polylines | Easily handle Google polylines | REST library
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Easily handle Google polylines
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Trending Discussions on polylines
QUESTION
I don't know how to extract the irregular area surrounded by green lines. i.e., the left cheek and the right cheek of a face.
...ANSWER
Answered 2022-Mar-29 at 10:31You can accomplish this by two simple steps:
- Create a mask using the point coordinates you have
- Execute bitwise_and operation (crop)
Code:
QUESTION
I would like to convert the drawings inside a .dxf file into g-code. There are tools doing that but I would like to code it myself. So, the very first part is to decode the .dxf format. Yet, the contents of the .dxf file does not look easy to decipher.
I downloaded a .dxf file here and opened it in a text editor.
I am also referring to this manual. It looks like what is inside a .dxf file is mostly style and configuration information and I tend to omit almost everything. So, 1. can you specify attributes that should not be omitted, if there are any?
As far as I know the figures are divided into multiple ENTITIES in a .dxf file. Therefore, I am only copy pasting the SECTION of ENTITIES. Note that there are 6 SECTIONS in the file and the last section (BLOCKS OBJECTS) is the longest one although I don't know what that part represents (Would be nice if you could explain).
In the code below, 10 and 20 should be representing X and Y positions and 42 should be representing the bulge. It is kind of possible to track the polyline. I consider extracting information from the file by using the TITLES as navigation points as well as the numbers like 10, 20 and 42. But there are two polylines below. So, 2. which polyline should I take into consideration and what is the purpose of the other?
...ANSWER
Answered 2022-Mar-22 at 20:03The last section (
BLOCKS) is the longest one although I don't know what that part represents (Would be nice if you could explain).
The purpose of the BLOCKS section is summaried in the manual you referred to:
The
BLOCKSsection contains an entry for each block reference in the drawing.
Think of a block as a group of entities that are grouped together as one element. The block has:
- Origin
- Rotation
- Scale
Such blocks are referenced in the drawing itself and each instance of the block is called an INSERT.
So when you walk your ENTITIES section and you hit an INSERT entity, you then have to find its handle in the BLOCK table and process the elements accordingly.
There are some DXF codes that are common to many entities and they are not always listed with the information for a specific entity type (like LWPOLYLINE).
Look at this complete list for those numbers:
5: Entity handle; text string of up to 16 hexadecimal digits (fixed)
330: Soft-pointer handle; arbitrary soft pointers to other objects within same DXF file or drawing. Translated during
INSERTandXREFoperations100: Subclass data marker (with derived class name as a string). Required for all objects and entity classes that are derived from another concrete class. The subclass data marker segregates data defined by different classes in the inheritance chain for the same object. This is in addition to the requirement for DXF names for each distinct concrete class derived from ObjectARX (see Subclass Markers)
This page is also useful.
Why are there 2
LWPOLYLINESin the first place and why is it not only oneBLOCK-ENDBLKpair?
If you read through the section about BLOCKS you'll see:
Model Space and Paper Space Block DefinitionsThree empty definitions always appear in the
BLOCKSsection. They are titled*Model_Space,*Paper_Spaceand*Paper_Space0. These definitions manifest the representations of model space and paper space as block definitions internally. The internal name of the first paper space layout is *Paper_Space, the second is *Paper_Space0, the third is *Paper_Space1, and so on.
QUESTION
First of all, I will make a brief example for you to understand the idea.
...ANSWER
Answered 2022-Mar-21 at 23:54Your shiny example as three inputs:
Slider, which gets passed tokin the function signatureFilter1, which appears to be the same ask(i.e. choosing a cluster), and currently gets passed toFilter1in the function signatureFilter2, which is for selecting the Property, but never gets passed to the function.
I think what you want to do is include only Slider and Filter2 (or Filter1 and Filter2).
Then change the Modelcl to
QUESTION
polylines: {
if (_info != null)
Polyline(
polylineId: PolylineId('overview_polyline'),
width: 5,
points: _info.polylinePoints
.map((e) => LatLng(e.latitude, e.longitude))
.toList(),
),
},
ANSWER
Answered 2022-Mar-01 at 12:07Even though you check for the _info not being null, the type is not automatically promoted later since it's not a local variable (I cannot confirm this by looking at this piece of code, but that's quite a common problem). Thus, the compiler still considers for the variable to possibly hold a nullable value.
Since you are aware that the null check is there and _info won't be null, you could easily use the ! operator:
QUESTION
I have a shapefile with polylines of routes in different years. Here is an example data shapefile with routes in the year 2000 and year 2013. I would like the map to show the older routes at the top and more recent routes at the bottom. I've had a look at the addMapPane function but not sure how to apply it for a vector in the same file. Here is my code so far:
ANSWER
Answered 2022-Jan-09 at 15:28Please find one possible solution to get the older routes on top of recent routes: just need to change the order of rows in data_sample
- Code
QUESTION
I am using CPython and I saw in one example file with a star symbol.
Could you give an explanation what in this context the * symbol means?
Here the pointsets is a numpy array that comes from pybind11, because it is an output of C++ code.
Does the Point(*point) has something to do with the pointers in C++?
ANSWER
Answered 2022-Jan-07 at 12:33It's called unpacking operator. Here is what's written in the docs:
An asterisk
*denotes iterable unpacking. Its operand must be an iterable. The iterable is expanded into a sequence of items, which are included in the new tuple, list, or set, at the site of the unpacking.
It is much like the "..." operator from Javascript ES6. (the spread operator)
https://docs.python.org/3/reference/expressions.html#expression-lists
QUESTION
I'm making an app that control a drone, and I need to show its flight track and another track showing where the drone's LED were on.
The drone's track is easy. The problem is with the LED's track. Since the track width is important, I'm overlaping multiple circles (one for each location - 10 locations per second), since they have the radius property that is specified in meters.
The problem with the current approach is that the drone can make paths of 6km, but in the first 600m the app starts becoming really slow.
The problem using polylines, is that they have their width in pixels, not in meters.
How could I achieve my goal without consuming a lot of memory?
Some considerations are: the track width is important, and the drone will make a straight path most of the time, but it can make curves near waypoints.
I'm using flutter with google's official package for google maps, but any help considering native android code are welcome. This may help somehow.
...ANSWER
Answered 2021-Nov-24 at 00:43I don't have the details on how this works, but works:
QUESTION
I'm trying to create a leaflet map which shows different movement paths for different months of the year. I.e. I've got a dataset showing multiple journeys per month and I want to display the movement paths separately for each month using the addTimeslider feature of the leaflet.extras2 package.
To do so I have been trying to adapt the code posted by SymbolixAU I found here: leaflet add multiple polylines
This code uses sf functions including st_linestring to create an object that can be supplied to a addPolylines leaflet function to show all movement paths at once.
I'm pretty sure for my purposes (showing data separately for each month) I have to use st_multilinestring, which takes a list of matrices containing the coordinates for multiple polylines per row (with one row per month) rather than a single polyline per row.
Once I have that I think I could supply that object to the addTimeslider function of leaflet.extras2 to achieve what I need. I'm quite sure of this because when I used the sf object created using sf_linestring inthe AddTimeslider feature I was able to use the time slider on the map to individual movement paths at a time.
However, I have been trying for hours and haven't been successful. Would be hugely grateful for any pointers, please and thank you.
Some example data:
...ANSWER
Answered 2021-Nov-16 at 21:31I would do it slightly differently today, making use of {sfheaders} to build the linestrings.
QUESTION
I have multiple rectangle bounding boxes that I know are part of the same object (parts of a newspaper article), as in the first image. I'm trying to work out a way to merge these into one polygon bounding box, for the whole article, as in the second image.
I have seen lots of solutions based on merging overlapping bounding boxes, but I don't care if they're overlapping or not - I already know they're part of the same article. In some cases the headline is quite far away (for example above a picture), so solutions based on padding don't work either.
I feel like there should be a cv2 function that does this, but if there is, I am missing it. Any suggestions would be super helpful.
Code to create these two images:
...ANSWER
Answered 2021-Nov-14 at 18:00You could draw the convex hull of the contour points (this was drawn by hand):
(wrong convex hull image)
Then keep only the outer contour and try the polygonal approximation. I must admit that I cannot think of a smarter way of getting only vertical and horizontal lines.
As Christoph Rackwitz observed, I was wrong. Convex hull, doesn't work. Maybe an α-shape could solve the problem, but I'm not sure. An alternative approach could be to extract all the equations of the lines which define the bounding boxes, then for each point, compute the segment that connects it to the nearest line. If the line is part of the same bounding box or if the point falls outside of the bounding box, remove the segment.
It was harder than I expected, because my Python OpenCV proficiency is not enough. Nevertheless you can get nearly what you wanted in the question:
QUESTION
I'm looking for an algorithm that generates lines (or polylines if needed) that connect polygons.
Input: contains N polygons with coordinates for their vertices. The polygons are not intersecting, but may be inside each other.
Output: Vertices for N-1 lines (or polylines if necessary) connecting
Rules:
- The connecting lines cannot intersect each other
- The connecting lines cannot intersect the polygons
- The connecting lines can touch lines/vertices of the polygons
Example picture:
Any suggestions?
...ANSWER
Answered 2021-Nov-03 at 00:52Borrowing a trick from Kruskal's playbook, while there is more one polygon,
Find the closest pair of polygons (in general, a polygon can actually be a set of polygons with connecting bridges);
Connect them at their closest points with a straight line segment.
By taking the closest connection we can guarantee that its interior doesn't touch anything it shouldn't (otherwise the crossing would yield a shorter connection).
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