本文主要介绍了VUE 自定义取色器组件的实现，分享给大家，具体如下：
效果：
功能：
1。点击色块中任何一点，色块中的正方形显示该点的颜色。
2。点击色块上方的颜色圆点，色块选中该颜色所在的位置，并在正方形中显示相应颜色。
3。上方圆点如果不是rgb格式，需要转换。
4。组件的大小从调用它的页面中传过去。
组件代码(CanvasColor2.vue)：
<template>
<!-- <div>-->
<div id='outDiv' style="position: relative">
<!-- <canvas class="box" id="show" :style="{width:canvasWidth+'px',height:canvasHeight+'px'}"></canvas>-->
<canvas class="box" id="show" width="300px" height="150px"></canvas>
<div class="cover" id='cover'></div>
<em id="cur"></em>
</div>
</template>
<script>
export default {
name: "CanvasColor2",
data() {
return {
canvas:null,
context:null,
paramColor:'',
viewWidth:0,
viewHeight:0
}
},
props:{
data:String,
canvasWidth:Number,
canvasHeight:Number,
},
created() {
this.viewWidth = this.canvasWidth;
this.viewHeight = this.canvasHeight;
},
mounted() {
this.getParamColor('rgb(0,3,243)');
this.initData();
this.getDotList();
},
methods:{
async getDotList(){
this.canvas = document.getElementById("show");
this.context = this.canvas.getContext("2d");
console.log('getDotList',this.canvas.offsetLeft);
// 获取整个 canvas 的像素信息
var imgData = this.context.getImageData(0, 0,this.canvas.width+this.canvas.offsetLeft, this.canvas.height+this.canvas.offsetTop);
// 清空数组
var dotList = [];
// 最后实现的效果每个点之间有一定的距离，gap 就是控制这个距离的
var gap = 1;
// 通过 width 和 height 遍历 imgData 对象，每隔 gap 个点取一次像素，找到红色的像素，
// 每找到一个红色点，就创建一个 Dot 对象，并添加到 dotList 数组中
for (var x = 0; x < imgData.width; x += gap) {
for (var y = 0; y < imgData.height; y += gap) {
var i = (y * imgData.width + x) * 4;
// console.log('getDotList',i);
// 判断像素点是不是红色
if (imgData.data[i] == this.paramColor[0] && imgData.data[i + 1] == this.paramColor[1] && imgData.data[i + 2] == this.paramColor[2]) {
var dot = {x,y} ;
dotList.push(dot);
}
}
}
if (dotList && dotList.length != 0) {
var cur = document.getElementById('cur');
cur.style.left = (dotList[0].x+this.canvas.offsetLeft)+'px';
cur.style.top = (dotList[0].y+this.canvas.offsetTop)+'px';
}
console.log('dot',dotList);
return dotList;
},
initData() {
var show = document.getElementById("show");
show.setAttribute("width",this.canvasWidth);
show.setAttribute("height",this.canvasHeight);
// var cover = document.getElementById("cover");
var cur = document.getElementById("cur");
if (show.getContext) {//首先判断getcontext方法是否存在，这是一个良好的习惯
var context = show.getContext('2d');
var gradientBar = context.createLinearGradient(0, show.height, show.width, show.height);//创建渐变，前两个参数是渐变开始的横纵坐标，后两个参数是渐变结束的横纵坐标
gradientBar.addColorStop(0, '#ff0000');
gradientBar.addColorStop(1 / 6, '#ff00ff');
gradientBar.addColorStop(2 / 6, '#0000ff');
gradientBar.addColorStop(3 / 6, '#00ffff');
gradientBar.addColorStop(4 / 6, '#00ff00');
gradientBar.addColorStop(5 / 6, '#ffff00');
gradientBar.addColorStop(1, '#ff0000');
context.fillStyle = gradientBar;
context.fillRect(0, 0, show.width, show.width);
//白色透明黑色，明暗度实现
var lightToDark = context.createLinearGradient(0, 0, 0, show.width);
lightToDark.addColorStop(0, "#fff");
lightToDark.addColorStop(1 / 2, 'rgba(255,255,255,0)');
lightToDark.addColorStop(1, '#000');
context.fillStyle = lightToDark;
context.fillRect(0, 0, show.width, show.width);
show.addEventListener('click', function (e) {
var ePos = {
x: e.layerX || e.offsetX,
y: e.layerY || e.offsetY
}
//前两个参数为鼠标的位置，后娘个参数为canvas的宽高
var imgData = context.getImageData(ePos.x, ePos.y, show.width, show.height).data;
//可以通过下面的方法获得当前的rgb值
var red = imgData[0];
var green = imgData[1];
var blue = imgData[2];
var rgbStr = "rgb(" + red + "," + green + ',' + blue + ")";
console.log(rgbStr);
var cover = document.getElementById("cover");
cover.style.backgroundColor = rgbStr;
// var cur = document.getElementById("cur");
var outDiv = document.getElementById('outDiv');
console.log('outDiv',outDiv.offsetTop+','+outDiv.offsetHeight);
var pos = {
x: e.clientX,
y: e.clientY-outDiv.offsetTop//当该组件整体为相对位置时，y轴的坐标是当前点的位置-最外层距离顶点的高度
}
cur.style.left = pos.x + 'px';
cur.style.top = pos.y + 'px';
console.log('onmousemove',cur.style.left);
});
}
},
getParamColor(color) {
let param = color;
console.log('getParamColor',param.length)
param = param.substring(4,param.length-1);
console.log('getParamColor',param)
this.paramColor = param.split(',');
this.getDotList();
var cover = document.getElementById("cover");
cover.style.backgroundColor = color;
}
}
}
</script>
<style scoped>
.box {
position: relative;
background-color: pink;
border-radius: 15px;
}
#cur {
width: 13px;
height: 13px;
outline: 2px solid #ffffff;
margin-left: -1px;
margin-top: -1px;
position: absolute;
border-radius: 13px;
}
#cover{
position: absolute;
left: 100px;
top: 10px;
width: 50px;
height: 50px;
background-color: antiquewhite;
pointer-events: none;
}
</style>调用：
<template>
<div style="background-color: black">
<div style="display: flex; height: 44px;align-items: center">
<div style="width: 100px;color: white">彩光</div>
<div style="width: 100px;color: white">白光</div>
</div>
<div style="display: flex; height: 44px;align-items: center;">
<div class="btn_style-common" style="background-color: rgb(41,53,255)" @click="selectColor('rgb(41,53,255)')"></div>
<div class="btn_style-common" style=" background-color: rgb(255,202,83)" @click="selectColor('rgb(255,202,83)')"></div>
</div>
<CanvasColor2 ref="canvasColor" :data="color" :canvas-width="340" :canvas-height="170"></CanvasColor2>
</div>
</template>
<script>
import CanvasColor2 from "./CanvasColor2";
import '../../util/utils.js'
export default {
name: "yxfColor",
components:{
CanvasColor2
},
data() {
return {
color:'rgb(100,255,83)'
}
},
mounted() {
this.$refs.canvasColor.getParamColor(this.color)
},
methods:{
selectColor(color) {
if (color.indexOf('rgb') != 0) {
this.color = color.colorRgb();
} else {
this.color = color;
}
this.$refs.canvasColor.getParamColor(this.color)
},
}
}
</script>
<style scoped>
.btn_style-common {
height: 20px;width: 20px; border-radius: 20px;margin-left: 20px;
}
</style>颜色从十六进制转换成RGB格式：utils.js
String.prototype.colorRgb = function () {
// 16进制颜色值的正则
var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
// 把颜色值变成小写
var color = this.toLowerCase();
if (reg.test(color)) {
// 如果只有三位的值，需变成六位，如：#fff => #ffffff
if (color.length === 4) {
var colorNew = "#";
for (var i = 1; i < 4; i += 1) {
colorNew += color.slice(i, i + 1).concat(color.slice(i, i + 1));
}
color = colorNew;
}
// 处理六位的颜色值，转为RGB
var colorChange = [];
for (var j = 1; j < 7; j += 2) {
colorChange.push(parseInt("0x" + color.slice(j, j + 2)));
}
return "RGB(" + colorChange.join(",") + ")";
} else {
return color;
}
};注意：
组件中最外层的div的位置设为相对位置，页面中的坐标设置都是相对于最外层div的，所以在设置点击位置的时候要减去最外层div的距离顶部的高度。即
var pos = {
x: e.clientX,
y: e.clientY-outDiv.offsetTop//当该组件整体为相对位置时，y轴的坐标是当前点的位置-最外层距离顶点的高度
}
到此这篇关于VUE 自定义取色器组件的实现的文章就介绍到这了,更多相关VUE 取色器 内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
