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, denismfmcma...@gmail.com -- https://mail.python.org/mailman/listinfo/python-list