微信小程序开发教程-手势解锁实例

.gesture-lock {
  margin: 100rpx auto;
  width: 300px;
  height: 300px;
  background-color: #ffffff;
}

  constructor(canvasid, context, cb, opt){
    this.touchPoints = [];
    this.checkPoints = [];
    this.canvasid = canvasid;
    this.ctx = context;
    this.width = opt && opt.width || 300; //画布长度
    this.height = opt && opt.height || 300; //画布宽度
    this.cycleNum = opt && opt.cycleNum || 3;
    this.radius = 0; //触摸点半径
    this.isParamOk = false;
    this.marge = this.margeCircle = 25; //触摸点及触摸点和画布边界间隔
    this.initColor = opt && opt.initColor || '#C5C5C3';  
    this.checkColor = opt && opt.checkColor || '#5AA9EC';
    this.errorColor = opt && opt.errorColor || '#e19984';
    this.touchState = "unTouch";
    this.checkParam();
    this.lastCheckPoint = null;
    if (this.isParamOk) {
      // 计算触摸点的半径长度
      this.radius = (this.width - this.marge * 2 - (this.margeCircle * (this.cycleNum - 1))) / (this.cycleNum * 2)
      this.radius = Math.floor(this.radius);
      // 计算每个触摸点的圆心位置
      this.calCircleParams();
    }
    this.OnEnd= cb; //滑动手势结束时的回调函数
  }

  calCircleParams() {
    let n = this.cycleNum;
    let count = 0;
    for (let i = 0; i 

   for (let i = 0; i 

  onTouchStart(e) {
    // 不识别多点触控
    if (e.touches.length > 1){
      this.touchState = "unTouch";
      return;
    }
    this.touchState = "startTouch";
    this.checkTouch(e);
    let point = {x:e.touches[0].x, y:e.touches[0].y};
    this.drawCanvas(this.checkColor, point);
  }

  onTouchMove(e) {
    if (e.touchState === "unTouch") {
      return;
    }
    if (e.touches.length > 1){
      this.touchState = "unTouch";
      return;
    }
    this.checkTouch(e);
    let point = {x:e.touches[0].x, y:e.touches[0].y};
    this.drawCanvas(this.checkColor, point);
  }

  checkTouch(e) {
    for (let i = 0; i 

   drawCanvas(color, point) {
    //每次更新之前先清空画布
    this.ctx.clearRect(0, 0, this.width, this.height);
    //使用不同颜色和形式绘制已触发和未触发的锁
    for (let i = 0; i  1) {
       let lastPoint = this.checkPoints[0];
       for (let i = 1; i 

  onTouchEnd(e) {
    typeof this.OnEnd=== 'function' && this.onEnd(this.checkPoints, false);
  }

  onTouchCancel(e) {
    typeof this.OnEnd=== 'function' && this.onEnd(this.checkPoints, true);
  }

  gestureError() {
    this.drawCanvas(this.errorColor)
  }

  reset() {
    for (let i = 0; i 

 onLoad: function () {
  var s = this;
  this.lock = new Lock("id-gesture-lock", wx.createCanvasContext("id-gesture-lock"), function(checkPoints, isCancel) {
   console.log('over');
   s.lock.gestureError();
   setTimeout(function() {
    s.lock.reset();
   }, 1000);
  }, {width:300, height:300})
  this.lock.drawGestureLock();
  console.log('onLoad')
  var that = this
  //调用应用实例的方法获取全局数据
  app.getUserInfo(function(userInfo){
   //更新数据
   that.setData({
    userInfo:userInfo
   })
   that.update()
  })
 },
 onTouchStart: function (e) {
  this.lock.onTouchStart(e);
 },
 onTouchMove: function (e) {
  this.lock.onTouchMove(e);
 },
 onTouchEnd: function (e) {
  this.lock.onTouchEnd(e);
 }