线#

初始化线类#

使用以下构造函数创建线跟踪器：

The line constructor uses one parameter:

范围

描述

port

线路跟踪器连接到的 3 线端口，无论它是 大脑 上的端口，还是 3 线扩展器 上的端口。

必须先创建 Brain 或 3-Wire Expander，然后才能使用线路类构造函数创建对象。

// Create the Brain.
brain Brain;
// Construct a Line Tracker "Line" with the line class.
line Line = line(Brain.ThreeWirePort.A);

This Line object will be used in all subsequent examples throughout this API documentation when referring to line class methods.

类方法#

reflectivity()#

The reflectivity(percentUnits units) command returns the reflectivity measured by the Line Tracker. The reflectivity of the Line Tracker is an estimation based on the raw value of the sensor. A reflectivity of 0% is a raw value of 3000 or greater. A reflectivity of 100% is a raw value of 0.

参数

描述

单位

The only valid unit for reflectivity is percent.

返回： 一个双精度值，表示线跟踪器测量的反射率，范围为 0 - 100%。

// Get Line Tracker reflectivity in range of 0 - 100%.
double value = Line.reflectivity();

// Print the reflectivity of the Line Tracker to the
// Brain's screen.
Brain.Screen.print(value);

changed()#

The changed(callback) command registers a callback function for when the value of the Line Tracker changes.

参数

描述

打回来

当线跟踪器的值发生变化时调用的回调函数。

**返回：**无。

// Define the lineChanged function with a void return type,
// showing it doesn't return a value.
void lineChanged() {
  // The Brain will print that the value of the Line Tracker
  // changed on the brain screen.
  Brain.Screen.print("Line Tracker value changed");
}

int main() {
  // Initializing Robot Configuration. DO NOT REMOVE!
  vexcodeInit();

  // Run lineChanged when the value of the Line Tracker changes.
  Line.changed(lineChanged);
}
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