场景
Fabricjs一个简单强大的Canvas绘图库快速入门：
Fabricjs一个简单强大的Canvas绘图库快速入门_BADAO_LIUMANG_QIZHI的博客-CSDN博客
在上面的基础上，在画布上添加完对象之后，可以将整个画布转换成json数据。
然后还可以将json数据反序列成画布。
还可以将画布转换成svg。
注：
博客：
BADAO_LIUMANG_QIZHI的博客_霸道流氓气质_CSDN博客-C#,SpringBoot,架构之路领域博主
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实现
1、将画布序列化成json数据
//序列化
var canvasJsonData = JSON.stringify(canvas.toJSON());
console.log("toJSON="+canvasJsonData);2、转换成svg
console.log("toSVG="+canvas.toSVG());3、完整示例代码
<template>
<div>
<div>
<canvas id="c" width="800" height="800"></canvas>
</div>
</div>
</template>
<script>
import { fabric } from "fabric";
export default {
name: "HelloFabric",
data() {
return {};
},
mounted() {
this.init();
},
methods: {
init() {
// create a wrapper around native canvas element (with id="c")
// 声明画布
var canvas = new fabric.Canvas("c");
// //鼠标按下时事件
// canvas.on('mouse:down', function(options) {
// console.log("mouse:down"+options.e.clientX, options.e.clientY)
// })
// //鼠标移动时事件
// canvas.on('mouse:move', function(options) {
// console.log("mouse:move"+options.e.clientX, options.e.clientY)
// })
// //鼠标抬起时事件
// canvas.on('mouse:up', function(options) {
// console.log("mouse:up"+options.e.clientX, options.e.clientY)
// })
// create a rectangle object
// 绘制图形
var rect = new fabric.Rect({
left: 80, //距离画布左侧的距离，单位是像素
top: 80, //距离画布上边的距离
fill: "red", //填充的颜色
width: 20, //方形的宽度
height: 20, //方形的高度
});
// "add" rectangle onto canvas
//添加图形至画布
canvas.add(rect);
//添加图片
fabric.Image.fromURL('images/light.png', function(oImg) {
// scale image down, and flip it, before adding it onto canvas
//缩小图像并翻转它
oImg.scale(0.5).set('flipX', true);
canvas.add(oImg);
});
//绘制不规则图形
var path = new fabric.Path('M 0 0 L 200 100 L 170 200 z');
path.set({ left: 120, top: 120,fill:'red' });
//选中监听事件
path.on('selected', function() {
console.log('selected');
});
//对象移动监听事件
path.on('moving', function() {
console.log('moving');
});
//对象被旋转监听事件
path.on('rotating', function() {
console.log('rotating');
});
//对象被加入监听事件
path.on('added', function() {
console.log('added');
});
//对象被移除监听事件
path.on('removed', function() {
console.log('removed');
});
canvas.add(path);
//绘制圆形
var circle = new fabric.Circle({
radius: 100,
fill: '#f00',
scaleY: 0.5,
originX: 'center', //调整中心点的X轴坐标
originY: 'center' //调整中心点的Y轴坐标
});
//绘制文本
var text = new fabric.Text('公众号:霸道的程序猿', {
fontSize: 20,
originX: 'center',
originY: 'center'
})
//进行组合
var group = new fabric.Group([circle, text], {
left: 350,
top: 200,
angle: 10
})
canvas.add(group);
//序列化
var canvasJsonData = JSON.stringify(canvas.toJSON());
console.log("toJSON="+canvasJsonData);
//toSVG
console.log("toSVG="+canvas.toSVG());
},
},
};
</script>4、反序列化Json数据
var canvas = new fabric.Canvas("c");
canvas.loadFromJSON('{"objects":[{"type":"rect","left":50,"top":50,"width":20,"height":20,"fill":"green","overlayFill":null,"stroke":null,"strokeWidth":1,"strokeDashArray":null,"scaleX":1,"scaleY":1,"angle":0,"flipX":false,"flipY":false,"opacity":1,"selectable":true,"hasControls":true,"hasBorders":true,"hasRotatingPoint":false,"transparentCorners":true,"perPixelTargetFind":false,"rx":0,"ry":0},{"type":"circle","left":100,"top":100,"width":100,"height":100,"fill":"red","overlayFill":null,"stroke":null,"strokeWidth":1,"strokeDashArray":null,"scaleX":1,"scaleY":1,"angle":0,"flipX":false,"flipY":false,"opacity":1,"selectable":true,"hasControls":true,"hasBorders":true,"hasRotatingPoint":false,"transparentCorners":true,"perPixelTargetFind":false,"radius":50}],"background":"rgba(0, 0, 0, 0)"}');完整示例代码
<template>
<div>
<div>
<canvas id="c" width="800" height="800"></canvas>
</div>
</div>
</template>
<script>
import { fabric } from "fabric";
export default {
name: "FabricLoadFromJSON",
data() {
return {};
},
mounted() {
this.init();
},
methods: {
init() {
//加载json数据显示
var canvas = new fabric.Canvas("c");
canvas.loadFromJSON('{"objects":[{"type":"rect","left":50,"top":50,"width":20,"height":20,"fill":"green","overlayFill":null,"stroke":null,"strokeWidth":1,"strokeDashArray":null,"scaleX":1,"scaleY":1,"angle":0,"flipX":false,"flipY":false,"opacity":1,"selectable":true,"hasControls":true,"hasBorders":true,"hasRotatingPoint":false,"transparentCorners":true,"perPixelTargetFind":false,"rx":0,"ry":0},{"type":"circle","left":100,"top":100,"width":100,"height":100,"fill":"red","overlayFill":null,"stroke":null,"strokeWidth":1,"strokeDashArray":null,"scaleX":1,"scaleY":1,"angle":0,"flipX":false,"flipY":false,"opacity":1,"selectable":true,"hasControls":true,"hasBorders":true,"hasRotatingPoint":false,"transparentCorners":true,"perPixelTargetFind":false,"radius":50}],"background":"rgba(0, 0, 0, 0)"}');
},
},
};
</script>