附录 B（规范性）Type 4 函数中的操作符

Annex B (normative) Operators in Type 4 Functions

B.1 概述

B.1 General

中文英文

本附件总结了可能出现在类型 4 函数中的 PostScript 运算符，如 7.10.5“类型 4（PostScript 计算器）函数”中所述。有关这些运算符的详细信息，请参阅《PostScript 语言参考》第三版。

This annex summarizes the PostScript operators that may appear in a type 4 function, as discussed in 7.10.5, "Type 4 (PostScript Calculator) Functions". For details on these operators, see the PostScript Language Reference, Third Edition.

B.2 算术操作符

B.2 Arithmetic Operators

中文英文

${\text{num}}_1{\text{num}}_2$	add sum	返回 ${\text{num}}_1$ 加 ${\text{num}}_2$
${\text{num}}_1{\text{num}}_2$	sub difference	返回 ${\text{num}}_1$ 减 ${\text{num}}_2$
${\text{num}}_1{\text{num}}_2$	mul product	返回 ${\text{num}}_1$ 乘以 ${\text{num}}_2$
${\text{num}}_1{\text{num}}_2$	div 商	返回 ${\text{num}}_1$ 除以 ${\text{num}}_2$
${\text{int}}_1{\text{int}}_2$	idiv 商	返回 int1 除以 int2 后的整数
${\text{int}}_1{\text{int}}_2$	mod 余数	返回 int1 除以 int2 后的余数
${\text{num}}_1$	neg ${\text{num}}_2$	返回${\text{num}}_1$ 的负数
${\text{num}}_1$	abs ${\text{num}}_2$	返回 ${\text{num}}_1$ 的绝对值
${\text{num}}_1$	ceiling ${\text{num}}_2$	返回 ${\text{num}}_1$ 的上限
${\text{num}}_1$	floor ${\text{num}}_2$	返回 ${\text{num}}_1$ 的下限
${\text{num}}_1$	round ${\text{num}}_2$	将 ${\text{num}}_1$ 返回为最接近的整数
${\text{num}}_1$	truncate ${\text{num}}_2$	删除 ${\text{num}}_1$ 的小数部分
$\text{num}$	sqrt ${\text{num}}_2$	返回 num 的平方根
num	sqrt real	返回 num 的平方根
angle	sin real	返回角度的正弦度
角度	cos real	返回角度的余弦度
num den	atan angle	返回 num/den 的反正切度
base exponent	exp real	将底数提升为指数幂
num	ln real	返回自然对数（底数为 e）
num	log real	返回常用对数（底数为10)
num	cvi int	转换为整数
num	cvr real	转换为实数

${\text{num}}_1{\text{num}}_2$	add sum	Return ${\text{num}}_1$ plus ${\text{num}}_2$
${\text{num}}_1{\text{num}}_2$	sub difference	Return ${\text{num}}_1$ minus ${\text{num}}_2$
${\text{num}}_1{\text{num}}_2$	mul product	Return ${\text{num}}_1$ times ${\text{num}}_2$
${\text{num}}_1{\text{num}}_2$	div quotient	Return ${\text{num}}_1$ divided by ${\text{num}}_2$
${\text{int}}_1{\text{int}}_2$	idiv quotient	Return int1 divided by int2 as an integer
${\text{int}}_1{\text{int}}_2$	mod remainder	Return remainder after dividing int1 by int2
${\text{num}}_1$	neg ${\text{num}}_2$	Return negative of ${\text{num}}_1$
${\text{num}}_1$	abs ${\text{num}}_2$	Return absolute of ${\text{num}}_1$
${\text{num}}_1$	ceiling ${\text{num}}_2$	Return ceiling of ${\text{num}}_1$
${\text{num}}_1$	floor ${\text{num}}_2$	Return floor of ${\text{num}}_1$
${\text{num}}_1$	round ${\text{num}}_2$	Return ${\text{num}}_1$ to nearest integer
${\text{num}}_1$	truncate ${\text{num}}_2$	Remove fractional part of ${\text{num}}_1$
$\text{num}$	sqrt ${\text{num}}_2$	Return square root of num
num	sqrt real	Return square root of num
angle	sin real	Return sine of angle degrees
angle	cos real	Return cosine of angle degrees
num den	atan angle	Return arc tangent of num/den in degrees
base exponent	exp real	Raise base to exponent power
num	ln real	Return natural logarithm (base e)
num	log real	Return common logarithm (base 10)
num	cvi int	Convert to integer
num	cvr real	Convert to real

B.3 关系、布尔和位操作符

B.3 Relational, Boolean, and Bitwise Operators

中文英文

${\text{any}}_1{\text{any}}_2$	eq bool	测试相等
${\text{any}}_1{\text{any}}_2$	ne bool	测试不相等
${\text{num}}_1{\text{num}}_2$	gt bool	测试大于
${\text{num}}_1{\text{num}}_2$	ge bool	测试大于或相等
${\text{num}}_1{\text{num}}_2$	lt bool	测试小于
${\text{num}}_1{\text{num}}_2$	le bool	测试小于或等于
${\text{bool}}_1|in{t}_{1}boo{l}_2|{\text{int}}_2$	and ${\text{bool}}_3|{\text{int}}_3$	执行逻辑 | 按位与
${\text{bool}}_1|in{t}_{1}boo{l}_2|{\text{int}}_2$	或 ${\text{bool}}_3|{\text{int}}_3$	执行逻辑 | 按位包含或
${\text{bool}}_1|in{t}_{1}boo{l}_2|{\text{int}}_2$	xor ${\text{bool}}_3|{\text{int}}_3$	执行逻辑 | 按位排他或
${\text{bool}}_1|in{t}_1$	非 ${\text{bool}}_2|{\text{int}}_2$	执行逻辑 | 按位非
${\text{int}}_{1}shift$	bitshift ${\text{int}}_2$	执行 ${\text{int}}_1$ 的按位移位（正数为左移）
–	true true	返回布尔值 true
–	false false	返回布尔值 false

${\text{any}}_1{\text{any}}_2$	eq bool	Test equal
${\text{any}}_1{\text{any}}_2$	ne bool	Test not equal
${\text{num}}_1{\text{num}}_2$	gt bool	Test greater than
${\text{num}}_1{\text{num}}_2$	ge bool	Test greater than or equal
${\text{num}}_1{\text{num}}_2$	lt bool	Test less than
${\text{num}}_1{\text{num}}_2$	le bool	Test less than or equal
${\text{bool}}_1|in{t}_{1}boo{l}_2|{\text{int}}_2$	and ${\text{bool}}_3|{\text{int}}_3$	Perform logical | bitwise and
${\text{bool}}_1|in{t}_{1}boo{l}_2|{\text{int}}_2$	or ${\text{bool}}_3|{\text{int}}_3$	Perform logical | bitwise inclusive or
${\text{bool}}_1|in{t}_{1}boo{l}_2|{\text{int}}_2$	xor ${\text{bool}}_3|{\text{int}}_3$	Perform logical | bitwise exclusive or
${\text{bool}}_1|in{t}_1$	not ${\text{bool}}_2|{\text{int}}_2$	Perform logical | bitwise not
${\text{int}}_{1}shift$	bitshift ${\text{int}}_2$	Perform bitwise shift of ${\text{int}}_1$ (positive is left)
–	true true	Return boolean value true
–	false false	Return boolean value false

B.4 条件操作符

B.4 Conditional Operators

中文英文

bool { expr }	if –	如果 bool 为 true，则执行 expr
bool { ${\text{expr}}_1$ } { ${\text{expr}}_2$ }	ifelse –	如果 bool 为 true，则执行 expr1，如果为 false，则执行 expr2

bool { expr }	if –	Execute expr if bool is true
bool { ${\text{expr}}_1$ } { ${\text{expr}}_2$ }	ifelse –	Execute expr1 if bool is true, expr2 if false

B.5 栈操作符

B.5 Stack Operators

中文英文

any	pop –	丢弃顶部元素
${\text{any}}_1{\text{any}}_2$	exch ${\text{any}}_{2}an{y}_1$	交换顶部两个元素
any	dup any any	复制顶部元素
${\text{any}}_1\dots an{y}_{n}n$	copy ${\text{any}}_1\dots an{y}_{n}an{y}_1\dots an{y}_n$	复制顶部 n元素
${\text{any}}_n\dots an{y}_{0}n$	index ${\text{any}}_n\dots an{y}_{0}an{y}_n$	重复任意元素
${\text{any}}_{n-1}\dots an{y}_{0}nj$	roll ${\text{any}}_{(j-1)modn}\dots an{y}_{0}an{y}_{n-1}\dots an{y}_{jmodn}$	cccc

any	pop –	Discard top element
${\text{any}}_1{\text{any}}_2$	exch ${\text{any}}_{2}an{y}_1$	Exchange top two elements
any	dup any any	Duplicate top element
${\text{any}}_1\dots an{y}_{n}n$	copy ${\text{any}}_1\dots an{y}_{n}an{y}_1\dots an{y}_n$	Duplicate top n elements
${\text{any}}_n\dots an{y}_{0}n$	index ${\text{any}}_n\dots an{y}_{0}an{y}_n$	Duplicate arbitrary element
${\text{any}}_{n-1}\dots an{y}_{0}nj$	roll ${\text{any}}_{(j-1)modn}\dots an{y}_{0}an{y}_{n-1}\dots an{y}_{jmodn}$	cccc