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+--- Thread: matplotlib barh y tick alignment (/thread-349.html)
matplotlib barh y tick alignment - iFunKtion - Oct-06-2016
Hi,
Can't seem to get the y tick labels to line up nicely on the horizontal bar chart in this sub plotted chart (bottom chart). I have found various references to alignment but can't get anything to work, here is the code, the data is a simple two column delimited text file comprising of a name and a number from 1 to 6 delimited with a comma and no white space. The Second chart, the one in question, simply takes the total of all the values in the upper graph and adds them together, I hope it's fairly obvious:
#!/usr/bin/python3 # aniMat.py # Testing out updating live charts with MatPlotLib library. import matplotlib.pyplot as plt import matplotlib.animation as animation from matplotlib import style style.use('ggplot') # style sheet used as grid is handy troubleshooting info. fig = plt.figure() ax1 = plt.subplot2grid((8,1), (0,0), rowspan=3, colspan=1) ax2 = plt.subplot2grid((8,1), (4,0), rowspan=1, colspan=1) bar_width = 0.6 def animate(i): # Data is taken from simple two column text file of a string and an in # separated by a comma and no white space. String data is pulled into xar_labels # and an integer range has been generated for the initial x-axis. pullData = open('./data_sets/sample.txt', 'r').read() dataArray = pullData.split('\n') xar = [] xar_labels = [] yar = [] xhar = [0, 1] yhar = [40, 0] t_used = 0 n = 0 rflag = False aflag = False # rag refers to 'red', 'amber', 'green' status, color 'orange is used but label remains 'amber' # Chart is designed to quickly see if any one customer goes above the allocation. rag_array = [] for eachLine in dataArray: if len(eachLine)>1: x, y = eachLine.split(',') xar_labels.append(str(x)) xar.append(int(n)) print(xar) print(xar_labels) yar.append(int(y)) t_used = t_used + int(y) n = n + 1 if int(y) < 4: rag = 'green' elif int(y) == 4: rag = 'orange' aflag = True else: rag = 'red' rflag = True rag_array.append(rag) ax1.clear() ax2.clear() ax1.bar(xar, yar, bar_width, align='center', color=rag_array) # Put align parameter in here following matplotlib documentation examples ax1.set_xticks(xar, xar_labels) ax1.set_title('Tyres') ax1.set_ylim(0, 6) ax1.set_ylabel('Tyres Used') ax1.set_xlabel('VIN Number') yhar = [40, t_used] if rflag: rag_sets = 'red' elif aflag: rag_sets = 'orange' else: rag_sets = 'green' ax2.barh(xhar, yhar, color=['grey', rag_sets]) ax2.set_xlabel('Number of Sets') ax2.set_xlim(0, 50) ax2.set_ylim(0, 2) ani = animation.FuncAnimation(fig,animate, interval=1000) plt.show()regardsiFunk
RE: matplotlib barh y tick alignment - Larz60+ - Oct-06-2016
And here's the post for Y axis:
http://stackoverflow.com/questions/23637219/center-align-tick-labels-of-matplotlib-heatmap
RE: matplotlib barh y tick alignment - iFunKtion - Oct-06-2016
Yes I found that, but it covers the x axis which is fine, not the y axis which is causing the problem, the tick marks line up to the top of the bar, not the middle of it and looks a bit strange.
Ok, I've found solved this/found workaround for this. It's not the most intuitive, but I reset the xticks to [0,1] instead of [0,2] with the view that having the tick labels below the bar on a horizontal chart would look better, and then the align parameter worked:
ax2.barh(xhar, yhar, align='center', color=['grey', rag_sets]) # align parameter now works ax2.set_xlabel('Number of Sets') ax2.set_xlim(0, 50) ax2.set_yticks([0, 1]) # so long as the ticks are set in this way ax2.set_yticklabels(tyreStock)iFunk