Canvas龟甲花菱

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JavaScript

(function () {
  'use strict';
  window.addEventListener('load', function () {
    var canvas = document.getElementById('canvas');

if (!canvas || !canvas.getContext) {
      return false;
    }

/********************
      Random Number
    ********************/

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

/********************
      Change Title
    ********************/
    
    var title = document.getElementById('title');
    title.textContent = 'KIKKOUHANABISHI / ?甲花菱';

/********************
      Var
    ********************/

var ctx = canvas.getContext('2d');
    var X = canvas.width = window.innerWidth;
    var Y = canvas.height = window.innerHeight;
    var mouseX = null;
    var mouseY = null;
    var shapeNum;
    var shapes = [];
    var height = 200;
    var dist = Math.cos(30 * Math.PI / 180) * height;
    var rad = Math.PI * 2 / 6;
    var ease = 0.3;
    var friction = 0.9;
    var style = {
      black: 'black',
      white: 'white',
      lineWidth: 5,
    };
    X > Y ? shapeNum = X / dist : shapeNum = Y / (height / 2 + height / 4);

/********************
      Animation
    ********************/

window.requestAnimationFrame =
      window.requestAnimationFrame ||
      window.mozRequestAnimationFrame ||
      window.webkitRequestAnimationFrame ||
      window.msRequestAnimationFrame ||
      function(cb) {
        setTimeout(cb, 17);
      };

/********************
      Shape
    ********************/
    
    function Shape(ctx, x, y, i, j) {
      this.ctx = ctx;
      this.init(x, y, i, j);
    }
    
    Shape.prototype.init = function(x, y, i, j) {
      this.x = x;
      this.y = y;
      this.i = i;
      this.j = j;
      this.xi = rand(0, X);
      this.yi = rand(0, Y);
      this.r = height / 2;
      this.dia = Math.sqrt(this.r * this.r + this.r * this.r);
      this.v = {
        x: 0,
        y: 0
      };
      this.a = 0;
      this.rad = this.a * Math.PI / 180;
    };

Shape.prototype.draw = function() {
      var ctx  = this.ctx;
      ctx.save();
      ctx.strokeStyle = style.white;
      ctx.lineWidth = style.lineWidth;
      ctx.beginPath();
      for (var i = 0; i < 6; i++) {
        var x = Math.sin(i * rad);
        var y = Math.cos(i * rad);
        if (i === 0) ctx.moveTo(x * this.r + this.xi, y * this.r + this.yi);
        ctx.lineTo(x * this.r + this.xi, y * this.r + this.yi);
      }
      ctx.closePath();
      ctx.stroke();
      ctx.lineWidth = style.lineWidth / 2;
      ctx.beginPath();
      for (var i = 0; i < 6; i++) {
        var x = Math.sin(i * rad);
        var y = Math.cos(i * rad);
        if (i === 0) ctx.moveTo(x * this.r / 1.5 + this.xi, y * this.r / 1.5 + this.yi);
        ctx.lineTo(x * this.r / 1.5 + this.xi, y * this.r / 1.5 + this.yi);
      }
      ctx.closePath();
      ctx.stroke();
      ctx.translate(this.xi, this.yi);
      ctx.rotate(Math.tan(this.rad));
      ctx.translate(-this.xi, -this.yi);
      ctx.lineWidth = 0;
      ctx.fillStyle = style.white;
      for (var i = 0; i < 4; i++) {
        ctx.translate(this.xi, this.yi);
        ctx.rotate(90 * Math.PI / 180);
        ctx.translate(-this.xi, -this.yi);
        ctx.beginPath();
        ctx.moveTo(this.xi, this.yi);
        ctx.quadraticCurveTo(this.xi - this.r / 4, this.yi - this.r / 4, this.xi, this.yi - this.r / 2);
        ctx.quadraticCurveTo(this.xi + this.r / 4, this.yi - this.r / 4, this.xi, this.yi);
        ctx.closePath();
        ctx.fill();
      }
      ctx.fillStyle = style.black;
      for (var i = 0; i < 4; i++) {
        ctx.translate(this.xi, this.yi);
        ctx.rotate(90 * Math.PI / 180);
        ctx.translate(-this.xi, -this.yi);
        ctx.beginPath();
        ctx.moveTo(this.xi, this.yi);
        ctx.quadraticCurveTo(this.xi - this.r / 8, this.yi - this.r / 8, this.xi, this.yi - this.r / 3);
        ctx.quadraticCurveTo(this.xi + this.r / 8, this.yi - this.r / 8, this.xi, this.yi);
        ctx.closePath();
        ctx.fill();
      }
      ctx.beginPath();
      ctx.fillStyle = style.white;
      ctx.arc(this.xi, this.yi, this.r / 20, 0, Math.PI * 2, false);
      ctx.fill();
      ctx.restore();
    };

Shape.prototype.updatePosition = function() {
      this.v.x += (this.xi - this.x) * ease;
      this.v.y += (this.yi - this.y) * ease;
      this.v.x *= friction;
      this.v.y *= friction;
      this.xi -= this.v.x / 100;
      this.yi -= this.v.y / 100;
    };

Shape.prototype.updateParams = function() {
      if (this.j % 2 === 0) {
        this.a += 1;
      } else {
        this.a -= 1;
      }
      this.rad = this.a * Math.PI / 180;
    };

Shape.prototype.render = function() {
      this.updateParams();
      this.updatePosition();
      this.draw();
    };

for (var i = 0; i < shapeNum + 1; i++) {
      for (var j = 0; j < shapeNum + 1; j++) {
        if (X > Y) {
          if (j * dist - dist - dist > Y) break;
        } else {
          if (j * (height / 2 + height / 4) - (height / 2 + height / 4) > Y) break;
        }
        var s;
        if (j % 2 !== 0) {
          s = new Shape(ctx, dist * i + dist / 2, (height / 2 + height / 4) * j, i, j);
        } else {
          s = new Shape(ctx, dist * i, (height / 2 + height / 4) * j, i, j);
        }
        shapes.push(s);
      }
    }

/********************
      Render
    ********************/
    
    function render() {
      ctx.clearRect(0, 0, X, Y);
      for (var i = 0; i < shapes.length; i++) {
        shapes[i].render(i);
      }
      requestAnimationFrame(render);
    }

render();

/********************
      Event
    ********************/
    
    function onResize() {
      X = canvas.width = window.innerWidth;
      Y = canvas.height = window.innerHeight;
      X > Y ? shapeNum = X / dist : shapeNum = Y / (height / 2 + height / 4);
      shapes = [];
      for (var i = 0; i < shapeNum + 1; i++) {
        for (var j = 0; j < shapeNum + 1; j++) {
          if (X > Y) {
            if (j * dist - dist - dist > Y) break;
          } else {
            if (j * (height / 2 + height / 4) - (height / 2 + height / 4) > Y) break;
          }
          var s;
          if (j % 2 !== 0) {
            s = new Shape(ctx, dist * i + dist / 2, (height / 2 + height / 4) * j, i, j);
          } else {
            s = new Shape(ctx, dist * i, (height / 2 + height / 4) * j, i, j);
          }
          shapes.push(s);
        }
      }
    }

window.addEventListener('resize', function() {
      onResize();
    });

});

})();

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