WeChat applet development gesture unlock code example

Gesture unlocking is a common unlocking method on the app, and it is much more convenient to operate than entering a password. The following shows how to unlock the phone based on the WeChat applet. The final effect is as follows:

Gesture unlock

The entire function is based on canvas. First add the canvas component and set the style.

<!--index.wxml-->
<view class="container">
  <canvas canvas-id="id-gesture-lock" class="gesture-lock" bindtouchstart="onTouchStart"
    bindtouchmove="onTouchMove" bindtouchend="onTouchEnd"></canvas>
</view>

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

The gesture unlock implementation code is in gesture_lock.js (see the end for the complete source code address).

Initialization

    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
    }

Mainly set some parameters, such as the length and width of the canvas, the context of the canvas, the number of gesture locks (3 times 3, 4 times 4), The color of the gesture lock, the callback function when the gesture slide ends, etc. And calculate the radius of the gesture lock.

Calculate the center position of each gesture lock

    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)
            }
        }
    }

Draw the gesture lock

     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);

The next step is to recognize the user's swipe Behavior, determine which circles the user has crossed, and then identify the user's gestures.

Detect triggering and update the canvas in touchstart and touchmove events

<p style="margin-bottom: 7px; margin-top: 14px;">   onTouchStart(e) {<br/>        // 不识别多点触控<br/>        if (e.touches.length > 1){<br/>            this.touchState = "unTouch";<br/>            return;<br/>        }<br/>        this.touchState = "startTouch";<br/>        this.checkTouch(e);<br/>        let point = {x:e.touches[0].x, y:e.touches[0].y};<br/>        this.drawCanvas(this.checkColor, point);<br/>    }<br/><br/>    onTouchMove(e) {<br/>        if (e.touchState === "unTouch") {<br/>            return;<br/>        }<br/>        if (e.touches.length > 1){<br/>            this.touchState = "unTouch";<br/>            return;<br/>        }<br/>        this.checkTouch(e);<br/>        let point = {x:e.touches[0].x, y:e.touches[0].y};<br/>        this.drawCanvas(this.checkColor, point);<br/>    }<br/></p>

Detect whether the user has touched A certain circle

    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 === &#39;uncheck&#39;) {
                    this.checkPoints.push(point);
                    this.lastCheckPoint = point;
                }
                point.check = "check"
                return;
            }
        }
    }

Update canvas

     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);
    }

Called the callback function when the user's swipe ends and passes the recognized gesture

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

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

Reset and display gesture error

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

    reset() {
        for (let i = 0; i < this.touchPoints.length; i++) {
            this.touchPoints[i].check = &#39;uncheck&#39;;
        }
        this.checkPoints = [];
        this.lastCheckPoint = null;
        this.drawCanvas(this.initColor);
    }

How to call
Create the lock object in the onload method and call the corresponding in the user touch event Method

  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);
  }

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