A point is a fundamental geometry entity.
Points are the basis for any other geometry entities, like lines, boxes, polygons, etc.
Find more information on points here.
Questions tagged [point]
2011 questions
8
votes
3 answers
opencv finding image cordinates on another image
How to find image "A" coordinates on image "B" which contains image "A".
I wrote this program which is only checking pixel values, does anyone know is there any library tool do this.
haykart
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8
votes
5 answers
Android, How can I rotate an arrow (image) around a fixed point?
I have an arrow image that I want to rotate from 0 to 180 degree (like the needle in a meter.) One point of the arrow is fixed in middle and at bottom of the screen and head of arrow should move. Length of arrow is fix (it is image). Also I have two…
Hesam
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8
votes
2 answers
How to offset polygon edges?
I have a list of point2D that makes a closed polygon. Now I want to create another set of 2D points by offsetting the polygon given an option inside or outside and an offset value. How can I do it?
N.T.C
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8
votes
3 answers
converting double values for making a Point type
I want to draw a curve (a diode curve) in a picturebox using imagefrom bitmap. I have a problem now and it is my point data are saved as Double and it is really important to keep the precesion.
for example a point in the plot I have is like…
Dumbo
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8
votes
1 answer
Order by distance on POINT in Laravel 5.1 via associated tables
I'm attempting to order events by their distance from a user submitted postcode and distance.
I've attached a sample of my database tables and their relationships, as you can see geom is associated with multiple addresses via postcode and addresses…
HelloSpeakman
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8
votes
2 answers
How to style points in openlayers 4
I'm trying to style points in a vector source in OpenLayers 4.
I've defined a style:
var pStyle = new ol.style.Style({
stroke: new ol.style.Stroke({
width: 6, color: [255, 0, 0, 1]
})
});
and added the style in the…
und
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8
votes
2 answers
Draw line between two given points (OpenCV, Python)
I am struggling with this problem for an hour by now...
I have an image with a rectangle inside:
This is the code I wrote to find the points for the corners:
import cv2
import numpy as np
img = cv2.imread('rect.png')
gray = cv2.cvtColor(img,…
BlueTrack
- 442
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8
votes
1 answer
Point in Polygon using Winding Number
The question is: how do you determine if a point is within a polygon?
This question has been asked and answered many times. There are multiple methods for determining whether a point is within a polygon.
I've grokked the Winding Number algorithm,…
Jim Speaker
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8
votes
3 answers
Javascript: rect.contains(point)
I like to see if mouseclick is in a rectangle area (in canvas).
In C# i would do this.
var point = new Point(x, y);
var rectangles = new List();
//rectangles.add(new Rect(x,y,h,w));
foreach(var rectangle in rectangles)
{
…
user3432681
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8
votes
1 answer
Finding an inner circle/ellipse of a 2D point cloud
I have a bunch of 2D-points. You can see them on the left picture. They form some sort of ring with a few bunny ears. My goal is to find the big inner cycle/ellipse, which you can see on the right side.
What kind of algorithms are useful for such…
Jakube
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8
votes
4 answers
Calculate middle point of Bezier Curve
I have a function to draw Bezier Curve through three points. I have already 2 points (start and end) - A and B. How do I calculate middle point between those two points as middle point would be always a little higher or lower than linear function of…
morad1n
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8
votes
2 answers
Geodjango: PointField and GEOSGeometry
If I can do this:
>>> from django.contrib.gis.geos import GEOSGeometry
>>> from django.contrib.gis.geos import Point
>>> point = GEOSGeometry('POINT(1 5)')
>>> print point
POINT (1.0000000000000000 5.0000000000000000)
Why can I not do this:
>>> lat…
Nick B
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8
votes
10 answers
Algorithm for spread-out 2D point distribution
In a 2D pixel array, I need an efficient algorithm that will select p% of pixels that are the most spread out.
This can be done adaptively by selecting points, then repeatedly adjusting the positions of points that are too close together. But this…
user20493
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7
votes
1 answer
Why does java.awt.Point provide methods to set and get doubles but store x and y as int's?
As you can see in the Oracle Documentation for java.awt.Point, x and y are stored as int. However, getX and getY return double. While there is a setLocation method that takes 2 double types, there is no constructor that does. Furthermore, the…
Luke
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7
votes
3 answers
Whether multiple points make up for a circle?
If I have e.g. 20 points, how can i check to see if those points make up for a circle? It doesnt have to be a perfect circle.
For example if I store the coordinates of my mouse every 200ms (as the user moves the mouse), I want to see if the user…
Afra
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