nanobench: add a cute bar chart
Give this a try? Helpful, or gets in the way?
BUG=skia:
R=krajcevski@google.com, mtklein@google.com
Author: mtklein@chromium.org
Review URL: https://codereview.chromium.org/390483002
diff --git a/tools/Stats.h b/tools/Stats.h
index 5128897..67bd45d 100644
--- a/tools/Stats.h
+++ b/tools/Stats.h
@@ -1,8 +1,13 @@
#ifndef Stats_DEFINED
#define Stats_DEFINED
+#include <math.h>
+
+#include "SkString.h"
#include "SkTSort.h"
+static const char* kBars[] = { "▁", "▂", "▃", "▄", "▅", "▆", "▇", "█" };
+
struct Stats {
Stats(const double samples[], int n) {
min = samples[0];
@@ -28,13 +33,25 @@
memcpy(sorted.get(), samples, n * sizeof(double));
SkTQSort(sorted.get(), sorted.get() + n - 1);
median = sorted[n/2];
+
+ for (int i = 0; i < n; i++) {
+ double s = samples[i];
+ // Normalize samples to [min, max] in as many quanta as we have distinct bars to print.
+ s -= min;
+ s /= (max - min);
+ s *= (SK_ARRAY_COUNT(kBars) - 1);
+ const size_t bar = (size_t)round(s);
+ SK_ALWAYSBREAK(bar < SK_ARRAY_COUNT(kBars));
+ plot.append(kBars[bar]);
+ }
}
double min;
double max;
- double mean; // Estimate of population mean.
- double var; // Estimate of population variance.
+ double mean; // Estimate of population mean.
+ double var; // Estimate of population variance.
double median;
+ SkString plot; // A single-line bar chart (_not_ histogram) of the samples.
};
#endif//Stats_DEFINED