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data_graph.js
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data_graph.js
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/* Interface to the main graph
* This graph contains the clickable canvas, data points,
* fit lines, and any HUDs
*/
dataGraph = function(container) {
var xyData, llmseFit, xPowers = [1];
var thePlot, descent, huds;
var divs;
var descent = gradientDescent(1);
function getDiv(name) { return $("#" + name); }
function getDescent() { return descent; }
function getXYData() { return xyData; }
function getLlmseFit() { return llmseFit; }
function initialize(container) {
divs = {
main: getDiv("mainGraph"),
aux: getDiv("auxGraphs"),
clear: getDiv("btn_clear"),
descend: getDiv("btn_descend"),
maxN: getDiv("text_maxN")
}
divs["main"].bind("plotclick", function(event, pos, item){
pushData(pos.x, pos.y);
});
$(document).on("click", "#btn_clear", clearData)
$(document).on("click", "#btn_descend", toggleDescent)
$(document).on("change", "#text_maxN", updateData)
// divs["clear"].click(clearData);
// divs["descend"].click(toggleDescent);
// divs["maxN"].change(updateData);
huds = [];
clearData();
}
function linkHUD(hud) {
huds.push(hud);
}
function pushData(x,y) {
xyData.push([x, y]);
updateData();
}
function toggleDescent() {
var descentEnabled = $("#btn_descend").attr("data-enabled");
if (descentEnabled === "off") {
descentTimer = setInterval(descend, 20);
descentEnabled = "on";
divs["descend"].find("svg").html("<span class='fa fa-pause-circle'></span>")
} else {
clearInterval(descentTimer);
descentEnabled = "off";
divs["descend"].find("svg").html("<span class='fa fa-arrow-alt-circle-down'></span>")
}
divs["descend"].attr("data-enabled", descentEnabled);
}
// generate callback for "the data has changed"
function updateData() {
xyData = pruneData(xyData);
llmseFit = xyHelper.llmse(xyData, xPowers);
update();
}
// run n iterations given current data
function descend(n) {
data = xyHelper.trainingData(xyData, xPowers);
descent.setData(data.features, data.outcomes);
descent.step();
update();
}
function clearData() {
xyData = [];
updateData();
}
// general function to plot data and any fit lines
function update() {
// plot options
var options = {
grid: {clickable: true},
xaxis: {min: -1, max: 1},
yaxis: {min: -1, max: 1}
};
// Add data points to plot data
var series = [{
data: xyData,
points: {show: true},
color: "blue"
}];
// add llmse fit line if it exists
if (llmseFit) {
var fitData = getFitPlotData(llmseFit);
series.push({
data: fitData,
lines: {show: true},
color: "red",
label: "LMSE fit"
});
}
// add descent fit line if it exists
if (descent.getNumObservations() > 0) {
var fitData = getFitPlotData(descent.getTheta());
series.push({
data: fitData,
lines: {show: true},
color: "orange",
label: "model fit"
});
}
thePlot = plot(series, options);
huds.forEach(function(hud){hud.update()});
return thePlot;
}
function plot(series, options) {
return $.plot(divs["main"], series, options);
}
// limit to manN data points
function pruneData(xyData) {
while (xyData.length > Number(divs["maxN"].val())) {xyData.shift()};
return xyData
}
// return x,y data for llmse fit
function getFitPlotData(coefs) {
if (thePlot == undefined) { return []; }
if (!coefs || coefs.size()[0]==0 || coefs.size()[1]==0) { return []; }
var xMin = thePlot.getAxes().xaxis.min;
var xMax = thePlot.getAxes().xaxis.max;
return xyHelper.getFitLine(coefs, xPowers, xMin, xMax, 50)
}
initialize(container);
return {
linkHUD: linkHUD,
getDescent: getDescent,
getXYData: getXYData,
getLlmseFit: getLlmseFit,
pushData: pushData,
toggleDescent: toggleDescent,
updateData: updateData,
descend: descend,
clearData: clearData,
update: update,
pruneData: pruneData,
getFitPlotData: getFitPlotData,
huds: huds,
}
}