coordinates

Assuming I'm using some graphic API which allows me to draw bezier curves by specifying the 4 necessary points: start, end, two control points . Can I reuse this function to draw x percent of the 'original' curve (by adjusting the control points and the end point)? Or is it impossible? Unnecessary information, should someone care: I need the whole thing to draw every n % of the original bezier curve with different color and/or line style I'm using Java's Path2D to draw bezier curves: Path2D p = new GeneralPath(); p.moveTo(x1, y1); p.curveTo(bx1, by1, bx2, by2, x2, y2); g2.draw(p); What you

If i have a jpeg map with size sizeX, sizeY and some calibration points on the map (X, Y, Lon, Lat) What would be the algorithm for calculating the corresponding XY point in the map with a given Longitude / Latitude pair? Here's what worked for me, without so much bs. int x = (int) ((MAP_WIDTH/360.0) * (180 + lon)); int y = (int) ((MAP_HEIGHT/180.0) * (90 - lat)); The lat,lon coordinates were given to me by Android devices. So they should be in the same standard used by all Google Earth/Map products. If using the Equidistant Cylindrical Projection type map , here is what you need to do: Find

This question already has an answer here: Fastest Way to Find Distance Between Two Lat/Long Points 16 answers I have $latitude = 29.6815400 and $longitude = 64.3647100 , now in MySQL I would like to take the 15 nearest places to these coordinates and I'm planning to do this query: SELECT * FROM places WHERE latitude BETWEEN($latitude - 1, $latitude + 1) AND longitude BETWEEN($longitude - 1, $logintude + 1) LIMIT 15; Do you think it's correct or do you suggest something else? How to do the BEETWEEN , since I want to search trough a maximum of 50Km range the near places? I forgot to say that I

I have the Lat/Long value of New York City, NY; 40.7560540,-73.9869510 and a flat image of the earth, 1000px × 446px. I would like to be able to convert, using Javascript, the Lat/Long to an X,Y coordinate where the point would reflect the location. So the X,Y coordinate form the Top-Left corner of the image would be; 289, 111 Things to note: don't worry about issues of what projection to use, make your own assumption or go with what you know might work X,Y can be form any corner of the image Bonus points for the same solution in PHP (but I really need the JS) A basic conversion function in js

I've got the following information: There exists a sphere with origin (0,0,0) and radius R. After doing a ray-sphere intersection I know a point (XYZ) in 3D space that is on the sphere (the exact position in 3D space where the line pierces the sphere hull). For my program I'd like to calculate the Latitude and Longitude of the XYZ point on the sphere, but I can't think (or Google) up a way to do this easily. So in short, the function that I'm trying to write is this: public static LatLon FromVector3(Vector3 position, float sphereRadius) { return Latitude and Longitude } Does anybody know how