javascript - 如何更改 smoke.js 中烟雾的颜色？

Question

好的，所以我正在使用这个 CodePen 中的脚本:

var smokemachine = function(context, color) {
  color = color || [245, 46.8, 48.2]
  var polyfillAnimFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame ||
    window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
  var lastframe;
  var currentparticles = []
  var pendingparticles = []

  var buffer = document.createElement('canvas'),
    bctx = buffer.getContext('2d')

  buffer.width = 20
  buffer.height = 20

  var opacities = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 5, 5, 7, 4, 4, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 17, 27, 41, 52, 56, 34, 23, 15, 11, 4, 9, 5, 1, 0, 0, 0, 0, 0, 0, 1, 45, 63, 57, 45, 78, 66, 52, 41, 34, 37, 23, 20, 0, 1, 0, 0, 0, 0, 1, 43, 62, 66, 64, 67, 115, 112, 114, 56, 58, 47, 33, 18, 12, 10, 0, 0, 0, 0, 39, 50, 63, 76, 87, 107, 105, 112, 128, 104, 69, 64, 29, 18, 21, 15, 0, 0, 0, 7, 42, 52, 85, 91, 103, 126, 153, 128, 124, 82, 57, 52, 52, 24, 1, 0, 0, 0, 2, 17, 41, 67, 84, 100, 122, 136, 159, 127, 78, 69, 60, 50, 47, 25, 7, 1, 0, 0, 0, 34, 33, 66, 82, 113, 138, 149, 168, 175, 82, 142, 133, 70, 62, 41, 25, 6, 0, 0, 0, 18, 39, 55, 113, 111, 137, 141, 139, 141, 128, 102, 130, 90, 96, 65, 37, 0, 0, 0, 2, 15, 27, 71, 104, 129, 129, 158, 140, 154, 146, 150, 131, 92, 100, 67, 26, 3, 0, 0, 0, 0, 46, 73, 104, 124, 145, 135, 122, 107, 120, 122, 101, 98, 96, 35, 38, 7, 2, 0, 0, 0, 50, 58, 91, 124, 127, 139, 118, 121, 177, 156, 88, 90, 88, 28, 43, 3, 0, 0, 0, 0, 30, 62, 68, 91, 83, 117, 89, 139, 139, 99, 105, 77, 32, 1, 1, 0, 0, 0, 0, 0, 16, 21, 8, 45, 101, 125, 118, 87, 110, 86, 64, 39, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 28, 79, 79, 117, 122, 88, 84, 54, 46, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 6, 55, 61, 68, 71, 30, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 14, 23, 25, 20, 12, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 12, 9, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0]

  var data = bctx.createImageData(20, 20)
  var d = data.data

  for (var i = 0; i < d.length; i += 4) {
    d[i] = color[0]
    d[i + 1] = color[1]
    d[i + 2] = color[2]
    d[i + 3] = opacities[i / 4]
  }

  bctx.putImageData(data, 0, 0)

  var imagewidth = 20 * 5
  var imageheight = 20 * 5

  function particle(x, y, l) {
    this.x = x
    this.y = y
    this.age = 0
    this.vx = (Math.random() * 8 - 4) / 100
    this.startvy = -(Math.random() * 30 + 10) / 100
    this.vy = this.startvy
    this.scale = Math.random() * .5
    this.lifetime = Math.random() * l + l / 2
    this.finalscale = 5 + this.scale + Math.random()

    this.update = function(deltatime) {
      this.x += this.vx * deltatime
      this.y += this.vy * deltatime
      var frac = Math.pow((this.age) / this.lifetime, .5)
      this.vy = (1 - frac) * this.startvy
      this.age += deltatime
      this.scale = frac * this.finalscale
    }

    this.draw = function() {
      context.globalAlpha = (1 - Math.abs(1 - 2 * (this.age) / this.lifetime)) / 8
      var off = this.scale * imagewidth / 2
      var xmin = this.x - off
      var xmax = xmin + this.scale * imageheight
      var ymin = this.y - off
      var ymax = ymin + this.scale * imageheight
      context.drawImage(buffer, xmin, ymin, xmax - xmin, ymax - ymin)
    }
  }


  function addparticles(x, y, n, lifetime) {
    lifetime = lifetime || 4000
    n = n || 10
    if (n < 1) return Math.random() <= n && pendingparticles.push(new particle(x, y, lifetime));
    for (var i = 0; i < n; i++) {
      pendingparticles.push(new particle(x, y, lifetime))
    };
  }

  function updateanddrawparticles(deltatime) {
    context.clearRect(0, 0, canvas.width, canvas.height);
    deltatime = deltatime || 16
    var newparticles = []
    currentparticles = currentparticles.concat(pendingparticles)
    pendingparticles = []

    currentparticles.forEach(function(p) {
      p.update(deltatime)
      if (p.age < p.lifetime) {
        p.draw()
        newparticles.push(p)
      }
    })
    currentparticles = newparticles
  }

  function frame(time) {
    if (running) {
      var deltat = time - lastframe
      lastframe = time;

      updateanddrawparticles(deltat)

      polyfillAnimFrame(frame)
    }
  }

  var running = false

  function start() {
    running = true
    polyfillAnimFrame(function(time) {
      lastframe = time
      polyfillAnimFrame(frame)
    })
  }

  function stop() {
    running = false
  }

  return {
    start: start,
    stop: stop,
    step: updateanddrawparticles,
    addsmoke: addparticles
  }

}



var canvas = document.getElementById('canvas')
var ctx = canvas.getContext('2d')
canvas.width = innerWidth
canvas.height = innerHeight

var party = smokemachine(ctx, [254, 16.8, 18.2])
party.start() // start animating

onmousemove = function(e) {
  var x = e.clientX
  var y = e.clientY
  var n = .5
  var t = Math.floor(Math.random() * 200) + 3800
  party.addsmoke(x, y, n, t)
}

setInterval(function() {
  party.addsmoke(innerWidth / 2, innerHeight, 1)
}, 100)

html,
body {
  position: absolute;
  margin: 0;
  width: 100%;
}

#hi {
  position: absolute;
  top: 40%;
  width: 100%;
  text-align: center;
}

#hi a {
  color: #fff;
  font-size: 80px;
  text-decoration: none;
  font-family: Lobster;
}

<body cz-shortcut-listen="true">
  <a href="https://github.com/bijection/smoke.js">
    <img style="width: 150px; position: absolute; top: 0; right: 0; border: 0;" src="./github.png" alt="Spoon me on GitHub">
  </a>
  <canvas id="canvas" width="1777" height="898"></canvas>
  <div id="hi">
    <a href="https://github.com/bijection/smoke.js">
		smoke.js
	</a>
  </div>
</body>

在脚本框中，您会看到它如何显示颜色的 RGB 值，我想改变它会做到这一点，但事实并非如此，我已经尽我所能地查看了所有可能改变颜色的东西，但就是这样'好像找不到，谁能帮帮我？

我正在努力使它看起来像普通的灰色烟雾。

我需要知道如何做的第二件事是将它从中心移开，再次尝试所有我能想到的东西。我目前在每个底 Angular 有两个 float DIV，我将 Canvas 放在左侧 float div 中，它仍然会强制它到中间，即使在我将 Canvas div 添加到 float div 之前 div 在 Angular 落工作时也是如此。

我使用的 float DIV 代码是:

    <!-- Smoke Left -->
                     <div id="floatLogo">
<canvas id="canvas" width="1777" height="898"></canvas>
<div id="hi"></div>
</div>  

使用以下的 CSS:

#floatLogo {
    width:auto;
    height:auto;
    padding:5px 2px;
    text-align:center;
        position: fixed;
bottom: 0;
left: 0;

在我将 Canvas 添加到其中之前，DIV 完美地向左浮动，现在它被迫居中

Answer 1

这样就可以了，将 MYCOLORCODEHERE 替换为您想要的颜色；

var ctx = canvas.getContext('2d')

var party = smokemachine(ctx,MYCOLORCODEHERE)
party.addsmoke(500,500)
party.start()

来自文档:

smokemachine(context, [r,g,b])

Returns a smoke machine that makes smoke.

context — the context of the canvas we wanna draw smoke on [r,g,b] — (optional) the color we want the smoke to be var party = smokemachine(context, [1,5,253])

此处:https://github.com/bijection/smoke.js