キャンバスでデザインされた形で波を作成する方法を探しています。多くの調査の結果、私が望むものにかなり近いものを見つけました：
var c = document.getElementById('c'),
ctx = c.getContext('2d'),
cw = c.width = window.innerWidth,
ch = c.height = window.innerHeight,
points = [],
tick = 0,
opt = {
count: 5,
range: {
x: 20,
y: 80
},
duration: {
min: 20,
max: 40
},
thickness: 10,
strokeColor: '#444',
level: .35,
curved: true
},
rand = function(min, max) {
return Math.floor((Math.random() * (max - min + 1)) + min);
},
ease = function(t, b, c, d) {
if ((t /= d / 2) < 1) return c / 2 * t * t + b;
return -c / 2 * ((--t) * (t - 2) - 1) + b;
};
ctx.lineJoin = 'round';
ctx.lineWidth = opt.thickness;
ctx.strokeStyle = opt.strokeColor;
var Point = function(config) {
this.anchorX = config.x;
this.anchorY = config.y;
this.x = config.x;
this.y = config.y;
this.setTarget();
};
Point.prototype.setTarget = function() {
this.initialX = this.x;
this.initialY = this.y;
this.targetX = this.anchorX + rand(0, opt.range.x * 2) - opt.range.x;
this.targetY = this.anchorY + rand(0, opt.range.y * 2) - opt.range.y;
this.tick = 0;
this.duration = rand(opt.duration.min, opt.duration.max);
}
Point.prototype.update = function() {
var dx = this.targetX - this.x;
var dy = this.targetY - this.y;
var dist = Math.sqrt(dx * dx + dy * dy);
if (Math.abs(dist) <= 0) {
this.setTarget();
} else {
var t = this.tick;
var b = this.initialY;
var c = this.targetY - this.initialY;
var d = this.duration;
this.y = ease(t, b, c, d);
b = this.initialX;
c = this.targetX - this.initialX;
d = this.duration;
this.x = ease(t, b, c, d);
this.tick++;
}
};
Point.prototype.render = function() {
ctx.beginPath();
ctx.arc(this.x, this.y, 3, 0, Math.PI * 2, false);
ctx.fillStyle = '#000';
ctx.fill();
};
var updatePoints = function() {
var i = points.length;
while (i--) {
points[i].update();
}
};
var renderPoints = function() {
var i = points.length;
while (i--) {
points[i].render();
}
};
var renderShape = function() {
ctx.beginPath();
var pointCount = points.length;
ctx.moveTo(points[0].x, points[0].y);
var i;
for (i = 0; i < pointCount - 1; i++) {
var c = (points[i].x + points[i + 1].x) / 2;
var d = (points[i].y + points[i + 1].y) / 2;
ctx.quadraticCurveTo(points[i].x, points[i].y, c, d);
}
ctx.lineTo(-opt.range.x - opt.thickness, ch + opt.thickness);
ctx.lineTo(cw + opt.range.x + opt.thickness, ch + opt.thickness);
ctx.closePath();
ctx.fillStyle = 'hsl(' + (tick / 2) + ', 80%, 60%)';
ctx.fill();
ctx.stroke();
};
var clear = function() {
ctx.clearRect(0, 0, cw, ch);
};
var loop = function() {
window.requestAnimFrame(loop, c);
tick++;
clear();
updatePoints();
renderShape();
//renderPoints();
};
var i = opt.count + 2;
var spacing = (cw + (opt.range.x * 2)) / (opt.count - 1);
while (i--) {
points.push(new Point({
x: (spacing * (i - 1)) - opt.range.x,
y: ch - (ch * opt.level)
}));
}
window.requestAnimFrame = function() {
return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(a) {
window.setTimeout(a, 1E3 / 60)
}
}();
loop();canvas {
display: block;
}<canvas id="c"></canvas>http://codepen.io/jackrugile/pen/BvLHg
問題は、波の動きが少し非現実的に見えることです。このランダムな動きの概念を維持し、左から右に移動することによって繰り返される形状を持たないようにしたいのですが、「現実的な」水の動きを作成する方法を見つけられれば素晴らしいと思います (優れた流体力学、この波はそのコンテナーのエッジ (カスタム シェイプ) を含みます)。
私は多くのことを尋ねていると思いますが...小さな研究が役立つかもしれません:)
