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Open Source Computer Vision Library
https://opencv.org/
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96 lines
2.4 KiB
96 lines
2.4 KiB
15 years ago
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#! /usr/bin/env python
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"""
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This script will test highgui's trackbar functionality
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"""
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# name if this test and it's requirements
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TESTNAME = "cvCreateTrackbar"
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REQUIRED = ["cvShowImage"]
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# needed for sys.exit(int) and .works file handling
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import os
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import sys
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import works
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# check requirements and delete old flag file, if it exists
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if not works.check_files(REQUIRED,TESTNAME):
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sys.exit(77)
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# import the necessary things for OpenCV
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from highgui import *
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from cv import *
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# some definitions
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win_name = "testing..."
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bar_name = "brightness"
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bar_count= 100
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# position of imagefiles we need
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PREFIX=os.path.join(os.environ["srcdir"],"../../opencv_extra/testdata/python/images/")
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# 'moved' indicates if trackbar has been moved
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moved = False
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# 'range' indicates if trackbar was outside range [0..bar_count]
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range = False
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# function to call on a trackbar event
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def trackcall( p ):
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# Trackbar position must be in [0..bar_count]
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if (p > bar_count or p < 0):
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globals()["range"] = True
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cvConvertScale( image, image2,float(p)/float(bar_count) )
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cvShowImage( win_name, image2 );
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globals()["moved"] = True
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# create output window
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cvNamedWindow(win_name,CV_WINDOW_AUTOSIZE)
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image = cvLoadImage(PREFIX+"cvCreateTrackbar.jpg")
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image2 = cvLoadImage(PREFIX+"cvCreateTrackbar.jpg")
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cvShowImage(win_name,image)
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# create the trackbar and save return value
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res = cvCreateTrackbar( bar_name, win_name, 0, bar_count, trackcall )
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# check return value
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if res == 0:
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# something went wrong, so return an error code
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print "(ERROR) Couldn't create trackbar."
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sys.exit(1)
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# init. window with image
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trackcall(bar_count/2)
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# reset 'moved' indicator
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moved = False
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# now give the user 20 seconds to do some input
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print "(INFO) Please move trackbar within the next 20 SECONDS to 'PASS' this test."
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print "(HINT) You can complete this test prematurely by pressing any key."
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print "(INFO) In the case of no user input, the test will be remarked as 'FAIL'."
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key = cvWaitKey(20000)
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if range:
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# trackbar position value was outside allowed range [0..bar_count]
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print "(ERROR) Trackbar position was outside range."
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sys.exit(1)
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if not moved and (key==-1):
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# trackbar has not been moved
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print "(ERROR) No user input detected."
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sys.exit(1)
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elif not moved and (key>0):
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# 20sec. passed, trackbar has been moved
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print "(INFO) No trackbar movement detected (but key pressed)."
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sys.exit(77)
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# create flag file for following tests
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works.set_file(TESTNAME)
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# return 0 ('PASS')
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sys.exit(0)
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