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Inner circle movement, moving bg stars & bg blur
Feature requests are from lively subreddit
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| let n = 256 | ||
| let w = document.documentElement.clientWidth | ||
| let h = document.documentElement.clientHeight | ||
| let x_mid = Math.round(w / 2) | ||
| let y_mid = Math.round(h / 2) | ||
| let z = (w + h) / 2 | ||
| let star_color_ratio = 1 / z | ||
| let star_x_save, star_y_save | ||
| let star_ratio = 256 | ||
| let star_speed = 4 | ||
| let stars = [] | ||
|
|
||
| let context | ||
|
|
||
| function init() { | ||
| for (let i = 0; i < n; i++) { | ||
| stars.push({ | ||
| x: Math.random() * w * 2 - x_mid * 2, | ||
| y: Math.random() * h * 2 - y_mid * 2, | ||
| speed: Math.round(Math.random() * z), | ||
| new_x: 0, | ||
| new_y: 0, | ||
| size: Math.round(Math.random() * 6 + 2), | ||
| }) | ||
| } | ||
| let starfield = document.getElementById("starfield") | ||
| starfield.width = w | ||
| starfield.height = h | ||
| context = starfield.getContext("2d") | ||
| context.lineCap = "round" | ||
| // context.filter = "blur(1px)" | ||
| } | ||
|
|
||
| function anim() { | ||
| context.clearRect(0, 0, w, h) | ||
| context.strokeStyle = starColor | ||
| context.globalAlpha = starOpacity / 100 | ||
| context.shadowBlur = starGlow | ||
| context.shadowColor = starColor | ||
|
|
||
| if (showStars && star_speed) { | ||
| for (let star of stars) { | ||
| star_x_save = star.new_x | ||
| star_y_save = star.new_y | ||
| star.speed -= star_speed | ||
| if (star.speed < 0) { | ||
| star.speed += z | ||
| } | ||
| star.new_x = x_mid + (star.x / star.speed) * star_ratio | ||
| star.new_y = y_mid + (star.y / star.speed) * star_ratio | ||
| if (star_x_save > 0 && star_x_save < w && star_y_save > 0 && star_y_save < h) { | ||
| context.lineWidth = (1 - star_color_ratio * star.speed) * 2 | ||
| context.beginPath() | ||
| context.lineWidth = star.size | ||
| context.moveTo(star_x_save, star_y_save) | ||
| context.lineTo(star_x_save, star_y_save) | ||
| // context.lineTo(star.new_x, star.new_y) | ||
| context.stroke() | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| init() | ||
| setInterval(anim, 16) | ||
| // anim() |