Halcon算子翻译——while

名称

while - 只要条件为真就开始一次循环分段运行。

用法

while( : : Condition : )

描述

　　只要Condition参数的值为'true'（或者数字不等于0），while就会循环运行相应的endwhile语句内的循环体。

　　如果Condition判定为'false'（0），则程序在相应的endwhile语句之后继续运行。

参数

Condition (input_control) integer → (integer)
　　循环的条件

示例（HDevelop）

dev_update_window ('off')
dev_close_window ()
dev_open_window (0, 0, 512, 512, 'black', WindowID)
read_image (Image, 'particle')
dev_display (Image)
stop ()
threshold (Image, Large, 110, 255)
dilation_circle (Large, LargeDilation, 7.5)
dev_display (Image)
dev_set_draw ('margin')
dev_set_line_width (3)
dev_set_color ('green')
dev_display (LargeDilation)
dev_set_draw ('fill')
stop ()
complement (LargeDilation, NotLarge)
reduce_domain (Image, NotLarge, ParticlesRed)
mean_image (ParticlesRed, Mean, 31, 31)
dyn_threshold (ParticlesRed, Mean, SmallRaw, 3, 'light')
opening_circle (SmallRaw, Small, 2.5)
connection (Small, SmallConnection)
dev_display (Image)
dev_set_colored (12)
dev_display (SmallConnection)
stop ()
dev_set_color ('green')
dev_display (Image)
dev_display (SmallConnection)
Button := 1
while (Button == 1)
  dev_set_color ('green')
  get_mbutton (WindowID, Row, Column, Button)
  dev_display (Image)
  dev_display (SmallConnection)
  dev_set_color ('red')
  select_region_point (SmallConnection, SmallSingle, Row, Column)
  dev_display (SmallSingle)
  NumSingle := |SmallSingle|
  if (NumSingle == 1)
    intensity (SmallSingle, Image, MeanGray, DeviationGray)
    area_center (SmallSingle, Area, Row, Column)
    dev_set_color ('yellow')
    set_tposition (WindowID, Row, Column)
    write_string (WindowID, 'Area='+Area+', Int='+MeanGray)
  endif
endwhile
dev_set_line_width (1)
dev_update_window ('on')

结果

如果指定参数的值正确，while（作为算子）返回2（H_MSG_TRUE）。 否则会引发异常并返回错误代码。

备选算子

for, until

See also

repeat, break, continue, if, elseif, else

模块

Foundation

HDevelop例程

while.hdev 　　　　 Use a while loop to provide interaction until right mouse button is clicked