intersectionintersectionIntersectionIntersectionintersection (算子)

名称

intersectionintersectionIntersectionIntersectionintersection — 计算两个区域的交集。

签名

描述

intersectionintersectionIntersectionIntersectionIntersectionintersection calculates the intersection of the regions in Region1Region1Region1Region1region1region_1 with the regions in Region2Region2Region2Region2region2region_2. Each region in Region1Region1Region1Region1region1region_1 is intersected with all regions in Region2Region2Region2Region2region2region_2. That is, internally all regions of Region2Region2Region2Region2region2region_2 are united to a single region before the individual regions of Region1Region1Region1Region1region1region_1 are intersected with the united region. The order of regions in RegionIntersectionRegionIntersectionRegionIntersectionRegionIntersectionregionIntersectionregion_intersection is identical to the order of regions in Region1Region1Region1Region1region1region_1。

注意

Empty input regions are permitted. Because empty result regions are possible, the system flag 'store_empty_region'"store_empty_region""store_empty_region""store_empty_region""store_empty_region""store_empty_region" should be set appropriately.

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 N be the number of regions in Region1Region1Region1Region1region1region_1, be their average area, and be the total area of all regions in Region2Region2Region2Region2region2region_2. Then the runtime complexity is 。

结果

intersectionintersectionIntersectionIntersectionIntersectionintersection 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

另见

union1union1Union1Union1Union1union1, union2union2Union2Union2Union2union2, complementcomplementComplementComplementComplementcomplement

模块

基础