coordinate-systems

问题 I have CVPixelBufferRef from an AVAsset . I'm trying to apply a CIFilter to it. I use these lines: CVPixelBufferRef pixelBuffer = ... CVPixelBufferRef newPixelBuffer = // empty pixel buffer to fill CIContex *context = // CIContext created from EAGLContext CGAffineTransform preferredTransform = // AVAsset track preferred transform CIImage *phase1 = [CIImage imageWithCVPixelBuffer:pixelBuffer]; CIImage *phase2 = [phase1 imageByApplyingTransform:preferredTransform]; CIImage *phase3 = [self

问题 I need a transform from geo coord system to/from another coord system. I'd think the obvious way to do this would be to give the two bounding boxes of the systems. So if I had a geo bbox, in lon/lat coords, and a non-geo bbox that corresponds to that but in my own coordinates, I'd like a xfm that could convert geo-to-me and me-to-geo. I need this for an agent based programming environment that has its own coord system based on minX, minY, maxX, maxY, just as Turf expresses bboxes. It would

问题 I recently posted a question about a texture issue I was having. And I think I've discovered the culprit of my problem, but I'm unsure how to handle this, or what I should be doing. Here is the link to the question I had asked: DirectX Texturing Inversion Issues After asking that question I got to work just sitting there toying with everything, and eventually ended up just randomly trying to switch from a left handed coordinate system, to a right handed one. Changing to a right handed

问题 I have a known point (centre) with known latitude and longitude and I have some coordinates (in lat/lon) in a df and I want to see which ones are within a radius of 5km or less from the centre point. Centre mylon <- c(-2.106472) mylat <- c(57.14455) Coordinates longitude latitude [1,] -2.141177 57.16278 [2,] -2.090960 57.18079 [3,] -2.118894 57.12292 [4,] -2.140090 57.13763 [5,] -2.113988 57.13855 [6,] -2.123892 57.13585 [7,] -2.144685 57.17207 [8,] -2.220046 57.19150 [9,] -2.114343 57.09301

问题 I have a known point (centre) with known latitude and longitude and I have some coordinates (in lat/lon) in a df and I want to see which ones are within a radius of 5km or less from the centre point. Centre mylon <- c(-2.106472) mylat <- c(57.14455) Coordinates longitude latitude [1,] -2.141177 57.16278 [2,] -2.090960 57.18079 [3,] -2.118894 57.12292 [4,] -2.140090 57.13763 [5,] -2.113988 57.13855 [6,] -2.123892 57.13585 [7,] -2.144685 57.17207 [8,] -2.220046 57.19150 [9,] -2.114343 57.09301

问题 I have a known point (centre) with known latitude and longitude and I have some coordinates (in lat/lon) in a df and I want to see which ones are within a radius of 5km or less from the centre point. Centre mylon <- c(-2.106472) mylat <- c(57.14455) Coordinates longitude latitude [1,] -2.141177 57.16278 [2,] -2.090960 57.18079 [3,] -2.118894 57.12292 [4,] -2.140090 57.13763 [5,] -2.113988 57.13855 [6,] -2.123892 57.13585 [7,] -2.144685 57.17207 [8,] -2.220046 57.19150 [9,] -2.114343 57.09301

问题 I'm almost positive this has been answered already; however, unable to find it since XY coordinates are overloaded due to their relative definition. What I am trying to find/figure out is how to take latitude/longitude coordinates (e.g. 12.121212, -12.323232) and convert such so they can be mapped onto a 2-dimensional plane such as a point on an image map. Has anyone solved this issue and know of a script or another SO question that they can point me to? Ideally I'm seeking a solution in

问题 I am quite confused with the spritekit coordinate system. I need clarification on two cases. Case 1: When a sprite node is added as child to the scene: SKSpriteNode * blueBall = [SKSpriteNode spriteNodeWithImageNamed:@"hRedBall.png"]; blueBall.name=@"blueball"; blueBall.size=CGSizeMake(75, 75); blueBall.position=point; //I am varying this point [self addChild:blueBall]; I have added the node at different points each time.These are the points I added the node at: (100x100)(200x200)(300x300)

问题 I have the following situation in my multi-monitor setup: In this example I want to position a window exactly at the coordinates depicted with the yellow arrow. All I do have however, are the coordinates of an NSView that is a subview of the contentView of an NSWindow that spans the entire (bigger,upper) secondary monitor. Here's how the global coordinate space is defined: {0,0} is the coordinate of the upper left corner of my laptop screen. (green) {-296, -1080} is the coordinate of the

问题 I have the following situation in my multi-monitor setup: In this example I want to position a window exactly at the coordinates depicted with the yellow arrow. All I do have however, are the coordinates of an NSView that is a subview of the contentView of an NSWindow that spans the entire (bigger,upper) secondary monitor. Here's how the global coordinate space is defined: {0,0} is the coordinate of the upper left corner of my laptop screen. (green) {-296, -1080} is the coordinate of the