coordinate-systems

问题 My question is quite simple : in matplotlib, how can I easily convert coordinates in Axis system to/from Data system (Ideally I'm looking for a simple function output_coords = magic_func(input_coords) ) Actually my exact problem is : I'd like to plot an matplotlib.patches.Ellipse with his center in Axis system but his size (width & length) in Data system. But the transforms.blended_transform_factory method doesn't work in this case. Thanks ! 回答1: To get transformations from the Axes instance

问题 My question is quite simple : in matplotlib, how can I easily convert coordinates in Axis system to/from Data system (Ideally I'm looking for a simple function output_coords = magic_func(input_coords) ) Actually my exact problem is : I'd like to plot an matplotlib.patches.Ellipse with his center in Axis system but his size (width & length) in Data system. But the transforms.blended_transform_factory method doesn't work in this case. Thanks ! 回答1: To get transformations from the Axes instance

问题 LibGDX has a coordinate system where (0,0) is at the bottom-left. (like this image: http://i.stack.imgur.com/jVrJ0.png) This has me beating my head against a wall, mainly because I'm porting a game I had already made with the usual coordinate system (where 0,0 is in the Top Left Corner). My question: Is there any simple way of changing this coordinate system? 回答1: If you use a Camera (which you should) changing the coordinate system is pretty simple: camera= new OrthographicCamera(Gdx

问题 LibGDX has a coordinate system where (0,0) is at the bottom-left. (like this image: http://i.stack.imgur.com/jVrJ0.png) This has me beating my head against a wall, mainly because I'm porting a game I had already made with the usual coordinate system (where 0,0 is in the Top Left Corner). My question: Is there any simple way of changing this coordinate system? 回答1: If you use a Camera (which you should) changing the coordinate system is pretty simple: camera= new OrthographicCamera(Gdx

问题 I get some GPS coordinates from Google Maps and I need to find the distance between them using Objective C. I have implemented the formula but I get results that are way to big. I have tested the values from Google Maps by passing them back into Google Earth and a Geocoding service on the internet and everything checks out. Im now beginning to suspect that the cosine law demands I do some sort of conversion with the coordinates before I pass them in. I did a similar implementation of the

问题 I get two coordinate pairs in the form 90°0′0″N 0°0′0″E as string and want to calculate the distance between those points on a sphere with radius R=6371km. I found two formulas on the internet here, the "haversine" and the "spherical law of cosines", but they don't seem to work. For a 90° angle which should return 2*pi*R / 4 , the haversine operates correct but the cosines fail and return 0. A different point with more random coordinates returns false values with both algorithms: the

问题 Android provides sensor data in device coordinate system no matter how it is oriented. Is there any way to have sensor data in 'gravity' coordinate system? I mean no matter how the device is oriented I want accelerometer data and orientation in coordinate system where y-axis points toward the sky, x-axis toward the east and z-axis towards south pole. I took a look at remapCoordinateSystem but seems to be limited to only swapping axis. I guess for orientation I will have to do some low level

问题 I have file with latitude and longitude values, that i want to convert the x and y in km I want to measure the distance from each point. for instance I make the first points of latitude and longitude(which are 51.58, -124.6 respectfully) to (0,0) in my x and y system so than basically i want to find out what the other points are and their location from the origin so i want to find what 51.56(lat) -123.64(long) is in (x,y) in km and so on for the rest of the file. I want to do this all in

问题 I have file with latitude and longitude values, that i want to convert the x and y in km I want to measure the distance from each point. for instance I make the first points of latitude and longitude(which are 51.58, -124.6 respectfully) to (0,0) in my x and y system so than basically i want to find out what the other points are and their location from the origin so i want to find what 51.56(lat) -123.64(long) is in (x,y) in km and so on for the rest of the file. I want to do this all in

问题 (Revised Question based on comment:) OK I will try to ask in other way...How can I get border coordinates of this circle overlay: (Original Question:) I am having weird problem with my iPhone app. I have MKCoordinateRegion which has center coordinate latitude: 51.509980 and longitude: -0.133700. I have used method MKCoordinateRegionMakeWithDistance and set the distance to be 16,093.44 meters (10 miles). I want to get border point of this region therefore I have this code: MKCoordinateRegion