Add --dpi flag to subunit2sql-graph

This commit adds a new flag, --dpi, to the subunit2sql-graph command.
This flag is used to specify a DPI for generated graph images.
Previously most graph commands hard coded the DPI to 900 (which is far
too high for most people) and others didn't specify one. This commit
changes that so it's user adjustable and consistent between all
commands.

Change-Id: I5c8c48bda18daff11d6069c35451d932ffe4e33b

releasenotes/notes/dpi-cli-flag-64552fd0e10e5d91.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - Add a new CLI flag, --dpi, for subunit2sql-graph to adjust the output image
+    DPI for the generated graphs.

subunit2sql/analysis/agg_count.py

@@ -78,4 +78,4 @@ def generate_series():
     df = pd.DataFrame.from_dict(test_dict, orient='index')
     plot = df.plot(kind='barh', stacked=True).set_title(title)
     fig = plot.get_figure()
-    fig.savefig(CONF.output)
+    fig.savefig(CONF.output, dpi=CONF.dpi)

subunit2sql/analysis/dailycount.py

@@ -84,4 +84,4 @@ def generate_series():
                      upper_std_dev[10:],
                      color='b', alpha=0.2, label='Std Dev')
     plt.legend()
-    plt.savefig(CONF.output, dpi=900)
+    plt.savefig(CONF.output, dpi=CONF.dpi)

subunit2sql/analysis/failures.py

@@ -75,5 +75,5 @@ def generate_series():
     print('Success Percentage: %.4f%%' % percent(success_count, run_count))
     print('Skip Percentage: %.4f%%' % percent(skip_count, run_count))
     fig = plot.get_figure()
-    fig.savefig(CONF.output)
+    fig.savefig(CONF.output, dpi=CONF.dpi)
     return ts

subunit2sql/analysis/graph.py

@@ -43,6 +43,8 @@ SHELL_OPTS = [
     cfg.StrOpt('stop-date', short='s',
                help='Stop date for the graph only data from before this date '
                     'will be used. Uses ISO 8601 format: 1914-06-28'),
+    cfg.IntOpt('dpi', default=900,
+               help='Image DPI to use for the output graph images')
 ]
 
 

subunit2sql/analysis/run_failure_rate.py

@@ -74,4 +74,4 @@ def generate_series():
     locs, labels = plt.yticks(range(len(perc_data)), list(perc_data.keys()))
     plt.xlabel('Failure Percentage')
     plt.tight_layout()
-    plt.savefig(CONF.output, dpi=900)
+    plt.savefig(CONF.output, dpi=CONF.dpi)

subunit2sql/analysis/run_time.py

@@ -79,5 +79,5 @@ def generate_series():
                      lower_std_dev, color='b', alpha=0.2,
                      label='std dev')
     plt.legend()
-    plt.savefig(CONF.output, dpi=900)
+    plt.savefig(CONF.output, dpi=CONF.dpi)
     return ts

subunit2sql/analysis/run_time_meta.py

@@ -68,4 +68,4 @@ def generate_series():
     df.plot(kind='box', rot=90)
     plt.ylabel('Time (sec.)')
     plt.tight_layout()
-    plt.savefig(CONF.output, dpi=900)
+    plt.savefig(CONF.output, dpi=CONF.dpi)

subunit2sql/analysis/test_run_time.py

@@ -63,4 +63,4 @@ def generate_series():
     df.plot(kind='box', rot=90)
     plt.ylabel('Time (sec.)')
     plt.tight_layout()
-    plt.savefig(CONF.output, dpi=900)
+    plt.savefig(CONF.output, dpi=CONF.dpi)