Visualization tool for WebrtcEventLogs

webrtc/tools/event_log_visualizer/plot_base.h

+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#ifndef WEBRTC_TOOLS_EVENT_LOG_VISUALIZER_PLOT_BASE_H_
+#define WEBRTC_TOOLS_EVENT_LOG_VISUALIZER_PLOT_BASE_H_
+
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace webrtc {
+namespace plotting {
+
+enum PlotStyle { LINE_GRAPH, BAR_GRAPH };
+
+struct TimeSeriesPoint {
+  TimeSeriesPoint(float x, float y) : x(x), y(y) {}
+  TimeSeriesPoint(float x, float y, std::string message)
+      : x(x), y(y), message(message) {}
+  float x;
+  float y;
+  std::string message;
+};
+
+struct TimeSeries {
+  std::string label;
+  PlotStyle style;
+  std::vector<TimeSeriesPoint> points;
+  void swap(TimeSeries& other) {
+    std::swap(label, other.label);
+    std::swap(style, other.style);
+    std::swap(points, other.points);
+  }
+};
+
+// This is basically a struct that represents of a general graph, with axes,
+// title and one or more data series. We make it a class only to document that
+// it also specifies an interface for the draw()ing objects.
+class Plot {
+ public:
+  virtual ~Plot() {}
+  virtual void draw() = 0;
+
+  float xaxis_min;

[stefan-webrtc, 2016/06/29 11:13:05]

Can these be protected and only set in the constructor?

[terelius, 2016/07/06 15:15:12]

No, the axis limits depend on the data points which aren't
known when the object is constructed.

+  float xaxis_max;
+  std::string xaxis_label;
+  float yaxis_min;
+  float yaxis_max;
+  std::string yaxis_label;
+  std::vector<TimeSeries> series;
+  std::string title;
+};
+
+class PlotCollection {
+ public:
+  virtual ~PlotCollection() {}
+  virtual void draw() = 0;
+  virtual Plot* append_new_plot() = 0;
+
+ protected:
+  std::vector<std::unique_ptr<Plot> > plots;
+};
+
+}  // namespace plotting
+}  // namespace webrtc
+
+#endif  // WEBRTC_TOOLS_EVENT_LOG_VISUALIZER_PLOT_BASE_H_