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forked from jonsadka's block: Generative art
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February 8, 2017 18:27
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Generative art with dashes
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| path { | |
| animation: dash 2s linear infinite; | |
| } | |
| @keyframes dash { | |
| to { | |
| stroke-dashoffset: -16; | |
| } | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| // Feel free to change or delete any of the code you see in this editor! | |
| var width = 960; | |
| var height = 500; | |
| var svg = d3.select('body').append('svg') | |
| .attr('width', width) | |
| .attr('height', height) | |
| var currentPath = 'M100,100 200,100'; | |
| var pos = {x: 200, y: 100}; | |
| var dash = {fill: 40, space: 10}; | |
| var direction = getNewDirection(); | |
| var boundary = { | |
| top: 0, bottom: height, left: 0, right: width | |
| } | |
| svg.append('path') | |
| .attr('class', 'special--line') | |
| .attr('d', currentPath) | |
| .attr('stroke', '#13939A') | |
| .attr('fill', 'none') | |
| .attr('stroke-width', 1) | |
| function updateLine(){ | |
| direction = getNewDirection(direction); | |
| pos = getNewLocation(pos, direction); | |
| currentPath = `${currentPath} ${pos.x},${pos.y}`; | |
| dash.fill += 5 | |
| dash.space += 1 | |
| d3.select('.special--line') | |
| .transition() | |
| .attr('stroke-dasharray', `${dash.fill} ${dash.space}`) | |
| .attr('d', currentPath); | |
| } | |
| function getNewDirection(current) { | |
| if (current === 'right') return 'down'; | |
| if (current === 'down') return 'left'; | |
| if (current === 'left') return 'up'; | |
| return 'right'; | |
| } | |
| function getNewLocation(location, direction) { | |
| const movedDistance = Math.round(Math.random()*200); | |
| if (direction === 'right'){ | |
| location.x += movedDistance; | |
| location.x = Math.min(location.x, boundary.right); | |
| } else if (direction === 'down') { | |
| location.y -= movedDistance; | |
| location.y = Math.max(location.y, boundary.top); | |
| } else if (direction === 'left') { | |
| location.x -= movedDistance; | |
| location.x = Math.max(location.x, boundary.left); | |
| } else { | |
| location.y += movedDistance; | |
| location.y = Math.min(location.y, boundary.bottom); | |
| } | |
| return location; | |
| } | |
| setInterval(updateLine, 60) | |
| </script> | |
| </body> |
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