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triangles path mask
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| license: mit |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> /* set the CSS */ | |
| </style> | |
| <body> | |
| <!-- load the d3.js library --> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/snap.svg/0.5.1/snap.svg-min.js"></script> | |
| <script> | |
| var margin = { | |
| top: 10, | |
| right: 10, | |
| bottom: 10, | |
| left: 10 | |
| }, | |
| width = 960 - margin.left - margin.right, | |
| height = 640 - margin.top - margin.bottom; | |
| var svg = d3 | |
| .select("body") | |
| .append("svg") | |
| .attr("id", "svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| var palette = ["#E76F51", "#F4A261", "#E9C46A", "#2A9D8F", "#264653"]; | |
| var colorScale = d3 | |
| .scaleLinear() | |
| .domain(d3.range(5)) | |
| .range(palette); | |
| //filtering path | |
| var snap = Snap("#svg"); | |
| var path = snap | |
| .path( | |
| "M400 0 L260 200 L540 200 Z M260 200 L120 400 L400 400 Z M540 200 L400 400 L680 400 Z" | |
| ) | |
| .attr({ | |
| fill: "red", | |
| "fill-opacity": "0" | |
| }); | |
| var bbox = path.getBBox(); | |
| var n_circle = 800; | |
| var randomData = function() { | |
| var dataset = []; | |
| for (var i = 0; i < n_circle; i++) { | |
| var x = d3.randomUniform(bbox.x, bbox.x + bbox.width)(); | |
| var y = d3.randomUniform(0, bbox.height)(); | |
| var r = d3.randomUniform(2, 12)(); | |
| dataset.push({ x, y, r }); | |
| } | |
| return dataset; | |
| }; | |
| var data = randomData(); | |
| var color = "#E76F51"; | |
| var triangleSize = 25; | |
| var verticalTransform = Math.sqrt(triangleSize); | |
| //draw circle | |
| svg | |
| .selectAll("dot") | |
| .data(data) | |
| .enter() | |
| .append("circle") | |
| .attr("r", d => d["r"]) | |
| .attr("cx", d => d["x"]) | |
| .attr("cy", d => d["y"]) | |
| .style("fill", d => colorScale(Math.floor(Math.random() * 5))) | |
| .style("fill-opacity", function(d, i) { | |
| return Snap.path.isPointInside(path, d["x"], d["y"]) ? "0.8" : "0"; | |
| }); | |
| //transition for radius | |
| var update = function() { | |
| var newRadius = []; | |
| for (var i = 0; i < n_circle; i++) { | |
| var r = d3.randomUniform(2, 12)(); | |
| newRadius[i] = r; | |
| } | |
| svg | |
| .selectAll("circle") | |
| .data(newRadius) | |
| .transition() | |
| .duration(600) | |
| .ease(d3.easeCubic) | |
| .attr("r", d => d); | |
| }; | |
| //repeat | |
| setInterval(function() { | |
| update(); | |
| }, 512); | |
| </script> | |
| </body> |
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