Halcon運算子(總結的很全面)
Halcon語言
輸入控制引數可以是表示式,但圖形引數、輸出引數均應為變數;
String型別變數由單引號’括起來;此外還有一些特殊字元;
Boolean型變數包括 true ( = 1 )、 false ( = 0 ) ;不為零的整數將被認為true;但絕大多數的Halcon函式接受字串型的表達:’true’‘false’,而非邏輯型表達;
函式返回常量用於標識錯誤:
Ø H_MSG_TRUE no error 2
Ø H_MSG_FALSE logical false 3
Ø H_MSG_FAIL operator did not succeed 5
可以放在try…catch…endtry塊中,也可以用
控制語句結構:(與一般語言略有不同,它們也有輸入輸出變數)
Ø if ... endif / if ... else ... endif / if ... elseif ... else ... endif
Ø for ... endfor
Ø while ... endwhile
Ø repeat ... until
此外,也有關鍵字 break、continue、return、exit、stop 用來控制語句的執行;
賦值語句在Halcon中也被當作函式來使用:
標準賦值
Ø assign(Expression, ResultVariable) //編輯形式,永遠都是輸入在前,輸出在後
Ø ResultVariable := Expression //程式碼形式
元組插入賦值
Ø insert(Tuple, NewValue, Index, Tuple) //編輯形式
Ø Tuple[Index] := NewValue //程式碼形式
控制變數元組操作
Ø [t,t] concatenation of tuples
Ø |t| number of elements
Ø t[i] selection of an element
Ø t[i:j] selection of a part of a tuple
Ø subset(t1,t2) selection from t1 by indices in t2
圖形元組操作對應函式
Ø [] gen_empty_obj ()
Ø |t| count_obj (p, num)
Ø [t1,t2] concat_obj (p1, p2, q)
Ø t[i] select_obj (p, q, i+1)
Ø t[i:j] copy_obj (p, q, i+1, j-i+1)
Ø subset(t1,t2) select_obj (p, q, t2+1)
元組的數學運算,如:A * B,令 m = |A|, n = |B|;
若m、n不相等,且都大於1,則錯誤;否則返回三種情況:
Ø m=n=1,返回一個值;
Ø m=n>1,返回一個包含m個數的元組,值為兩元組各對於值的操作結果;
Ø m>1,n=1,返回一個包含m個數的元組,值為第二個數與第一元組各值的操作結果;
Halcon 的數學運算
算術運算
Ø a / a division
Ø a % a rest of the integer division
Ø a * a multiplication
Ø v + v addition and concatenation of strings
Ø a - a subtraction
Ø -a negation
位運算
Ø lsh(i,i) left shift
Ø rsh(i,i) right shift
Ø i band i bit-wise and
Ø i bor i bit-wise or
Ø i bxor i bit-wise xor
Ø bnot i bit-wise complement
字串操作
Ø v$s conversion to string //字串的格式化,有很豐富的引數
Ø v + v concatenation of strings and addition
Ø strchr(s,s) search character in string
Ø strstr(s,s) search substring
Ø strrchr(s,s) search character in string (reverse)
Ø strrstr(s,s) search substring (reverse)
Ø strlen(s) length of string
Ø s{i} selection of one character
Ø s{i:i} selection of substring
Ø split(s,s) splitting to substrings
比較操作符
Ø t < t less than
Ø t > t greater than
Ø t <= t less or equal
Ø t >= t greater or equal
Ø t = t equal
Ø t # t not equal
邏輯操作符
Ø not l negation
Ø l and l logical ’and’
Ø l or l logical ’or’
Ø l xor l logical ’xor’
數學函式
Ø sin(a) sine of a
Ø cos(a) cosine of a
Ø tan(a) tangent of a
Ø asin(a) arc sine of a in the interval [-p/2, p/ 2], a Î [-1, 1]
Ø acos(a) arc cosine a in the interval [-p/2, p/2], a Î [-1, 1]
Ø atan(a) arc tangent a in the interval [-p/2, p/2], a Î [-1, 1]
Ø atan2(a,b) arc tangent a/b in the interval [-p, p]
Ø sinh(a) hyperbolic sine of a
Ø cosh(a) hyperbolic cosine of a
Ø tanh(a) hyperbolic tangent of a
Ø exp(a) exponential function
Ø log(a) natural logarithm, a> 0
Ø log10(a) decade logarithm, a> 0
Ø pow(a1,a2) power
Ø ldexp(a1,a2) a1 pow(2,a2)
其他操作(統計、隨機數、符號函式等)
Ø min(t) minimum value of the tuple
Ø max(t) maximum value of the tuple
Ø min2(t1,t2) element-wise minimum of two tuples
Ø max2(t1,t2) element-wise maximum of two tuples
Ø find(t1,t2) indices of all occurrences of t1 within t2
Ø rand(i) create random values from 0..1 (number specified by i)
Ø sgn(a) element-wise sign of a tuple
Ø sum(t) sum of all elements or string concatenation
Ø cumul(t) cumulative histogram of a tuple
Ø mean(a) mean value
Ø deviation(a) standard deviation
Ø sqrt(a) square root of a
Ø deg(a) convert radians to degrees
Ø rad(a) convert degrees to radians
Ø real(a) convert integer to real
Ø int(a) convert a real to integer
Ø round(a) convert real to integer
Ø number(v) convert string to a number
Ø is_number(v) test if value is a number
Ø abs(a) absolute value of a (integer or real)
Ø fabs(a) absolute value of a (always real)
Ø ceil(a) smallest integer value not smaller than a
Ø floor(a) largest integer value not greater than a
Ø fmod(a1,a2) fractional part of a1/a2, with the same sign as a1
Ø sort(t) sorting in increasing order
Ø uniq(t) eliminate duplicates of neighboring values(typically used in combination with sort)
Ø sort_index(t) return index instead of values
Ø median(t) Median value of a tuple (numbers)
Ø select_rank(t,v) Select the element (number) with the given rank
Ø inverse(t) reverse the order of the values
Ø subset(t1,t2) selection from t1 by indices in t2
Ø remove(t1,t2) Remove of values with the given indices
Ø environment(s) value of an environment variable
Ø ord(a) ASCII number of a character
Ø chr(a) convert an ASCII number to a character
Ø ords(s) ASCII number of a tuple of strings
Ø chrt(i) convert a tuple of integers into a string