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app.js
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app.js
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//app.js
App({
onLaunch () {
// 展示本地存储能力
var logs = wx.getStorageSync('logs') || []
logs.unshift(Date.now())
wx.setStorageSync('logs', logs)
this.screenSize();
// 登录
wx.login({
success: res => {
// 发送 res.code 到后台换取 openId, sessionKey, unionId
}
})
// 获取用户信息
wx.getSetting({
success: res => {
if (res.authSetting['scope.userInfo']) {
// 已经授权,可以直接调用 getUserInfo 获取头像昵称,不会弹框
wx.getUserInfo({
success: res => {
// 可以将 res 发送给后台解码出 unionId
this.globalData.userInfo = res.userInfo
// 由于 getUserInfo 是网络请求,可能会在 Page.onLoad 之后才返回
// 所以此处加入 callback 以防止这种情况
if (this.userInfoReadyCallback) {
this.userInfoReadyCallback(res)
}
}
})
}
}
}),
wx.getStorage({
key: 'userInfo',
success: (res) => {
if (res.data) {
this.globalData.userInfo = res.data
this.globalData.hasUserInfo = true
}
}
})
},
screenSize () {
var that = this;
// 获取屏幕宽高
wx.getSystemInfo({
success(res) {
var ww = res.windowWidth;
var hh = res.windowHeight;
that.globalData.ww = ww;
that.globalData.hh = hh;
}
})
},
bezier (points, times) {
// 0、以3个控制点为例,点A,B,C,AB上设置点D,BC上设置点E,DE连线上设置点F,则最终的贝塞尔曲线是点F的坐标轨迹。
// 1、计算相邻控制点间距。
// 2、根据完成时间,计算每次执行时D在AB方向上移动的距离,E在BC方向上移动的距离。
// 3、时间每递增100ms,则D,E在指定方向上发生位移, F在DE上的位移则可通过AD/AB = DF/DE得出。
// 4、根据DE的正余弦值和DE的值计算出F的坐标。
// 邻控制AB点间距
var bezier_points = [];
var points_D = [];
var points_E = [];
const DIST_AB = Math.sqrt(Math.pow(points[1]['x'] - points[0]['x'], 2) + Math.pow(points[1]['y'] - points[0]['y'], 2));
// 邻控制BC点间距
const DIST_BC = Math.sqrt(Math.pow(points[2]['x'] - points[1]['x'], 2) + Math.pow(points[2]['y'] - points[1]['y'], 2));
// D每次在AB方向上移动的距离
const EACH_MOVE_AD = DIST_AB / times;
// E每次在BC方向上移动的距离
const EACH_MOVE_BE = DIST_BC / times;
// 点AB的正切
const TAN_AB = (points[1]['y'] - points[0]['y']) / (points[1]['x'] - points[0]['x']);
// 点BC的正切
const TAN_BC = (points[2]['y'] - points[1]['y']) / (points[2]['x'] - points[1]['x']);
// 点AB的弧度值
const RADIUS_AB = Math.atan(TAN_AB);
// 点BC的弧度值
const RADIUS_BC = Math.atan(TAN_BC);
// 每次执行
for (var i = 1; i <= times; i++) {
// AD的距离
var dist_AD = EACH_MOVE_AD * i;
// BE的距离
var dist_BE = EACH_MOVE_BE * i;
// D点的坐标
var point_D = {};
point_D['x'] = dist_AD * Math.cos(RADIUS_AB) + points[0]['x'];
point_D['y'] = dist_AD * Math.sin(RADIUS_AB) + points[0]['y'];
points_D.push(point_D);
// E点的坐标
var point_E = {};
point_E['x'] = dist_BE * Math.cos(RADIUS_BC) + points[1]['x'];
point_E['y'] = dist_BE * Math.sin(RADIUS_BC) + points[1]['y'];
points_E.push(point_E);
// 此时线段DE的正切值
var tan_DE = (point_E['y'] - point_D['y']) / (point_E['x'] - point_D['x']);
// tan_DE的弧度值
var radius_DE = Math.atan(tan_DE);
// 地市DE的间距
var dist_DE = Math.sqrt(Math.pow((point_E['x'] - point_D['x']), 2) + Math.pow((point_E['y'] - point_D['y']), 2));
// 此时DF的距离
var dist_DF = (dist_AD / DIST_AB) * dist_DE;
// 此时DF点的坐标
var point_F = {};
point_F['x'] = dist_DF * Math.cos(radius_DE) + point_D['x'];
point_F['y'] = dist_DF * Math.sin(radius_DE) + point_D['y'];
bezier_points.push(point_F);
}
return {
'bezier_points': bezier_points
};
},
globalData: {
userInfo: null,
hasUserInfo: false
}
})