I'm not sure that I understand exactly what you are trying to do, but
you may want to look into Matplotlib annotation. Here's a really quick
example:
import matplotlib.pyplot as plt
plt.annotate('', (1, 1), (0, 0),
arrowprops=dict(facecolor='black'))
plt.axis([-1, 2, -1, 2])
plt.show()
There are many options to make very fancy arrows, and there are several
places in the docs to read about this in more detail:
http://matplotlib.org/users/annotations_intro.html
http://matplotlib.org/users/annotations_guide.html
Hope that helps a little. Good luck.
Ryan
On 4/12/2013 5:55 AM, Bakhtiyor Zokhidov wrote:
Hi,
I have encountered some problem while I was drawing a direction of
arrow. I have point (x,y) coordinates and angle of them. What I want to
do is that to draw arrow according to the given angle (just to show the
point direction as an arrow in each point coordinate). Here, we should
assume coordinates of '+x', '+y', '-x ', '-y' are 90, 0, 270, 180
degrees, respectively.
I am a bit unfamiliar with Python drawing tools. I am still not sure to
draw directional point (arrow based on angle) whether I use pylab or
some other modules or.. still not sure at all. I put the following codes
as a sample to give better description:
import numpy as np
import scipy as sp
import pylab as pl
def draw_line(x,y,angle):
# Inputs:
x = np.array([ 2, 4, 8, 10, 12, 14, 16])
y = np.array([ 5, 10, 15, 20, 25, 30, 35])
angles = np.array([45,275,190,100,280,18,45])
# First, draw (x,y) coordinate
???
# Second, according to the angle indicate the direction as
an arrow
???
Thanks in advance for your friendly support,
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Precog is a next-generation analytics platform capable of advanced
analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
http://www2.precog.com/precogplatform/slashdotnewsletter
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