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This sample now uses a locally installed copy of Graphviz to produce an image, instead of relying on a public 'webdot' server which no longer exists.
43 lines
1.3 KiB
Python
43 lines
1.3 KiB
Python
"""
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Viewing a reaction path diagram.
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This script uses Graphviz to generate an image. You must have Graphviz installed
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and the program 'dot' must be on your path for this example to work.
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Graphviz can be obtained from http://www.graphviz.org/ or (possibly) installed
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using your operating system's package manager.
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"""
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import os
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import sys
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from Cantera import *
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from Cantera import rxnpath
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#-----------------------------------------------------------------------
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# these lines can be replaced by any commands that generate
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# an object of a class derived from class Kinetics (such as IdealGasMix)
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# in some state.
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gas = GRI30()
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gas.setState_TPX(2500.0, OneAtm, 'CH4:0.4, O2:1, N2:3.76')
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gas.equilibrate('TP')
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gas.setTemperature(500.0)
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#------------------------------------------------------------------------
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d = rxnpath.PathDiagram(title = 'reaction path diagram following N',
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bold_color = 'green')
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element = 'N'
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dot_file = 'rxnpath2.dot'
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img_file = 'rxnpath2.png'
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img_path = os.path.join(os.getcwd(), img_file)
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rxnpath.write(gas, element, dot_file, d)
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print "Wrote graphviz input file to '%s'." % os.path.join(os.getcwd(), dot_file)
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os.system('dot %s -Tpng -o%s -Gdpi=200' % (dot_file, img_file))
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print "Wrote graphviz output file to '%s'." % img_path
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if len(sys.argv) > 1 and sys.argv[1] == "-view":
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rxnpath.view('file:///' + img_path)
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