateTimeIndex. I am trying to substitude column headings 0 - end with the datetimeindex values, which should match in length. I have tried just renaming the columns with the dates and merging them, with no success. Is this at all possible? stations = stations.iloc[:,2:].rename

问题 I am making a GPS-Like App and I need to know when the user turns left or right (his heading) to change the rotation of the position marker. I've tried this and this But none of them is working, the first one just randomly changes even if I haven't totally turned and the second one just works if you change the device from horizontal to vertical or viceversa. Can someone give me a hand please? Thanks. 来源： https://stackoverflow.com/questions/52626704/android-know-when-user-turns-to-left-or

问题 I have a data table of the form ID REGION INCOME_BAND RESIDENCY_YEARS 1 SW Under 5,000 10-15 2 Wales Over 70,000 1-5 3 Center 15,000-19,999 6-9 4 SE 15,000-19,999 15-19 5 North 15,000-19,999 10-15 6 North 15,000-19,999 6-9 created by exp = data.table( ID = c(1,2,3,4,5,6), REGION=c("SW", "Wales", "Center", "SE", "North", "North"), INCOME_BAND = c("Under ?5,000", "Over ?70,000", "?15,000-?19,999", "?15,000-?19,999", "?15,000-?19,999","?15,000-?19,999"), RESIDENCY_YEARS = c("10-15","1-5","6-9",

问题 X and Y axis of magnetometer can be used to calculate the heading of north when phone is level to the local ground. But when rolling or pitching the phone, we should use roll and pitch degree to eliminate the tilt error. Now, I want to know whether the gravity sensor is used as tilt sensor to get the roll and pitch to help improve the accuracy of heading to the north? 回答1: Here I describe how to get the orientation of the device with respect to the horizontal plane and the magnetic North. It