/*global define */
define(['jquery', 'underscore', 'backbone', 'd3'],
function($, _, Backbone, d3) {
'use strict';
/**
* @class MetricsChartView
* @classdesc The MetricsChartView will render an SVG times-series chart using D3 that shows the number of metrics over time.
* @screenshot views/MetricsChartView.png
* @classcategory Views
*/
var MetricsChartView = Backbone.View.extend(
/** @lends MetricsChartView.prototype */{
initialize: function (options) {
if(!d3){ console.log('SVG is not supported'); return null; }
if(typeof options !== "undefined"){
this.model = options.model || null; // TODO: figure out how to set the model on this view
this.metricCount = options.metricCount || "0"; // for now, use individual arrays
this.metricMonths = options.metricMonths || "0";
this.id = options.id || "metrics-chart";
this.viewType = options.type || "dataset";
this.width = options.width || 600;
this.height = options.height || 370;
this.metricName = options.metricName;
}
},
// http://stackoverflow.com/questions/9651167/svg-not-rendering-properly-as-a-backbone-view
// Give our el a svg namespace because Backbone gives a different one automatically
nameSpace: "http://www.w3.org/2000/svg",
_ensureElement: function() {
if (!this.el) {
var attrs = _.extend({}, _.result(this, 'attributes'));
if (this.id) attrs.id = _.result(this, 'id');
if (this.className) attrs['class'] = _.result(this, 'className');
var $el = $(window.document.createElementNS(_.result(this, 'nameSpace'), _.result(this, 'tagName'))).attr(attrs);
this.setElement($el, false);
} else {
this.setElement(_.result(this, 'el'), false);
}
},
tagName: "svg",
/** Renders this Metric Chart view. */
render: function(){
//Clear out any view elements in case this is a re-render
this.$el.empty();
/*
* ========================================================================
* NAMING CONVENTIONS:
CONTEXT: Context refers to the mini slider chart at the bottom, that includes the d3 "brush"
FOCUS: Focus refers to the larger main chart at the top
BRUSH: The rectangle in the context chart that highlights what is currently in focus in the focus chart.
* ========================================================================
*/
// check if there have been any views/citations
var sumMetricCount = 0;
for (var i = 0; i < this.metricCount.length; i++) {
sumMetricCount += this.metricCount[i]
}
var self = this;
// when ther no data or no views/citations yet, just show some text:
if(this.metricCount.length == 0 || this.metricCount == 0 || sumMetricCount ==0){
var metricNameLemma = this.metricName.toLowerCase().substring(0, this.metricName.length - 1);
var textMessage = "This dataset hasn’t been " + metricNameLemma + "ed yet."
if (this.viewType != "dataset") {
textMessage = "These datasets have not been " + metricNameLemma + "ed yet."
}
var margin = {top: 25, right: 40, bottom: 40, left: 40},
height = this.height - margin.top - margin.bottom;
//Set the chart width
this.$el.css("width", "100%");
var width = (this.$el.width() || this.width) - margin.left - margin.right;
this.width = width;
var vis = d3.select(this.el)
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.attr("class", "line-chart no-data");
var bkg = vis.append("svg:rect")
.attr("class", "no-data")
.attr("width", width)
.attr("height", height)
.attr("rx", 2)
.attr("ry", 2)
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var msg = vis.append("text")
.attr("class", "no-data")
.text(textMessage)
.attr("text-anchor", "middle")
.attr("font-size", "20px")
.attr("x", width/2)
.attr("y", height/2)
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
// if there is data (even a series of zeros), draw the time-series chart:
} else {
/*
* ========================================================================
* Global variables and options
* ========================================================================
*/
var metricName = this.metricName;
// the format of the date in the input data
var input_date_format = d3.time.format("%Y-%m");
// how dates will be displayed in the chart in most cases
var display_date_format = d3.time.format("%b %Y");
// the length of a day/year in milliseconds
var day_in_ms = 86400000,
year_in_ms = 31540000000;
// focus chart sizing
var margin = {top: 30, right: 30, bottom: 95, left: 20},
height = this.height - margin.top - margin.bottom;
//Set the chart width
this.$el.css("width", "100%");
var width = (this.$el.width() || this.width) - margin.left - margin.right;
this.width = width;
// context chart sizing
var margin_context = {top: 315, right: 30, bottom: 20, left: 20},
height_context = this.height - margin_context.top - margin_context.bottom;
// zoom button sizing
var button_width = 40,
button_height = 14,
button_padding = 10;
// how wide does the tooltip div need to be to accomdate text?
var tooltip_width = 76;
// what proportion of a month should a bar cover?
var bar_width_factor = 0.8;
/*
* ========================================================================
* Prepare data
* ========================================================================
*/
// change dates to milliseconds, to enable calculating the `d3.extent`
var metricMonths_parsed = [];
this.metricMonths.forEach(function(part, index, theArray) {
try {
metricMonths_parsed[index] = input_date_format.parse(part).getTime();
}
catch {
// replace null with current month
var today = new Date();
var yyyy = today.getFullYear();
var mm = today.getMonth() + 1;
var updatedPart = yyyy.toString() + "-" + (mm.toString()).padStart(2, '0');
metricMonths_parsed[index] = input_date_format.parse(updatedPart).getTime();
}
});
// input data from model doesn't list months where there were 0 counts for all metrics (views/downloads/citations)
// construct an array of all months between min and max dates to use as x variable
var all_months = d3.time.scale()
.domain(d3.extent(metricMonths_parsed))
.ticks(d3.time.months, 1);
// add padding to both sides of array so that bars don't get cut off.
// add more padding when there's just one bar (otherwise it's too wide)
if (metricMonths_parsed.length == 1) {
var new_min_date = new Date(d3.extent(metricMonths_parsed)[0] - day_in_ms*13),
new_max_date = new Date(d3.extent(metricMonths_parsed)[1] + day_in_ms*31*bar_width_factor + day_in_ms*13);
} else {
var new_min_date = new Date(d3.extent(metricMonths_parsed)[0] - day_in_ms*1),
new_max_date = new Date(d3.extent(metricMonths_parsed)[1] + day_in_ms*31*bar_width_factor);
};
all_months.push(new_min_date);
// also add a little padding on the left for consistency
all_months.push(new_max_date);
// for each month, check whether there is a count available,
// if so append it, otherwise append zero.
var dataset = [];
for(var i=0; i<all_months.length; i++){
var match_index = metricMonths_parsed.indexOf(all_months[i].getTime());
if (match_index == -1) { // no match in data
dataset.push({integer: i, month: all_months[i], count:0});
} else { // match in data
dataset.push({integer: i, month: all_months[i], count:this.metricCount[match_index]});
}
};
/*
* ========================================================================
* x and y coordinates
* ========================================================================
*/
var x_full_extent = d3.extent(dataset, function(d) { return d.month; });
var bar_width = ((day_in_ms*30)/(x_full_extent[1]-x_full_extent[0])) * width * bar_width_factor;
/* === Focus Chart === */
var x = d3.time.scale()
.range([0,width])
.domain(d3.extent(dataset, function(d) { return d.month; }));
var y = d3.scale.linear()
.range([height, 0])
.domain([0, d3.max(dataset, function(d) { return d.count; })*1.04]);
var x_axis = d3.svg.axis()
.scale(x)
.orient("bottom")
.tickSize(-(height))
.ticks(generate_ticks)
.tickFormat(format_months);
var y_axis = d3.svg.axis()
.scale(y)
.ticks(4)
.tickFormat(d3.format("d"))
.tickSize(-(width))
.orient("right");
/* === Context Chart === */
var x_context = d3.time.scale()
.range([0, width])
.domain(d3.extent(dataset, function(d) { return d.month; }));
var y_context = d3.scale.linear()
.range([height_context, 0])
.domain(y.domain());
var x_axis_context = d3.svg.axis()
.scale(x_context)
.orient("bottom")
.ticks(generate_ticks)
.tickFormat(format_months);
/*
* ========================================================================
* Variables for brushing and zooming behaviour
* ========================================================================
*/
var brush = d3.svg.brush()
.x(x_context)
.on("brush", change_focus_brush)
.on("brushend", check_bounds);
var zoom = d3.behavior.zoom()
.on("zoom", change_focus_zoom)
.on("zoomend", check_bounds);
/*
* ========================================================================
* Define the SVG area ("vis") and append all the layers
* ========================================================================
*/
// === the main components === //
var vis = d3.select(this.el)
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.attr("class", "line-chart");
// clipPath is used to keep elements from moving outside of plot area when viwer zooms/scrolls/brushes
vis.append("defs").append("clipPath")
.attr("id", "clip")
.append("rect")
.attr("width", width)
.attr("height", height);
var pane = vis.append("rect")
.attr("class", "pane")
.attr("width", width)
.attr("height", height)
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var context = vis.append("g")
.attr("class", "context")
.attr("transform", "translate(" + margin_context.left + "," + margin_context.top + ")");
var focus = vis.append("g")
.attr("class", "focus")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
// === current date range text & zoom buttons === //
var expl_text = vis.append("g")
.attr("id", "buttons_group")
.attr("transform", "translate(" + 0 + ","+ 0 +")");
expl_text.append("text")
.attr("id", "totalCount")
.style("text-anchor", "start")
.attr("transform", "translate(" + 18 + ","+ 11 +")");
expl_text.append("text")
.attr("id", "displayDates")
.style("text-anchor", "start")
.attr("transform", "translate(" + 20 + ","+ 22 +")");
update_context();
// === the zooming/scaling buttons === //
if ((x_full_extent[1] - x_full_extent[0]) < year_in_ms) {
var button_data =["month","all"];
} else {
var button_data =["year","month","all"];
};
var button_count = button_data.length -1,
button_g_width = (button_count*button_width) +
(button_count*button_padding) +
margin.right - button_padding;
expl_text.append("text")
.attr("class", "zoomto_text")
.text("Zoom to")
.style("text-anchor", "start")
.attr("transform", "translate(" + (width - button_g_width - 45) + ","+ 14 +")")
.style("opacity", "0");
var button = expl_text.selectAll("g")
.data(button_data)
.enter().append("g")
.attr("class", "scale_button")
.attr("transform", function(d, i) { return "translate(" + ((width - button_g_width) + i*button_width + i*button_padding) + ",4)"; })
.style("opacity", "0");
button.append("rect")
.attr("class", "button_rect")
.attr("width", button_width)
.attr("height", button_height)
.attr("rx", 1)
.attr("ry", 1);
button.append("text")
.attr("dy", (button_height/2 + 3))
.attr("dx", button_width/2)
.style("text-anchor", "middle")
.text(function(d) { return d; });
/* === focus chart === */
focus.append("g")
.attr("class", "y axis")
.call(y_axis)
.attr("transform", "translate(" + (width) + ", 0)")
.style("text-anchor", "middle");
// x-axis
focus.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(x_axis)
.style("text-anchor", "middle");
// enter bars
focus.selectAll(".bar")
.data(dataset)
.enter().append("rect")
.attr("class", "bar")
.attr("id", function(d){return "bar_" + d.month.getTime()}) //id of each bar is "bar_" plus it's associated date in ms
.attr("x", function (d) {return x(d.month); })
.attr("y", height)
.attr("height", 0)
.attr("width", bar_width)
.style("opacity", 0)
.on("mouseover", function(d) {
var floor_month = d3.time.month.floor(d.month).getTime();
highlight_bar("#bar_" + floor_month);
highlight_label("#label_" + floor_month);
show_tooltip(d);
})
.on("mouseout", function(d) {
var floor_month = d3.time.month.floor(d.month).getTime();
unhighlight_bar("#bar_" + floor_month);
unhighlight_label("#label_" + floor_month);
hide_tooltip(d);
});
// animate bars
focus.selectAll(".bar")
.transition()
.duration(450)
.ease("elastic", 1.03, 0.98)
.delay(function(d, i) {
var max_delay = 600;
var z = i / (dataset.length-1);
var line_z = z * max_delay * 0.4;
var log_z = Math.log2(z + 1) * max_delay * 0.6;
return(250+line_z + log_z);
})
.attr("y", function (d) {return y(d.count); })
.attr("height", function (d) {return y(0) - y(d.count); })
.style("opacity", 1);
/* === context chart === */
// enter context bars
context.selectAll(".bar_context")
.data(dataset)
.enter().append("rect")
.attr("class", "bar_context")
.attr("x", function (d) {return x_context(d.month) })
.attr("y", height_context)
.attr("height", 0)
.attr("width", bar_width)
.style("opacity", 0);
// animate context bars
context.selectAll(".bar_context")
.transition()
.duration(450)
.ease("elastic", 1.03, 0.98)
.delay(function(d, i) {
var max_delay = 600;
var z = i / (dataset.length-1);
var line_z = z * max_delay * 0.4;
var log_z = Math.log2(z + 1) * max_delay * 0.6;
return(line_z + log_z);
})
.attr("y", function (d) {return y_context(d.count); })
.attr("height", function (d) {return y_context(0) - y_context(d.count); })
.style("opacity", 1);
// x-axis
context.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height_context + ")")
.call(x_axis_context);
/* === brush === */
var brushg = context.append("g")
.attr("class", "x brush")
.call(brush);
brushg.selectAll(".extent")
.attr("y", -6)
.attr("height", height_context + 8)
.style("opacity" , "0");
brushg.selectAll(".resize")
.append("rect")
.attr("class", "handle")
.attr("transform", "translate(0," + -3 + ")")
.attr('rx', 1)
.attr('ry', 1)
.attr("height", 0)
.attr("width", 3)
.style("opacity" , "0");
brushg.selectAll(".resize")
.append("rect")
.attr("class", "handle-mini")
.attr("transform", "translate(-2,8.5)")
.attr('rx', 2)
.attr('ry', 2)
.attr("height", 0)
.attr("width", 7)
.style("opacity" , "0");
/* === y axis title === */
vis.append("text")
.attr("class", "y axis title")
.text("Monthly " + this.metricName)
.attr("x", (-((height+margin.top+margin.bottom-50)/2)))
.attr("y", 0)
.attr("dy", "1em")
.attr("transform", "rotate(-90)")
.style("text-anchor", "middle");
// allow zoom, brush, and scale behavior after a small delay,
// so that user does not interrupt bar entrance animation.
// show UI elements only once user is able to interact with them.
setTimeout(function(){
// disable the zoom behavior on wheel zoom event
// add behaviours
pane.call(zoom)
.call(change_focus_zoom)
.on("wheel.zoom", null);
zoom.x(x);
vis.selectAll(".scale_button")
.style("cursor", "pointer")
.on("click", zoom_to_interval);
// fade in buttons
vis.selectAll(".scale_button,.zoomto_text")
.transition()
.duration(100)
.ease("cubic")
.style("opacity","1");
// fade in brush elements
brushg.selectAll(".extent")
.transition()
.duration(100)
.ease("cubic")
.style("opacity" , "1");
brushg.selectAll(".handle-mini")
.transition()
.duration(170)
.ease("linear")
.attr("height", (height_context/2))
.style("opacity" , "1");
brushg.selectAll(".handle")
.transition()
.duration(170)
.ease("linear")
.attr("height", height_context + 6)
.style("opacity" , "1");
if (self.viewType === "dataset") {
d3.select(".metric-chart")
.append("div")
.attr("class", "metric_tooltip")
.style("opacity", 0)
.style("width", tooltip_width + "px");
}
else {
d3.select("#user-" + self.id)
.append("div")
.attr("class", "metric_tooltip")
.style("opacity", 0)
.style("width", tooltip_width + "px");
}
},
900);
/*
* ========================================================================
* Functions
* ========================================================================
*/
/* ------------------------------------------------------
HELPER FUNCTIONS
------------------------------------------------------ */
function get_zoom_scale(){
// custom zoom scale needed to calculate width of bars with zoom/brush.
// can't use zoom.scale() because this needs to be reset (to one) when using change_focus_brush()
var x_current_width = x.domain()[1] - x.domain()[0],
x_total_width = x_full_extent[1] - x_full_extent[0],
zoom_scale = x_total_width/x_current_width;
return(zoom_scale);
};
function convert_metric_name(n){
// remove s from metric name if count is 1
if (n == 1) {
return metricName.slice(0, -1);
} else {
return metricName;
}
};
/* ------------------------------------------------------
HOVER BEHAVIOUR: X-AXIS LABELS, BARS, TOOLTIPS
------------------------------------------------------ */
function highlight_bar(bar_id){
// mouseover effect on bar
focus.select(bar_id)
.style("stroke-width", "1")
.style("opacity", "0.9");
};
function unhighlight_bar(bar_id) {
// undo mouseover effect on bar
focus.select(bar_id)
.style("stroke-width", "0")
.style("opacity", "1");
};
function highlight_label(label_id){
// mouseover effect on label
focus.select(label_id).selectAll("text")
.style("font-weight", "bold");
};
function unhighlight_label(label_id){
// undo mouseover effect on label
focus.select(label_id).selectAll("text")
.style("font-weight", "normal");
};
function add_tick_behaviour() {
// adds html ID and hover behaviour to the x-axis ticks/labels
// this function is called each time these labels/ticks are re-generated.
focus.selectAll(".x.axis .tick")[0].forEach(function(tick) {
d3.select(tick)
.attr("id", function(d,i) {
return "label_" + d3.time.month.floor(d).getTime();
})
.on("mouseover", function(tick) {
// extract the datapoint from dataset that is associated with x-axis label
var floor_month = d3.time.month.floor(tick).getTime();
var d = dataset.filter( function(d) { return d.month.getTime() === floor_month; })[0];
highlight_bar("#bar_" + floor_month);
highlight_label("#label_" + floor_month);
show_tooltip(d);
})
.on("mouseout", function(tick) {
var floor_month = d3.time.month.floor(tick).getTime();
unhighlight_bar("#bar_" + floor_month);
unhighlight_label("#label_" + floor_month);
hide_tooltip(tick);
});
});
};
function show_tooltip(d) {
if (self.viewType === "dataset") {
var bar_width_px = bar_width * get_zoom_scale();
// get the width of the modal. Need for tooltip x-position.
var modal_width = d3.select("#metric-modal")
.style('width')
.slice(0, -2);
var modal_width = Math.round(Number(modal_width));
d3.select(".metric_tooltip")
.html("<b>" + display_date_format(d.month) + "</b><br/>" + d.count + " " + convert_metric_name(d.count))
.style("left", (x(d.month) + (modal_width-(width + margin.left + margin.right)) + (bar_width_px/2) - (tooltip_width/2) + "px"))//) + 300 + ((width/dataset.length) * 0.5 * get_zoom_scale())) + "px")
.style("top", (y(d.count) + 19) + "px");
d3.select(".metric_tooltip")
.transition()
.duration(60)
.style("opacity", 0.98);
}
else {
d3.select("#user-" + self.id + " > .metric_tooltip")
.html("<b>" + display_date_format(d.month) + "</b><br/>" + d.count + " " + convert_metric_name(d.count))
.style("left", d3.event.pageX - 150 + "px")
.style("top", y(d.count) - y(0) - 150 + "px");
d3.select("#user-" + self.id + " > .metric_tooltip")
.transition()
.duration(60)
.style("opacity", 0.98);
}
};
function hide_tooltip(d) {
if (self.viewType === "dataset") {
d3.select(".metric_tooltip")
.transition()
.duration(60)
.style("opacity", 0);
}
else {
d3.select("#user-" + self.id + " > .metric_tooltip")
.transition()
.duration(60)
.style("opacity", 0);
}
};
/* ------------------------------------------------------
TICK FORMATTING FUNCTIONS (focus x-axis)
------------------------------------------------------ */
function generate_ticks(t0, t1, dt) {
var label_size_px = 45;
var max_total_labels = Math.floor(width / label_size_px);
// offset so that labels are at the center of each month.
var offset = (day_in_ms*30*bar_width_factor)/2;
function step(date, next_step) {
date.setMonth(date.getMonth() + next_step);
}
var time = d3.time.month.floor(t0),
time = new Date(time.getTime() + offset),
times = [],
monthFactors = [1,3,4,12];
while (time < t1) { times.push(new Date(+time)), step(time, 1)};
var timesCopy = times;
var i;
for(i=0 ; times.length > max_total_labels ; i++){
var times = _.filter(timesCopy, function(d){ return (d.getMonth()) % monthFactors[i] == 0; } )
};
return times;
};
function format_months(d){
add_tick_behaviour(); // add tick hover behaviour everytime ticks are re-formatted;
var test = (x.domain()[1] - x.domain()[0]) > 132167493818; // when to switch from yyyy to mm-yyyy
if(d.getMonth()==0 & test){//if january
var yearOnly = d3.time.format("%Y");
return(yearOnly(d));
} else {
return(display_date_format(d))
}
}
/* ------------------------------------------------------
BRUSH & ZOOM BEHAVIOUR
------------------------------------------------------ */
function change_focus_brush() {
// make the x domain match the brush domain
x.domain(brush.empty() ? x_context.domain() : brush.extent());
// reset zoom
zoom.x(x);
// re-draw axis and elements at new scale
update_focus();
// update the explanatory text (total views, date range)
update_context();
}
function change_focus_zoom() {
// make the brush range change with the x domain in focus
brush.extent(x.domain());
vis.select(".brush").call(brush);
// re-draw axis and elements at new scale
update_focus();
// update the explanatory text (total views, date range)
update_context();
}
function update_focus() {
// calculate where the bar goes out of focus
var bar_width_days = bar_width_factor*30.5;
var left_date = x.domain()[0];
if(left_date.getDate() < bar_width_days){
var left_date = d3.time.month.floor(left_date),
left_date = new Date(left_date.getTime())
};
var data_subset_focus = dataset.filter( function(d) {
return d.month <= x.domain()[1] && d.month >= left_date
});
var y_max_focus = d3.max(data_subset_focus, function(d) { return d.count; }) * 1.04 || 1.04;
var y_change_duration = 85;
// reset y-axis
y.domain([0, y_max_focus]);
focus.select(".y.axis")
.transition()
.duration(y_change_duration*0.95)
.call(y_axis);
// reset bar height given y-axis
focus.selectAll(".bar")
.transition()
.duration(y_change_duration)
.attr("y", function (d) {return y(d.count); })
.attr("height", function (d) {return y(0) - y(d.count); });
// redraw other elements
focus.select(".x.axis").call(x_axis);
focus.selectAll(".bar")
.attr("x", function (d) {return x(d.month); })
.attr("width", bar_width * get_zoom_scale())
.style("opacity", "1"); // incase user scrolls before entrance animation finishes.
};
function update_context() {
// updates display dates, total count, and decreases opacity of context bars out of focus
var b = brush.extent();
// calculate where the bar goes out of focus
var bar_width_days = bar_width_factor*30.5;
if(b[0].getDate() >= bar_width_days){
var left_date = d3.time.month.ceil(b[0]),
left_date = new Date(left_date.getTime())
} else {
left_date = d3.time.month.floor(b[0])
};
// get the range of data in focus
// if there's only one data point, make sure start and end month are the same
if (metricMonths_parsed.length == 1) {
var start_month = display_date_format(new Date(metricMonths_parsed[0])),
end_month = start_month;
} else {
var start_month = (brush.empty()) ? display_date_format(x_full_extent[0]) : display_date_format(left_date),
end_month = (brush.empty()) ? display_date_format(x_full_extent[1]) : display_date_format(b[1]);
};
var data_subset_focus = dataset.filter(function(d) {
if (metricMonths_parsed.length == 1) {
return d.month
}
else {
return d.month <= display_date_format.parse(end_month) && d.month >= left_date
};
});
// calcualte the total views/downloads within focus area
var total_count = 0;
for (var i = 0; i < data_subset_focus.length; i++) {
total_count += data_subset_focus[i].count;
}
// Update start and end dates and total count
vis.select("#displayDates")
.text(start_month == end_month ? "in " + start_month : "from " + start_month + " to " + end_month);
vis.select("#totalCount")
.text(MetacatUI.appView.commaSeparateNumber(total_count) + " " + convert_metric_name(total_count));
// Fade all years in the bar chart not within the brush
context.selectAll(".bar_context")
.style("opacity", function(d, i) {
if (metricMonths_parsed.length == 1) {
return "1";
} else {
return d.month <= display_date_format.parse(end_month) && d.month >= left_date || brush.empty() ? "1" : ".3";
}
});
};
function check_bounds() {
// when brush stops moving:
// check whether chart was scrolled out of bounds and fix,
var b = brush.extent();
var out_of_bounds = brush.extent().some(function(e) { return e < x_full_extent[0] | e > x_full_extent[1]; });
if (out_of_bounds){ b = move_in_bounds(b) };
};
function move_in_bounds(b) {
// move back to boundaries if user pans outside min and max date.
var year_in_ms = 31536000000,
brush_start_new,
brush_end_new;
if (b[0] < x_full_extent[0]) { brush_start_new = x_full_extent[0]; }
else if (b[0] > x_full_extent[1]) { brush_start_new = x_full_extent[0]; }
else { brush_start_new = b[0]; };
if (b[1] > x_full_extent[1]) { brush_end_new = x_full_extent[1]; }
else if (b[1] < x_full_extent[0]) { brush_end_new = x_full_extent[1]; }
else { brush_end_new = b[1]; };
brush.extent([brush_start_new, brush_end_new]);
brush(d3.select("#" + self.id + " > .context > .brush").transition());
change_focus_brush();
change_focus_zoom();
return(brush.extent())
};
function zoom_to_interval(d,i) {
// action for buttons that zoom focus to certain time interval
var b = brush.extent(),
interval_ms,
brush_end_new,
brush_start_new;
if (d == "year") { interval_ms = 31536000000}
else if (d == "month") { interval_ms = 2592000000 };
if ( d == "year" | d == "month" ) {
if((x_full_extent[1].getTime() - b[1].getTime()) < interval_ms){
// if brush is too far to the right that increasing the right-hand brush boundary would make the chart go out of bounds....
brush_start_new = new Date(x_full_extent[1].getTime() - interval_ms); // ...then decrease the left-hand brush boundary...
brush_end_new = x_full_extent[1]; //...and set the right-hand brush boundary to the maxiumum limit.
} else {
// otherwise, increase the right-hand brush boundary.
brush_start_new = b[0];
brush_end_new = new Date(b[0].getTime() + interval_ms);
};
} else if ( d == "all") {
brush_start_new = x_full_extent[0];
brush_end_new = x_full_extent[1]
} else {
brush_start_new = b[0];
brush_end_new = b[1];
};
brush.extent([brush_start_new, brush_end_new]);
// now draw the brush to match our extent
brush(d3.select("#" + self.id + " > .context > .brush").transition());
// now fire the brushstart, brushmove, and check_bounds events
brush.event(d3.select("#" + self.id + " > .context > .brush").transition());
};
// that's it!
}
//Re-render this view when the window is resized
this.listenToWindowResize();
return this;
},
/**
* Adds a listener so when the window is resized, the chart is redrawn
*/
listenToWindowResize: function(){
if( !this.resizeCallback ){
this.resizeCallback = this.render.bind(this);
window.addEventListener('resize', this.resizeCallback, false);
}
},
/**
* Removes the window resize listener set in {@link MetricsChartView#listenToWindowResize}
*/
stopListenToWindowResize: function(){
//Remove the listener to window resize
window.removeEventListener("resize", this.resizeCallback, false);
delete this.resizeCallback;
},
/**
* Cleans up listeners and other artifacts from this view
*/
onClose: function(){
this.stopListenToWindowResize();
}
});
return MetricsChartView;
});