【发布时间】：2017-07-14 11:20:04
【问题描述】：
我花了很多时间在我的网站上创建了这个非常酷的徽标动画！我制作的徽标动画与徽标图像大小相同，我可以轻松地将其应用到网站上。
问题是我网站上的徽标设置为在屏幕宽度达到某个点后开始缩小。它设置了最大宽度，但也设置为缩放到其父 div 的大小。我的动画不这样做......我意识到在将我的徽标动画应用到我的网站之前我需要弄清楚这一点。因为它的行为方式不同......而且我真的不想使用 css 缩放和媒体查询，因为那会一团糟。
这是我的动画。
// Create an array to store our particles
var particles = [];
// The amount of particles to render
var particleCount = 10;
// The maximum velocity in each direction
var maxVelocity = 3;
// The target frames per second (how often do we want to update / redraw the scene)
var targetFPS = 33;
// Set the dimensions of the canvas as variables so they can be used.
var canvasWidth = 400;
var canvasHeight = 400;
// Create an image object (only need one instance)
var imageObj = new Image();
// Once the image has been downloaded then set the image on all of the particles
imageObj.onload = function() {
particles.forEach(function(particle) {
particle.setImage(imageObj);
});
};
// Once the callback is arranged then set the source of the image
imageObj.src = "http://www.freeiconspng.com/uploads/misc-cloud-smoke-element-png-by-dbszabo1-on-deviantart-19.png";
// A function to create a particle object.
function Particle(context) {
// Set the initial x and y positions
this.x = 0;
this.y = 0;
// Set the initial velocity
this.xVelocity = 0;
this.yVelocity = 0;
// Set the radius
this.radius = 5;
// Store the context which will be used to draw the particle
this.context = context;
// The function to draw the particle on the canvas.
this.draw = function() {
// If an image is set draw it
if(this.image){
this.context.drawImage(this.image, this.x-228, this.y-228);
// If the image is being rendered do not draw the circle so break out of the draw function
return;
}
// Draw the circle as before, with the addition of using the position and the radius from this object.
};
// Update the particle.
this.update = function() {
// Update the position of the particle with the addition of the velocity.
this.x += this.xVelocity;
this.y += this.yVelocity;
// Check if has crossed the right edge
if (this.x >= canvasWidth) {
this.xVelocity = -this.xVelocity;
this.x = canvasWidth;
}
// Check if has crossed the left edge
else if (this.x <= 0) {
this.xVelocity = -this.xVelocity;
this.x = 0;
}
// Check if has crossed the bottom edge
if (this.y >= canvasHeight) {
this.yVelocity = -this.yVelocity;
this.y = canvasHeight;
}
// Check if has crossed the top edge
else if (this.y <= 0) {
this.yVelocity = -this.yVelocity;
this.y = 0;
}
};
// A function to set the position of the particle.
this.setPosition = function(x, y) {
this.x = x;
this.y = y;
};
// Function to set the velocity.
this.setVelocity = function(x, y) {
this.xVelocity = x;
this.yVelocity = y;
};
this.setImage = function(image){
this.image = image;
}
}
// A function to generate a random number between 2 values
function generateRandom(min, max){
return Math.random() * (max - min) + min;
}
// The canvas context if it is defined.
var context;
// Initialise the scene and set the context if possible
function init() {
var canvas = document.getElementById('myCanvas');
if (canvas.getContext) {
// Set the context variable so it can be re-used
context = canvas.getContext('2d');
// Create the particles and set their initial positions and velocities
for(var i=0; i < particleCount; ++i){
var particle = new Particle(context);
// Set the position to be inside the canvas bounds
particle.setPosition(generateRandom(0, canvasWidth), generateRandom(0, canvasHeight));
// Set the initial velocity to be either random and either negative or positive
particle.setVelocity(generateRandom(-maxVelocity, maxVelocity), generateRandom(-maxVelocity, maxVelocity));
particles.push(particle);
}
}
else {
alert("Please use a modern browser");
}
}
// The function to draw the scene
function draw() {
// Clear the drawing surface and fill it with a black background
//context.fillStyle = "rgba(0, 0, 0, 0.5)";
//context.fillRect(0, 0, 400, 400);
context.clearRect(0,0,1014,611);
// Go through all of the particles and draw them.
particles.forEach(function(particle) {
particle.draw();
});
}
// Update the scene
function update() {
particles.forEach(function(particle) {
particle.update();
});
}
// Initialize the scene
init();
// If the context is set then we can draw the scene (if not then the browser does not support canvas)
if (context) {
setInterval(function() {
// Update the scene befoe drawing
update();
// Draw the scene
draw();
}, 1000 / targetFPS);
}
var deg = [0, 0, 0, 0];
rotate = function() {
for (var i = 0; i < 3; ++i) {
deg[i] += 180 * 3;
if (Math.random() > 8)
deg[i] += 180;
$('#flip' + i).css({
'-webkit-transform': 'rotateY(' + deg[i] + 'deg)',
'-o-transform': 'rotateY(' + deg[i] + 'deg)',
'transform': 'rotateY(' + deg[i] + 'deg)'
});
}
};
rotate();
setInterval(rotate, 8000);.animateVSS{
width:282px;
height:283px;
position:relative;
margin-top:20px;
margin-left:100px;
}
.vsslogocover{
position:absolute;
z-index:2;
}
.blackdrop{
position:relative;
top:-189px;
margin-left:44px;
opacity:0;
}
#myCanvas{
position:relative;
background:black;
position:absolute;
z-index;4;
margin-top:-190px;
margin-left:-190px;
border-radius:100%;
}
.coin {
background-image: url("http://portalpacific.net/jsfid/vss-animated-front-logo1.png");
background-size: 100% 100%;
border-radius: 100%;
height: 182px;
position: relative;
width:185px;
-webkit-transition: 1.8s ease-in-out;
-o-transition: 1.8s ease-in-out;
transition: 1.8s ease-in-out;
-webkit-transform-style: preserve-3d;
-o-transform-style: preserve-3d;
transform-style: preserve-3d;
margin-top:50px;
margin-left:48px;
z-index:1;
background-color: black;
}
.coin:before {
background-color: black;
background-image: url("http://portalpacific.net/jsfid/vss22-animated-back-logo-185x1821.png");
background-size: 100% 100%;
content: '';
height: 182px;
left: 0;
position: absolute;
top: 0;
width: 185px;
margin-top:1px;
-webkit-transform: translateZ(-5px);
-o-transform: translateZ(-5px);
transform: translateZ(-5px);
border-radius:100%;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<div class="animateVSS">
<img class="vsslogocover" src="http://portalpacific.net/jsfid/VSS%20Bazooka%20Logo%20animation%20cover%20logo%20border.png" alt="Smiley face" width="282" height="283">
<span id="flip0" class="coin" style="display:inline-block;"></span>
<img class="blackdrop" src="http://portalpacific.net/jsfid/bg2.png" alt="Smiley face" width="192" height="192">
<canvas id="myCanvas" width="200" height="200"></canvas>
</div>这里还有一个JSFiddle。
感谢您的帮助！
【问题讨论】：
-
css 动画不是一个选项吗？ ://
标签： javascript jquery html css animation