如何在controlP5中重置文本字段的值？或者我想重置形状

import controlP5.*;

ControlP5 cp5;
Textfield myTextfield;

void setup() {
  size(400, 200);
  cp5 = new ControlP5(this);
  
  // 创建文本字段对象
  myTextfield = cp5.addTextfield("myTextfield")
                    .setPosition(20, 50)
                    .setSize(200, 20)
                    .setFont(createFont("arial", 14))
                    .setFocus(true)
                    .setColor(color(255, 255, 255))
                    .setColorBackground(color(0, 0, 0))
                    .setColorForeground(color(255, 255, 255))
                    .setText("初始值");
}

Button resetButton;

void setup() {
  // ...
  
  // 创建按钮对象
  resetButton = cp5.addButton("resetButton")
                  .setPosition(240, 50)
                  .setSize(60, 20)
                  .setCaptionLabel("重置");
}

void resetButton() {
  // 重置文本字段的值
  myTextfield.setText("");
}

Button resetButton;
float rectX, rectY, rectWidth, rectHeight;

void setup() {
  // ...
  
  // 初始化矩形的参数
  rectX = 100;
  rectY = 100;
  rectWidth = 200;
  rectHeight = 100;
  
  // 创建按钮对象
  resetButton = cp5.addButton("resetButton")
                  .setPosition(240, 50)
                  .setSize(60, 20)
                  .setCaptionLabel("重置");
}

void resetButton() {
  // 重置矩形的位置和大小
  rectX = 100;
  rectY = 100;
  rectWidth = 200;
  rectHeight = 100;
}

void draw() {
  background(255);
  
  // 绘制矩形
  rect(rectX, rectY, rectWidth, rectHeight);
}