javascript - 如何使我的 Logo JS 动画像网站上的图像 Logo 一样缩放？

Question

我花了很多时间在我的网站上制作了这个非常酷的 Logo 动画!我制作的 Logo 动画与 Logo 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 Logo 设置为在屏幕宽度达到特定点后开始缩小。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......我意识到我需要在将我的 Logo 动画应用到我的网站之前弄清楚这一点。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，因为那样会很麻烦。

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>

这是一个 JSFiddle还有。

感谢您的帮助!

Answer 1

代码已更新。 它使用 Canvas 效果并且响应迅速，还使用 ​​css3 动画。我试图让动画在动画的开始和结束时同时显示硬币的正面和背面:) 干杯!

https://jsfiddle.net/BenjaminGraham/rudngfq9/

// 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;
}

.vsslogocover {
  position: absolute;
  z-index: 2;
}

.blackdrop {
  position: relative;
  opacity: 0;
}

#myCanvas {
  position: absolute;
  background: black;
  z-index;
  4;
  top: 17.5%;
  left: 17.5%;
  bottom: 0;
  border-radius: 100%;
}

.coin {
  background-image: url("http://portalpacific.net/jsfid/vss-animated-front-logo1.png");
  background-size: 100% 100%;
  border-radius: 100%;
  height: 65%;
  width: 65%;
  top: 17.5%;
  left: 17.5%;
  position: relative;
  -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;
  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: 100%;
  width: 100%;
  left: 0%;
  position: absolute;
  top: 0%;
  -webkit-transform: translateZ(-5px);
  -o-transform: translateZ(-5px);
  transform: translateZ(-5px);
  border-radius: 100%;
}

#flip0 {
  -webkit-animation-name: Logo;
  animation-name: Logo;
  -webkit-animation-duration: 5s;
  animation-duration: 5s;
  -webkit-animation-iteration-count: infinite;
  /* Safari 4.0 - 8.0 */
  animation-iteration-count: infinite;
}

@keyframes Logo {
  0% {
    transform: rotateY(0deg);
    -webkit-transform: rotateY(0deg);
  }  
  25% {
    transform: rotateY(0deg);
    -webkit-transform: rotateY(0deg);
  }
  50% {
    transform: rotateY(900deg);
    -webkit-transform: rotateY(900deg);
  }  
    75% {
    transform: rotateY(900deg);
    -webkit-transform: rotateY(900deg);
  }
  100% {
    transform: rotateY(0deg);
    -webkit-transform: rotateY(0deg);
  }
}

@media screen and (max-width:767px) {
  .animateVSS {
    width: 180px;
    height: 180px;
  }
}

@media screen and (min-width:768px) {
  .animateVSS {
    width: 280px;
    height: 280px;
  }
  #myCanvas {
    width: 180px;
    height: 180px;
    top: 17.5%;
    left: 17.5%;
  }
}

<div class="animateVSS">
  <img class="vsslogocover" src="http://portalpacific.net/jsfid/VSS%20Bazooka%20Logo%20animation%20cover%20logo%20border.png" alt="Smiley face" width="100%" height="100%">
  <span id="flip0" class="coin" style="display:inline-block;">
  </span>
  <img class="blackdrop" src="http://portalpacific.net/jsfid/bg2.png" alt="Smiley face" width="100%" height="100%">
  <canvas id="myCanvas" width="120%" height="120%"></canvas>
</div>