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1 parent 660df1b commit f0e2fe01ba5592489bfaf521ee90355afb29bb49 @andymckay committed Mar 2, 2012
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2 confoo-2012/pace_example/app.py
@@ -12,7 +12,7 @@
def listener(websocket):
sub = redis.Redis().pubsub()
- sub.subscribe('testing')
+ sub.subscribe('ecg')
for message in sub.listen():
websocket.send(message['data'])
View
22 confoo-2012/pace_example/static/pace.js
@@ -1,7 +1,27 @@
+var smoothie_ecg1 = new SmoothieChart(),
+ smoothie_ecg2 = new SmoothieChart(),
+ ecg1 = new TimeSeries,
+ ecg2 = new TimeSeries;
+
+smoothie_ecg1.addTimeSeries(ecg1, {
+ strokeStyle:'rgb(0, 255, 0)',
+ fillStyle:'rgba(0, 255, 0, 0.4)',
+ lineWidth:3 });
+
+smoothie_ecg2.addTimeSeries(ecg2, {
+ strokeStyle:'rgb(255, 0, 255)',
+ fillStyle:'rgba(255, 0, 255, 0.4)',
+ lineWidth:3 });
+
$(document).ready(function(){
var ws = new WebSocket($('body').attr('data-web-socket'));
+ smoothie_ecg1.streamTo(document.getElementById("ecg1"));
+ smoothie_ecg2.streamTo(document.getElementById("ecg2"));
+
ws.onmessage = function (msg) {
- $('body').append($('<p>', {'text': msg.data}));
+ var out = msg.data.split('|');
+ ecg1.append(parseFloat(out[0]), parseFloat(out[1]));
+ ecg2.append(parseFloat(out[0]), parseFloat(out[2]));
};
ws.onopen = function() {
ws.send('connected');
View
291 confoo-2012/pace_example/static/smoothie.js
@@ -0,0 +1,291 @@
+// MIT License:
+//
+// Copyright (c) 2010-2011, Joe Walnes
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+/**
+ * Smoothie Charts - http://smoothiecharts.org/
+ * (c) 2010, Joe Walnes
+ *
+ * v1.0: Main charting library, by Joe Walnes
+ * v1.1: Auto scaling of axis, by Neil Dunn
+ * v1.2: fps (frames per second) option, by Mathias Petterson
+ * v1.3: Fix for divide by zero, by Paul Nikitochkin
+ * v1.4: Set minimum, top-scale padding, remove timeseries, add optional timer to reset bounds, by Kelley Reynolds
+ * v1.5: Set default frames per second to 50... smoother.
+ * .start(), .stop() methods for conserving CPU, by Dmitry Vyal
+ * options.iterpolation = 'bezier' or 'line', by Dmitry Vyal
+ * options.maxValue to fix scale, by Dmitry Vyal
+ * v1.6: minValue/maxValue will always get converted to floats, by Przemek Matylla
+ */
+
+function TimeSeries(options) {
+ options = options || {};
+ options.resetBoundsInterval = options.resetBoundsInterval || 3000; // Reset the max/min bounds after this many milliseconds
+ options.resetBounds = options.resetBounds || true; // Enable or disable the resetBounds timer
+ this.options = options;
+ this.data = [];
+
+ this.maxValue = Number.NaN; // The maximum value ever seen in this time series.
+ this.minValue = Number.NaN; // The minimum value ever seen in this time series.
+
+ // Start a resetBounds Interval timer desired
+ if (options.resetBounds) {
+ this.boundsTimer = setInterval(function(thisObj) { thisObj.resetBounds(); }, options.resetBoundsInterval, this);
+ }
+}
+
+// Reset the min and max for this timeseries so the graph rescales itself
+TimeSeries.prototype.resetBounds = function() {
+ this.maxValue = Number.NaN;
+ this.minValue = Number.NaN;
+ for (var i = 0; i < this.data.length; i++) {
+ this.maxValue = !isNaN(this.maxValue) ? Math.max(this.maxValue, this.data[i][1]) : this.data[i][1];
+ this.minValue = !isNaN(this.minValue) ? Math.min(this.minValue, this.data[i][1]) : this.data[i][1];
+ }
+};
+
+TimeSeries.prototype.append = function(timestamp, value) {
+ this.data.push([timestamp, value]);
+ this.maxValue = !isNaN(this.maxValue) ? Math.max(this.maxValue, value) : value;
+ this.minValue = !isNaN(this.minValue) ? Math.min(this.minValue, value) : value;
+};
+
+function SmoothieChart(options) {
+ // Defaults
+ options = options || {};
+ options.grid = options.grid || { fillStyle:'#000000', strokeStyle: '#777777', lineWidth: 1, millisPerLine: 1000, verticalSections: 2 };
+ options.millisPerPixel = options.millisPerPixel || 20;
+ options.fps = options.fps || 50;
+ options.maxValueScale = options.maxValueScale || 1;
+ options.minValue = options.minValue;
+ options.maxValue = options.maxValue;
+ options.labels = options.labels || { fillStyle:'#ffffff' };
+ options.interpolation = options.interpolation || "bezier";
+ this.options = options;
+ this.seriesSet = [];
+}
+
+SmoothieChart.prototype.addTimeSeries = function(timeSeries, options) {
+ this.seriesSet.push({timeSeries: timeSeries, options: options || {}});
+};
+
+SmoothieChart.prototype.removeTimeSeries = function(timeSeries) {
+ this.seriesSet.splice(this.seriesSet.indexOf(timeSeries), 1);
+};
+
+SmoothieChart.prototype.streamTo = function(canvas, delay) {
+ var self = this;
+ this.render_on_tick = function() {
+ self.render(canvas, new Date().getTime() - (delay || 0));
+ };
+
+ this.start();
+};
+
+SmoothieChart.prototype.start = function() {
+ if (!this.timer)
+ this.timer = setInterval(this.render_on_tick, 1000/this.options.fps);
+};
+
+SmoothieChart.prototype.stop = function() {
+ if (this.timer) {
+ clearInterval(this.timer);
+ this.timer = undefined;
+ }
+};
+
+SmoothieChart.prototype.render = function(canvas, time) {
+ var canvasContext = canvas.getContext("2d");
+ var options = this.options;
+ var dimensions = {top: 0, left: 0, width: canvas.clientWidth, height: canvas.clientHeight};
+
+ // Save the state of the canvas context, any transformations applied in this method
+ // will get removed from the stack at the end of this method when .restore() is called.
+ canvasContext.save();
+
+ // Round time down to pixel granularity, so motion appears smoother.
+ time = time - time % options.millisPerPixel;
+
+ // Move the origin.
+ canvasContext.translate(dimensions.left, dimensions.top);
+
+ // Create a clipped rectangle - anything we draw will be constrained to this rectangle.
+ // This prevents the occasional pixels from curves near the edges overrunning and creating
+ // screen cheese (that phrase should neeed no explanation).
+ canvasContext.beginPath();
+ canvasContext.rect(0, 0, dimensions.width, dimensions.height);
+ canvasContext.clip();
+
+ // Clear the working area.
+ canvasContext.save();
+ canvasContext.fillStyle = options.grid.fillStyle;
+ canvasContext.fillRect(0, 0, dimensions.width, dimensions.height);
+ canvasContext.restore();
+
+ // Grid lines....
+ canvasContext.save();
+ canvasContext.lineWidth = options.grid.lineWidth || 1;
+ canvasContext.strokeStyle = options.grid.strokeStyle || '#ffffff';
+ // Vertical (time) dividers.
+ if (options.grid.millisPerLine > 0) {
+ for (var t = time - (time % options.grid.millisPerLine); t >= time - (dimensions.width * options.millisPerPixel); t -= options.grid.millisPerLine) {
+ canvasContext.beginPath();
+ var gx = Math.round(dimensions.width - ((time - t) / options.millisPerPixel));
+ canvasContext.moveTo(gx, 0);
+ canvasContext.lineTo(gx, dimensions.height);
+ canvasContext.stroke();
+ canvasContext.closePath();
+ }
+ }
+
+ // Horizontal (value) dividers.
+ for (var v = 1; v < options.grid.verticalSections; v++) {
+ var gy = Math.round(v * dimensions.height / options.grid.verticalSections);
+ canvasContext.beginPath();
+ canvasContext.moveTo(0, gy);
+ canvasContext.lineTo(dimensions.width, gy);
+ canvasContext.stroke();
+ canvasContext.closePath();
+ }
+ // Bounding rectangle.
+ canvasContext.beginPath();
+ canvasContext.strokeRect(0, 0, dimensions.width, dimensions.height);
+ canvasContext.closePath();
+ canvasContext.restore();
+
+ // Calculate the current scale of the chart, from all time series.
+ var maxValue = Number.NaN;
+ var minValue = Number.NaN;
+
+ for (var d = 0; d < this.seriesSet.length; d++) {
+ // TODO(ndunn): We could calculate / track these values as they stream in.
+ var timeSeries = this.seriesSet[d].timeSeries;
+ if (!isNaN(timeSeries.maxValue)) {
+ maxValue = !isNaN(maxValue) ? Math.max(maxValue, timeSeries.maxValue) : timeSeries.maxValue;
+ }
+
+ if (!isNaN(timeSeries.minValue)) {
+ minValue = !isNaN(minValue) ? Math.min(minValue, timeSeries.minValue) : timeSeries.minValue;
+ }
+ }
+
+ if (isNaN(maxValue) && isNaN(minValue)) {
+ return;
+ }
+
+ // Scale the maxValue to add padding at the top if required
+ if (options.maxValue != null)
+ maxValue = options.maxValue;
+ else
+ maxValue = maxValue * options.maxValueScale;
+ // Set the minimum if we've specified one
+ if (options.minValue != null)
+ minValue = options.minValue;
+ var valueRange = maxValue - minValue;
+
+ // For each data set...
+ for (var d = 0; d < this.seriesSet.length; d++) {
+ canvasContext.save();
+ var timeSeries = this.seriesSet[d].timeSeries;
+ var dataSet = timeSeries.data;
+ var seriesOptions = this.seriesSet[d].options;
+
+ // Delete old data that's moved off the left of the chart.
+ // We must always keep the last expired data point as we need this to draw the
+ // line that comes into the chart, but any points prior to that can be removed.
+ while (dataSet.length >= 2 && dataSet[1][0] < time - (dimensions.width * options.millisPerPixel)) {
+ dataSet.splice(0, 1);
+ }
+
+ // Set style for this dataSet.
+ canvasContext.lineWidth = seriesOptions.lineWidth || 1;
+ canvasContext.fillStyle = seriesOptions.fillStyle;
+ canvasContext.strokeStyle = seriesOptions.strokeStyle || '#ffffff';
+ // Draw the line...
+ canvasContext.beginPath();
+ // Retain lastX, lastY for calculating the control points of bezier curves.
+ var firstX = 0, lastX = 0, lastY = 0;
+ for (var i = 0; i < dataSet.length; i++) {
+ // TODO: Deal with dataSet.length < 2.
+ var x = Math.round(dimensions.width - ((time - dataSet[i][0]) / options.millisPerPixel));
+ var value = dataSet[i][1];
+ var offset = maxValue - value;
+ var scaledValue = valueRange ? Math.round((offset / valueRange) * dimensions.height) : 0;
+ var y = Math.max(Math.min(scaledValue, dimensions.height - 1), 1); // Ensure line is always on chart.
+
+ if (i == 0) {
+ firstX = x;
+ canvasContext.moveTo(x, y);
+ }
+ // Great explanation of Bezier curves: http://en.wikipedia.org/wiki/B�zier_curve#Quadratic_curves
+ //
+ // Assuming A was the last point in the line plotted and B is the new point,
+ // we draw a curve with control points P and Q as below.
+ //
+ // A---P
+ // |
+ // |
+ // |
+ // Q---B
+ //
+ // Importantly, A and P are at the same y coordinate, as are B and Q. This is
+ // so adjacent curves appear to flow as one.
+ //
+ else {
+ switch (options.interpolation) {
+ case "line":
+ canvasContext.lineTo(x,y);
+ break;
+ case "bezier":
+ default:
+ canvasContext.bezierCurveTo( // startPoint (A) is implicit from last iteration of loop
+ Math.round((lastX + x) / 2), lastY, // controlPoint1 (P)
+ Math.round((lastX + x)) / 2, y, // controlPoint2 (Q)
+ x, y); // endPoint (B)
+ break;
+ }
+ }
+
+ lastX = x, lastY = y;
+ }
+ if (dataSet.length > 0 && seriesOptions.fillStyle) {
+ // Close up the fill region.
+ canvasContext.lineTo(dimensions.width + seriesOptions.lineWidth + 1, lastY);
+ canvasContext.lineTo(dimensions.width + seriesOptions.lineWidth + 1, dimensions.height + seriesOptions.lineWidth + 1);
+ canvasContext.lineTo(firstX, dimensions.height + seriesOptions.lineWidth);
+ canvasContext.fill();
+ }
+ canvasContext.stroke();
+ canvasContext.closePath();
+ canvasContext.restore();
+ }
+
+ // Draw the axis values on the chart.
+ if (!options.labels.disabled) {
+ canvasContext.fillStyle = options.labels.fillStyle;
+ var maxValueString = parseFloat(maxValue).toFixed(2);
+ var minValueString = parseFloat(minValue).toFixed(2);
+ canvasContext.fillText(maxValueString, dimensions.width - canvasContext.measureText(maxValueString).width - 2, 10);
+ canvasContext.fillText(minValueString, dimensions.width - canvasContext.measureText(minValueString).width - 2, dimensions.height - 2);
+ }
+
+ canvasContext.restore(); // See .save() above.
+}
View
7 confoo-2012/pace_example/templates/index.html
@@ -1,11 +1,14 @@
<!DOCTYPE HTML>
<html>
<head>
- <title>Hello</title>
+ <title>Pace</title>
<script type="text/javascript" src="{{ url_for('static', filename='jquery-1.4.2.min.js') }}"></script>
+ <script type="text/javascript" src="{{ url_for('static', filename='smoothie.js') }}"></script>
<script type="text/javascript" src="{{ url_for('static', filename='pace.js') }}"></script>
</head>
<body data-web-socket="ws://{{ request.host }}{{ url_for('.api') }}">
- <p>Hello World!</p>
+ <h2>Sample Data</h2>
+ <div><canvas id="ecg1" width="400" height="100"></canvas></div>
+ <div><canvas id="ecg2" width="400" height="100"></canvas></div>
</body>
</html>

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