From 636b62aa6d0d77e19a4b7bb3c039924eeb217a71 Mon Sep 17 00:00:00 2001
From: Jules Laplace <julescarbon@gmail.com>
Date: Sat, 3 Mar 2018 05:38:35 +0100
Subject: hall demo

---
 client/draw.js | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 client/draw.js

(limited to 'client/draw.js')

diff --git a/client/draw.js b/client/draw.js
new file mode 100644
index 0000000..b68beaf
--- /dev/null
+++ b/client/draw.js
@@ -0,0 +1,86 @@
+import {
+  browser, requestAudioContext,
+  randint, randrange, clamp,
+} from './lib/util'
+
+import mouse from './lib/mouse'
+import color from './lib/color'
+
+let w, h
+let rx, ry
+
+const canvas = document.createElement('canvas')
+const ctx = canvas.getContext('2d')
+
+document.body.appendChild(canvas)
+document.body.addEventListener('resize', resize)
+resize()
+recenter()
+requestAnimationFrame(animate)
+
+function resize(){
+  w = canvas.width = window.innerWidth
+  h = canvas.height = window.innerHeight
+  clear()
+}
+function recenter(){
+  rx = randint(w), ry = randint(h)
+}
+function animate(t){
+  requestAnimationFrame(animate)
+  ctx.save()
+  ctx.globalAlpha = 0.0001
+  ctx.translate(w/2, h/2)
+  ctx.rotate(0.1)
+  ctx.translate(-rx, -ry)
+  ctx.drawImage(canvas, 0, 0)
+  ctx.restore()
+}
+function clear(n){
+  ctx.fillStyle = 'rgba(255,255,255,' + (n || 0.5) + ')'
+  ctx.fillRect(0,0,w,h)
+  recenter()
+}
+function triangle(px,py,r){
+  setTimeout( () => tri(px,py,r), Math.random()*10)
+  // setTimeout( () => tri(px,py,r), Math.random()*200)
+  // setTimeout( () => tri(px,py,r), Math.random()*300)
+}
+function tri(px, py, r) {
+  ctx.save()
+  ctx.globalCompositeOperation = 'multiply'
+  ctx.fillStyle = color((px+py)/(w+h), 0, 1, 1)
+  function p(){
+    let theta = randrange(0, Math.PI*2)
+    let x = px + Math.cos(theta) * r
+    let y = py + Math.sin(theta) * r
+    return { x, y }
+  }
+  ctx.beginPath()
+  const p0 = p(), p1 = p(), p2 = p()
+  ctx.moveTo(p0.x, p0.y)
+  ctx.lineTo(p1.x, p1.y)
+  ctx.lineTo(p2.x, p2.y)
+  ctx.lineTo(p0.x, p0.y)
+  ctx.fill()
+  ctx.restore()
+}
+function line(y){
+  ctx.beginPath()
+  ctx.moveTo(0, y)
+  ctx.lineTo(w, y)
+  ctx.strokeStyle = "#888"
+  ctx.strokeWidth = 1
+  ctx.stroke()
+}
+function dot(x, y, r){
+  ctx.fillStyle = "#f00"
+  ctx.beginPath()
+  ctx.moveTo(x, y)
+  ctx.arc(x, y, r, 0, 2*Math.PI)
+  ctx.fill()
+}
+
+export default {
+  triangle, clear, line, dot, ctx
+}
\ No newline at end of file
-- 
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