Generate jpg files using line length (pixels) and orientation (degrees)

[Joel Goldstick]

On Fri, Jan 9, 2015 at 12:49 PM, <semeon.risom at gmail.com> wrote:

> On Thursday, 8 January 2015 20:54:38 UTC-6, Denis McMahon  wrote:
> > On Thu, 08 Jan 2015 22:07:03 +0000, Denis McMahon wrote:
> >
> > > On Thu, 08 Jan 2015 09:09:18 -0800, semeon.risom wrote:
> > >
> > >> Simple question. I hope. .....
> >
> > To follow up, below is a solution to the problem you stated.
> >
> > #!/usr/bin/python
> >
> > import Image, ImageDraw, math
> >
> > def makeimg(length, orientation):
> >     """
> >     Make an image file of a black 4 pixel wide line of defined length
> >     crossing and centered on a white background of 800 px square, save
> >     as a png file identifying line length and orientation in the file
> >     name.
> >     param length - pixels, length of the line
> >     param orientation - degrees, orientation ccw of the line from +ve x
> >     axis
> >     Files are saved in imgs subdir, this must already exist.
> >     File name is image_lll_ooo.jpg
> >     lll = length, ooo = orientation, both 0 padded to 3 digits
> >     """
> >
> >     # check length is +ve and not greater than 800
> >     if length < 0:
> >         length = length * -1
> >     if length > 800:
> >         length = 800
> >
> >     # check orientation is positive in range 0 .. 179
> >     while orientation < 0:
> >         orientation = orientation + 360
> >     if orientation > 179:
> >         orientation = orientation % 180
> >
> >     # calculate radius in pixels and orientation in radians
> >     radius = length / 2
> >     orient = math.radians(orientation)
> >
> >     # calculate xy coords in image space of line end points
> >     x1 = int(400 + (radius * math.cos(orient)))
> >     y1 = int(400 - (radius * math.sin(orient)))
> >     x2 = int(400 + (-radius * math.cos(orient)))
> >     y2 = int(400 - (-radius * math.sin(orient)))
> >
> >     # create an image
> >     img = Image.new('RGB', (800,800), 'rgb(255, 255, 255)')
> >     # create a draw interface
> >     draw = ImageDraw.Draw(img)
> >
> >     # draw the line on the image
> >     draw.line([(x1, y1), (x2, y2)], fill='rgb(0, 0, 0)', width=4)
> >
> >     # determine file name, save image file
> >     fn = 'imgs/image_{:03d}_{:03d}.jpg'.format(length,orientation)
> >     img.save(fn)
> >
> > # stepping through ranges of values
> > for length in range(100, 601, 100):
> >     for orientation in range(0, 171, 10):
> >         makeimg(length, orientation)
> >
> > # using lists of values
> > for length in [50, 150, 250, 350, 450, 550, 650]:
> >     for orientation in [0, 15, 40, 45, 60, 75, 90, 105, 120, 135, 150,
> > 165]:
> >         makeimg(length, orientation)
> >
> >
> >
> >
> > --
> > Denis McMahon, denismfmcmahon at gmail.com
>
> Thank you for the help btw. I think I'm close to a solution, but I'm
> having issue feeding the coordinates from my csv file into the formula.
>
> This is the error I get:
> Traceback (most recent call last):
>   File "C:\Users\Owner\Desktop\Stimuli Generation\Coordinates\Generate_w
> corr.py", line 68, in <module>
>     makeimg(length, orientation)
>   File "C:\Users\Owner\Desktop\Stimuli Generation\Coordinates\Generate_w
> corr.py", line 40, in makeimg
>     orientation = orientation % 180
> TypeError: unsupported operand type(s) for %: 'list' and 'int'
> >>>
>
> and here's the code:
>
> from PIL import Image, ImageDraw
> from numpy import math
>
> # import csv
> import csv
> f = open('C:\Users\Owner\DesktopStimuli Generation\Coordinates\file.csv',
> 'rb')
> rdr = csv.reader(f)
> f.seek(0)
> i = 0
> a = []
> b = []
> for row in rdr:
>         a.append(row[0])
>         b.append(row[1])
>
> def makeimg(length, orientation):
>     """
>     Make an image file of a black 4 pixel wide line of defined length
>     crossing and centered on a white background of 800 px square, save
>     as a png file identifying line length and orientation in the file
>     name.
>     param length - pixels, length of the line
>     param orientation - degrees, orientation ccw of the line from +ve x
>     axis
>     Files are saved in imgs subdir, this must already exist.
>     File name is image_lll_ooo.jpg
>     lll = length, ooo = orientation, both 0 padded to 3 digits
>     """
>
>     # check length is +ve and not greater than 800
>     if length < 0:
>         length = length * -1
>     if length > 800:
>         length = 800
>
>     # check orientation is positive in range 0 .. 179
>     while orientation < 0:
>         orientation = orientation + 360
>     if orientation > 179:
>         orientation = orientation % 180
>
>     # calculate radius in pixels and orientation in radians
>     radius = length / 2
>     orient = math.radians(orientation)
>
>     # calculate xy coords in image space of line end points
>     x1 = int(400 + (radius * math.cos(orient)))
>     y1 = int(400 - (radius * math.sin(orient)))
>     x2 = int(400 + (-radius * math.cos(orient)))
>     y2 = int(400 - (-radius * math.sin(orient)))
>
>     # create an image
>     img = Image.new('RGB', (800,800), 'rgb(255, 255, 255)')
>     # create a draw interface
>     draw = ImageDraw.Draw(img)
>
>     # draw the line on the image
>     draw.line([(x1, y1), (x2, y2)], fill='rgb(0, 0, 0)', width=4)
>
>     # determine file name, save image file
>     fn = 'imgs/image_{:03d}_{:03d}.jpg'.format(length,orientation)
>     img.save(fn)
>
>
> # using lists of values
> for length in [a]:
>     for orientation in [b]:
>         makeimg(length, orientation)
>

above should be:
   for length in a:
      for orientation in b:


--
> https://mail.python.org/mailman/listinfo/python-list
>



-- 
Joel Goldstick
http://joelgoldstick.com
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