Created
February 3, 2017 01:38
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| body { | |
| background-color: rgb(10,10,10); | |
| } | |
| #header { | |
| z-index: 1; | |
| position:absolute; | |
| width: 100%; | |
| height:20%; | |
| left: 0; | |
| top: 0; | |
| opacity:.5; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <img id="header" src="http://neongrid.space/img/neongrid_nobg.png"> | |
| <script> | |
| LINE_THICKNESS = 1; | |
| MAX_STEPS = 10000; | |
| MAX_GAP = 90; | |
| MIN_GAP = 10; | |
| function mkcanvas() { | |
| var canv = document.createElement('canvas'); | |
| var header = document.querySelector('#header'); | |
| canv.width = header.width; | |
| canv.height = header.height; | |
| console.log(canv); | |
| console.log(header.height); | |
| return canv; | |
| } | |
| function draw_lines(canv, ctx, gap) { | |
| ctx.clearRect(0,0,canv.width,canv.height) | |
| ctx.fillStyle = 'rgb(200,0,200)'; | |
| for (x = gap; x < canv.width; x += gap) { | |
| ctx.fillRect(x, 0, LINE_THICKNESS, canv.height); | |
| } | |
| for (y = gap; y < canv.height; y += gap) { | |
| ctx.fillRect(0, y, canv.width, LINE_THICKNESS); | |
| } | |
| } | |
| function animate(canv) { | |
| var ctx = canv.getContext('2d'); | |
| var frame = 0; | |
| var line_gap = MIN_GAP; | |
| var growth = 1; | |
| function do_step() { | |
| // do stuff | |
| if (frame == MAX_STEPS) { | |
| return; | |
| } | |
| frame += 1 | |
| draw_lines(canv, ctx, line_gap); | |
| if (line_gap == MAX_GAP) { | |
| growth = -1; | |
| } else if (line_gap == MIN_GAP) { | |
| growth = 1; | |
| } | |
| line_gap += growth; | |
| window.requestAnimationFrame(do_step); | |
| } | |
| window.requestAnimationFrame(do_step); | |
| } | |
| function go() { | |
| var body = document.querySelector('body'); | |
| var canv = mkcanvas(); | |
| body.appendChild(canv); | |
| animate(canv); | |
| } | |
| go(); | |
| </script> | |
| </body> | |
| </html> |
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