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POPython turtle.setup() truncates canvas to screen size - how to avoid that?
 

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  1. POPython turtle.setup() truncates canvas to screen size - how to avoid that?
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    <p>To measure the rotation speed of a rod, I need to make a dial with a large number of alternating dark / transparent segments arranged in a circle. The rotating dial will interrupt the light on a photosensor, and then I only need to measure the frequency of light pulses. Python turtle graphics seems like a good idea for drawing this dial.</p> <p>I need to draw this image very large, so as to avoid the stair-step effect on the edges of the segments - I need smooth edges. But if I do turtle.setup(x, y) with either x or y bigger than the screen, the canvas is truncated to fit the screen. How to avoid that?</p> <p>My code is included at the end. See here a screenshot with the truncated canvas for x = y = 1420</p> <p><img src="https://i.stack.imgur.com/Z1CuM.png" alt="truncated canvas screenshot"></p> <p><strong>EDIT:</strong> Just to make it clear - getscreen() / getcanvas() at the end capture this truncated canvas image and save it as-is (truncated) into an EPS file. That's what bothers me. I need the whole circle captured in a high-resolution image file.</p> <p>I am using python-2.7.4 on Ubuntu 13.04</p> <p>This is the code:</p> <pre><code>#!/usr/bin/python # set this to 1 to troubleshoot debug = 0 import turtle import math # image file with the result fname="dial.eps" # number of lines n = 100 # external radius r2 = 700 # length of each line l = round(r2 / 10) r1 = r2 - l # pen thickness # tuned for 50% fill factor at the inner end of each line # (dark stripe and transparent stripe have equal width there) thick = 2 * math.pi * r1 / float(2 * n) print "thickness =", thick # setup screen size to contain the whole circle, plus a little extra border = 20 + thick turtle.setup(2 * r2 + border, 2 * r2 + border) dot = turtle.Turtle() dot.speed(0) dot.hideturtle() # draw crosshairs in the center dot.setpos(l, 0) dot.setpos(-l, 0) dot.home() dot.setpos(0, l) dot.setpos(0, -l) dot.penup() # thickness of lines dot.pensize(thick) for step in range(0, n): a = 360.0 * step / float(n) arad = math.radians(a) x1 = r1 * math.cos(arad) y1 = r1 * math.sin(arad) x2 = r2 * math.cos(arad) y2 = r2 * math.sin(arad) if debug == 1: print "a =", a, "\t x1 =", x1, "\t y1 =", y1, "\t x2 =", x2, "\t y2 =", y2 dot.penup() dot.setpos(x1, y1) dot.pendown() dot.setpos(x2, y2) ts = turtle.getscreen() ts.getcanvas().postscript(file=fname) print "Saved image to: ", fname print "All done. Click image to exit." turtle.exitonclick() </code></pre>
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    1. USFlorin Andrei
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    1. COPrint `ts.getcanvas()._canvas.winfo_height()` & `ts.getcanvas()._canvas.winfo_width()` to verify the scale? And, you could use [this question's code](http://stackoverflow.com/questions/16424091/python-tkinter-gif-image-in-a-canvas), check if it works. The `postscript` was never designed to store raster images.
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    2. COcanvas width: 2046 canvas height: 933 Should have been both 2046. It looks like the vertical gets truncated because it's bigger than my screen.
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      1. POPython turtle.setup() truncates canvas to screen size - how to avoid that?
      1. USFlorin Andrei
    3. COTry using `tkinter.photoimage` mentioned in the above url. Maybe it will store whole image.
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