topic Re: Custom polygon shapes for drawing ? in Data Management Questions

Custom polygon shapes for drawing ?

KiraDimeler — Thu, 11 Dec 2014 22:14:43 GMT

So I would like to create additional options for custom shapes when editing a polygon feature. Something to the same functionality of the 'Construction Tools' as pictured below, but with a greater variety of shapes (like a triangle, pentagon, irregular shape as below, etc).

Wondering what the best method would be to go about this? I'm assuming it's not possible to add custom shapes directly into the already existing Construction Tools panel (tho I'm not technically versed enough to know).. but in that case would writing an Add-In be the best way? Is it possible?

..I probably won't be doing this by myself unless it requires minimal coding experience, but I'd really appreciate if someone can point me to the correct basic approach!

Re: Custom polygon shapes for drawing ?

JamesFitzgerald — Fri, 12 Dec 2014 15:32:19 GMT

Hello Kira,

It is possible to create custom shapes. It does, however, require python code to perform it. I can pass some code along to you. It basically works, in a manner, where the user drops a point and then draws a polygon. I used it to create many polygons based on zoning. The polygons were basic shapes based on length and height. If you had several custom shapes, then code would have to account for the dimensions.Also, you would have to start an edit session to orient the shapefiles.

Let me know if you want the code

James

Re: Custom polygon shapes for drawing ?

KiraDimeler — Fri, 12 Dec 2014 18:30:53 GMT

Yes, I'd love to see that code!
That'd be brilliant. Thanks for the response~

Re: Custom polygon shapes for drawing ?

JorgeOrellana — Fri, 12 Dec 2014 18:35:08 GMT

I would love to see the code as well if that would be possible. This could same me quite a bit of time. Thanks!

Re: Custom polygon shapes for drawing ?

JamesFitzgerald — Sat, 11 Dec 2021 14:22:49 GMT

import arcpy, os
arcpy.env.workspace = "U:\Tax\Special Projects\JEFitzgerald\CUVA\2014\CUVA_PYTHON_06252014_Final\CUVA.mdb"
pointList=[]
#Finds the field named File and deletes it
try:
    with arcpy.da.UpdateCursor("GC_R20_Polygon",("File"),'[File] =\'Done\'') as cursor:
        cntr = 1
        for row in cursor:
            cursor.deleteRow()
            print "Record number "+ str(cntr) + " deleted"
            cntr = cntr + 1
except Exception as e:
    print e.message
    
            #****  CODE for R20    ****#
try:   
    with arcpy.da.SearchCursor ("GC_R20", ["SHAPE@XY"]) as cursor:
        for row in cursor:
            xy = row[0]
            pointList.append(xy)
      
         
    with arcpy.da.InsertCursor ("GC_R20_Polygon", ["SHAPE@"]) as U:
        for pnt in pointList:
            lowX = pnt[0]
            lowY = pnt[1]
        #   find the upper right
            highX = lowX + 162.2539
            highY = lowY + 123.2639
            array = arcpy.Array([arcpy.Point(lowX, lowY),
                             arcpy.Point(lowX, highY),
                             arcpy.Point(highX, highY),
                             arcpy.Point(highX, lowY),
                             arcpy.Point(lowX, lowY)])
            polygon = arcpy.Polygon(array)
            U.insertRow([polygon])
            
    #Populates a field with DONE so the delete cursor will find and delete.
    #This will enable a clean attribute table so dublicates will be eliminated.
    arcpy.CalculateField_management("GC_R20_Polygon","File", "\"Done\"", "PYTHON", "")
    print "Process for new polygons is complete"
    print "James E. Fitzgerald, GISP, GIS Specialist"
except:
    print

Re: Custom polygon shapes for drawing ?

JamesFitzgerald — Fri, 12 Dec 2014 20:40:36 GMT

Hello,

With this code you have to create your shapefiles. I am new to Python Scripting so there may be excess to delete. Thanks,

James

Re: Custom polygon shapes for drawing ?

KiraDimeler — Thu, 18 Dec 2014 17:35:46 GMT

James Fitzgerald, Thanks so much for posting this. I'm super new to Python, but I think I understand what the code is doing, but could you explain a little more how to implement it in ArcGIS? You mentioned to have an Edit session open.. Perhaps which parameters need to be changed or the defined 'workspace'? Not quite sure how that works. If I run this in Arc atm, in an open Edit session, I get "cannot open 'GC_R20_Polygon'".

Re: Custom polygon shapes for drawing ?

JamesFitzgerald — Sat, 11 Dec 2021 14:22:52 GMT

You have to create a point.shp (GC_R20). GC_R20.shp is what I used give me the starting point in terms of XY. Also, you have to have a polygon created too. I named it GC_R20_Polygon. I edited the original code to exclude unnecessary code.

import arcpy, os  
arcpy.env.workspace = "U:\Tax\Special Projects\JEFitzgerald\CUVA\2014\CUVA_PYTHON_06252014_Final\CUVA.mdb"  
pointList=[]  

    try:     
            with arcpy. ["SHAPE@XY"]) as cursor:  
        for row in cursor:  
            xy = row[0]  
            pointList.append(XY)
           
    with arcpy.0_Polygon", ["SHAPE@"]) as U:  
        for pnt in pointList:  
            lowX = pnt[0]  
            lowY = pnt[1]  
        #   find the upper right  
            highX = lowX + 162.2539  
            highY = lowY + 123.2639  
            array = arcpy.Array([arcpy.Point
                             arcpy.Point(lowX, highY),  
                             arcpy.Point(highX, highY),  
                             arcpy.Point(highX, lowY),  
                             arcpy.Point(lowX, lowY)])  
            polygon = arcpy.Polygon(array)  
            U.insertRow([polygon])  
              
    #Populates a field with DONE so the delete cursor will find and delete.  
    #This will enable a clean attribute table so dublicates will be eliminated.  
    arcpy.CalculateField_management("GC_R20_Polygon","File", "\"Done\"", "PYTHON", "")  
    print "Process for new polygons is complete"   
except:  
    print

Re: Custom polygon shapes for drawing ?

JorgeOrellana — Thu, 18 Dec 2014 19:02:01 GMT

I think you accidentally removed parts that are necessary for the code to work? i.e Line 6 and Line 11.

On a side note, this code will work for 10.1 and up. the Data Access module was introduced at 10.1. I am only on 10 and can't test it. But thanks anyways, I'll keep it in my back pocket.with

Re: Custom polygon shapes for drawing ?

KiraDimeler — Thu, 18 Dec 2014 19:27:05 GMT

That gave me some syntax errors, but I edited the code a little (below) and created my own shape named GC_R20, with a polygon also named GC_R20.. I run it through the Python window in Arc and receive no errors, but nothing seems to happen either. ‌Should this add a polygon to a template somewhere, or should it work if I start drawing in the Edit session?

(for some reason it's not letting me apply the code style atm..)

import arcpy, os
arcpy.env.workspace = "D:/TESTING"
pointList=[]

try:
    with arcpy.da.SearchCursor ("GC_R20", ["SHAPE@XY"]) as cursor:
        for row in cursor:
            xy = row[0]
            pointList.append(XY)

    with arcpy.da.InsertCursor ("GC_R20", ["SHAPE@"]) as U:
        for pnt in pointList:
            lowX = pnt[0]
            lowY = pnt[1]
        #   find the upper right
            highX = lowX + 162.2539
            highY = lowY + 123.2639
            array = arcpy.Array([arcpy.Point(lowX, lowY),
                             arcpy.Point(lowX, highY),
                             arcpy.Point(highX, highY),
                             arcpy.Point(highX, lowY),
                             arcpy.Point(lowX, lowY)])
            polygon = arcpy.Polygon(array)
            U.insertRow([polygon])

    #Populates a field with DONE so the delete cursor will find and delete.
    #This will enable a clean attribute table so dublicates will be eliminated.
    arcpy.CalculateField_management("GC_R20","File", "\"Done\"", "PYTHON", "")
    print "Process for new polygons is complete"
except:
    print

Re: Custom polygon shapes for drawing ?

JamesFitzgerald — Thu, 18 Dec 2014 19:33:52 GMT

Hey,

Change the U: to 😧 (See below)

I use PythonWIN to write my code and save it as a script. I open the script to edit. Not sure if this matters.

with arcpy.da.InsertCursor ("GC_R20", ["SHAPE@"]) as U:

Re: Custom polygon shapes for drawing ?

JamesFitzgerald — Thu, 18 Dec 2014 19:34:59 GMT

Also, You may be able to cut...

#Populates a field with DONE so the delete cursor will find and delete.

#This will enable a clean attribute table so dublicates will be eliminated.

arcpy.CalculateField_management("GC_R20","File", "\"Done\"", "PYTHON", "")

print "Process for new polygons is complete"

Re: Custom polygon shapes for drawing ?

KiraDimeler — Thu, 18 Dec 2014 19:43:16 GMT

Switched the U: to 😧 in the code, I guess I'm just not sure what results I should be encountering..!
Thanks for helping my supreme newbieness..

Do you see anything off in the process below or my attribute table?

Re: Custom polygon shapes for drawing ?

JamesFitzgerald — Thu, 18 Dec 2014 19:48:06 GMT

Hey,

So you created a point shapefile? Send me your code you have been working on.

James

Re: Custom polygon shapes for drawing ?

KiraDimeler — Thu, 18 Dec 2014 19:58:02 GMT

OH. No... I created a polygon in the shape of what I want to replicate (in the previous image, the green shape, still called "GC_R20"). Should I be using pure points in a formation?

import arcpy, os
arcpy.env.workspace = "D:/ARCGIS_TESTING"
pointList=[]

try:
    with arcpy.da.SearchCursor ("GC_R20", ["SHAPE@XY"]) as cursor:
        for row in cursor:
            xy = row[0]
            pointList.append(XY)

    with arcpy.da.InsertCursor ("GC_R20", ["SHAPE@"]) as 😧
        for pnt in pointList:
            lowX = pnt[0]
            lowY = pnt[1]
        #   find the upper right
            highX = lowX + 162.2539
            highY = lowY + 123.2639
            array = arcpy.Array([arcpy.Point(lowX, lowY),
                             arcpy.Point(lowX, highY),
                             arcpy.Point(highX, highY),
                             arcpy.Point(highX, lowY),
                             arcpy.Point(lowX, lowY)])
            polygon = arcpy.Polygon(array)
            D.insertRow([polygon])


except:
    print

Re: Custom polygon shapes for drawing ?

JamesFitzgerald — Thu, 18 Dec 2014 20:08:08 GMT

Hey,

You will create one point.shp or many. The polygon is drawn based on the location of the point.shp XY.

James

Re: Custom polygon shapes for drawing ?

KiraDimeler — Thu, 18 Dec 2014 22:46:05 GMT

Ok! It's making more sense now... thank you!
So say I want to create a pentagon.. can you reference one point file called "PENTAGON" that has five points in it? Or do I need five separate shapes, with one point in each?

I notice in the code there is:

highX = lowX + 162.2539
highY = lowY + 123.2639

I'm not sure what it's referring to- is this something I would have to edit for each point? And what units?

Re: Custom polygon shapes for drawing ?

JamesFitzgerald — Fri, 19 Dec 2014 15:07:45 GMT

Hello,

The code is based on a single point then draws the polygon based on the point's X and Y positions. So if you have over one point it will draw more than one polygon. For my project I needed to create a bunch of squares based on a certain square feet area. You can enhance the code to draw as you want.

To draw a building's foot print you are going to have to alter the dimensions of below:

highX = lowX + 162.2539
highY = lowY + 123.2639

I believe the math can be done. Look at trigonometry. I will look and see if I can find any supporting documentation.

Thanks