centerline | Calculate the polygon 's centerline | Map library
kandi X-RAY | centerline Summary
kandi X-RAY | centerline Summary
Calculate the polygon's centerline
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- Constructs the centerline of the mesh
- Returns a list of interpolated points
- Get interpolated boundary
- Return a list of polygons in the input geometry
- Calculates the vertices and ridge edges for Voronoi diagram
- Extract polygons from input geometry
- Check if a linestring is within the input geometry
- Returns the coordinates of the first point in linestring
- Returns the coordinates of the last point in the linestring
- Creates a point with the given coordinates
- Creates a point with the reduced coordinates
- Check if a polygon has interior rings
- Create centerlines from source files
- Get OGR driver for given filepath
- Find the version string
- Read file contents
centerline Key Features
centerline Examples and Code Snippets
Community Discussions
Trending Discussions on centerline
QUESTION
I have the following data that I need to pivot:
there is more data but this is a good representation. There are several samples. The results column is a derived field.
I have tried pivot (max(results) for question in [OFFSET DIRECTION],[OFFSET DISTANCE],[REFERENCE LINE],[STATION NUMBER],[THICKNESS]
I get pivoted data and the first set of rows (each with a new sample) with good data but starting with scmn (specimen number) is pulling data from other samples. I have tried various row_number() over (partition by sample, scmn order by sample, scmn) as [control] but nothing is working.
What I need is: [
I have spent many days on this and am hitting a wall. Any help will be greatly appreciated.
Here is sample code:
...ANSWER
Answered 2021-May-28 at 23:17You have used wrong column values for the PIVOT which resulted you in NULL for Reference. Make sure you copy and paste column names when you use them in PIVOTS. That was the issue here. Error was [REFENCE LINE] had a spelling mistake. Avoid this, copy and paste column values when using them in PIVOTS as PIVOTS dealing with rows values.
1st without block column names
QUESTION
I've encountered a problem working with Xamarin Forms for Android. I've created a TabbedPage with ContentPages for displaying different content. At the bottom, there is a navigational tab bar, which should have icons displayed. What is the way to center the tab bar icons or align the displayed content, so that the icon would be in the center? Currently, the text is below the horizontal centerline of the individual tab bar item while the icon is above it:
This project is for Android only
...ANSWER
Answered 2021-Apr-16 at 19:40There is no way to this from XAML code only.
To achieve this on Android you need to get access to the native BottomNavigationView and change LabelVisibilityMode to LabelVisibilityMode.LabelVisibilityUnlabeled
Here's how I did in one of my apps using a custom renderer for TabbedPage:
QUESTION
Using GDI+ in Delphi 10.2.3: I have an elliptical (not circular) arc drawn from a rectangular RectF and defined start and swept angles using DrawArcF. I need to be able to find any point along the centerline of the arc (regardless of pen width) based just on the degrees of the point - e.g., if the arc starts at 210 for 120 degrees, I need to find the point at, say, 284 degrees, relative to the RectF.
In this case, the aspect ratio of the rectangle remains constant regardless of its size, so the shape of the arc should remain consistent as well, if that makes a difference.
Any ideas on how to go about this?
...ANSWER
Answered 2021-Mar-05 at 03:48Parametric equation for axis-aligned ellipse centered at cx, cy with semiaxes a,b against angle Fi is:
QUESTION
I have this html-code generated from a xml-file which is generated from latex code and I can't change the html output. I work on an indological edition of an anient yoga text. I not just want to have a nice latex document for printing my edition. I want to also have a web edition simultanously. So my lualatex code is processed putting out an xml-file which a xslt2 processor processes to an html file. This is the html:
...ANSWER
Answered 2021-Jan-31 at 18:02Do you need such a result?
QUESTION
Is there an easy way to draw (or define by waypoints) a driving route that is snapped to road centerlines in Mapbox Studio dataset editor, like can be done in Google Maps (image)? I see how to draw points, lines and polygons, but no option for driving (or walking/cycling) routes.
If not, is there a suggested workaround? I see how to import Google KML into a tileset, but the imported route is not snapped to the Mapbox roadways.
Thanks
...ANSWER
Answered 2021-Jan-31 at 20:48One can get a navigable route using Mapbox's Directions API Playground. Save the response to a file, eg navigation_route.geojson, for use in the python code snippet below.
Then one can extract a polyline from the response using the snippet below which saves the extracted polyline to a similarly named file (eg navigation_route_parsed.geojson, below). This file can up uploaded to Mapbox Studio as a dataset and then imported to a map within Mapbox Studio as a layer to ultimately create a map with multiple navigable routes.
QUESTION
I have a QListWidget and a QGraphicsView both subclassed to overwrite some of their members. I prepared a minimal verifiable example showing the problem I have here
From the QListWidget I can drag and drop specific field (represented by a QTableWidget) and drop them into a QGraphicsView and in order to do that I am using a QGraphicsProxyWidget approach as shown below.
The Problem
Now, how do I connect 2 QRadioButton inside cell of a QTableWidget with another cell of another QTableWidget?
It is important to mention that the green QGraphicsRectItem it is used to move around the QTableWidget as well as adjusting its dimension.
Below the result I was able to arrive so far:
And below the expected result I have been trying to achieve:
Below the most important part of the code:
scene.h
...ANSWER
Answered 2020-Oct-21 at 16:23When a start and end radio buttons are checked, you need to create the arrow with those buttons as start and end nodes, e.g.:
QUESTION
I will preface this with the fact that I am a GIS guy with beginner to intermediate experience with Python using the ArcPy module.
I have a stream centerline file that is in 3D, meaning each vertex has an elevation value associated with it. I am trying to flag inflection points along the profile using ArcGIS Pro and/or Python 3, specifically where elevation changes by .5 feet or more. Here are some examples of the inflection points I am talking about:
I have a table with the vertices and elevation for each one. I added a field called 'Flag' to store which vertices are the inflection points.
Is there a way to flag the vertices where there is a rise of 0.5 or more using Python? I've heard of Pandas but not much experience with this.
...ANSWER
Answered 2020-Oct-06 at 19:17I'm not sure how your data is currently represented in your program. If you can convert it to a numpy array, diff() calculates the discrete difference between elements
Converting to numpy arrays if you have the values in a list is as easy as
QUESTION
I am trying to display the waveform of an audio file. I would like the waveform to be drawn progressively as ffmpeg processes the file, as opposed to all at once after it's done. While I have achieved this effect, it's REALLY slow; like painfully slow. Its starts out really fast, but the speed degrades to the point of taking minutes to draw a sample.
I feel there has to be a way to do this more efficiently, as there is a program I use that does it, I just don't know how. The other program can take in >10 hours of audio and progressively display the waveform with no speed degradation. I have set ffmpeg to process the file at 500 samples/sec, but the other program samples at 1000/sec and it still runs faster than what I wrote. The other program's waveform display only takes about 120MB of RAM with a 10 hour file, where mine takes 1.5GB with a 10 minute file.
I'm fairly certain the slowness is caused by all the UI updates and the RAM usage is from all the rectangle objects being created. When I disable drawing the waveform, the async stream completes pretty fast; less than 1 min for a 10 hour file.
This is the only way I could think to accomplish what I want. I would welcome any help to improve what I wrote or any suggestions for an all together different way to accomplish it.
As a side note, this isn't all I want to display. I will eventually want to add a background grid to help judge time, and draggable line annotations to mark specific places in the waveform.
MainWindow.xaml
...ANSWER
Answered 2020-Sep-28 at 15:17You could try drawing a Path by hand. I use this to draw histograms of images in an application:
QUESTION
I'm integrating a python function in R code using the reticulate package, the original output in python is MultiLineString.
Class of output in Rstudio is :
ANSWER
Answered 2020-Aug-20 at 16:03#output of python function in R
> class(result)
[1] "centerline.geometry.Centerline" "shapely.geometry.multilinestring.MultiLineString"
[3] "shapely.geometry.base.BaseMultipartGeometry" "shapely.geometry.base.BaseGeometry"
[5] "python.builtin.object"
> typeof(result)
[1] "environment"
#Convert from Python to R object
processed <- reticulate::py_to_r(result)
#change type from environment to character
result_2<-type.convert(processed,as.is = TRUE)
#read WKT and construct SpatialLines
x<-readWKT(result_2)
> x
class : SpatialLines
features : 1
extent : 187.6103, 191.6382, -25.8519, -24.55464 (xmin, xmax, ymin, ymax)
crs : NA
QUESTION
I have a Dataframe that corresponds to a 3D centerline (x,y,z). I want to turn the Dataframe into a binary array with shape (272, 512, 512). The z values from the Dataframe range from about 40-160 and they correspond to the first column in the array. The x and y values correspond to the second and third columns in the array, respectively. Any xyz value not in the Dataframe should correspond to a 0 in the array and any value that is present should correspond to a 1. Any ideas on how to do this considering each plane/slice may have multiple 1's in the array?
I was able to accomplish this if I limited the Dataframe to only have one row per unique z value (one point for each slice) but the real data has multiple rows per unique z value.
Here is what the header of the Dataframe looks like
This is the code that works for downsampled Dataframe (only one row per unique z value):
...ANSWER
Answered 2020-Mar-22 at 04:31I'd come at this a different way. How about iterating over the rows of the original dataframe. Then use the coordinate from each dataframe row to set the appropriate element in empty_array to 1.
Below's some example code. empty_array is renamed as binary_array. You may need to convert your coordinates from floats to integers to be able to use then as indices in binary_array.
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Install centerline
You can use centerline like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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