demo_openlayers's Introduction

openlayers

ol常用业务demo
demo目录在src_webapp/modules/
【路径规划】可读本案例详解here
【交通热力】可读本案例详解here
【显示策略】思路

当前层级<设置的层级
zoom<zoom_set:数据由后台进行抽稀数据；

当前层级>设置的层级
zoom>zoom_set:由屏幕角点进行拿到数据，其他区域不显示数据；

页面分为三个定时器全部开启
1.宏观获取数据的定时器，一直在获取数据。设计到闭包；
2.宏观数据的渲染，数据的请求这层体验不会影响到渲染这里；
3.微观数据的实时请求，只有在层级达到时才开始拿数据进行渲染；

【模型构建】思路

1.三生成第一个三角形模型；
2.下一个点，对应整个模型（所有的三角形），每个三角形模型都可以拿到三组新生成的数组；
3.比较所有数组重复的次数
4.拿到重复次数最好，狭长比例最小的三角形；

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