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script.js
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script.js
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var margin = {top: 50, right: 100, bottom: 50, left: 50},
width = 960 - margin.left - margin.right,
height = 600 - margin.top - margin.bottom;
//scales
//"D3's time scale is an extension of d3.scale.linear that uses JavaScript Date objects as the domain representation.
//Thus, unlike the normal linear scale, domain values are coerced to dates rather than numbers;"
//https://github.com/mbostock/d3/wiki/Time-Scales
var x = d3.scaleTime()
.range([0, width]);
var y = d3.scaleLinear()
.range([height, 0]);
var svg = d3.select("body").append("svg")
.attr("class", "chart")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var interval = 200000;
//obtain data to make imports dashed line for undefined data
var findCriticalPairs = function(data) {
// Store property `critical` on points before and after a series of points.
var inUndefinedSeries = false;
var criticalValues = [];
var criticalPairs = [];
_.each(data, function(e, i) {
if (!e.Imports) {
// If this is the first item in an undefined series, add the previous
// item to the critical values array.
if (!inUndefinedSeries) {
inUndefinedSeries = true;
data[i - 1].critical = true;
criticalValues.push(data[i - 1]);
}
} else if (inUndefinedSeries) {
// When we reach the end of an undefined series, add the current item
// to the critical values array.
inUndefinedSeries = false;
data[i].critical = true;
criticalValues.push(data[i]);
}
// Coerce numbers
e.Years = +e.Years;
e.Imports = +e.Imports;
});
// These pairs will be used to generate sections of undefined values
for (var i = 0; i < criticalValues.length; i++) {
if (criticalValues[i].critical && i % 2 === 0) {
criticalPairs.push([criticalValues[i], criticalValues[i + 1]]);
}
}
return criticalPairs;
};
//obtain data to make exports dashed line for undefined data
// var findCriticalPairs2 = function(data) {
// // Store property `critical` on points before and after a series of points.
// var inUndefinedSeries = false;
// var criticalValues = [];
// var criticalPairs = [];
// _.each(data, function(e, i) {
// if (!e.Exports) {
// // If this is the first item in an undefined series, add the previous
// // item to the critical values array.
// if (!inUndefinedSeries) {
// inUndefinedSeries = true;
// data[i - 1].critical = true;
// criticalValues.push(data[i - 1]);
// }
// } else if (inUndefinedSeries) {
// // When we reach the end of an undefined series, add the current item
// // to the critical values array.
// inUndefinedSeries = false;
// data[i].critical = true;
// criticalValues.push(data[i]);
// }
// // Coerce numbers
// e.Years = +e.Years;
// e.Exports = +e.Exports;
// });
// // These pairs will be used to generate sections of undefined values
// for (var i = 0; i < criticalValues.length; i++) {
// if (criticalValues[i].critical && i % 2 === 0) {
// criticalPairs.push([criticalValues[i], criticalValues[i + 1]]);
// }
// }
// return criticalPairs;
// };
d3.csv("playfair_nums_def.csv").then(function(data){
// if (error) throw error;
data.forEach(function(d){
d.Imports= +d.Imports; //ensures data is in number format
d.Exports= +d.Exports;
});
//calculate values to determine y domain
var maxImport = d3.max(data, function(d) {return d.Imports} );
var maxExport = d3.max(data, function(d) {return d.Exports} );
var minImport = d3.min(data, function(d) {return d.Imports} );
var minExport = d3.min(data, function(d) {return d.Exports} );
var firstYr = d3.min(data, function(d) {return d.Years});
var lastYr = d3.max(data, function(d) {return d.Years});
var maxY = Math.max(maxImport, maxExport + 1000000);
//extent is the equivalent of calling min and max simultaneously
x.domain(d3.extent(data, function(d) { return (d.Years);}));
//pick y domain based on smallest and largest number of combined import and export numbers + interval for more space
y.domain([0, maxY+interval]);
//returns y-axis tickmark labels formatted correctly
var tickFormatterY = function(tickVal){
if((tickVal/1000000) === 1){ //if the value is 1, omit s
return ("1 Million");
}else if((tickVal/1000000)%1 === 0){ //if the value is not 1, add an s
return (tickVal/1000000 + " Millions");
}else if (tickVal === 200000){ //first number on y-axis...might need to change to adapt for other data
return tickVal.toLocaleString(); //adds the comma back into the number, for some reason comes in with comma but returns without
}else if(tickVal < 1000000){ //less than 1 million but not the first y-value
return tickVal/100000;
}else{ //return the decimal numbers
return (tickVal/1000000);
}
};
//adjusts y-values to be in intervals of 200,000
var yValues = function(){
var yNums = [];
for(var i=interval; i<=maxY; i+=interval){
yNums.push(i);
}
return yNums;
};
//TODO?
var tickFormatterX = function(tickVal){
// var format = d3.time.format("%y");
// format.parse(tickVal);
// format(new Date(tickVal));
// d3.time.format("d");
// var tempYr = firstYr;
// var xNums[];
// for(var i=tempYr; i <=lastYr; i+=1){
// xNums.push[i];
// }
// return xNums;
// var xNums = [];
// for(var i=firstYr; i<= lastYr; i+=1){
// xNums.push(tickVal.toString().substring(2,2));
// }
// return xNums;
}
//x-axis
var xAxis = d3.axisBottom(x)
.tickSizeInner(-height) //background grid, vertical lines
.tickSizeOuter([0])
// .tickFormat(tickFormatterX)
.tickFormat(d3.format("d")); //removes comma from year
//y-axis
var yAxis = d3.axisRight(y)
.tickValues(yValues()) //override default values created by d3
.tickSizeInner(-width) //background grid, horizontal lines
.tickSizeOuter([0])
.tickFormat(tickFormatterY); //calls custom format function
//line & line2 are area svg for the difference graph (ow would be line svg)
/****LINE AND AREA FOR DEFINED DATA****/
//imports line - yellow
//TODO: curve format -> not basis
var line = d3.area()
.curve(d3.curveCardinal) //makes the line curvy
.defined(function(d) { return d.Imports; }) //limits this line to defined data
.x(d => x(d.Years))
.y(d =>y(d.Imports));
//exports line - pink
var line2 = d3.area()
.curve(d3.curveCardinal)//makes the line curvy
.defined(function(d) { return d.Exports; }) //limits this line to defined data
.x(d => x(d.Years))
.y(d =>y(d.Exports));
var area = d3.area()
.curve(d3.curveCardinal) //makes the line curvy
.defined(function(d) { return d.Imports; }) //limits this area to defined area
.x(function(d) { return x(d.Years)})
.y1(function(d) { return y(d.Imports)}); //y1 makes the Imports line the baseline
/****//**END LINE AND AREA FOR DEFINED DATA****/
/****LINE AND AREA FOR UNDEFINED DATA****/
//imports line - dashed yellow
var lineUndefined = d3.line()
.curve(d3.curveCardinal) //makes the line curvy
.defined(function(d) { console.log(d.critical); return d.critical; }) //returns the data to make the undefined, dashed line
.x(d => x(d.Years))
.y(d =>y(d.Imports));
//exports line - dashed pink
var lineUndefined2 = d3.line()
.curve(d3.curveCardinal) //makes the line curvy
.defined(d => d.critical)
.x(d => x(d.Years))
.y(d => y(d.Exports));
var areaUndefined = d3.area()
.curve(d3.curveCardinal) //makes the line curvy
.defined(d => d.critical) //returns the critical data to limit to undefined area
.x(d => x(d.Years)) //years are only the critical years
.y1(d => y(d.Imports)); //y1 makes the Imports line the baseline, these imports are only the critical point imports
/*************************append all of the graphics to the canvas**************************************/
svg.datum(data); //binds data, makes static and not interactive
//bg color borrowed from former student
//makes inner graph lighter
svg.append("rect")
.attr("height", height)
.attr("width", width)
.attr("fill","white")
.attr("opacity", .2);
/**DIFFERENCE GRAPH - defined data**/
//clip path area above imports line
svg.append("clipPath")
.attr("id", "clip-above")
.append("path")
.attr("d", area.y0(0));
// area below the imports line
svg.append("clipPath")
.attr("id", "clip-below")
.append("path")
.attr("d", area.y0(height));
svg.append("path")
.attr("class", "area above")
.attr("clip-path", "url(#clip-above)")
.attr("d", area.y0(d => y(d.Exports)));
svg.append("path")
.attr("class", "area below")
.attr("clip-path", "url(#clip-below)")
.attr("d", area.y0(d => y(d.Exports)));
/**END DIFFERENCE GRAPH**/
//imports
var criticalPairs = findCriticalPairs(data);
_.each(criticalPairs, function(e) {
//clip path area above imports line
svg.append("clipPath")
.attr("id", "clip-above")
.append("path")
.attr("d", areaUndefined.y0(0));
//area below the imports line
svg.append("clipPath")
.attr("id", "clip-below")
.append("path")
.attr("d", areaUndefined.y0(height));
//shape that represents area between the two lines ... fills where the two intersect
svg.append("path")
.attr("class", "area above")
// .classed("area above", true)
.attr("clip-path", "url(#clip-above)")
.attr("d", areaUndefined.y0(d => y(d.Exports)));
// .attr("d", areaUndefined(e));
//same for the area below
svg.append("path")
.attr("class", "area below")
// .classed("area below", true)
.attr("clip-path", "url(#clip-below)")
.attr("d", areaUndefined.y0( d => y(d.Exports)));
// .attr("d", areaUndefined(e));
//actually fills in the difference chart
svg.append("path")
.attr("class", "area area-undefined")
.attr("d", areaUndefined(e)); //area(e) does the same thing
//dash undefined line for imports
svg.append("path")
.attr("class", "line line-undefined")
.attr("d", lineUndefined(e)); //line(e) does NOT do the same thing
//dash undefined line for exports
svg.append("path")
.attr("class", "exports line-undefined")
.attr("d", lineUndefined2(e));
});
console.log(criticalPairs);
//line imports
svg.append("path")
.attr("class", "line")
.attr("d", line);
//line exports
svg.append("path")
.attr("class", "line exports")
.attr("d", line2);
//x axis
svg.append("g")
.attr("transform", "translate(0," + height + ")") //orients x-axis to bottom of chart (default is top)
.attr("class", "axis")
.call(xAxis);
// "time" label
svg.append("text")
.attr("transform", "translate(" + (width/2) + ")")
.attr("y", -10) //place label with correct space adjacent to graph
.attr("class", "axis-labels")
.style("text-anchor", "middle")
.text("Time");
//y axis
svg.append("g")
.attr("transform", "translate(" + width + ",0)") //orients y-axis to right of chart (default is left)
.attr("class", "axis")
.call(yAxis);
//styles the grid lines based on y-axis values - integer million lines are bolded
svg.selectAll('g.tick line')
.style("stroke-width", function(d){
if ((d/1000000)%1 === 0 ){
return 2;
}else{
return 1;
}
})
.style("opacity", function(d){
if ((d/1000000)%1 === 0 )
return 0.4;
else
return 0.2;
});
//"money" label
svg.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 0 - margin.left/2) //place it with correct space adjacent to graph
.attr("x", 0 - (height/2))
.attr("dy", "1em")
.attr("class", "axis-labels")
.style("text-anchor", "middle")
.text("Money");
//outline around inner chart
svg.append("rect")
.attr("height", height)
.attr("width", width + margin.right)
.attr("fill", "transparent")
.attr("stroke", "black")
.attr("stroke-width", 2);
//)******************************************CREATE GRAPH LABEL - borrowed from former student*******//
var ellipseX=((width*3)/10);
var ellipseY=150;
var textX=((width*2)/15);
var textY=110;
//add Label
svg.append("ellipse")
.attr("id", "currValue")
.attr("cx", ellipseX)
.attr("cy", ellipseY)
.attr("rx",150)
.attr("ry",105)
.attr("fill", "#FCE2B0")
.attr("stroke", "black")
.attr("stroke-width", 1);
svg.append("ellipse")
.attr("id", "currValue")
.attr("cx", ellipseX)
.attr("cy", ellipseY)
.attr("rx", 150)
.attr("ry",105)
.attr("fill","#FF4F4F")
.attr("opacity", .1)
.attr("stroke-width", 0);
svg.append("text")
.attr("id", "currValue")
.attr("class", "titleText")
.attr("x", textX+10)
.attr("y", textY)
.text("EXPORTS & IMPORTS");
svg.append("text")
.attr("id", "currValue")
.attr("class", "titleText2")
.attr("x", textX+60)
.attr("y", textY+40) //adjusts vertical space between text liens
.text("to and from all");
svg.append("g")
.attr("id", "currValue")
.attr("class", "titleText3")
.attr("transform", "translate(55,0)")
.append("text")
.attr("x", (textX-60))
.attr("y", (textY+80))
.text("NORTH AMERICA");
// add line labels
svg.append("text")
.attr("transform", "translate(" + (width-320) + "," + (height-250) + ") rotate(" + (-75) + ")")
.attr("dy", ".35em")
.attr("text-anchor","start")
.style("fill", "black")
.text("Line of Exports");
svg.append("text")
.attr("transform", "translate(" + (width-690) + "," + (height-55) + ") rotate(" + (-11) + ")")
.attr("dy", ".35em")
.attr("text-anchor","start")
.style("fill", "black")
.text("Line of Imports");
});