java 教你如何给你的头像添加一个好看的国旗

java 教你如何给你的头像添加一个好看的国旗

今天朋友圈又火了，听说原因是 @腾讯官网 就能得到一顶绿色的帽子，啊呸，是一个好看的国庆节头像，可是听说没一会就502了，那么我们自己动手实现一个吧

由于代码比较简单就不一一介绍了。

var cvs = document.getElementById("cvs");

var ctx = cvs.getContext("2d");

var exportImage = document.getElementById("export");

var img = document.getElementById("img");

var hat = "hat6";

var canvasFabric;

var hatInstance;

varhttp:// screenWidth = window.screen.width < 500 ? window.screen.width : 300;

function viewer() {

var file = document.getElementById("upload").files[0];

console.log(file);

var reader = new FileReader;

if (file) {

reader.readAsDataURL(file);

reader.onload = function(e) {

img.src = reader.result;

img.onload = function() {

img2Cvs(img)

}

}

} else {

img.src = ""

}

}

function img2Cvs(img) {

cvs.width = img.width;

cvs.height = img.height;

cvs.style.display = "block";

canvasFabric = new fabric.Canvas("cvs", {

width: screenWidth,

height: screenWidth,

backgroundImage: new fabric.Image(img, {

scaleX: screenWidth / img.width,

scaleY: screenWidth / img.height

})

});

changeHat();

document.getElementById("uploadContainer").style.display = "none";

document.getElementById("uploadText").style.display = "none";

document.getElementById("upload").style.display = "none";

document.getElementById("change").style.display = "block";

document.getElementById("exportBtn").style.display = "block";

document.getElementById("tip").style.opacity = 1

}

function changeHat() {

document.getElementById(hat).style.display = "none";

var hats = document.getElementsByClassName("hide");

hat = "hat" + (+hat.replace("hat", "") + 1) % hats.length;

var hatImage = document.getElementById(hat);

hatImage.style.display = "block";

if (hatInstance) {

canvasFabric.remove(hatInstance)

}

hatInstance = new fabric.Image(hatImage, {

top: 40,

left: screenWidth / 3,

scaleX: 100 / hatImage.width,

scaleY: 100 / hatImage.height,

cornerColor: "#0b3a42",

cornerStrokeColor: "#fff",

cornerStylehttp://: "circle",

transparentCorners: false,

rotatingPointOffset: 30

});

hatInstance.setControlVisible("bl", false);

hatInstance.setControlVisible("tr", false);

hatInstance.setControlVisible("tl", false);

hatInstance.setControlVisible("mr", false);

hatInstance.setControlVisible("mt", false);

canvasFabric.add(hatInstance)

}

function exportFunc() {

document.getElementsByClassName("canvas-container")[0].style.display = "none";

document.getElementById("exportBtn").style.display = "none";

document.getElementById("tip").innerHTML = "长按图片保存或分享";

document.getElementById("change").style.display = "none";

cvs.style.display = "none";

exportImage.style.display = "block";

exportImage.src = canvasFabric.toDataURL({

width: screenWidth,

height: screenWidth

})

}

最后效果

拖动图片可见已经拼合成一张完整图片了

右键查看源代码

所有图片素材均来自腾讯官网

源码地址：https://gitee.com/alterem/avatar

演示地址：http://alterem.gitee.io/avatar/

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