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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style type="text/css"> |
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/* 13. Basic Styling with CSS */ |
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/* Style the lines by removing the fill and applying a stroke */ |
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.line { |
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fill: none; |
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stroke: #ffab00; |
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stroke-width: 3; |
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} |
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/* Style the dots by assigning a fill and stroke */ |
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.dot { |
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fill: #ffab00; |
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stroke: #fff; |
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} |
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</style> |
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<!-- Body tag is where we will append our SVG and SVG objects--> |
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<body> |
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</body> |
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<!-- Load in the d3 library --> |
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<script src="https://d3js.org/d3.v4.min.js"></script> |
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<script> |
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// 2. Use the margin convention practice |
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var margin = {top: 50, right: 50, bottom: 50, left: 50} |
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, width = window.innerWidth - margin.left - margin.right // Use the window's width |
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, height = window.innerHeight - margin.top - margin.bottom; // Use the window's height |
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// The number of datapoints |
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var n = 21; |
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// 5. X scale will use the index of our data |
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var xScale = d3.scaleLinear() |
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.domain([0, n-1]) // input |
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.range([0, width]); // output |
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// 6. Y scale will use the randomly generate number |
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var yScale = d3.scaleLinear() |
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.domain([0, 1]) // input |
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.range([height, 0]); // output |
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// 7. d3's line generator |
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var line = d3.line() |
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.x(function(d, i) { return xScale(i); }) // set the x values for the line generator |
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.y(function(d) { return yScale(d.y); }) // set the y values for the line generator |
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.curve(d3.curveMonotoneX) // apply smoothing to the line |
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// 8. An array of objects of length N. Each object has key -> value pair, the key being "y" and the value is a random number |
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var dataset = d3.range(n).map(function(d) { return {"y": d3.randomUniform(1)() } }) |
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console.log(dataset) |
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// 1. Add the SVG to the page and employ #2 |
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var svg = d3.select("body").append("svg") |
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.attr("width", width + margin.left + margin.right) |
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.attr("height", height + margin.top + margin.bottom) |
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.append("g") |
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.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); |
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// 3. Call the x axis in a group tag |
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svg.append("g") |
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.attr("class", "x axis") |
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.attr("transform", "translate(0," + height + ")") |
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.call(d3.axisBottom(xScale)); // Create an axis component with d3.axisBottom |
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// 4. Call the y axis in a group tag |
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svg.append("g") |
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.attr("class", "y axis") |
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.call(d3.axisLeft(yScale)); // Create an axis component with d3.axisLeft |
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// 9. Append the path, bind the data, and call the line generator |
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svg.append("path") |
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.datum(dataset) // 10. Binds data to the line |
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.attr("class", "line") // Assign a class for styling |
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.attr("d", line); // 11. Calls the line generator |
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// 12. Appends a circle for each datapoint |
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svg.selectAll(".dot") |
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.data(dataset) |
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.enter().append("circle") // Uses the enter().append() method |
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.attr("class", "dot") // Assign a class for styling |
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.attr("cx", function(d, i) { return xScale(i) }) |
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.attr("cy", function(d) { return yScale(d.y) }) |
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.attr("r", 5); |
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</script> |
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