union2union2Union2Union2union2 (算子)

名称

union2union2Union2Union2union2 — 返回两个区域的并集。

签名

描述

union2union2Union2Union2Union2union2 computes the union of the region in Region1Region1Region1Region1region1region_1 with all regions in Region2Region2Region2Region2region2region_2. Internally, all regions of Region2Region2Region2Region2region2region_2 are united to a single region before the individual regions of Region1Region1Region1Region1region1region_1 are united with the already united region. This means that union2union2Union2Union2Union2union2 is not commutative!

执行信息

• 多线程类型：可重入（与非独占算子并行运行）。
• 多线程作用域：全局（可从任何线程调用）。
• 未采用并行化处理。

参数

复杂度

Let F be the sum of all areas of the input regions. Then the runtime complexity is O(log(sqrt(F)) * sqrt(F)).

结果

union2union2Union2Union2Union2union2 始终返回 2 ( H_MSG_TRUE )。当输入为空（未指定区域）时则可设置行为通过 set_system('no_object_result',<Result>)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)set_system("no_object_result",<Result>) 以及输入区域为空时可设置行为通过 set_system('empty_region_result',<Result>)set_system("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)set_system("empty_region_result",<Result>)。如有必要，则抛出异常。

可能的前趋

thresholdthresholdThresholdThresholdThresholdthreshold, connectionconnectionConnectionConnectionConnectionconnection, regiongrowingregiongrowingRegiongrowingRegiongrowingRegiongrowingregiongrowing, pouringpouringPouringPouringPouringpouring

可能的后继

select_shapeselect_shapeSelectShapeSelectShapeSelectShapeselect_shape, disp_regiondisp_regionDispRegionDispRegionDispRegiondisp_region

替代

union1union1Union1Union1Union1union1

另见

intersectionintersectionIntersectionIntersectionIntersectionintersection, complementcomplementComplementComplementComplementcomplement

模块

基础