html5 canvas正弦波像素网格波浪动画特效,波浪弧度起伏有一种3D视觉效果。
js代码
<script>
var canvas = document.body.querySelector('canvas'),
ctx = canvas.getContext('2d'),
W = canvas.width = window.innerWidth,
H = canvas.height = window.innerHeight,
pixels = [];
for (var x = -400; x < 400; x += 5) {
for (var z = -250; z < 250; z += 5) {
pixels.push({x: x, y: 100, z: z});
}
}
function render(ts) {
var imageData = ctx.getImageData(0, 0, W, H),
len = pixels.length,
fov = 250,
pixel, scale,
x2d, y2d, c;
for (var i = 0; i < len; i++) {
pixel = pixels[i];
scale = fov / (fov + pixel.z);
x2d = pixel.x * scale + W / 2;
y2d = pixel.y * scale + H / 2;
if(x2d >= 0 && x2d <= W && y2d >= 0 && y2d <= H) {
c = (Math.round(y2d) * imageData.width + Math.round(x2d)) * 4;
imageData.data[c] = 17;
imageData.data[c + 1] = 122;
imageData.data[c + 2] = 181;
imageData.data[c + 3] = 255;
}
pixel.z -= 0.4;
pixel.y = H / 14 + Math.sin(i / len * 15 + (ts / 450)) * 10;
if (pixel.z < -fov) pixel.z += 2 * fov;
}
ctx.putImageData(imageData, 0, 0);
}
(function drawFrame(ts){
requestAnimationFrame(drawFrame, canvas);
ctx.fillStyle = '#17293a';
ctx.fillRect(0, 0, W, H);
render(ts);
}());</script>
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