Dear network,
I am trying to create a custom node to draw plots using matplot lib. I need to give inputs as “lists” to my custom node, But an error occurs as follows,
Hi @utech.udara ,
I am not an expert with creating custom nodes but you should use something like this (i think).
String and Int
(Or, if the first one doenst work) Var or Var…
Ps: do you need to specify the input types at all?
1 Like
Hello,
you have to look at the script by M. C. Poupin
I tried but with I have trouble with python, if it can help you Can I use matplotlib in Dynamo? - #5 by c.poupin
I attach what I tried to do
# Charger les bibliothèques DesignScript et Standard Python
import sys
import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *
import os
clr.AddReference('System.Drawing')
import System.Drawing
from System.Drawing import *
from System.Drawing.Imaging import *
from System.IO import MemoryStream
localapp = os.getenv(r'LOCALAPPDATA')
sys.path.append(os.path.join(localapp, r'python-3.9.12-embed-amd64\Lib\site-packages'))
import numpy as np
import matplotlib.pyplot as plt
from PIL import Image
import io
import math
# Les entrées effectuées dans ce noeud sont stockées sous forme de liste dans les variables IN.
a=IN[0]
b=IN[1]
# Placer votre code au-dessous de cette ligne
def plt2arr(fig):
fig.canvas.draw()
rgba_buf = fig.canvas.buffer_rgba()
(w,h) = fig.canvas.get_width_height()
rgba_arr = np.frombuffer(rgba_buf, dtype=np.uint8).reshape((h,w,4))
return rgba_arr
def convertToBitmap2(npImgArray):
bitmap_ = None
# remove alpha
if npImgArray.ndim == 3 and npImgArray.shape[-1] == 4:
npImgArray = npImgArray[:, :, :-1]
# convert to PIL Image
if npImgArray.ndim == 3:
image = Image.fromarray(npImgArray, "RGB")
else:
image = Image.fromarray(npImgArray, "L")
# convert to Python ByteArray
byteIO = io.BytesIO()
image.save(byteIO, format='BMP')
byteArr = byteIO.getvalue()
# convert to Net ByteArray
netBytes = System.Array[System.Byte](byteArr)
with MemoryStream(netBytes) as ms:
bitmap_ = Bitmap(ms)
return bitmap_
xpoints = np.array(b[0])
ypoints = np.array(b[1])
plt.plot(xpoints,ypoints)
plt.xlabel(a[0])
plt.ylabel(a[1])
fig=plt.figure()
ax = fig.add_subplot(111)
ax.plot(xpoints,ypoints)
ax.set_xlabel(a[0])
ax.set_ylabel(a[1])
image_from_plot = plt2arr(fig)
bitmap1 = convertToBitmap2(image_from_plot)
# Affectez la sortie à la variable OUT.
OUT = bitmap1
Cordially
christian.stan
2 Likes
@christian.stan Thank you for the reply. Yes, I have followed it and used the python fuction defined. However, the issue occurs when I create a custom node. The idea is to reuse the node at different locations rather creating python node repeatedly.
1 Like
Hi!
But when I use var instead of List , then custom node take one item at a time. That’s the problem 
