p5.js | noCanvas()函数

p5.js 中的noCanvas()函数用于删除由 p5.js 创建的默认画布。这可用于不需要画布的草图。它不接受任何参数。

句法：

noCanvas()

参数：此函数不接受任何参数。

下面的程序说明了 p5.js 中的noCanvas()函数：

例子：

function setup() {
  createCanvas(400, 300);
  
  // Create buttons for creating
  // and removing the canvas
  createBtn = createButton("Create Canvas");
  createBtn.position(30, 20);
  createBtn.mouseClicked(createDrawArea);
  
  removeBtn = createButton("Remove Canvas");
  removeBtn.position(30, 50);
  removeBtn.mouseClicked(removeDrawArea);
}
  
function removeDrawArea() {
    
  // Wrap noCanvas() in a try-catch
  // to prevent error in case there
  // exists no canvas to remove
  try {
    noCanvas();
  } catch (e) {
    print("No canvas found to remove");
    print(e);
  }
}
  
function createDrawArea() {
  
  // Create a canvas with the
  // given dimensions
  createCanvas(400, 300);
}
  
function draw() {
  clear();
  background("green");
  textSize(20);
  
  text("This is the canvas area", 50, 130);
  text("Canvas height: " + height, 50, 150);
  text("Canvas width: " + width, 50, 170);
}

输出：

参考： https://p5js.org/reference/#/p5/noCanvas