特效描述：利用HTML5实现 Canvas 幽灵鬼魂 动画特效。利用HTML5实现Canvas幽灵鬼魂动画特效
代码结构
1. 引入JS
2. HTML代码
var blobs = [];
function setup() {
var iHeight = window.innerHeight;
if (iHeight < 500) {
iHeight = 500;
}
createCanvas(window.innerWidth, iHeight);
drawingContext.shadowOffsetX = 0;
drawingContext.shadowOffsetY = 0;
drawingContext.shadowBlur = 60;
drawingContext.shadowColor = "rgb(255, 176, 190)";
for (var i = 0; i < 13; i++) {
blobs.push(new Blob(random(width), random(height)));
}
}
function draw() {
background(13, 33);
for (var b = 0; b < blobs.length; b++) {
blobs[b].update();
blobs[b].show();
}
}
function Blob(x, y) {
this.pos = createVector(x, y);
this.vel = p5.Vector.random2D();
this.vel.mult(random(1, 3));
this.r = random(42, 72);
this.yoff = random(1000);
this.update = function() {
this.pos.add(this.vel);
if (this.pos.x > width || this.pos.x < 0) {
this.vel.x *= -1;
}
if (this.pos.y > height || this.pos.y < 0) {
this.vel.y *= -1;
}
}
this.show = function() {
noStroke();
fill(255);
push();
translate(this.pos.x, this.pos.y);
beginShape();
var xoff = 0;
for (var a = 0; a < TWO_PI; a += 0.1) {
var offset;
if (a > PI/6 && a < 5 * PI/6) {
offset = map(noise(xoff, this.yoff), 0, 1, -0.31 * this.r, 0.78 * this.r);
} else {
offset = map(noise(xoff, this.yoff), 0, 1, -0.08 * this.r, 0.08 * this.r);
}
var r = this.r + offset;
var x = r * cos(a);
var y = r * sin(a);
vertex(x, y);
xoff += 0.1;
}
endShape(CLOSE);
this.yoff += 0.08;
pop();
var eyeOffset = 0.23 * this.r;
stroke(54);
fill(54);
ellipse(this.pos.x - eyeOffset, this.pos.y - eyeOffset, 0.16 * this.r, 0.23 * this.r);
ellipse(this.pos.x + eyeOffset, this.pos.y - eyeOffset, 0.16 * this.r, 0.23 * this.r);
strokeWeight(4);
line(this.pos.x - eyeOffset * 2, this.pos.y - eyeOffset * 2, this.pos.x, this.pos.y - eyeOffset);
line(this.pos.x + eyeOffset * 2, this.pos.y - eyeOffset * 2, this.pos.x, this.pos.y - eyeOffset);
fill(255);
noStroke();
ellipse(this.pos.x - eyeOffset, this.pos.y - eyeOffset - 3, 0.08 * this.r, 0.125 * this.r);
ellipse(this.pos.x + eyeOffset, this.pos.y - eyeOffset - 3, 0.08 * this.r, 0.125 * this.r);
fill(54);
arc(this.pos.x, this.pos.y, 0.5 * this.r, 0.5 * this.r, 0, PI);
}
}
