point

Rotate a point around a point with OpenCV

由 旧街凉风 提交于 2019-11-27 13:02:25
问题 Does anyone know how I can rotate a point around another in OpenCV? I am looking for a function like this: Point2f rotatePoint(Point2f p1, Point2f center, float angle) { /* MAGIC */ } 回答1: These are the steps needed to rotate a point around another point by an angle alpha: Translate the point by the negative of the pivot point Rotate the point using the standard equation for 2-d (or 3-d) rotation Translate back The standard equation for rotation is: x' = x cos(alpha) - y sin(alpha) y' = x sin

mongodb check if point is in polygon

由 我是研究僧i 提交于 2019-11-27 12:57:17
问题 mongo 2.6 I have some amount of stored polygons. And I have a point. I what to know if this point fits any of stored polygons document example { ..., "polygons" : [ [ 17.60083012593064, 78.18557739257812 ], [ 17.16834652544664, 78.19381713867188 ], [ 17.17490690610013, 78.739013671875 ], [ 17.613919673106714, 78.73489379882812 ] ], ... } There is nearly the same question already Mongodb : Check if a point is inside a stored polygon. But it is not working for me - this query has to give at

Distance of point feature to nearest polygon in R

由 只谈情不闲聊 提交于 2019-11-27 12:34:24
问题 I working on a project at the moment, where I have a point feature -- the point feature includes a 142 points -- and multiple polygon (around 10). I want to calculate the distance between every single point and the nearest polygon feature in R. My current approach is tedious and a bit long winded. I am currently planning to calculate the distance between every single point and every single polygon. For example, I would calculate the distance between the 142 points and Polygon A, the distance

Point in Polygon algorithm giving wrong results sometimes [closed]

由 笑着哭i 提交于 2019-11-27 11:44:05
I saw on StackOverflow a "point in polygon" raytracing algorithm that I implemented in my PHP Code. Most of the time, it works well, but in some complicated cases, with complex polygons and vicious points, it fails and it says that point in not in polygon when it is. For example: You will find here my Polygon and Point classes: pointInPolygon method is in Polygon class. At the end of the file, there are two points that are supposed to lie inside the given polygon (True on Google Earth). The second one works well, but the first one is buggy :( . You can easily check the polygon on Google Earth

Finding translation and scale on two sets of points to get least square error in their distance?

由 ぐ巨炮叔叔 提交于 2019-11-27 10:11:06
问题 I have two sets of 3D points (original and reconstructed) and correspondence information about pairs - which point from one set represents the second one. I need to find 3D translation and scaling factor which transforms reconstruct set so the sum of square distances would be least (rotation would be nice too, but points are rotated similarly, so this is not main priority and might be omitted in sake of simplicity and speed). And so my question is - is this solved and available somewhere on

Unable to display only the points within a specific range (circle) using the .getBounds() function (Leaflet)

由 久未见 提交于 2019-11-27 08:34:19
问题 I am trying to display a certain amount of points within a specific range, that is within a circle . But when using the .getBounds() function for comparison to see whether the point is within the bound, i get some points outside it as shown in the screenshot below: Map Screenshot The code currently using to check if the point is within the circle bound is below: echo ' var mark = L.marker([' . $r->coordinates[0]->longitude . ',' . $r->coordinates[0]->latitude . ']); if(circle.getBounds()

Why is Lua arithmetic is not equal to itself? [duplicate]

由 亡梦爱人 提交于 2019-11-27 08:02:23
问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: What is a simple example of floating point/rounding error? When I execute the following Lua code: a = 5.6 b = 14 * 0.4 c = 11.2 / 2 d = 28 * 0.2 print( a == b ) print( a == c ) print( a == d ) print( b == c ) print( b == d ) print( c == d ) I get the following results: false true false false true false Can someone explain why 14 * 0.4 and 28 * 0.2 are not equal to 5.6? Thanks 回答1: You are dealing with the

See if lat / long falls within a polygon using mysql

由 吃可爱长大的小学妹 提交于 2019-11-27 07:01:18
I have the created the table below CREATE TABLE geom (g GEOMETRY); and have inserted many rows, example below: INSERT INTO geom (g) VALUES(PolygonFromText('POLYGON(( 9.190586853 45.464518970, 9.190602686 45.463993916, 9.191572471 45.464001929, 9.191613325 45.463884676, 9.192136130 45.463880767, 9.192111509 45.464095594, 9.192427961 45.464117804, 9.192417811 45.464112862, 9.192509035 45.464225851, 9.192493139 45.464371079, 9.192448471 45.464439002, 9.192387444 45.464477861, 9.192051402 45.464483037, 9.192012814 45.464643592, 9.191640825 45.464647090, 9.191622331 45.464506215, 9.190586853 45

Display the plot values on mouse over. - Detect Scatter points

由 本秂侑毒 提交于 2019-11-27 05:59:32
问题 I am attempting to display the plot values of different points on my QCustomPlot in which I have a Line style of lsLine . I know i could set a mouse over signal on the QCustomPlot but that wont really help since I just need to be informed when the mouse is over my plotted line.My question is is there any way to find out if the mouse is over my scatter point. Is there a signal i could connect to that would tell me when the mouse is over a scatter point ? 回答1: Reimplement QCustomPlot:

Position on Screen Right Bottom

由 ☆樱花仙子☆ 提交于 2019-11-27 04:46:24
问题 I need to position JFrame on my screen. But I can't make them appear on the right side of the screen bottom. Please can someone explain me how to position them, if you can describe how to do it, it would be great. Here is the code so far. //Gets the screen size and positions the frame left bottom of the screen GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); GraphicsDevice defaultScreen = ge.getDefaultScreenDevice(); Rectangle rect = defaultScreen
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