Working with gradients
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September 8, 2016 14:10
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| <!DOCTYPE html> | |
| <!-- Paul Buffa 2015 | |
| --> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font: 12px sans-serif; | |
| margin: 10; | |
| } | |
| .lines { | |
| stroke: url(#gradient); | |
| stroke-opacity: .5; | |
| stroke-width: .8; | |
| } | |
| .dots { | |
| fill: url(#gradient); | |
| } | |
| rect { | |
| fill-opacity: 0.05; | |
| stroke: #000; | |
| stroke-width: .1; | |
| } | |
| #slider { | |
| width: 350px; | |
| } | |
| </style> | |
| <body> | |
| Choose # of Points | |
| <input id="slider" type="range" min="1" max="100" value="5" step="1" /> | |
| <span id="slider-value">5</span> | |
| <br /> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var margin = {top: 20, right: 20, bottom: 20, left: 20}, | |
| width = 480 - margin.left - margin.right, | |
| height = 480 - margin.top - margin.bottom; | |
| function makeDataset(datalist, num) { | |
| for (var i = 1; i < (num+1); i++) { | |
| datalist.push(i); | |
| } | |
| } | |
| function makeCoordinates(datalist, num) { | |
| for (var i = 1; i < (num+1); i++) { | |
| for (var j = num; j > 0; j--) { | |
| set = [i,j] | |
| datalist.push(set); | |
| } | |
| } | |
| } | |
| var dataset = [], | |
| coordinates = [], | |
| points = 5; | |
| makeDataset(dataset, points); | |
| makeCoordinates(coordinates, points) | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| svg.append("rect") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.append("linearGradient") | |
| .attr("id", "gradient") | |
| .attr("gradientUnits", "userSpaceOnUse") | |
| .attr("x1", 0).attr("y1", 0) | |
| .attr("x2", 480).attr("y2", 480) | |
| .selectAll("stop") | |
| .data([ | |
| {offset: "0%", color: "steelblue"}, | |
| {offset: "50%", color: "black"}, | |
| {offset: "100%", color: "red"} | |
| ]) | |
| .enter().append("stop") | |
| .attr("offset", function(d) { return d.offset; }) | |
| .attr("stop-color", function(d) { return d.color; }); | |
| // // North Horizontal Dots | |
| svg.selectAll("dots") | |
| .data(dataset) | |
| .enter().append("circle") | |
| .attr("class","dots") | |
| .attr("cx",function(d,i) { return (i+1) * (width/points); }) | |
| .attr("cy",0) | |
| .attr("r",2); | |
| // South Horizontal Dots | |
| svg.selectAll("dots") | |
| .data(dataset) | |
| .enter().append("circle") | |
| .attr("class","dots") | |
| .attr("cx",function(d,i) { return i * (width/points); }) | |
| .attr("cy",height) | |
| .attr("r",2); | |
| // // West Vertical Dots | |
| svg.selectAll("dots") | |
| .data(dataset) | |
| .enter().append("circle") | |
| .attr("class","dots") | |
| .attr("cy",function(d,i) { return (i+1) * (height/points); }) | |
| .attr("cx",0) | |
| .attr("r",2); | |
| // East Vertical Dots | |
| svg.selectAll("dots") | |
| .data(dataset) | |
| .enter().append("circle") | |
| .attr("class","dots") | |
| .attr("cy",function(d,i) { return i * (height/points); }) | |
| .attr("cx",width) | |
| .attr("r",2); | |
| // Northwest lines | |
| svg.selectAll("lines") | |
| .data(coordinates) | |
| .enter().append("line") | |
| .attr("class","lines") | |
| .attr("x1", function(d,i) { return d[0] * (width/points); }) | |
| .attr("x2", 0) | |
| .attr("y1", 0) | |
| .attr("y2", function(d,i) { return d[1] * (height/points); }); | |
| // Southeast lines | |
| svg.selectAll("lines") | |
| .data(coordinates) | |
| .enter().append("line") | |
| .attr("class","lines") | |
| .attr("x2", function(d,i) { return (d[0] * (width/points)) - (width/points); }) | |
| .attr("x1", width) | |
| .attr("y2", height) | |
| .attr("y1", function(d,i) { return (d[1] * (height/points)) - (height/points); }); | |
| d3.select("#slider").on("input", change) | |
| // Redraw | |
| function change() { | |
| // Reset variables | |
| var dataset = [], | |
| coordinates = [], | |
| points = +this.value; | |
| // Recreate arrays | |
| makeDataset(dataset, points); | |
| makeCoordinates(coordinates, points); | |
| d3.select("#slider-value").text(points); | |
| // Remove old | |
| d3.selectAll(".dots").remove(); | |
| d3.selectAll(".lines").remove(); | |
| // North Horizontal Dots | |
| svg.selectAll("dots") | |
| .data(dataset) | |
| .enter().append("circle") | |
| .attr("class","dots") | |
| .attr("cx",function(d,i) { return (i+1) * (width/points); }) | |
| .attr("cy",0) | |
| .attr("r",2); | |
| // South Horizontal Dots | |
| svg.selectAll("dots") | |
| .data(dataset) | |
| .enter().append("circle") | |
| .attr("class","dots") | |
| .attr("cx",function(d,i) { return i * (width/points); }) | |
| .attr("cy",height) | |
| .attr("r",2); | |
| // West Vertical Dots | |
| svg.selectAll("dots") | |
| .data(dataset) | |
| .enter().append("circle") | |
| .attr("class","dots") | |
| .attr("cy",function(d,i) { return (i+1) * (height/points); }) | |
| .attr("cx",0) | |
| .attr("r",2); | |
| // East Vertical Dots | |
| svg.selectAll("dots") | |
| .data(dataset) | |
| .enter().append("circle") | |
| .attr("class","dots") | |
| .attr("cy",function(d,i) { return i * (height/points); }) | |
| .attr("cx",width) | |
| .attr("r",2); | |
| // Northwest lines | |
| svg.selectAll("lines") | |
| .data(coordinates) | |
| .enter().append("line") | |
| .attr("class","lines") | |
| .attr("x1", function(d,i) { return d[0] * (width/points); }) | |
| .attr("x2", 0) | |
| .attr("y1", 0) | |
| .attr("y2", function(d,i) { return d[1] * (height/points); }); | |
| // Southeast lines | |
| svg.selectAll("lines") | |
| .data(coordinates) | |
| .enter().append("line") | |
| .attr("class","lines") | |
| .attr("x2", function(d,i) { return (d[0] * (width/points)) - (width/points); }) | |
| .attr("x1", width) | |
| .attr("y2", height) | |
| .attr("y1", function(d,i) { return (d[1] * (height/points)) - (height/points); }); | |
| } // Finishes Change Function | |
| </script> | |
| </body> | |
| </html> |
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