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d3.tsline.js
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d3.tsline.js
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function d3_tsline(id) {
var self = this;
self.selector = id || "#chart";
self.series = []; // series metadata
self.data = []; // series data
self.view_data = []; // view window data
self.domain = {
view: { x: [0,0], y: [0,0] },
summary: { x: [0,0], y: [0,0] }
};
self.width = 1000;
self.height = 400;
self.summary_height = 50;
self.handle_height = 14;
self.view_span = 64; // view_span (in data points)
// buffer (in px) for showing a bit more y axis than min/max values
self.y_nice_buffer = 2;
self.orient_y = "right";
self.interpolation = 'cardinal';
self.tension = 0.8;
self.scroll_view = true;
self.scroll_delay = 1000; // in ms
self.iters = 0;
// slider dimensions (in px)
self.slider = {
x: 729,
w: 171,
max_x: 729
};
// sizer values
self.sizer_width = 9;
self.left = {
x: 0
};
self.right = {
x: 0
};
//
// functions
//
// ctor, called upon instantiation
self.init = function() {
self.build_dom();
};
// override this to shape your data to what d3-tsline wants
// which is [ series, series, ... ]
// and a series is: [ [epoch, value], [epoch, value], ... ]
self.format_data = function(data) {
// this default implementation assumes data is in proper format already
return data;
};
self.parse_date = function(dt) { return dt; }; // js Date object
//self.parse_date = function(dt) { return new Date(dt*1000); }; // epoch
//self.parse_date = function(dt) {
// d3.time.format("%b %d, %Y").parse(dt); // mon d, yyyy
//}
self.parse_val = function(val) { return val; };
self.parse_all_data = function() {
// Parse dates and numbers. We assume values are sorted by date.
self.data.forEach(function(series) {
series.forEach(function(d) {
d = self.parse_point(d);
});
});
};
self.parse_point = function(pt) {
pt[0] = self.parse_date(pt[0]);
pt[1] = self.parse_val(pt[1]);
return pt;
};
// TODO: setSeries() and detect when it's a single series and add the []
self.setSeriesData = function(data) {
data = self.format_data(data);
data.forEach(function(series) {
series.forEach(function(point) {
point = self.parse_point(point);
});
});
self.data = data;
self.set_domain("summary", data);
};
// add a new point to each series, and redraw if update==true
self.addSeriesPoints = function(points, update) {
if( points ) {
points = self.format_data(points);
var i=0;
points.forEach(function(point) {
point = self.parse_point(point);
self.update_domain("summary", point);
self.data[i++].push(point);
});
}
if( update ) self.update();
};
self.update = function() {
self.render();
self.move_scroller();
};
self.move_scroller = function() {
if( self.iters++ > 100 ) return;
var diff = self.get_diff(self.width, self.view_data);
// scroll_diff accounts for x() scale function in draw_view()
// which renders the entire line one point wider to scroll smoothly
var scroll_diff = 0;//diff;//self.get_diff(self.width + diff, self.view_data);
d3.select(self.selector + " .view .scroller")
.attr("transform", "translate(" + 0 + ")")
.transition()
.ease("linear")
.duration(self.scroll_delay)
.attr("transform", "translate(" + -1 * scroll_diff + ")")
.each("end", function() {
self.addSeriesPoints(self.next_pts, true);
});
};
// calcs for view window and slider
self.update_view_calcs = function() {
view_end = self.data[0].length || 0;
view_start = ((view_end - self.view_span) < 0)
? 0 : view_end - self.view_span;
// make view window slice data arrays (one per series)
var data = [];
var toAppend;
self.data.forEach(function(series) {
toAppend = series.slice(view_start, view_end);
data.push(toAppend );
});
self.view_data = data;
// note: set_domain gets expensive for updates/renders as the view
// dataset gets larger
self.set_domain("view", data);
/*
self.slider.w = Math.round(self.width *
(self.view_span / self.data[0].length));
self.slider.x = self.slider.max_x = self.width - self.slider.w;
if( self.slider.x < 0 ) {
self.slider.w = self.width;
self.slider.x = self.slider.max_x = 0;
}
*/
};
self.get_diff = function(w, data) {
return w / data[0].length;
};
self.render = function() {
if( !self.is_valid( self.series ) ) return;
self.update_view_calcs();
self.draw_view();
//self.draw_summary();
};
self.is_valid = function(arr) {
if( arr == null ) return false;
if( arr.length == 0 ) return false;
return true;
};
self.build_dom = function() {
d3.select(this.selector)
.append("div")
.attr("class", "view");
d3.select(this.selector)
.append("div")
.attr("class", "summary");
};
// if we have fewer data points than self.view_span, fill in data to left
// so the chart seems to start from the right and scroll left
self.fill_left_pts = function(interval, fill_value, seed_x) {
// handle when no data set, make blank series data for each series
if( !self.data || !self.data[0] ) {
self.data = [];
// TODO: handle when no series are set either
self.series.forEach(function(series) {
self.data.push( [] );
});
}
var len = self.data[0].length;
var min_x = 0;
try {
min_x = self.data[0][0][0].valueOf();
} catch(e) {
min_x = seed_x;
}
for( var i = min_x - 1;
i > (min_x - (self.view_span - len) - 1);
i = i - interval ) {
self.data.forEach(function(series) {
var date = self.parse_date(i);
var value = self.parse_val(fill_value) || null;
series.unshift([date,value]);
});
}
};
// set min/max values for x & y
// loops through all data, so try not to run except during graph init
self.set_domain = function(type, data) {
console.log("Yo");
var values = [];
// get all y values from all series
data.forEach( function(series) {
series.forEach( function(d) {
values.push( d[1] );
} );
} );
var xMin = 0, xMax = 0, yMin = 0, yMax = 0;
if( data && data[0] && data[0][0] ) {
// get x min/max from the first series only
var first = data[0];
xMin = first[0][0];
xMax = first[ first.length - 1 ][0];
// get y min/max from values array built above
yMin = d3.min( values ) - self.y_nice_buffer;
yMax = d3.max( values ) + self.y_nice_buffer;
}
self.domain[type] = {
x: [xMin.getTime(), xMax.getTime()],
// y: [yMin, yMax]
y: [0-1, 100+1]
};
console.log(xMax.getTime());
};
self.update_domain = function(type, point) {
// min x
if( point[0] < self.domain[type].x[0] )
self.domain[type].x[0] = point[0];
// max x
if( point[0] > self.domain[type].x[1] )
self.domain[type].x[1] = point[0];
// min y
if( point[1] < self.domain[type].y[0] )
self.domain[type].y[0] = point[1];
// max y
if( point[1] > self.domain[type].y[1] )
self.domain[type].y[1] = point[1];
};
// draw the top view pane
self.draw_view = function() {
//console.log("Drawing view");
var w = self.width, h = self.height;
var values = self.view_data;
// set up scale and axis functions
var diff = self.get_diff(w, values);
var x = d3.time.scale()
.range([0, w])
.domain(self.domain.view.x);
var y = d3.scale.linear()
.range([h, 0])
.domain(self.domain.view.y).nice();
console.log(self.domain.view.x.length);
xAxis = d3.svg.axis()
.scale(x)
.tickSize(-1 * h)
.ticks(10)
.orient("bottom");
//.tickSubdivide(false);
yAxis = d3.svg.axis()
.scale(y)
.ticks(5)
.tickSize(10)
.orient(self.orient_y);
// A line generator, for the dark stroke.
var line = d3.svg.line()
.x( function(d) { return x(d[0]) })
.y( function(d) { return y(d[1]) })
.interpolate(self.interpolation).tension(self.tension);
var view = d3.select(this.selector + " .view");
//view.remove();
view.html(""); // clear everything out of container
// Add an SVG element with the desired dimensions and margin.
var svg = view.append("svg:svg")
.attr("width", w)
.attr("height", h);
// draw scroller group, with x axis and data line(s)
// remove old
svg.selectAll(".scroller").remove();
var scroller = svg.append("svg:g")
.attr("class", "scroller");
// Add the line paths (one per series)
// the selectAll should return only the series line <path> elements
// i.e. the same number of lines as there are data arrays in self.data
var paths = scroller.selectAll("path.line")
.data(values)
.enter().append("svg:path")
.attr("d", line)
.attr("class", "line")
.attr("clip-path", "url(#clip)");
var i=0;
self.series.forEach( function(series) {
series.path = paths[0][i++];
var clazz = series.path.getAttribute("class");
if( series.css ) {
series.path.setAttribute("class", clazz + " " + series.css);
}
});
// Add the x-axis.
scroller.append("svg:g")
.attr("class", "x axis")
.attr("transform", "translate(0," + (h - 15) + ")")
.call(xAxis);
// Add the y-axis.
svg.append("svg:g")
.attr("class", "y axis")
.call(yAxis);
};
self.draw_slider = function(svg) {
var sizer_w = self.sizer_width,
sizer_halfw = Math.floor(sizer_w/2),
sizer_h = Math.round(self.summary_height / 3);
// slider_container
var slider_container = svg.append("svg:g")
.append("svg:g")
.attr("class", "slider_container")
.attr("transform",
"translate(" + (self.slider.x + sizer_halfw + 1) + ")");
// slider
var slider = svg.append("svg:g")
.attr("class", "slider")
.attr("transform",
"translate(" + (self.slider.x + sizer_halfw + 1) + ")");
// left border and sizer
var left = slider_container.append("svg:g")
.attr("class", "left");
left.append("svg:line")
.attr("y1", 1)
.attr("y2", self.summary_height)
.attr("x1", 0)
.attr("x2", 0)
.attr("class", "border");
left.append("svg:rect")
.attr("class", "sizer")
.attr("x", -1 * sizer_halfw)
.attr("y", Math.round(self.summary_height/2)-Math.round(sizer_h/2))
.attr("width", sizer_w)
.attr("height", sizer_h)
.attr("rx", 2)
.attr("ry", 2)
// right border and sizer
var right = slider_container.append("svg:g")
.attr("class", "right");
right.append("svg:line") // summary right border
.attr("y1", 1)
.attr("y2", self.summary_height)
.attr("x1", self.slider.w - sizer_w - 2)
.attr("x2", self.slider.w - sizer_w - 2)
.attr("class", "border");
right.append("svg:rect")
.attr("class", "sizer")
.attr("x", self.slider.w - sizer_w - sizer_halfw - 2)
.attr("y", Math.round(self.summary_height/2)-Math.round(sizer_h/2))
.attr("width", sizer_w)
.attr("height", sizer_h)
.attr("rx", 2)
.attr("ry", 2)
// slider top 'clear' border
slider_container.append("svg:line")
.attr("class", "slider-top-border")
.attr("y1", 1)
.attr("y2", 1)
.attr("x1", 1)
.attr("x2", self.slider.w - sizer_w - 2);
// bottom handle
var handle = slider.append("svg:rect")
.attr("class", "handle bottom")
.attr("x", 0)
.attr("y", self.summary_height + 1)
.attr("width", self.slider.w - sizer_w - 2)
.attr("height", self.handle_height);
// raised ridges
var rt = Math.round(self.handle_height / 2) - 3 +
self.summary_height;
var rl = Math.round(self.slider.w / 2) - 4;
for( var i=0; i < 4; i++ ) {
slider.append("svg:line")
.attr("class", "handle-ridges odd")
.attr("y1", rt)
.attr("y2", rt + 5)
.attr("x1", rl + (i*2))
.attr("x2", rl + (i*2));
slider.append("svg:line")
.attr("class", "handle-ridges even")
.attr("y1", rt + 1)
.attr("y2", rt + 6)
.attr("x1", rl + (i*2) + 1)
.attr("x2", rl + (i*2) + 1);
}
// dragging
slider.call(d3.behavior.drag()
.on("dragstart", function(d) {
this.__origin__ = self.slider.x;
this.__offset__ = 0;
})
.on("drag", function(d) {
this.__offset__ += d3.event.dx;
self.move_slider(this.__origin__, this.__offset__);
})
.on("dragend", function() {
delete this.__origin__;
delete this.__offset__;
}));
// dragging on left/right sizers
var sizer_spec = d3.behavior.drag()
.on("dragstart", function(d) {
var clazz = this.className.baseVal;
this.__origin__ = self[clazz].x;
this.__offset__ = 0;
})
.on("drag", function(d) {
this.__offset__ += d3.event.dx;
self.move_sizer(this);
})
.on("dragend", function() {
delete this.__origin__;
delete this.__offset__;
self.sizer_end(this);
});
left.call(sizer_spec);
right.call(sizer_spec);
};
self.move_slider = function(origin, dx) {
var sizer_w = self.sizer_width;
var sizer_halfw = Math.floor(sizer_w/2) + 1;
self.slider.x = origin + dx;
if( self.slider.x < sizer_halfw ) self.slider.x = sizer_halfw;
if( self.slider.x > self.slider.max_x + sizer_halfw )
self.slider.x = self.slider.max_x + sizer_halfw;
d3.select(this.selector + " .slider_container")
.attr("transform", "translate(" + self.slider.x + ")")
var slider_new_x = self.slider.x;
d3.select(this.selector + " .slider")
.attr("transform", "translate(" + slider_new_x + ")")
self.redraw_view();
};
self.move_sizer = function(sizer) {
var clazz = sizer.className.baseVal;
self[clazz].x = sizer.__origin__ + sizer.__offset__;
var sizer_new_x = self[clazz].x;
d3.select(this.selector + " ." + clazz)
.attr("transform", "translate(" + sizer_new_x + ")")
};
self.sizer_end = function(sizer) {
var clazz = sizer.className.baseVal;
var diffpx = self[clazz].x;
// px to data points
var diff = Math.round(diffpx * (self.data.length / self.width));
//console.log(self.data.length, self.width, diffpx, diff);
if( clazz == "left" ) {
self.slider.x += diffpx;
self.view_span -= diff;
} else {
self.view_span += diff;
}
// reset sizer x
self[clazz].x = 0;
self.redraw_view();
};
self.redraw_view = function() {
var max_elem = self.data.length - self.view_span;
var start = Math.round(self.slider.x * (max_elem / self.slider.max_x));
self.draw_view( self.data.slice(start, start + self.view_span) );
};
// call constructor (after all functions have been loaded)
self.init();
};