控制#
简介#
The Control blocks in VEXcode AIM manage the flow of a project by handling loops, conditions, and delaying blocks from running.
A loop is when a computer repeats the same step or group of steps over and over until it is told to stop. A condition is a rule the computer checks to decide what to do next. For example, a robot can move forward if a sensor detects an object.
以下是可用指令块的列表：
wait — Pauses blocks from running for a specific duration.
wait until — Pauses blocks from running until a specified condition is met.
repeat — Repeats a set of blocks a specific number of times.
forever — Repeats a set of blocks indefinitely.
repeat until — Repeats a set of blocks until a condition is met.
while — Repeats a set of blocks while a condition remains true.
if — Runs a set of blocks if a condition is true.
如果 那么/ 否则 — 如果条件为真，则运行一组代码块；否则，运行另一组代码块。
如果 那么 / 否则如果 那么 /否则 — 根据多个条件运行不同的代码块集。
stop project — Ends the project.
等待#
The wait stack block pauses blocks from running for a specific amount of time before moving to the next block.
wait (1) seconds
参数 |
描述 |
|---|---|
时间 |
The amount of time to wait, as a positive whole number or decimal in seconds. |
示例
when started
[Move forward for one second, then stop.]
move [forward v]
wait (1) seconds
stop all movement
等到#
The wait until stack block pauses blocks from running until a specified condition is met before moving to the next block.
wait until <>
参数 |
描述 |
|---|---|
条件 |
此条件必须在程序继续执行下一个指令块之前被满足。 |
示例
when started
[Move forward until screen pressed, then stop.]
move [forward v]
wait until <screen pressed?>
stop all movement
重复#
The repeat C block runs the blocks inside it a set number of times.
repeat [10]
结束
参数 |
描述 |
|---|---|
次数 |
一个用于设置重复指令块运行次数的整数。 |
示例
when started
[Move in a square path.]
repeat [4]
move [forward v] for [50] [mm v] ▶
turn [right v] for [90] degrees ▶
结束
永久循环#
The forever C block keeps running the blocks inside it again and again without stopping.
forever
结束
参数 |
描述 |
|---|---|
该指令块没有参数。 |
示例
when started
[Move in a square path forever.]
forever
move [forward v] for [50] [mm v] ▶
turn [right v] for [90] degrees ▶
结束
重复直到#
The repeat until C block runs the blocks inside it repeatedly while the specified condition is not met.
repeat until <>
结束
参数 |
描述 |
|---|---|
条件 |
An expression or variable that is checked before each loop. If it is False, the blocks continue repeating. If it is True, the loop will stop. |
示例
when started
[Repeat until the screen is pressed before turning off the LEDs.]
repeat until <screen pressed?>
set [lightall v] LED color to [red v]
结束
set [lightall v] LED color to [off v]
当#
The while C block runs the blocks inside repeatedly while the specified condition is met.
while <>
结束
参数 |
描述 |
|---|---|
条件 |
An expression or variable that is checked before each loop. If it is True, the blocks continue repeating. If it is False, the loop will stop. |
示例
when started
[Keep the LEDs green while the robot is moving.]
move [forward v] for [200] [mm v] ◀ and don't wait
while <move active?>
set [lightall v] LED color to [green v]
结束
set [lightall v] LED color to [off v]
如果#
The if C block runs the blocks inside if the condition is True.
if <> then
结束
参数 |
描述 |
|---|---|
条件 |
An expression or variable that is checked when the statement runs. If it is True, the blocks inside the if block will run. If it is False, the blocks are skipped over. |
示例
when started
[Kick when the screen is pressed.]
forever
if <screen pressed?> then
kick object [medium v]
结束
结束
如果/否则#
The if / else C block determines which set of blocks runs based on whether the condition is True or False.
if <> then
else
结束
参数 |
描述 |
|---|---|
条件 |
An expression or variable that is checked when the statement runs. If it is True, the blocks inside the if block will run. If it is False, it will runs the blocks inside the else block. |
示例
when started
[Show one emoji when the screen is touched and a different one when it's not.]
forever
if <screen pressed?> then
show [emoji_excited v] looking [forward v]
else
show [emoji_bored v] looking [forward v]
结束
结束
如果/否则 如果/否则#
The if / else if / else expandable C block selects which set of blocks runs based on conditions:
if runs its block of code if the condition evaluates as True.
else if checks additional conditions only if all previous conditions evaluated as False. Multiple else if statements can be used.
else runs its block of code only if none of the previous conditions evaluated as True.
if <> then
else if <> then
else
结束
参数 |
描述 |
|---|---|
条件 |
An expression or variable that is checked when the statement runs. The first condition that is True runs that set of blocks. If all conditions evaluate as False, the blocks inside the else block will run. |
示例
when Controller axis [1 v] is changed
[Move the robot forward or reverse based on the position of the joystick.]
if <(controller axis [1 v] position) [math_greater_than v] [0]> then
move [forward v]
else if <(controller axis [1 v] position) [math_less_than v] [0]> then
move [reverse v]
else
stop all movement
结束
退出循环#
The break stack block exits a loop immediately. This block can be used inside repeat, repeat until, while, and forever blocks. Break is useful when a loop needs to stop early based on something that happens during the project, like a button being pressed or a sensor detecting an object.
break
参数 |
描述 |
|---|---|
该指令块没有参数。 |
示例
when started
[Flash LEDs until the screen is pressed.]
forever
set [lightall v] LED color to [red v]
wait [0.5] seconds
set [lightall v] LED color to [green v]
wait [0.5] seconds
if <screen pressed?> then
break
结束
结束
停止程序#
The stop project stack block ends a running project.
stop project
参数 |
描述 |
|---|---|
该指令块没有参数。 |
示例
when started
[Stop the project once the screen is pressed.]
forever
set [lightall v] LED color to [red v]
wait [0.5] seconds
set [lightall v] LED color to [green v]
wait [0.5] seconds
if <screen pressed?> then
stop project
结束
结束