随机粒子背景

下载代码

html

css

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html

css

@import url("https://fonts.googleapis.com/css?family=Montserrat:200,300,400,600");
.more-pens {
  position: fixed;
  left: 20px;
  bottom: 20px;
  z-index: 10;
  font-family: "Montserrat";
  font-size: 12px;
}

a.white-mode, a.white-mode:link, a.white-mode:visited, a.white-mode:active {
  font-family: "Montserrat";
  font-size: 12px;
  text-decoration: none;
  background: #212121;
  padding: 4px 8px;
  color: #f7f7f7;
}
a.white-mode:hover, a.white-mode:link:hover, a.white-mode:visited:hover, a.white-mode:active:hover {
  background: #edf3f8;
  color: #212121;
}

body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  width: 100%;
  height: 100%;
  background: #FFFFFF;
}

.title {
  z-index: 10;
  position: absolute;
  left: 50%;
  top: 55%;
  transform: translateX(-50%) translateY(-50%);
  font-family: "Montserrat";
  text-align: center;
  width: 100%;
}
.title h1 {
  position: relative;
  color: #121212;
  font-weight: 600;
  font-size: 70px;
  padding: 0;
  margin: 0;
  line-height: 1;
}
.title h1 span {
  font-weight: 600;
  padding: 0;
  margin: 0;
  color: #121212;
}
.title h3 {
  font-weight: 200;
  font-size: 30px;
  padding: 0;
  margin: 0;
  line-height: 1;
  color: #121212;
  letter-spacing: 2px;
}
.title h4 {
  font-weight: 400;
  font-size: 16px;
  padding: 0;
  margin: 4px 0 0 0;
  line-height: 1;
  color: #CC3341;
  letter-spacing: 2px;
}

JavaScript

function drawCircleGrey(ctx, radius, position) {
  var grey = Math.round(100 + Math.random() * 155);

var rgbaFill = "rgba(" + grey + ", " + grey + ", " + grey + ", 1)";
  var rgbaStroke = "rgba(" + grey + ", " + grey + ", " + grey + ", 1)";
  ctx.beginPath();
  ctx.arc(position.x, position.y, radius, 0, 2 * Math.PI, false);
  ctx.fillStyle = rgbaFill;
  ctx.strokeStyle = rgbaStroke;
  if (radius < 3) {
    ctx.fillStyle = "#CC3341";
    ctx.strokeStyle = "#CC3341";
  }
  if (radius < 2) {
    ctx.fillStyle = "#B5E3E3";
    ctx.strokeStyle = "#B5E3E3";
  }
  ctx.fill();
  ctx.lineWidth = 1;
  ctx.stroke();
}

function hexToRGB(hex, alpha) {
  var r = parseInt(hex.slice(1, 3), 16),
      g = parseInt(hex.slice(3, 5), 16),
      b = parseInt(hex.slice(5, 7), 16);

if (alpha) {
    return "rgba(" + r + ", " + g + ", " + b + ", " + alpha + ")";
  } else {
    return "rgb(" + r + ", " + g + ", " + b + ")";
  }
}

function randomIntFromInterval(min, max) {
  return Math.floor(Math.random() * (max - min + 1) + min);
}

function getBoundingBoxPolygon(points) {
  var minX = null;
  var maxX = null;
  var minY = null;
  var maxY = null;
  for (var i = 0; i < points.length; i++) {
    var x = points[i].x;
    var y = points[i].y;
    if (minX == null) {
      minX = x;maxX = x;minY = y;maxY = y;
    }
    minX = Math.min(minX, x);
    maxX = Math.max(maxX, x);
    minY = Math.min(minY, y);
    maxY = Math.max(maxY, y);
  }

var width = maxX - minX;
  var height = maxY - minY;

return {
    x: minX,
    y: minY,
    width: width,
    height: height
  };
}

function addParticle() {
  // Externa points
  var vector = {
    x: Math.random() * WIDTH,
    y: Math.random() * HEIGHT
  };
  var vector_check = {
    x: vector.x - offsetX,
    y: vector.y - offsetY
  };

if (!pointIsInPolygon(vector_check, apple) && !pointIsInPolygon(vector_check, leaf)) {
    drawCircleGrey(canvas, Math.random() * 5, {
      x: vector.x,
      y: vector.y
    });
  }
}

//
var WIDTH = $(window).width();
var HEIGHT = $(window).height();
var leaf = [{ x: 179.9, y: 34.8 }, { x: 242.7, y: 0 }, { x: 222.1, y: 63.9 }, { x: 162.5, y: 92 }];
var apple = [{ x: 165.8, y: 114.8 }, { x: 194.3, y: 105.5 }, { x: 237.1, y: 96.2 }, { x: 297.4, y: 116.2 }, { x: 315.5, y: 136.2 }, { x: 293.8, y: 154 }, { x: 272.2, y: 212 }, { x: 299.1, y: 275.4 }, { x: 326.1, y: 293.4 }, { x: 300.9, y: 346.4 }, { x: 237.5, y: 399.4 }, { x: 204.9, y: 391.5 }, { x: 171.4, y: 383.7 }, { x: 134.9, y: 391.8 }, { x: 105.2, y: 400 }, { x: 35.2, y: 339.6 }, { x: 0, y: 218.6 }, { x: 30.7, y: 128.1 }, { x: 96.3, y: 97.3 }, { x: 136.5, y: 106 }];

var tela = document.createElement('canvas');
tela.width = $(window).width();
tela.height = $(window).height();
$("body").append(tela);

var canvas = tela.getContext('2d');
var leafBB = getBoundingBoxPolygon(leaf);
var appleBB = getBoundingBoxPolygon(apple);
var offsetX = WIDTH / 2 - appleBB.width / 2;
var offsetY = HEIGHT / 2 - (appleBB.height + leafBB.height) / 2;

setInterval(function () {
  for (var i = 0; i < 1; i++) {
    addParticle();
  }
}, 1);

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