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java 教你如何给你的头像添加一个好看的国旗

2019-11-02 18:06 1176 查看

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;
var 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",
cornerStyle: "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/

以上就是本文的全部内容，希望对大家的学习有所帮助

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标签： java 头像添加

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