This block uses SVG's linearGradient element and D3 selections to create a linear gradient. Rather than having just two colors, this gradient uses a six-color rainbow spectrum.
Drag the circles to change the gradient's orientation.
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October 31, 2016 16:45
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Fun with Linear Gradients II
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| license: gpl-3.0 |
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| <html> | |
| <head> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| .position-circle { | |
| stroke: #000; | |
| stroke-width: 2px; | |
| fill: #3a403d; | |
| cursor: all-scroll; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var width = window.innerWidth, height = window.innerHeight; | |
| var colors = ["#ff0000", "#ffb400", "#fff800", "#02ff00", "#005fff", "#9a01ff"]; | |
| var position = [[.1, .1], [.9, .9]]; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var defs = svg.append("defs"); | |
| var gradient = defs.append("linearGradient") | |
| .attr("id", "linear-gradient"); | |
| colors.forEach(function(d, i){ | |
| gradient.append("stop") | |
| .attr("offset", i / (colors.length - 1) * 100 + "%") | |
| .attr("stop-color", colors[i]); | |
| }); | |
| svg.append("rect") | |
| .attr("class", "gradient-rectangle") | |
| .attr("x", "0") | |
| .attr("y", "0") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .style("fill", "url(#linear-gradient)"); | |
| changeOrientation(position); | |
| position.forEach(function(d, i){ | |
| svg.append("circle") | |
| .attr("class", "position-circle") | |
| .attr("data-which", i) | |
| .attr("cx", width * position[i][0]) | |
| .attr("cy", height * position[i][1]) | |
| .attr("r", "20") | |
| .call(d3.drag(d) | |
| .on("drag", function(){ | |
| var x = d3.event.x, y = d3.event.y; | |
| d3.select(this).attr("cx", x); | |
| d3.select(this).attr("cy", y); | |
| if (d3.select(this).attr("data-which") == 0) { | |
| position[0][0] = x / width; | |
| position[0][1] = y / height; | |
| } else { | |
| position[1][0] = x / width; | |
| position[1][1] = y / height; | |
| } | |
| changeOrientation(position); | |
| })); | |
| }); | |
| function changeOrientation(position){ | |
| gradient | |
| .attr("x1", position[0][0] * 100 + "%") | |
| .attr("y1", position[0][1] * 100 + "%") | |
| .attr("x2", position[1][0] * 100 + "%") | |
| .attr("y2", position[1][1] * 100 + "%"); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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