小程序大转盘抽奖 canvas animation

2023-10-20 09:47:40

项目需求运用到大转盘可设置概率可直接自定义结果效果如下

小程序大转盘抽奖 canvas animation ?

两种方法及结合法

一通过canvas 实现但是因为定时器原因手机端卡顿严重故而最终使用了方法二但也是该记录下学习canvas

二通过小程序Api animation完成完美解决卡顿问题更精确定位有样式缺陷 css无法解决样式自动分配问题故结合一二两种方法出现第三种

三通过小程序Api animation 做动画旋转样式用canvas来实现完美解决各类问题

话不多说踩坑部分就不展示直接上第三种方法

创建动画区域（animation）动画可参考小程序官方API animationData动画参数在点击开始的时候填充数据

<view class="wrapper-content" style=‘margin:0 auto;‘>
  <view class="canvas-container">
    <view animation="{{animationData}}" class="canvas-content" style=‘margin:0 auto;‘>    
    </view>
  </view>
</view>
//CSS

.wrapper-content{
  background: #E0CFBC;
  border-radius: 50%;
  width: 720rpx;
  height: 720rpx;
  padding: 40rpx;
  position: relative;
  box-sizing: border-box;
  z-index: 101;
}
.canvas-container {
  margin: 0 auto;
  position: absolute;
  left: 40rpx;
  top: 40rpx;
  width: 640rpx;
  height: 640rpx;
  border-radius: 50%;
}
.canvas-content {
  overflow: hidden;
  box-sizing: content-box;
  border: 20rpx solid #CDB193;
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  display: block;
  width: 600rpx;
  height: 600rpx;
  border-radius: inherit;
  background-clip: padding-box;
}

配合CSS3 扇形实现圆盘

html

 <!-- 扇形 -->
              <view class="canvas-list">
                <view class="canvas-item2" wx:for="{{awardsConfig.slicePrizes}}" wx:key="key" style="transform: rotate({{item.item2Deg}});background-color:{{awardsConfig.slicePrizes.length==2?(index%2==0?‘#faf5e7‘:‘#f3e2c6‘):‘‘}};opacity:{{  awardsConfig.slicePrizes.length==2?item.opacity:  awardsConfig.slicePrizes.length==3?item.opacity:‘‘}};width:{{size}}rpx;height:{{size/2-2}}rpx;transform-origin:{{size/2}}rpx {{size/2}}rpx">
                  <view class="canvas-item2-after" style="transform: rotate({{item.afterDeg}});background-color:{{index%2==0?‘#faf5e7‘:‘#f3e2c6‘}};opacity:{{  awardsConfig.slicePrizes.length==3?‘‘:item.opacity}};width:{{size/2}}rpx;height:{{size/2}}rpx;transform-origin: {{size/2}}rpx {{size/2}}rpx">
                  </view>
                  <view wx:if=‘{{awardsConfig.slicePrizes.length==3}}‘ class="canvas-item2-after" style="background-color:{{index%2==0?‘#faf5e7‘:‘#f3e2c6‘}};width:{{size/2}}rpx;height:{{size/2}}rpx;transform-origin: {{size/2}}rpx {{size/2}}rpx"></view>
                </view>
              </view>
              <!-- 选项内容 -->
              <view class="wk-wheel-list">
                <view class="wk-wheel-item" data-index="{{index}}" wx:for="{{awardsConfig.slicePrizes}}" wx:key=‘key‘>
                  <view class="wk-wheel-icontent" style="height:262rpx;overflow:hidden;font-size:{{item.text.length>9?‘20‘:‘26‘}}rpx;padding-top:5rpx;transform: rotate({{index*turnNum}}turn);transform-origin: 50% {{size/2-2}}rpx">
                    <view class="canvas-litem-text-name">{{item.text}}</view>
                    <view class="canvas-litem-text-image">
                      <image src="{{item.img}}" mode="widthFix" style="width:80rpx;max-height:60rpx;padding:10rpx 0 0;"></image>
                      <view class="canvas-litem-text-image-num">100</view>
                    </view>
                    <view style="font-size:20rpx;">{{item.num}}x1</view>
                  </view>
                </view>
              </view>
            </view>

CSS

/* //css扇形 */
.canvas-item2 {
   position: absolute;
   left: 0px;
   top: 0;
   width: 620rpx;
   height: 328rpx;
   color: #e4370e;
   font-weight: bold;
   transform-origin: 330rpx 330rpx;
   overflow: hidden;
}
 
.canvas-item2-after {
   position: absolute;
   top: 0;
   left: 0;
   width: 330rpx;
   height: 330rpx;
   transform-origin: 330rpx 330rpx;
   opacity: 1;
}
 
.wk-wheel-list {
   position: absolute;
   left: 0;
   top: 0;
   width: 100%;
   height: 100%;
   z-index: 9;
}
 
.wk-wheel-item {
   position: absolute;
   left: 0;
   top: 0;
   width: 100%;
   height: 100%;
   color: #fff;
   text-shadow: 0 1px 1px rgba(255, 255, 255, 0.6);
}
 
.wk-wheel-icontent {
   position: relative;
   display: block;
   padding-top: 50rpx;
   margin: 0 auto;
   text-align: center;
   transform-origin: 50% 328rpx;
   color: #AA8B6B;
}

1.awardsConfig.slicePrizes为奖品列表因为大转盘是圆的所以W H 是一样的

2.this.data.windowWidth 是屏幕的宽度小程序有API 可以获取用屏幕宽度/750*设置内容宽度rpx = 实际内容宽度的px 值

3.size 是圆盘的宽度

设置点击抽奖按钮两种方法一直接在canvas内绘制二在HTML里面通过定位实现

提供二 HTML 定位实现按钮

<view class="canvas-btn" bindtap="getLottery">
         <view>
            <view style="font-size:56rpx;color:#fff;padding-bottom:4rpx;">开始</view>
            <view style="font-size:20rpx;color:#6F5942;font-weight:600;">点击抽奖</view>
          </view>
</view>

css

.canvas-btn {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  position: absolute;
  left: 50%;
  top: 50%;
  margin-left: -110rpx;
  margin-top: -110rpx;
  z-index: 400;
  width: 220rpx;
  height: 220rpx;
  border-radius: 50%;
  color: #f4e9cc;
  border: 10px solid #cdb193;
  text-align: center;
  font-size: 40rpx;
  text-decoration: none;
  box-sizing: border-box;
}

.canvas-btn>view {
  position: absolute;
  top: 7%;
  left: 7%;
  width: 86%;
  height: 86%;
  border-radius: 50%;
  box-sizing: border-box;
  padding: 22rpx 20rpx 0;
  background: linear-gradient(134deg, rgba(232, 219, 197, 1) 0%, rgba(205, 177, 147, 1) 100%);
  /* box-shadow:0px 5px 7px 0px rgba(255,255,255,1); */
  margin: auto;
  z-index: 102;
}

.canvas-btn::after {
  position: absolute;
  display: block;
  content: ‘ ‘;
  left: 39%;
  top: -78%;
  width: 0;
  height: 0;
  overflow: hidden;
  border-width: 80rpx 20rpx 80rpx 20rpx;
  border-style: solid;
  border-color: transparent;
  border-bottom-color: #ffab52;
}

getLottery() {
    let that = this;
    // 获取奖品配置
    let awardsConfig = that.data.awardsConfig,
        runNum = 12, len = awardsConfig.slicePrizes.length,
        awardIndex = 0;
    awardIndex = parseInt(Math.random() * 6)
    console.log("奖品序号：" + awardIndex);
    // 旋转抽奖
    app.runDegs = app.runDegs || 0
    app.runDegs = app.runDegs + (360 - app.runDegs % 360) + (360 * runNum - awardIndex * (360 / len))
    //创建动画
    let animationRun = wx.createAnimation({
      duration: 4000,
      timingFunction: ‘ease‘
    })
    console.log(awardsConfig.slicePrizes[awardIndex]);
    that.animationRun = animationRun
    animationRun.rotate(app.runDegs - (360 / len * 2 + (360 / len)) ).step()
    that.setData({
      animationData: animationRun.export()
    })
  },

点击按钮触发getLottery 进行动画数据填充实现旋转效果 runNum为旋转的圈数 awardIndex为中奖的序号

整体如此完美实现献上整体代码

html

<view class="wrapper-content" style=‘margin:0 auto;‘>
          <view class="canvas-container-quiu" wx:for="{{list}}" style="-webkit-transform: rotate({{index * (360/list.length)}}deg);transform: rotate({{index * (360/list.length)}}deg);{{index%2==0?‘background:#F2E86D‘:‘background:#ffffff‘}}"></view>
          <view class="canvas-container">
            <view animation="{{animationData}}" class="canvas-content" style=‘margin:0 auto;‘>
            <canvas class="canvas-line" disable-scroll="true" bindtouchstart="canvasTouchStart" bindtouchmove="touchMove" bindtouchend="canvasTouchEnd" canvas-id="canvas"></canvas>
            </view>
            <view class="canvas-btn" bindtap="getLottery">
              <view>
                <view style="font-size:56rpx;color:#fff;padding-bottom:4rpx;">开始</view>
                <view style="font-size:20rpx;color:#6F5942;font-weight:600;">点击抽奖</view>
              </view>
            </view>
          </view>
        </view>

css

.wrapper-content{
  background: #E0CFBC;
  border-radius: 50%;
  width: 720rpx;
  height: 720rpx;
  padding: 40rpx;
  position: relative;
  box-sizing: border-box;
  z-index: 101;
}
.canvas-container ul, .canvas-container li {
  margin: 0;
  padding: 0;
  list-style: none;
}

.canvas-container {
  margin: 0 auto;
  position: absolute;
  left: 40rpx;
  top: 40rpx;
  width: 640rpx;
  height: 640rpx;
  border-radius: 50%;
}
.canvas-container-quiu{
  width: 20rpx;
  height: 20rpx;
  border-radius: 50%;
  position: absolute;
  left:10rpx;
  top: 50%;
  margin-top: -8rpx;
  -webkit-transform-origin: 330rpx 50%;
  transform-origin: 350rpx 50%;
   z-index: 1001;
}
.canvas-content {
  overflow: hidden;
  box-sizing: content-box;
  border: 20rpx solid #CDB193;
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  display: block;
  width: 600rpx;
  height: 600rpx;
  border-radius: inherit;
  background-clip: padding-box;
}
.canvas-btn {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  position: absolute;
  left: 50%;
  top: 50%;
  margin-left: -110rpx;
  margin-top: -110rpx;
  z-index: 400;
  width: 220rpx;
  height: 220rpx;
  border-radius: 50%;
  color: #f4e9cc;
  border: 10px solid #cdb193;
  text-align: center;
  font-size: 40rpx;
  text-decoration: none;
  box-sizing: border-box;
}

.canvas-btn>view {
  position: absolute;
  top: 7%;
  left: 7%;
  width: 86%;
  height: 86%;
  border-radius: 50%;
  box-sizing: border-box;
  padding: 22rpx 20rpx 0;
  background: linear-gradient(134deg, rgba(232, 219, 197, 1) 0%, rgba(205, 177, 147, 1) 100%);
  /* box-shadow:0px 5px 7px 0px rgba(255,255,255,1); */
  margin: auto;
  z-index: 102;
}

.canvas-btn::after {
  position: absolute;
  display: block;
  content: ‘ ‘;
  left: 39%;
  top: -78%;
  width: 0;
  height: 0;
  overflow: hidden;
  border-width: 80rpx 20rpx 80rpx 20rpx;
  border-style: solid;
  border-color: transparent;
  border-bottom-color: #ffab52;
}

var app = getApp()
var utils = require(‘../../utils/utils.js‘);
var Animation = require(‘../../utils/Animation.js‘);
var Wheel = require(‘../../utils/Wheel.js‘);
Page({

  /**
   * 页面的初始数据
   */
  data: {
    awardsList: {},
    list: [],
    statusBarHeight: getApp().globalData.statusBarHeight,
    scrollHeight: 200,
    windowWidth:0,
    windowHeight:0,
    awardsConfig: {
      count: 50,
      slicePrizes: [
        { text: "恭喜中大奖", img: "/assets/coupon_gold.png", title: "积分券x1", num: "1200", x: "1" },
        { text: "医疗服务费", img: "/assets/coupon_gold.png", title: "积分券x1", num: "50", x: "2" },
        { text: "健康保养费", img: "/assets/coupon_gold.png", title: "积分券x1", num: "500", x: "1" },
        { text: "谢谢参与", img: "/assets/coupon_gold.png", title: "积分券x3", num: "0", x: "2" },
        { text: "青春补偿费", img: "/assets/coupon_gold.png", title: "积分券x1", num: "200", x: "1" },
        { text: "感恩奉献费", img: "/assets/coupon_gold.png", title: "积分券x1", num: "100", x: "2" },
        { text: "咨询售后费", img: "/assets/coupon_gold.png", title: "积分券x1", num: "150", x: "1" },
        { text: "谢谢参与", img: "/assets/coupon_gold.png", title: "积分券x1", num: "0", x: "1" }, { text: "咨询售后费", img: "/assets/coupon_gold.png", title: "积分券x1", num: "150", x: "1" },
        { text: "谢谢参与", img: "/assets/coupon_gold.png", title: "积分券x1", num: "0", x: "1" }
      ],
    },
  },
  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function(options) {
    var that = this;
    that.initAdards()
    wx.getSystemInfo({
      success: function (res) {
        that.setData({
          windowWidth: res.windowWidth,
          windowHeight: res.windowHeight,
          scrollHeight: res.windowHeight - res.windowWidth / 750 * (getApp().globalData.statusBarHeight * 2 + 98)
        });
      },
    })
  },
  onReady: function(e) {
    let that = this,
      fps = 60, awardsConfig = that.data.awardsConfig,
        w = this.data.windowWidth / 750 * 600,
        h = this.data.windowWidth / 750 * 600,
        ;
   
    
    wx.getSystemInfo({
      success: function(res) {
        that.setData({
          contentHeight: res.windowHeight
        });
      },
    })
    that.setData({
      count: awardsConfig.count
    })
    let len = awardsConfig.slicePrizes.length,
        rotateDeg = 360 / len / 2 ,
        list = [],
        turnNum = 1 / len;
    for (var i = 0; i < len; i++) {
      list.push({
        award: awardsConfig.slicePrizes[i].text,
      });
    };
    that.setData({
      list: list.concat(list)
    });
  },
//初始化奖品数据 计算角度
  initAdards() {
    var that = this,
      awardsConfig = that.data.awardsConfig;
    var t = awardsConfig.slicePrizes.length; // 选项长度
    var e = 1 / t,
      i = 360 / t,
      r = i - 90;

    for (var g = 0; g < t; g++) {
      awardsConfig.slicePrizes[g].item2Deg = g * i + 90 - i / 2 + "deg"; //当前下标 * 360/长度 + 90 - 360/长度/2
      awardsConfig.slicePrizes[g].afterDeg = r + "deg";
      awardsConfig.slicePrizes[g].opacity = ‘1‘;
    }
    that.setData({
      turnNum: e, // 页面的单位是turn
      awardsConfig: awardsConfig,
    })
  },
  /**
  * 抽奖处理函数：
  */
  getLottery: function () {
    let that = this;
    // 获取奖品配置
    let awardsConfig = that.data.awardsConfig,
      runNum = 12,
      len = awardsConfig.slicePrizes.length,
      awardIndex = 0;
    awardIndex = parseInt(Math.random() * 6)
    console.log("奖品序号：" + awardIndex);
    // 旋转抽奖
    app.runDegs = app.runDegs || 0
    app.runDegs = app.runDegs + (360 - app.runDegs % 360) + (360 * runNum - awardIndex * (360 / len))
    //创建动画
    let animationRun = wx.createAnimation({
      duration: 4000,
      timingFunction: ‘ease‘
    })
    console.log(awardsConfig.slicePrizes[awardIndex]);
    that.animationRun = animationRun
    animationRun.rotate(app.runDegs).step()
    that.setData({
      animationData: animationRun.export()
    })
  },
})

???

小程序大转盘抽奖 canvas animation

码农公寓

创建动画区域 （animation） 动画可参考小程序官方API animationData动画参数 在点击开始的时候填充数据

配合CSS3 扇形实现圆盘

1.awardsConfig.slicePrizes为奖品列表 因为大转盘是圆的 所以W H 是一样的

2.this.data.windowWidth 是屏幕的宽度 小程序有API 可以获取 用屏幕宽度/750*设置内容宽度rpx = 实际内容宽度的px 值

3.size 是圆盘的宽度

设置点击抽奖按钮 两种方法 一直接在canvas内绘制 二在HTML里面通过定位实现

提供二 HTML 定位实现按钮

点击按钮触发getLottery 进行动画数据填充 实现旋转效果 runNum为旋转的圈数 awardIndex为中奖的序号

整体如此完美实现献上整体代码

html

相关文章

创建动画区域（animation）动画可参考小程序官方API animationData动画参数在点击开始的时候填充数据

1.awardsConfig.slicePrizes为奖品列表因为大转盘是圆的所以W H 是一样的

2.this.data.windowWidth 是屏幕的宽度小程序有API 可以获取用屏幕宽度/750*设置内容宽度rpx = 实际内容宽度的px 值

设置点击抽奖按钮两种方法一直接在canvas内绘制二在HTML里面通过定位实现

点击按钮触发getLottery 进行动画数据填充实现旋转效果 runNum为旋转的圈数 awardIndex为中奖的序号