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class GestureLock {
constructor(containerWidth, cycleRadius) {
this.containerWidth = containerWidth; // 容器宽度
this.cycleRadius = cycleRadius; // 圆的半径
this.circleArray = []; // 全部圆的对象数组
this.checkPoints = []; // 选中的圆的对象数组
this.lineArray = []; // 已激活锁之间的线段数组
this.lastCheckPoint = 0; // 最后一个激活的锁
this.offsetX = 0; // 容器的 X 偏移
this.offsetY = 0; // 容器的 Y 偏移
this.activeLine = {}; // 最后一个激活的锁与当前位置之间的线段
this.windowWidth = wx.getSystemInfoSync().windowWidth; // 窗口大小(用于rpx 和 px 转换)
this.initCircleArray();
}
// 初始化 画布上的 9个圆
initCircleArray() {
const cycleMargin = (this.containerWidth - 6 * this.cycleRadius) / 6;
let count = 0;
for (let i = 0; i < 3; i++) {
for (let j = 0; j < 3; j++) {
count++;
this.circleArray.push({
count: count,
x: this.rpxTopx((cycleMargin + this.cycleRadius) * (j * 2 + 1)),
y: this.rpxTopx((cycleMargin + this.cycleRadius) * (i * 2 + 1)),
radius: this.rpxTopx(this.cycleRadius),
check: false,
style: {
left: (cycleMargin + this.cycleRadius) * (j * 2 + 1) - this.cycleRadius + 'rpx',
top: (cycleMargin + this.cycleRadius) * (i * 2 + 1) - this.cycleRadius + 'rpx',
width: this.cycleRadius * 2 + 'rpx',
}
});
}
}
}
onTouchStart(e) {
this.setOffset(e);
this.checkTouch({
x: e.touches[0].pageX - this.offsetX,
y: e.touches[0].pageY - this.offsetY
});
}
onTouchMove(e) {
this.moveDraw(e)
}
onTouchEnd(e) {
const checkPoints = this.checkPoints;
this.reset();
return checkPoints;
}
// 初始化 偏移量
setOffset(e) {
this.offsetX = e.currentTarget.offsetLeft;
this.offsetY = e.currentTarget.offsetTop;
}
// 检测当时 触摸位置是否位于 锁上
checkTouch({
x,
y
}) {
for (let i = 0; i < this.circleArray.length; i++) {
let point = this.circleArray[i];
if (this.isPointInCycle(x, y, point.x, point.y, point.radius)) {
if (!point.check) {
this.checkPoints.push(point.count);
if (this.lastCheckPoint != 0) {
// 已激活锁之间的线段
const line = this.drawLine(this.lastCheckPoint, point);
this.lineArray.push(line);
}
this.lastCheckPoint = point;
}
point.check = true;
return;
}
}
}
// 画线 - 返回 样式 对象
drawLine(start, end) {
const width = this.getPointDis(start.x, start.y, end.x, end.y);
const rotate = this.getAngle(start, end);
return {
activeLeft: start.x + 'px',
activeTop: start.y + 'px',
activeWidth: width + 'px',
activeRotate: rotate + 'deg'
}
}
// 获取 画线的 角度
getAngle(start, end) {
var diff_x = end.x - start.x,
diff_y = end.y - start.y;
if (diff_x >= 0) {
return 360 * Math.atan(diff_y / diff_x) / (2 * Math.PI);
} else {
return 180 + 360 * Math.atan(diff_y / diff_x) / (2 * Math.PI);
}
}
// 判断 当前点是否位于 锁内
isPointInCycle(x, y, circleX, circleY, radius) {
return (this.getPointDis(x, y, circleX, circleY) < radius) ? true : false;
}
// 获取两点之间距离
getPointDis(ax, ay, bx, by) {
return Math.sqrt(Math.pow(ax - bx, 2) + Math.pow(ay - by, 2));
}
// 移动 绘制
moveDraw(e) {
// 画经过的圆
const x = e.touches[0].pageX - this.offsetX;
const y = e.touches[0].pageY - this.offsetY;
this.checkTouch({
x,
y
});
// 画 最后一个激活的锁与当前位置之间的线段
this.activeLine = this.drawLine(this.lastCheckPoint, {
x,
y
});
}
// 使 画布 恢复初始状态
reset() {
this.circleArray.forEach((item) => {
item.check = false;
});
this.checkPoints = [];
this.lineArray = [];
this.activeLine = {};
this.lastCheckPoint = 0;
}
// 获取 最后一个激活的锁与当前位置之间的线段
getActiveLine() {
return this.activeLine;
}
// 获取 圆对象数组
getCycleArray() {
return this.circleArray;
}
// 获取 已激活锁之间的线段
getLineArray() {
return this.lineArray;
}
// 将 RPX 转换成 PX
rpxTopx(rpx) {
return rpx / 750 * this.windowWidth;
}
}
export default GestureLock;