[移动开发]在线板涂鸦微信小程序绘画板签字版实现在线涂鸦画板小程序源码

原文地址：https://www.yii666.com/learning/developers/139.html

板涂鸦,绘画板,签字版,效果源码

? ? ??场景1、在一些软件系统中，需要用到手写涂鸦的功能，然后可以将涂鸦的结果保存为图片，并可以将“真迹”通过网络发送给对方

? ? ??场景2、实现微信小程序，小游戏中，需要使用到绘画板,实现在线涂鸦画板小程序源码

? ? ? 场景3、APP端常用的在线填充颜色绘画功能,图画,画画H5在线功能

如何实现绘画板的基础功能？

查看以下小程序案例，绘画板微信小程序简单的涂鸦板，基础功能先实现，后期二次开发

index.js

let ctx;
Page({
  data:{
    pen:{
      lineWidth:5,
      color:"#cc0033"
    }
  },
  onLoad(options) {
    ctx=wx.createCanvasContext('myCanvas');
    ctx.setStrokeStyle(this.data.pen.color);
    ctx.setLineWidth(this.data.pen.lineWidth);
    ctx.setLineCap('round');
    ctx.setLineJoin('round');
  },
  touchstart(e) {
    ctx.setStrokeStyle(this.data.pen.color);
    ctx.setLineWidth(this.data.pen.lineWidth);
    ctx.moveTo(e.touches[0].x, e.touches[0].y);
  },
  touchmove(e) {
    let x = e.touches[0].x;
    let y = e.touches[0].y;
    ctx.lineTo(x, y)
    ctx.stroke();
    ctx.draw(true);
    ctx.moveTo(x,y)
  },
  penselect(e) {
    this.setData({'pen.lineWidth':e.target.dataset.param})
  },
  colorselect(e) {
    this.setData({ 'pen.color': e.target.dataset.param })
  }
})

index.wxml

<view class="container">
  <view class='canvas-area'>
    <canvas canvas-id='myCanvas' class='myCanvas' disable-scroll='false' bindtouchstart='touchstart' bindtouchmove='touchmove'></canvas>
  </view>
  <view class='canvas-tools'>
    <view class='box box1' bindtap='penselect' data-param="5"></view>
    <view class='box box2' bindtap='penselect' data-param="15"></view>
    <view class='box box3' bindtap='colorselect' data-param="#cc0033"></view>
    <view class='box box4' bindtap='colorselect' data-param="#ff9900"></view>
    <view class='box box5' bindtap='colorselect' data-param="#f8f8f8"></view>
  </view>
</view>

index.wxss

/**index.wxss**/
page{
  width: 100%;
  height: 100%;
}
.container{
  position: relative;
  height: 100%;
  width: 100%;
}
.canvas-area{
  width:100%;
  height: 100%;
  background-color: #f8f8f8;
}
.myCanvas{
  width: 100%;
  height: 100%;
}
.canvas-tools{
  position: fixed;
  left: 0;
  bottom: 20rpx;
  width: 100%;
  height: 100rpx;
  display: flex;
  flex-direction: row;
  justify-content: space-around;
}
.box{
  width: 100rpx;
  height: 100rpx;
  border-radius: 50%;
  background-color: rebeccapurple;
}
.box1{
  background-color: #99cccc;
  background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAACOklEQVRYR+2XzXETUQzHpfHsmdBBqABSAXEFkAqACrAPlsYnwsnz5INJBaQDkgoIFThUAB1grvbsiNGOl7HXT++9TcJMDryLD6uPn//Sk3YR7nBE5AoAXlVV9XQ8Hq9E5EZVl8w87hsO+zqIyFsA+Gx+RNT4i4jar6qeMbPBFZ9eALPZ7HgwGCwB4CgGAACrqqqemSqlBL0ATGoAeNkG7yqwVeGKmc8eHCCEMELExW7gGMD2+TsiuiyBKFJARF4AgEm/dxIAq7quT6bT6c8cRBFACOEWEZ/3ADDTGyIa3hsghHCOiB9igRIKNOaqOmbmTymIpALz+fxUVb96AQxgezN+ODbZUrgAi8XiaL1eLxHxOAWQg8yVwgUQEZPuvZP8uq7rUdtkIYTXAHCJiE9i9qlSRAEsICJ+cYJ9Z2a7FXsnVwoAGBLRbdcvCpAKpqofmfk8BufdFrNFxOFkMrFBtnfcEoQQTNI3XYcMQNQHAL4R0WkM2gVIqHBNRFbzg9Md1TsGJzH5G2VSd7RduxGbg4DebVDVaM+0MXMAf1dvB8K2nfVB01Sqak07cv5Mci8kAWwWbDabXymVcs/alxbPLrsLUp2dS55qvqISmJF3GwqSm8kFEXmlaUKUKOAuowKI7HtBFqBg1rsc3vDZdfinAADg3v/iHriPAu37QqpUWQUySybZBg8CYBlMhYKGOzCJLZ+uUckbUfPR0Tm/vdneFzQ3imPJ++Yw+/7b0LzaT667ZOz4/Ad4vAr8AXbVLzCeJobyAAAAAElFTkSuQmCC");
  background-repeat: no-repeat;
  background-position: center;
}
.box2{
  background-color: #0099cc;
  background-image: url("data:image/png;base64,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");
  background-repeat: no-repeat;
  background-position: center;
}
.box3{
  background-color: #cc0033;
}
.box4{
  background-color: #ff9900;
}
.box5{
  background-color: #cccccc;
  background-image: url("data:image/png;base64,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");
  background-repeat: no-repeat;
  background-position: center;
}