場景

Fabricjs一個簡單強大的Canvas繪圖庫快速入門：

Fabricjs一個簡單強大的Canvas繪圖庫快速入門_BADAO_LIUMANG_QIZHI的博客-CSDN博客

在上面的基礎上，怎樣監聽畫布上鼠標按下、移動、抬起時的事件，以及畫布上對象

被選中、被移動、被旋轉、被加入和被移除的事件。

注：

博客：
https://blog.csdn.net/badao_liumang_qizhi?
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實現

1、畫布的事件監聽

????? //鼠標按下時事件canvas.on('mouse:down', function(options) {console.log("mouse:down"+options.e.clientX, options.e.clientY)})//鼠標移動時事件canvas.on('mouse:move', function(options) {console.log("mouse:move"+options.e.clientX, options.e.clientY)})//鼠標抬起時事件canvas.on('mouse:up', function(options) {console.log("mouse:up"+options.e.clientX, options.e.clientY)})

2、對象的事件監聽

????? //繪制不規則圖形var path = new fabric.Path('M 0 0 L 200 100 L 170 200 z');path.set({ left: 120, top: 120,fill:'red' });//選中監聽事件path.on('selected', function() {console.log('selected');});//對象移動監聽事件path.on('moving', function() {console.log('moving');});//對象被旋轉監聽事件path.on('rotating', function() {console.log('rotating');});//對象被加入監聽事件path.on('added', function() {console.log('added');});//對象被移除監聽事件path.on('removed', function() {console.log('removed');});

3、完整示例代碼

<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")// 聲明畫布var canvas = new fabric.Canvas("c");//鼠標按下時事件canvas.on('mouse:down', function(options) {console.log("mouse:down"+options.e.clientX, options.e.clientY)})//鼠標移動時事件canvas.on('mouse:move', function(options) {console.log("mouse:move"+options.e.clientX, options.e.clientY)})//鼠標抬起時事件canvas.on('mouse:up', function(options) {console.log("mouse:up"+options.e.clientX, options.e.clientY)})// create a rectangle object// 繪制圖形var rect = new fabric.Rect({left: 80, //距離畫布左側的距離，單位是像素top: 80, //距離畫布上邊的距離fill: "red", //填充的顏色width: 20, //方形的寬度height: 20, //方形的高度});// "add" rectangle onto canvas//添加圖形至畫布canvas.add(rect);//添加圖片fabric.Image.fromURL('images/light.png', function(oImg) {// scale image down, and flip it, before adding it onto canvas//縮小圖像并翻轉它oImg.scale(0.5).set('flipX', true);canvas.add(oImg);});//繪制不規則圖形var path = new fabric.Path('M 0 0 L 200 100 L 170 200 z');path.set({ left: 120, top: 120,fill:'red' });//選中監聽事件path.on('selected', function() {console.log('selected');});//對象移動監聽事件path.on('moving', function() {console.log('moving');});//對象被旋轉監聽事件path.on('rotating', function() {console.log('rotating');});//對象被加入監聽事件path.on('added', function() {console.log('added');});//對象被移除監聽事件path.on('removed', function() {console.log('removed');});canvas.add(path);},}, }; </script>

總結

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