p5.js |鼠标移动X

p5.js 中的movedX变量包含自草图的最后一帧以来鼠标的水平移动。正值表示鼠标向右移动，负值表示鼠标在最后一帧向左移动。

句法：

movedX

下面的程序说明了 p5.js 中的movedX变量：
示例 1：

javascript

function setup() {
  createCanvas(400, 300);
  textSize(16);
  
  fpsSlider = createSlider(1, 60, 30, 1);
  fpsSlider.position(20, 40);
}
  
function draw() {
  clear();
  text("Move the slider to change the framerate "+
       "of the sketch", 20, 20);
  
  // Set the framerate according to the slider
  frameRate(fpsSlider.value());
  text("Current Framerate: " + fpsSlider.value() + " FPS", 20, 80);
  
  // Use the movedX property
  text("The mouse moved " + movedX + " units in the x-direction", 20, 140);
  text("since the last frame", 20, 160);
}

输出：

示例 2：

javascript

let gameOver = false;
  
function setup() {
  createCanvas(600, 300);
  textSize(16);
}
  
function draw() {
  clear();
  text(
    "Move the mouse horizontally from one end to "+
    "the other end slowly to keep playing",
    20,
    20
  );
  if (!gameOver) {
  
    // Use the movedX property to display the
    // amount of mouse moved
    text("The mouse moved " + movedX + " units in "+
         "the x-direction", 20, 60);
  
    // Get the absolute amount of mouse moved
    // and finish the game is it goes too fast
    if (abs(movedX) > 3) gameOver = true;
  } else text("You moved too fast! Refresh to try again", 20, 80);
}

输出：

参考： https://p5js.org/reference/#/p5/movedX
环境设置： https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/

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