<template>
<div class="wraper" id="sketchpad-template" ref="wraper">
<div class="canvas-wraper">
<canvas id="canvas" ref="canvas"></canvas>
</div>
<div class="controlPanel">
<div class="text">
<p>视点涂鸦工具</p>
</div>
<div class="tool">
<div :class="[initIdx==idx ? 'contro-item active' : 'contro-item']"
v-for="(item,idx) in toolsArr" :key="idx"
@click="handleTools(item, idx)">
<i :class="'iconfont' + item.icon"
:title="item.title"></i>
</div>
<colorPicker class="color-list" v-model="drawColor" v-on:change="headleChangeColor"/>
<Slider v-model="drawWidth" :min=0 :max=50 style="width:150px;padding:0px 10px"></Slider>
</div>
</div>
<div class="download">
<img :src="imageBase64" v-show="imageBase64!=''" alt="">
</div>
</div>
</template>
<script>
import {fabric} from 'fabric';
import {Slider} from 'element-ui';
import { setTimeout } from 'timers';
export default {
name:'Sketchpad',
props: {
imgSrc: {
type: String
},
canvasHeight:{
type:Number
}
},
data() {
return {
onRemoveVaule:false,
onStartvalue:false,
currentTool: '',
done: false,
fabricObj: null,
initIdx: 0,
toolsArr: [{
name: 'pencil',
icon: ' iconhuabi',
title:'铅笔'
},
{
name: 'line',
icon: ' iconline',
title:'直线'
},
{
name: 'arrow',
icon: ' iconhj2',
title:'箭头'
},
{
name: 'xuxian',
icon: ' icon-xiaoxuxian',
title:'虚线'
},
{
name: 'text',
icon: ' iconwenzi1',
title:'文本'
},
{
name: 'juxing',
icon: ' iconjuxing',
title:'矩形'
},
{
name: 'cricle',
icon: ' iconyuanxingxuankuang',
title:'圆形'
},
{
name: 'ellipse',
icon: ' icontuoyuanxing',
title:'椭圆形'
},
{
name: 'equilateral', //三角形
icon: ' iconxingzhuang-sanjiaoxing',
title:'三角形'
},
{
name: 'remove',
icon: ' iconqingchu1',
title:'清除'
},
{
name: 'undo',
icon: ' iconzhixiang-houtui',
title:'上一步'
},
{
name: 'redo',
icon: ' iconzhixiang-qianjin',
title:'下一步'
},
{
name: 'reset',
icon: ' iconzhongzhi',
title:'重置'
},
{
name: 'test',
icon: ' iconicon-test',
title:'选中'
},
{
name: 'baocun',
icon: ' iconbaocun',
title:'保存'
}],
mouseFrom:{},
mouseTo:{},
moveCount: 1,
doDrawing: false,
fabricHistoryJson: [],
mods: 0,
drawingObject: null, //绘制对象
// drawColor: '#E34F51',
drawWidth: 4,
drawColor:'#E34F51',
imageBase64: '',
zoom: window.zoom ? window.zoom : 1,
}
},
components:{
Slider
},
mounted() {
//初始化canvas
setTimeout(()=>{
this.initCanvas()
},500)
},
watch:{
'drawWidth': function(newVal){
this.drawWidth = newVal;
this.fabricObj.freeDrawingBrush.width = newVal
},
},
computed:{
canvasWidth() {
return window.innerWidth
}
},
methods:{
initCanvas() {
// let _this = this;
this.fabricObj = new fabric.Canvas('canvas',{
isDrawingMode: true, // 开启画笔
selectable: false,
selection: false,
// perPixelTargetFind: true,
devicePixelRatio:true, //Retina 高清屏 屏幕支持
})
this.fabricObj.setBackgroundImage(this.imgSrc, this.fabricObj.renderAll.bind(this.fabricObj), {
backgroundImageOpacity: 0.5, // should the image be resized to fit the container?
backgroundImageStretch: false
});
// console.log(this.$parent.canvasHeight)
this.fabricObj.freeDrawingBrush.color = '#E34F51'
this.fabricObj.freeDrawingBrush.width = this.drawWidth
this.fabricObj.setWidth(this.canvasWidth)
this.fabricObj.setHeight(this.$parent.canvasHeight)
console.log(this.canvasWidth,this.$parent.canvasHeight)
this.fabricObj.add(
// new fabric.Rect({ top: 100, left: 100, width: 50, height: 50, fill: '#f55' }),
// new fabric.Circle({ top: 140, left: 230, radius: 75, fill: 'green' }),
// new fabric.Triangle({ top: 300, left: 210, width: 100, height: 100, fill: 'blue' }),
);
//绑定画板事件
this.fabricObjAddEvent()
// console.log(this.fabricObj._onSelected)
},
//事件监听
fabricObjAddEvent() {
this.fabricObj.on({
'mouse:down': (o)=> {
this.mouseFrom.x = o.pointer.x;
this.mouseFrom.y = o.pointer.y;
this.doDrawing = true;
if(this.currentTool=='text') {
this.drawText()
}
},
'mouse:up': (o)=> {
this.mouseTo.x = o.pointer.x;
this.mouseTo.y = o.pointer.y;
this.drawingObject = null;
this.moveCount = 1;
this.doDrawing = false;
this.updateModifications(true);
},
'mouse:move': (o)=> {
if (this.moveCount % 2 && !this.doDrawing) {
//减少绘制频率
return;
}
this.moveCount++;
this.mouseTo.x = o.pointer.x;
this.mouseTo.y = o.pointer.y;
if(this.onStartvalue){
this.drawing();
}
},
//对象移动事件
'object:moving': (e)=> {
e.target.opacity = 0.5;
},
'object:added':(e)=>{
console.log(e)
},
//增加对象
'object:added': ()=>{
// debugger
},
'object:modified':(e)=> {
e.target.opacity = 1;
let object = e.target;
this.updateModifications(true)
},
'selection:created': (e)=>{
console.log(e)
if(this.onRemoveVaule){
if (e.target._objects) {
//多选删除
var etCount = e.target._objects.length;
for (var etindex = 0; etindex < etCount; etindex++) {
this.fabricObj.remove(e.target._objects[etindex]);
}
} else {
//单选删除
this.fabricObj.remove(e.target);
}
this.fabricObj.discardActiveObject(); //清除选中框
this.updateModifications(true)
}else {
// this.onRemoveVaule = false;
// this.fabricObj.isDrawingMode = false;
// this.fabricObj.skipTargetFind = false;
}
},
});
},
//储存历史记录
updateModifications(savehistory) {
if(savehistory==true) {
this.fabricHistoryJson.push(JSON.stringify(this.fabricObj))
}
},
//canvas 历史后退
undo() {
let state = this.fabricHistoryJson
if(this.mods < state.length) {
this.fabricObj.clear().renderAll();
this.fabricObj.loadFromJSON(state[state.length - 1 - this.mods - 1]);
this.fabricObj.renderAll();
this.mods += 1;
if(this.mods == state.length){
this.fabricObj.setBackgroundImage(this.imgSrc, this.fabricObj.renderAll.bind(this.fabricObj), {
// Optionally add an opacity lvl to the image
backgroundImageOpacity: 0.5, // should the image be resized to fit the container?
backgroundImageStretch: false
});
}
}
},
//前进
redo() {
let state = this.fabricHistoryJson
if (this.mods > 0) {
this.fabricObj.clear().renderAll();
this.fabricObj.loadFromJSON(state[state.length - 1 - this.mods + 1]);
this.fabricObj.renderAll();
this.mods -= 1;
}
},
transformMouse(mouseX, mouseY) {
return { x: mouseX / this.zoom, y: mouseY / this.zoom };
},
resetObj() {
this.fabricObj.selectable = false
this.fabricObj.selection = false
this.fabricObj.skipTargetFind = true
//清除文字对象
if(this.textboxObj) {
this.textboxObj.exitEditing();
this.textboxObj = null;
}
},
handleTools(tools, idx) {
console.log(tools.name)
this.initIdx = idx;
this.currentTool = tools.name;
this.fabricObj.isDrawingMode = false;
this.resetObj()
switch(tools.name) {
case 'pencil':
this.fabricObj.isDrawingMode = true;
break;
case 'remove':
this.fabricObj.discardActiveObject().renderAll(); //清除画布选中元素
this.onRemoveVaule = true;
this.fabricObj.selection = true
this.fabricObj.skipTargetFind = false
this.fabricObj.selectable = true
break;
case 'reset':
this.onStartvalue = true;
this.fabricObj.clear();
this.fabricObj.setBackgroundImage(this.imgSrc, this.fabricObj.renderAll.bind(this.fabricObj), {
// Optionally add an opacity lvl to the image
backgroundImageOpacity: 0.5, // should the image be resized to fit the container?
backgroundImageStretch: false
});
break;
case 'redo':
this.onStartvalue = true;
this.redo();
break;
case 'undo':
this.onStartvalue = true;
this.undo();
break;
case 'xuxian':
this.onStartvalue = true;
break;
case 'arrow':
this.onStartvalue = true;
break;
case 'line':
this.onStartvalue = true;
break;
case 'juxing':
this.onStartvalue = true;
break;
case 'cricle':
this.onStartvalue = true;
break;
case 'ellipse':
this.onStartvalue = true;
break;
case 'equilateral':
this.onStartvalue = true;
break;
case 'test':
this.onSelect()
break;
case 'baocun':
this.downLoadImage()
break;
default:
break;
}
},
//绘制文字对象
drawText() {
this.textboxObj = new fabric.Textbox(" ", {
left: this.mouseFrom.x,
top: this.mouseFrom.y,
width: 220,
fontSize: 22,
fill: this.drawColor,
hasControls: true
});
this.fabricObj.add(this.textboxObj);
this.textboxObj.enterEditing();
this.textboxObj.hiddenTextarea.focus();
this.updateModifications(true)
},
drawing() {
// let _this = this;
if(this.drawingObject) {
this.fabricObj.remove(this.drawingObject)
}
let fabricObject = null
switch (this.currentTool) {
case 'pencil':
this.fabricObj.isDrawingMode = true
break;
case 'line':
fabricObject = new fabric.Line([this.mouseFrom.x,this.mouseFrom.y,this.mouseTo.x,this.mouseTo.y],{
stroke: this.drawColor,
strokeWidth: this.drawWidth
})
break;
case 'arrow':
fabricObject = new fabric.Path(this.drawArrow(this.mouseFrom.x, this.mouseFrom.y, this.mouseTo.x, this.mouseTo.y, 17.5, 17.5), {
stroke: this.drawColor,
fill: "rgba(255,255,255,0)",
strokeWidth: this.drawWidth
});
break;
case 'xuxian': //doshed line
fabricObject = new fabric.Line([this.mouseFrom.x, this.mouseFrom.y, this.mouseTo.x, this.mouseTo.y],{
strokeDashArray: [10, 3],
stroke: this.drawColor,
strokeWidth: this.drawWidth
})
break;
case 'juxing': //矩形
var path = "M " +
this.mouseFrom.x +
" " +
this.mouseFrom.y +
" L " +
this.mouseTo.x +
" " +
this.mouseFrom.y +
" L " +
this.mouseTo.x +
" " +
this.mouseTo.y +
" L " +
this.mouseFrom.x +
" " +
this.mouseTo.y +
" L " +
this.mouseFrom.x +
" " +
this.mouseFrom.y +
" z";
fabricObject = new fabric.Path(path, {
left: this.mouseFrom.x,
top: this.mouseFrom.y,
stroke: this.drawColor,
strokeWidth: this.drawWidth,
fill: "rgba(255, 255, 255, 0)"
});
break;
case "cricle": //正圆
var radius = Math.sqrt((this.mouseTo.x - this.mouseFrom.x) * (this.mouseTo.x - this.mouseFrom.x) + (this.mouseTo.y - this.mouseFrom.y) * (this.mouseTo.y - this.mouseFrom.y)) / 2;
fabricObject = new fabric.Circle({
left: this.mouseFrom.x,
top: this.mouseFrom.y,
stroke: this.drawColor,
fill: "rgba(255, 255, 255, 0)",
radius: radius,
strokeWidth: this.drawWidth
});
break;
case "ellipse": //椭圆
var left = this.mouseFrom.x;
var top = this.mouseFrom.y;
var ellipse = Math.sqrt((this.mouseTo.x - left) * (this.mouseTo.x - left) + (this.mouseTo.y - top) * (this.mouseTo.y - top)) / 2;
fabricObject = new fabric.Ellipse({
left: left,
top: top,
stroke: this.drawColor,
fill: "rgba(255, 255, 255, 0)",
originX: "center",
originY: "center",
rx: Math.abs(left - this.mouseTo.x),
ry: Math.abs(top - this.mouseTo.y),
strokeWidth: this.drawWidth
});
break;
case "equilateral": //等边三角形
var height = this.mouseTo.y - this.mouseFrom.y;
fabricObject = new fabric.Triangle({
top: this.mouseFrom.y,
left: this.mouseFrom.x,
width: Math.sqrt(Math.pow(height, 2) + Math.pow(height / 2.0, 2)),
height: height,
stroke: this.drawColor,
strokeWidth: this.drawWidth,
fill: "rgba(255,255,255,0)"
});
break;
case 'remove':
break;
default:
// statements_def'
break;
}
if(fabricObject) {
this.fabricObj.add(fabricObject)
this.drawingObject = fabricObject;
}
},
//书写箭头的方法
drawArrow(fromX, fromY, toX, toY, theta, headlen) {
theta = typeof theta != "undefined" ? theta : 30;
headlen = typeof theta != "undefined" ? headlen : 10;
// 计算各角度和对应的P2,P3坐标
let angle = Math.atan2(fromY - toY, fromX - toX) * 180 / Math.PI,
angle1 = (angle + theta) * Math.PI / 180,
angle2 = (angle - theta) * Math.PI / 180,
topX = headlen * Math.cos(angle1),
topY = headlen * Math.sin(angle1),
botX = headlen * Math.cos(angle2),
botY = headlen * Math.sin(angle2);
let arrowX = fromX - topX,
arrowY = fromY - topY;
let path = " M " + fromX + " " + fromY;
path += " L " + toX + " " + toY;
arrowX = toX + topX;
arrowY = toY + topY;
path += " M " + arrowX + " " + arrowY;
path += " L " + toX + " " + toY;
arrowX = toX + botX;
arrowY = toY + botY;
path += " L " + arrowX + " " + arrowY;
return path;
},
downLoadImage() {
// this.done = true;
//生成双倍像素比的图片
let base64URl = this.fabricObj.toDataURL({
formart: 'png',
multiplier: 2
});
this.imageBase64 = base64URl;
this.$emit("onChang", { type: base64URl });
// this.done = false;
},
onSelect(){
this.onRemoveVaule = false;
this.onStartvalue = false;
this.fabricObj.isDrawingMode = false;
this.fabricObj.skipTargetFind = false;
},
headleChangeColor(value){
this.drawColor = value;
console.log(value)
this.fabricObj.freeDrawingBrush.color = value
}
},
}
</script>
<style lang="scss" scoped>
.wraper{
position: relative;
width: 100%;
height: 100%;
.canvas-wraper{
// height: 50%;
height: 100%;
width: 100%;
// margin-bottom: 10px;
overflow: hidden;
}
.controlPanel{
position: absolute;
width: 800px;
bottom: 30px;
// width: 100%;
// height: 32px;
// background: #ddd;
left: 50%;
transform: translateX(-50%);
box-shadow: 1px 3px 10px 0 rgba(150, 150, 150, 0.4);
background: rgba(255, 255, 255, 1);
border-radius: 5px;
display: flex;
flex-direction: column;
box-sizing: border-box;
// justify-content: center;
// align-items: center;
// margin-bottom: 15px;
.text {
display: inline-block;
padding-left: 15px;
font-size: 12px;
letter-spacing: 1px;
color: #aaaaaa;
line-height: 20px;
border-bottom: 1px solid #eeeeee;
}
.tool {
display: flex;
}
.contro-item{
width: 38px;
// flex-basis: 100px;
// border-right: 1px solid #dad7d9;
text-align: center;
cursor: pointer;
background: #fefefe;
i{
height: 100%;
font-size: 22px;
line-height: 25px;
display: flex;
justify-content: center;
align-items: center;
}
&.active{
// background: #e34f51;
color: #00BFFF;
border-radius: 3px;
i{
font-size: 26px;
}
}
}
.color-list {
width: 38px;
display: flex;
justify-content: center;
align-items: center;
}
}
.spn {
display: block;
width: 20px;
height: 20px;
}
.download{
img{
width: 100%;
}
}
}
</style>
<style>
.controlPanel .box {
bottom: 0px;
}
.wraper .el-slider__button-wrapper {
z-index: 0 !important;
}
</style>
