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者：前端Q
轉發鏈接：https://mp.weixin.qq.com/s/ewFfXptccFs5KvjUINLGbQ
小試牛刀，實現了六款簡單常見HTML5 Canvas特效濾鏡，并且封裝成一個純JavaScript可調用的API文件gloomyfishfilter.js。支持的特效濾鏡分別為：
1.反色
2.灰色調
3.模糊
4.浮雕
5.雕刻
6.合理
2.灰色調：獲取一個預期點RGB值r，g，b則新的RGB值
newr =（r * 0.272）+（g * 0.534）+（b * 0.131）;
newg =（r * 0.349）+（g * 0.686）+（b * 0.168）;
newb =（r * 0.393）+（g * 0.769）+（b * 0.189）;
3.模糊：基于一個5 * 5的卷積核
4.浮雕與雕刻：
根據當前預期的前一個預期RGB值與它的后一個重新的RGB值之差再加上128
5.總體：模擬了物體在鏡子中與之對應的效果。
var canvas = document.getElementById("target");
canvas.width = source.clientWidth;
canvas.height = source.clientHeight;
**if**(!canvas.getContext) {
console.log("Canvas not supported. Please install a HTML5compatible browser.");
**return**;
}
// get 2D context of canvas and draw image
tempContext = canvas.getContext("2d");var source = document.getElementById("source");
tempContext.drawImage(source, 0, 0, canvas.width,canvas.height);var canvas = document.getElementById("target");
var len = canvas.width * canvas.height * 4;
var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
var binaryData = canvasData.data;function bindButtonEvent(element, type, handler)
{
if(element.addEventListener){
element.addEventListener(type, handler,**false**);
}else{
element.attachEvent('on'+type, handler);// for IE6,7,8
}
}<scriptsrc=*"gloomyfishfilter.js"*></script> //導入API文件
gfilter.colorInvertProcess(binaryData, len); //調用 API<meta http-equiv="X-UA-Compatible"*content=*"chrome=IE8"> 效果演示：
CSS部分：
#svgContainer {
width:800px;
height:600px;
background-color:#EEEEEE;
}
#sourceDiv { float: left; border: 2px solid blue}
#targetDiv { float: right;border: 2px solid red}filter1.html中HTML源代碼：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="chrome=IE8">
<meta http-equiv="Content-type" content="text/html;charset=UTF-8">
<title>Canvas Filter Demo</title>
<link href="default.css" rel="stylesheet" />
<script src="gloomyfishfilter.js"></scrip>
</head>
<body>
<h1>HTML Canvas Image Process - By Gloomy Fish</h1>
<div id="svgContainer">
<div id="sourceDiv">
<img id="source" src="../test.png" />
</div>
<div id="targetDiv">
<canvas id="target"></canvas>
</div>
</div>
<div id="btn-group">
<button type="button" id="invert-button">反色</button>
<button type="button" id="adjust-button">灰色調</button>
<button type="button" id="blur-button">模糊</button>
<button type="button" id="relief-button">浮雕</button>
<button type="button" id="diaoke-button">雕刻</button>
<button type="button" id="mirror-button">鏡像</button>
</div>
</body>
</html>filter1.html中JavaScript源代碼：
var tempContext = null; // global variable 2d context
window.onload = function() {
var source = document.getElementById("source");
var canvas = document.getElementById("target");
canvas.width = source.clientWidth;
canvas.height = source.clientHeight;
if (!canvas.getContext) {
console.log("Canvas not supported. Please install a HTML5 compatible browser.");
return;
}
// get 2D context of canvas and draw image
tempContext = canvas.getContext("2d");
tempContext.drawImage(source, 0, 0, canvas.width, canvas.height);
// initialization actions
var inButton = document.getElementById("invert-button");
var adButton = document.getElementById("adjust-button");
var blurButton = document.getElementById("blur-button");
var reButton = document.getElementById("relief-button");
var dkButton = document.getElementById("diaoke-button");
var mirrorButton = document.getElementById("mirror-button");
// bind mouse click event
bindButtonEvent(inButton, "click", invertColor);
bindButtonEvent(adButton, "click", adjustColor);
bindButtonEvent(blurButton, "click", blurImage);
bindButtonEvent(reButton, "click", fudiaoImage);
bindButtonEvent(dkButton, "click", kediaoImage);
bindButtonEvent(mirrorButton, "click", mirrorImage);
}
function bindButtonEvent(element, type, handler)
{
if(element.addEventListener) {
element.addEventListener(type, handler, false);
} else {
element.attachEvent('on'+type, handler); // for IE6,7,8
}
}
function invertColor() {
var canvas = document.getElementById("target");
var len = canvas.width * canvas.height * 4;
var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
var binaryData = canvasData.data;
// Processing all the pixels
gfilter.colorInvertProcess(binaryData, len);
// Copying back canvas data to canvas
tempContext.putImageData(canvasData, 0, 0);
}
function adjustColor() {
var canvas = document.getElementById("target");
var len = canvas.width * canvas.height * 4;
var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
var binaryData = canvasData.data;
// Processing all the pixels
gfilter.colorAdjustProcess(binaryData, len);
// Copying back canvas data to canvas
tempContext.putImageData(canvasData, 0, 0);
}
function blurImage()
{
var canvas = document.getElementById("target");
var len = canvas.width * canvas.height * 4;
var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
// Processing all the pixels
gfilter.blurProcess(tempContext, canvasData);
// Copying back canvas data to canvas
tempContext.putImageData(canvasData, 0, 0);
}
function fudiaoImage()
{
var canvas = document.getElementById("target");
var len = canvas.width * canvas.height * 4;
var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
// Processing all the pixels
gfilter.reliefProcess(tempContext, canvasData);
// Copying back canvas data to canvas
tempContext.putImageData(canvasData, 0, 0);
}
function kediaoImage()
{
var canvas = document.getElementById("target");
var len = canvas.width * canvas.height * 4;
var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
// Processing all the pixels
gfilter.diaokeProcess(tempContext, canvasData);
// Copying back canvas data to canvas
tempContext.putImageData(canvasData, 0, 0);
}
function mirrorImage()
{
var canvas = document.getElementById("target");
var len = canvas.width * canvas.height * 4;
var canvasData = tempContext.getImageData(0, 0, canvas.width, canvas.height);
// Processing all the pixels
gfilter.mirrorProcess(tempContext, canvasData);
// Copying back canvas data to canvas
tempContext.putImageData(canvasData, 0, 0);
}濾鏡源代碼（gloomyfishfilter.js）：
var gfilter = {
type: "canvas",
name: "filters",
author: "zhigang",
getInfo: function () {
return this.author + ' ' + this.type + ' ' + this.name;
},
/**
* invert color value of pixel, new pixel = RGB(255-r, 255-g, 255 - b)
*
* @param binaryData - canvas's imagedata.data
* @param l - length of data (width * height of image data)
*/
colorInvertProcess: function(binaryData, l) {
for (var i = 0; i < l; i += 4) {
var r = binaryData[i];
var g = binaryData[i + 1];
var b = binaryData[i + 2];
binaryData[i] = 255-r;
binaryData[i + 1] = 255-g;
binaryData[i + 2] = 255-b;
}
},
/**
* adjust color values and make it more darker and gray...
*
* @param binaryData
* @param l
*/
colorAdjustProcess: function(binaryData, l) {
for (var i = 0; i < l; i += 4) {
var r = binaryData[i];
var g = binaryData[i + 1];
var b = binaryData[i + 2];
binaryData[i] = (r * 0.272) + (g * 0.534) + (b * 0.131);
binaryData[i + 1] = (r * 0.349) + (g * 0.686) + (b * 0.168);
binaryData[i + 2] = (r * 0.393) + (g * 0.769) + (b * 0.189);
}
},
/**
* deep clone image data of canvas
*
* @param context
* @param src
* @returns
*/
copyImageData: function(context, src)
{
var dst = context.createImageData(src.width, src.height);
dst.data.set(src.data);
return dst;
},
/**
* convolution - keneral size 5*5 - blur effect filter(模糊效果)
*
* @param context
* @param canvasData
*/
blurProcess: function(context, canvasData) {
console.log("Canvas Filter - blur process");
var tempCanvasData = this.copyImageData(context, canvasData);
var sumred = 0.0, sumgreen = 0.0, sumblue = 0.0;
for ( var x = 0; x < tempCanvasData.width; x++) {
for ( var y = 0; y < tempCanvasData.height; y++) {
// Index of the pixel in the array
var idx = (x + y * tempCanvasData.width) * 4;
for(var subCol=-2; subCol<=2; subCol++) {
var colOff = subCol + x;
if(colOff <0 || colOff >= tempCanvasData.width) {
colOff = 0;
}
for(var subRow=-2; subRow<=2; subRow++) {
var rowOff = subRow + y;
if(rowOff < 0 || rowOff >= tempCanvasData.height) {
rowOff = 0;
}
var idx2 = (colOff + rowOff * tempCanvasData.width) * 4;
var r = tempCanvasData.data[idx2 + 0];
var g = tempCanvasData.data[idx2 + 1];
var b = tempCanvasData.data[idx2 + 2];
sumred += r;
sumgreen += g;
sumblue += b;
}
}
// calculate new RGB value
var nr = (sumred / 25.0);
var ng = (sumgreen / 25.0);
var nb = (sumblue / 25.0);
// clear previous for next pixel point
sumred = 0.0;
sumgreen = 0.0;
sumblue = 0.0;
// assign new pixel value
canvasData.data[idx + 0] = nr; // Red channel
canvasData.data[idx + 1] = ng; // Green channel
canvasData.data[idx + 2] = nb; // Blue channel
canvasData.data[idx + 3] = 255; // Alpha channel
}
}
},
/**
* after pixel value - before pixel value + 128
* 浮雕效果
*/
reliefProcess: function(context, canvasData) {
console.log("Canvas Filter - relief process");
var tempCanvasData = this.copyImageData(context, canvasData);
for ( var x = 1; x < tempCanvasData.width-1; x++)
{
for ( var y = 1; y < tempCanvasData.height-1; y++)
{
// Index of the pixel in the array
var idx = (x + y * tempCanvasData.width) * 4;
var bidx = ((x-1) + y * tempCanvasData.width) * 4;
var aidx = ((x+1) + y * tempCanvasData.width) * 4;
// calculate new RGB value
var nr = tempCanvasData.data[aidx + 0] - tempCanvasData.data[bidx + 0] + 128;
var ng = tempCanvasData.data[aidx + 1] - tempCanvasData.data[bidx + 1] + 128;
var nb = tempCanvasData.data[aidx + 2] - tempCanvasData.data[bidx + 2] + 128;
nr = (nr < 0) ? 0 : ((nr >255) ? 255 : nr);
ng = (ng < 0) ? 0 : ((ng >255) ? 255 : ng);
nb = (nb < 0) ? 0 : ((nb >255) ? 255 : nb);
// assign new pixel value
canvasData.data[idx + 0] = nr; // Red channel
canvasData.data[idx + 1] = ng; // Green channel
canvasData.data[idx + 2] = nb; // Blue channel
canvasData.data[idx + 3] = 255; // Alpha channel
}
}
},
/**
* before pixel value - after pixel value + 128
* 雕刻效果
*
* @param canvasData
*/
diaokeProcess: function(context, canvasData) {
console.log("Canvas Filter - process");
var tempCanvasData = this.copyImageData(context, canvasData);
for ( var x = 1; x < tempCanvasData.width-1; x++)
{
for ( var y = 1; y < tempCanvasData.height-1; y++)
{
// Index of the pixel in the array
var idx = (x + y * tempCanvasData.width) * 4;
var bidx = ((x-1) + y * tempCanvasData.width) * 4;
var aidx = ((x+1) + y * tempCanvasData.width) * 4;
// calculate new RGB value
var nr = tempCanvasData.data[bidx + 0] - tempCanvasData.data[aidx + 0] + 128;
var ng = tempCanvasData.data[bidx + 1] - tempCanvasData.data[aidx + 1] + 128;
var nb = tempCanvasData.data[bidx + 2] - tempCanvasData.data[aidx + 2] + 128;
nr = (nr < 0) ? 0 : ((nr >255) ? 255 : nr);
ng = (ng < 0) ? 0 : ((ng >255) ? 255 : ng);
nb = (nb < 0) ? 0 : ((nb >255) ? 255 : nb);
// assign new pixel value
canvasData.data[idx + 0] = nr; // Red channel
canvasData.data[idx + 1] = ng; // Green channel
canvasData.data[idx + 2] = nb; // Blue channel
canvasData.data[idx + 3] = 255; // Alpha channel
}
}
},
/**
* mirror reflect
*
* @param context
* @param canvasData
*/
mirrorProcess : function(context, canvasData) {
console.log("Canvas Filter - process");
var tempCanvasData = this.copyImageData(context, canvasData);
for ( var x = 0; x < tempCanvasData.width; x++) // column
{
for ( var y = 0; y < tempCanvasData.height; y++) // row
{
// Index of the pixel in the array
var idx = (x + y * tempCanvasData.width) * 4;
var midx = (((tempCanvasData.width -1) - x) + y * tempCanvasData.width) * 4;
// assign new pixel value
canvasData.data[midx + 0] = tempCanvasData.data[idx + 0]; // Red channel
canvasData.data[midx + 1] = tempCanvasData.data[idx + 1]; ; // Green channel
canvasData.data[midx + 2] = tempCanvasData.data[idx + 2]; ; // Blue channel
canvasData.data[midx + 3] = 255; // Alpha channel
}
}
},
};感謝閱讀，如果你覺得我今天分享的內容，不錯，請點一個贊，謝謝??！
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就愛UI - 分享UI設計的點點滴滴
起程序員，外行的人對程序員古板的印象是格子衫、雙肩包、黑眼睛框、不懂浪漫的指南。但實際上，程序員也是很浪費的！
七夕馬上到了，我整理了一些程序員七夕表白代碼，總共有40款。計劃告別的同學收藏起來了（文末下載）。
我們一起看下其中幾個，更多請下載查看。
01 滿滿愛心
02 相冊動畫
03 戀愛日志
04 戀愛PPT
05 表白書信
05 煙花特效
表白的套路很多，但都少不了送花送禮物，作為一個程序員，搞不懂現在流行的泡泡機、小豬、重力感應車等玩具，也不想去讓朋友們去送錢炫耀，畢竟真情才重要，錢就物質了。我能給各位單身粉絲們做的可能就只有分享幾個表白代碼了，在電腦上敲上幾行代碼，讓她在郁悶的周一得到一個大大的驚喜，很簡單，一看就會，如果現在用不到也不要緊，先收藏起來，反正這樣的節日很多，以后用的時候能找到。
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