微信小程序开发中关于手势解锁的全面介绍

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 < n; i++) {

    for (let j = 0; j < n; j++){

      count++;

      let touchPoint = {

        x: this.marge + i * (this.radius * 2 + this.margeCircle) + this.radius,

        y: this.marge + j * (this.radius * 2 + this.margeCircle) + this.radius,

        index: count,

        check: "uncheck",

      }

      this.touchPoints.push(touchPoint)

    }

  }

}

for (let i = 0; i < this.touchPoints.length; i++){

   this.drawCircle(this.touchPoints[i].x, this.touchPoints[i].y, this.radius, this.initColor)

}

this.ctx.draw(true);

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 < this.touchPoints.length; i++){

    let point = this.touchPoints[i];

    if (isPointInCycle(e.touches[0].x, e.touches[0].y, point.x, point.y, this.radius)) {

      if (point.check === 'uncheck') {

        this.checkPoints.push(point);

        this.lastCheckPoint = point;

      }

      point.check = "check"

      return;

    }

  }

}

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 < this.touchPoints.length; i++){

    let point = this.touchPoints[i];

    if (point.check === "check") {

      this.drawCircle(point.x, point.y, this.radius, color);

      this.drawCircleCentre(point.x, point.y, color);

    }

    else {

      this.drawCircle(this.touchPoints[i].x, this.touchPoints[i].y, this.radius, this.initColor)

    }

  }

  //绘制已识别锁之间的线段

  if (this.checkPoints.length > 1) {

     let lastPoint = this.checkPoints[0];

     for (let i = 1; i < this.checkPoints.length; i++) {

       this.drawLine(lastPoint, this.checkPoints[i], color);

       lastPoint = this.checkPoints[i];

     }

  }

  //绘制最后一个识别锁和当前触摸点之间的线段

  if (this.lastCheckPoint && point) {

    this.drawLine(this.lastCheckPoint, point, color);

  }

  this.ctx.draw(true);

}

onTouchEnd(e) {

  typeof this.onEnd === 'function' && this.onEnd(this.checkPoints, false);

}

onTouchCancel(e) {

  typeof this.onEnd === 'function' && this.onEnd(this.checkPoints, true);

}

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);

}