Remove VM Stats

runtime/bin/vmstats/bargraph.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-part of dart.vmstats;
-
-class BarGraph {
-  CanvasElement _canvas;
-  GraphModel _model;
-  List<Element> _elements;
-  double scaleHeight = 0;
-
-  static const int SAMPLE_WIDTH = 5;
-  static const int LEFT_MARGIN = 50;
-  static const int RIGHT_MARGIN = 150;
-  static const int LEGEND_WIDTH = 130;
-  static const int LEGEND_Y = 20;
-  static const int INSIDE_MARGIN = 2;
-  static const int LINE_WIDTH = 2;
-
-  static const int NUM_DIVIDERS = 5;
-  static const String FONT = "14px sans-serif";
-
-  BarGraph(this._canvas, this._elements) {
-    var maxElements =
-        (_canvas.width - LEFT_MARGIN - RIGHT_MARGIN) ~/ SAMPLE_WIDTH;
-    _model = new GraphModel(maxElements);
-    _model.addListener(drawGraph, null);
-    drawBarGraph();
- }
-
-  void addSample(List<int> segments) {
-    if (segments.length != _elements.length) {
-      throw new ArgumentError('invalid sample size for graph');
-    }
-    _model.addSample(segments);
-  }
-
-  void drawBarGraph() {
-    // Draw chart's outer box.
-    var context = _canvas.context2D;
-    context.beginPath();
-    context.strokeStyle = 'black';
-    // The '2's are the width of the line, even though 1 is specified.
-    context.strokeRect(
-        LEFT_MARGIN - 2, 1, _canvas.width - LEFT_MARGIN - RIGHT_MARGIN + 2,
-        _canvas.height - 2, 1);
-
-    // Draw legend.
-    var x = _canvas.width - LEGEND_WIDTH;
-    var y = LEGEND_Y;
-    context.font = FONT;
-    for (var i = _elements.length - 1; i >= 0; i--) {
-      context.fillStyle = _elements[i].color;
-      context.fillRect(x, y, 20, 20);
-      context.fillStyle = 'black';
-      context.fillText(_elements[i].name, x + 30, y + 15);
-      y += 30;
-    }
-  }
-
-  void drawGraph(GraphModel model) {
-    var graphHeight = model.maxTotal;
-    var width = _canvas.clientWidth;
-    var height = _canvas.clientHeight;
-    if (graphHeight >= scaleHeight) {
-      // Make scale height a bit higher to allow for growth, and
-      // round to nearest 100.
-      scaleHeight = graphHeight * 1.2;
-      scaleHeight = ((scaleHeight / 100).ceil() * 100);
-    }
-    var scale = height / scaleHeight;
-    drawValues(scaleHeight, scale);
-    drawChart(scaleHeight, scale);
-  }
-
-  void drawChart(int maxHeight, double scale) {
-    var dividerHeight = maxHeight ~/ NUM_DIVIDERS;
-    var context = _canvas.context2D;
-    context.beginPath();
-    var height = maxHeight.toInt();
-    var scaledY = dividerHeight * scale;
-
-    // Draw the vertical axis values and lines.
-    context.clearRect(0, 0, LEFT_MARGIN - INSIDE_MARGIN, maxHeight);
-    for (var i = 1; i < NUM_DIVIDERS; i++) {
-      height -= (dividerHeight ~/ 100) * 100;
-      context.font = FONT;
-      context.fillStyle = 'black';
-      context.textAlign = 'right';
-      context.textBaseline = 'middle';
-      context.fillText(height.toString(), LEFT_MARGIN - 10, scaledY);
-      context.moveTo(LEFT_MARGIN - INSIDE_MARGIN, scaledY);
-      context.strokeStyle = 'grey';
-      context.lineWidth = 0.5;
-      context.lineTo(_canvas.width - RIGHT_MARGIN, scaledY);
-      context.stroke();
-      scaledY += dividerHeight * scale;
-    }
-  }
-
-  void drawValues(int maxHeight, num scale) {
-    Iterator<Sample> iterator = _model.iterator;
-    var x = LEFT_MARGIN + INSIDE_MARGIN;
-    var y = INSIDE_MARGIN;
-    var w = _canvas.width - LEFT_MARGIN - RIGHT_MARGIN - INSIDE_MARGIN;
-    var h = (maxHeight * scale).ceil() - (2 * INSIDE_MARGIN);
-    _canvas.context2D.clearRect(x, y, w, h);
-
-    while (iterator.moveNext()) {
-      Sample s = iterator.current;
-      var y = INSIDE_MARGIN;
-      if (s != null) {
-        var blankHeight = scaleHeight - s.total();
-        drawVerticalSegment(x, y, SAMPLE_WIDTH, blankHeight, 'white', scale);
-        y += blankHeight;
-        for (int i = s.length - 1; i >= 0; i--) {
-          var h = s[i];
-          drawVerticalSegment(x, y, SAMPLE_WIDTH, h, _elements[i].color, scale);
-          y += s[i];
-        }
-      } else {
-        drawVerticalSegment(x, INSIDE_MARGIN, SAMPLE_WIDTH,
-            maxHeight, 'white', scale);
-      }
-      x += SAMPLE_WIDTH ;
-    }
-  }
-
-  void drawVerticalSegment(int x, int y, int w, int h, String color,
-                           num scale) {
-    var context = _canvas.context2D;
-    y = (y * scale).floor();
-    h = (h * scale).ceil();
-    context.beginPath();
-    context.lineWidth = w;
-    context.fillStyle = color;
-    context.strokeStyle = color;
-    if (x < INSIDE_MARGIN) {
-      x = INSIDE_MARGIN;
-    }
-    if (y < INSIDE_MARGIN) {
-      y = INSIDE_MARGIN;
-    }
-    var max = _canvas.height - INSIDE_MARGIN;
-    if ((y + h) > max) {
-      h = max - y;
-    }
-    context.moveTo(x, y);
-    context.lineTo(x, y + h);
-    context.stroke();
-  }
-}
-
-class GraphModel extends ObservableModel {
-  List<Sample> _samples = new List<Sample>();
-  int _maxSize;
-
-  static const int _LARGE_LENGTH = 999999999;
-
-  GraphModel(this._maxSize) {}
-
-  void addSample(List<int> segments) {
-    var len = _samples.length;
-    if (_samples.length >= _maxSize) {
-      _samples.remove(_samples.first);
-    }
-    _samples.add(new Sample(segments));
-    notifySuccess();
-  }
-
-  int get maxSize => _maxSize;
-
-  Iterator<Sample> get iterator => _samples.iterator;
-
-  Sample operator[](int i) => _samples[i];
-
-  /**
-   * Returns the minimum total from all the samples.
-   */
-  int get minTotal {
-    var min = _LARGE_LENGTH;
-    _samples.forEach((Sample s) => min = (s.total() < min ? s.total() : min));
-    return min;
-  }
-
-  /**
-   * Returns the maximum total from all the samples.
-   */
-  int get maxTotal {
-    var max = 1;  // Must be non-zero.
-    _samples.forEach((Sample s) => max = (s.total() > max ? s.total() : max));
-    return max;
-  }
-}
-
-/**
- * An element is a data type that gets charted. Each element has a name for
- * the legend, and a color for the bar graph. The number of elements in a
- * graph should match the number of segments in each sample.
- */
-class Element {
-  final String name;
-  final String color;  // Any description the DOM will accept, like "red".
-
-  Element(this.name, this.color) {}
-}
-
-/**
- * A sample is a list of segment lengths.
- */
-class Sample {
-  List<int> _segments;
-
-  Sample(this._segments) {}
-
-  int get length => _segments.length;
-  int operator[](int i) => _segments[i];
-
-  Iterator<int> get iterator => _segments.iterator;
-
-  int total() {
-    return _segments.fold(0, (int prev, int element) => prev + element);
-  }
-}