HTML5 Canvas 梦幻的文字飞扬动画教程
阅读：2601
时间：2018-02-01 03:25
之前为大家介绍了一款HTML5/CSS3 3D文字特效 文字外翻效果。今天为大家带来的是html5 canvas实现的文字漂动动画效果。画面非常梦幻。
实现代码如下：
html代码：
<div class="dg ac">
<div class="dg main a taller-than-window" style="width: 245px;">
<div style="width: 6px; margin-left: -3px; height: 42px; cursor: ew-resize; position: absolute;">
</div>
<ul style="height: 42px;">
<li class="cr string">
<div>
<span class="property-name">text</span><div class="c">
<input type="text"></div>
</div>
</li>
<li class="cr number has-slider">
<div>
<span class="property-name">speed</span><div class="c">
<div>
<input type="text"></div>
<div class="slider">
<div class="slider-fg" style="width: 14.089754445385266%;">
</div>
</div>
</div>
</div>
</li>
<li class="cr number has-slider">
<div>
<span class="property-name">spacing</span><div class="c">
<div>
<input type="text"></div>
<div class="slider">
<div class="slider-fg" style="width: 86.70618120237087%;">
</div>
</div>
</div>
</div>
</li>
<li class="cr number has-slider">
<div>
<span class="property-name">waviness</span><div class="c">
<div>
<input type="text"></div>
<div class="slider">
<div class="slider-fg" style="width: 56.35901778154106%;">
</div>
</div>
</div>
</div>
</li>
<li class="cr number has-slider">
<div>
<span class="property-name">trail</span><div class="c">
<div>
<input type="text"></div>
<div class="slider">
<div class="slider-fg" style="width: 9.67741935483871%;">
</div>
</div>
</div>
</div>
</li>
<li class="cr boolean">
<div>
<span class="property-name">multiply_trail</span><div class="c">
<input type="checkbox"></div>
</div>
</li>
</ul>
<div class="close-button" style="width: 245px;">
Close Controls</div>
</div>
</div>
css代码：
.dg ul
{
list-style: none;
margin: 0;
padding: 0;
width: 100%;
clear: both;
}
.dg.ac
{
position: fixed;
top: 0;
left: 0;
right: 0;
height: 0;
z-index: 0;
}
.dg:not(.ac) .main
{
overflow: hidden;
}
.dg.main
{
-webkit-transition: opacity 0.1s linear;
-o-transition: opacity 0.1s linear;
-moz-transition: opacity 0.1s linear;
transition: opacity 0.1s linear;
}
.dg.main.taller-than-window
{
overflow-y: auto;
}
.dg.main.taller-than-window .close-button
{
opacity: 1;
margin-top: -1px;
border-top: 1px solid #2c2c2c;
}
.dg.main ul.closed .close-button
{
opacity: 1 !important;
}
.dg.main:hover .close-button, .dg.main .close-button.drag
{
opacity: 1;
}
.dg.main .close-button
{
-webkit-transition: opacity 0.1s linear;
-o-transition: opacity 0.1s linear;
-moz-transition: opacity 0.1s linear;
transition: opacity 0.1s linear;
border: 0;
position: absolute;
line-height: 19px;
height: 20px;
cursor: pointer;
text-align: center;
background-color: #000;
}
.dg.main .close-button:hover
{
background-color: #111;
}
.dg.a
{
float: right;
margin-right: 15px;
overflow-x: hidden;
}
.dg.a.has-save ul
{
margin-top: 27px;
}
.dg.a.has-save ul.closed
{
margin-top: 0;
}
.dg.a .save-row
{
position: fixed;
top: 0;
z-index: 1002;
}
.dg li
{
-webkit-transition: height 0.1s ease-out;
-o-transition: height 0.1s ease-out;
-moz-transition: height 0.1s ease-out;
transition: height 0.1s ease-out;
}
.dg li:not(.folder)
{
cursor: auto;
height: 27px;
line-height: 27px;
overflow: hidden;
padding: 0 4px 0 5px;
}
.dg li.folder
{
padding: 0;
border-left: 4px solid rgba(0,0,0,0);
}
.dg li.title
{
cursor: pointer;
margin-left: -4px;
}
.dg .closed li:not(.title), .dg .closed ul li, .dg .closed ul li > *
{
height: 0;
overflow: hidden;
border: 0;
}
.dg .cr
{
clear: both;
padding-left: 3px;
height: 27px;
}
.dg .property-name
{
cursor: default;
float: left;
clear: left;
width: 40%;
overflow: hidden;
text-overflow: ellipsis;
}
.dg .c
{
float: left;
width: 60%;
}
.dg .c input[type=text]
{
border: 0;
margin-top: 4px;
padding: 3px;
width: 100%;
float: right;
}
.dg .has-slider input[type=text]
{
width: 30%;
margin-left: 0;
}
.dg .slider
{
float: left;
width: 66%;
margin-left: -5px;
margin-right: 0;
height: 19px;
margin-top: 4px;
}
.dg .slider-fg
{
height: 100%;
}
.dg .c input[type=checkbox]
{
margin-top: 9px;
}
.dg .c select
{
margin-top: 5px;
}
.dg .cr.function, .dg .cr.function .property-name, .dg .cr.function *, .dg .cr.boolean, .dg .cr.boolean *
{
cursor: pointer;
}
.dg .selector
{
display: none;
position: absolute;
margin-left: -9px;
margin-top: 23px;
z-index: 10;
}
.dg .c:hover .selector, .dg .selector.drag
{
display: block;
}
.dg li.save-row
{
padding: 0;
}
.dg li.save-row .button
{
display: inline-block;
padding: 0px 6px;
}
.dg.dialogue
{
background-color: #222;
width: 460px;
padding: 15px;
font-size: 13px;
line-height: 15px;
}
#dg-new-constructor
{
padding: 10px;
color: #222;
font-family: Monaco, monospace;
font-size: 10px;
border: 0;
resize: none;
box-shadow: inset 1px 1px 1px #888;
word-wrap: break-word;
margin: 12px 0;
display: block;
width: 440px;
overflow-y: scroll;
height: 100px;
position: relative;
}
#dg-local-explain
{
display: none;
font-size: 11px;
line-height: 17px;
border-radius: 3px;
background-color: #333;
padding: 8px;
margin-top: 10px;
}
#dg-local-explain code
{
font-size: 10px;
}
#dat-gui-save-locally
{
display: none;
}
.dg
{
color: #eee;
font: 11px 'Lucida Grande' , sans-serif;
text-shadow: 0 -1px 0 #111;
}
.dg.main::-webkit-scrollbar
{
width: 5px;
background: #1a1a1a;
}
.dg.main::-webkit-scrollbar-corner
{
height: 0;
display: none;
}
.dg.main::-webkit-scrollbar-thumb
{
border-radius: 5px;
background: #676767;
}
.dg li:not(.folder)
{
background: #1a1a1a;
border-bottom: 1px solid #2c2c2c;
}
.dg li.save-row
{
line-height: 25px;
background: #dad5cb;
border: 0;
}
.dg li.save-row select
{
margin-left: 5px;
width: 108px;
}
.dg li.save-row .button
{
margin-left: 5px;
margin-top: 1px;
border-radius: 2px;
font-size: 9px;
line-height: 7px;
padding: 4px 4px 5px 4px;
background: #c5bdad;
color: #fff;
text-shadow: 0 1px 0 #b0a58f;
box-shadow: 0 -1px 0 #b0a58f;
cursor: pointer;
}
.dg li.save-row .button.gears
{
background: #c5bdad url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAsAAAANCAYAAAB/9ZQ7AAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAQJJREFUeNpiYKAU/P//PwGIC/ApCABiBSAW+I8AClAcgKxQ4T9hoMAEUrxx2QSGN6+egDX+/vWT4e7N82AMYoPAx/evwWoYoSYbACX2s7KxCxzcsezDh3evFoDEBYTEEqycggWAzA9AuUSQQgeYPa9fPv6/YWm/Acx5IPb7ty/fw+QZblw67vDs8R0YHyQhgObx+yAJkBqmG5dPPDh1aPOGR/eugW0G4vlIoTIfyFcA+QekhhHJhPdQxbiAIguMBTQZrPD7108M6roWYDFQiIAAv6Aow/1bFwXgis+f2LUAynwoIaNcz8XNx3Dl7MEJUDGQpx9gtQ8YCueB+D26OECAAQDadt7e46D42QAAAABJRU5ErkJggg==) 2px 1px no-repeat;
height: 7px;
width: 8px;
}
.dg li.save-row .button:hover
{
background-color: #bab19e;
box-shadow: 0 -1px 0 #b0a58f;
}
.dg li.folder
{
border-bottom: 0;
}
.dg li.title
{
padding-left: 16px;
background: #000 url(data:image/gif;base64,R0lGODlhBQAFAJEAAP////Pz8////////yH5BAEAAAIALAAAAAAFAAUAAAIIlI+hKgFxoCgAOw==) 6px 10px no-repeat;
cursor: pointer;
border-bottom: 1px solid rgba(255,255,255,0.2);
}
.dg .closed li.title
{
background-image: url(data:image/gif;base64,R0lGODlhBQAFAJEAAP////Pz8////////yH5BAEAAAIALAAAAAAFAAUAAAIIlGIWqMCbWAEAOw==);
}
.dg .cr.boolean
{
border-left: 3px solid #806787;
}
.dg .cr.function
{
border-left: 3px solid #e61d5f;
}
.dg .cr.number
{
border-left: 3px solid #2fa1d6;
}
.dg .cr.number input[type=text]
{
color: #2fa1d6;
}
.dg .cr.string
{
border-left: 3px solid #1ed36f;
}
.dg .cr.string input[type=text]
{
color: #1ed36f;
}
.dg .cr.function:hover, .dg .cr.boolean:hover
{
background: #111;
}
.dg .c input[type=text]
{
background: #303030;
outline: none;
}
.dg .c input[type=text]:hover
{
background: #3c3c3c;
}
.dg .c input[type=text]:focus
{
background: #494949;
color: #fff;
}
.dg .c .slider
{
background: #303030;
cursor: ew-resize;
}
.dg .c .slider-fg
{
background: #2fa1d6;
}
.dg .c .slider:hover
{
background: #3c3c3c;
}
.dg .c .slider:hover .slider-fg
{
background: #44abda;
}
js代码：
var settings = {
text: "CANVAS TIME!",
waviness: 3,
spacing: 5,
speed: 16,
trail: 4,
multiply_trail: false
};
var viewWidth = 1024;
var viewHeight = 512;
var drawingCanvas, ctx;
var timeStep = (1 / 16);
var time = 0;
var frame = 0;
var measureDiv = document.getElementById('text-measure');
var totalTextWidth = 0;
var letters = [];
var bgColor1 = '#FFF0A5',
bgColor2 = '#FFB03B',
letterFillColor1 = '#B64926',
letterFillColor2 = '#8E2800',
letterStrokeColor = '#DE0017';
var textFillPattern = createPattern(bgColor1, bgColor2);
var backgroundFillPattern = createPattern(letterFillColor1, letterFillColor2);
var Letter = function (v) {
measureDiv.innerHTML = v;
this.width = measureDiv.clientWidth;
this.height = measureDiv.clientHeight;
this.value = v;
this.x = 0;
this.y = 0;
var history = [];
this.draw = function () {
if (settings.multiply_trail) {
ctx.globalCompositeOperation = 'multiply';
}
for (var i = 0; i < history.length; i++) {
ctx.strokeText(this.value, history[i].x, history[i].y);
}
ctx.strokeText(this.value, this.x, this.y);
ctx.globalCompositeOperation = 'source-over'; // this is the default
ctx.fillText(this.value, this.x, this.y);
history.unshift({ x: this.x, y: this.y });
if (history.length > settings.trail) history.length = settings.trail;
}
}
initGui();
initDrawingCanvas();
processText();
requestAnimationFrame(loop);
function initGui() {
var gui = new dat.GUI();
gui.add(settings, 'text').onChange(processText);
gui.add(settings, 'speed', 1, 60).onChange(function () { timeStep = 1 / (61 - settings.speed) });
gui.add(settings, 'spacing', 0, 10);
gui.add(settings, 'waviness', 1, 16);
gui.add(settings, 'trail', 1, 32).step(1);
gui.add(settings, 'multiply_trail');
}
function initDrawingCanvas() {
drawingCanvas = document.getElementById("drawing_canvas");
drawingCanvas.width = viewWidth;
drawingCanvas.height = viewHeight;
ctx = drawingCanvas.getContext('2d');
ctx.font = 'bolder 120px Arial';
ctx.lineJoin = 'round';
}
function processText() {
letters.length = 0;
totalTextWidth = 0;
for (var i = 0; i < settings.text.length; i++) {
letters.push(new Letter(settings.text[i]));
totalTextWidth += letters[i].width;
}
}
function createPattern(c1, c2) {
var patternCanvas = document.getElementById('pattern_canvas');
var w = patternCanvas.width = 256;
var h = patternCanvas.height = 256;
var hw = w * 0.5;
var hh = h * 0.5;
var c = patternCanvas.getContext('2d');
// background color
c.fillStyle = c1;
c.fillRect(0, 0, w, h);
// the 'v' shape
c.fillStyle = c2;
c.beginPath();
c.moveTo(0, 0);
c.lineTo(hw, hh);
c.lineTo(w, 0);
c.lineTo(w, hh);
c.lineTo(hw, h);
c.lineTo(0, hh);
c.closePath();
c.fill();
return c.createPattern(patternCanvas, 'repeat');
}
function loop() {
draw();
time += timeStep;
frame++;
requestAnimationFrame(loop);
}
function draw() {
ctx.fillStyle = backgroundFillPattern;
ctx.fillRect(0, 0, viewWidth, viewHeight);
if (letters.length === 0) return;
ctx.strokeStyle = letterStrokeColor;
ctx.lineWidth = 16;
ctx.fillStyle = textFillPattern;
var letter,
margin = settings.spacing,
x = (viewWidth - (totalTextWidth + margin * (settings.text.length - 1))) * 0.5,
y = viewHeight * 0.5 + letters[0].height * 0.25,
d = settings.waviness / letters.length;
for (var i = 0; i < letters.length; i++) {
letter = letters[i];
letter.x = x + Math.cos(time + i * d) * 64;
letter.y = y + Math.sin(time + i * d) * 184;
letter.draw();
x += letter.width + margin;
}
} //@ sourceURL=pen.js
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