javascript - 使用 p5.js 构建计算器

Question

所以我只使用 p5.js 构建一个计算器。问题是我真的不知道如何开始获取用户的输入，以及如何使其出现在显示屏中。任何建议都非常感谢，谢谢!到目前为止，这是我的 JS:

function setup() {
    createCanvas(windowWidth, windowHeight);
}

function draw() {
    background(0);
    strokeWeight(5);
    stroke(255);


    let h = windowHeight;
    let w = windowWidth;
    let w1 = w/2.5;
    let w2 = w/10;
    let h1 = h/7.5;
    let h2 = h/13;

    // WHITE BUTTON 0
    if (mouseIsPressed && (mouseX > 0 && mouseX < w/5 && mouseY > h1*6.6 && mouseY < h)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(0, h1*6.6, w/5, h);

    // WHITE BUTTON =
    if (mouseIsPressed && (mouseX > w2*2 && mouseX < w/2.5 && mouseY > h1*6.6 && mouseY < h)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(w2*2, h1*6.6, w/5, h);

    // WHITE BUTTON 1
    if (mouseIsPressed && (mouseX > 0 && mouseX < w2 && mouseY > h1*5.6 && mouseY < h1*6.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(0, h1*5.6, w2, h1);

    // WHITE BUTTON 2
    if (mouseIsPressed && (mouseX > w2 && mouseX < w2*2 && mouseY > h1*5.6 && mouseY < h1*6.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(w2, h1*5.6, w2, h1);

    // WHITE BUTTON 3
    if (mouseIsPressed && (mouseX > w2*2 && mouseX < w2*3 && mouseY > h1*5.6 && mouseY < h1*6.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(w2*2, h1*5.6, w2, h1);

    // WHITE BUTTON +
    if (mouseIsPressed && (mouseX > w2*3 && mouseX < w2*4 && mouseY > h1*5.6 && mouseY < h1*6.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(w2*3, h1*5.6, w2, h1);

    // WHITE BUTTON 4
    if (mouseIsPressed && (mouseX > 0 && mouseX < w2 && mouseY > h1*4.6 && mouseY < h1*5.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(0, h1*4.6, w2, h1);

    // WHITE BUTTON 5
    if (mouseIsPressed && (mouseX > w2 && mouseX < w2*2 && mouseY > h1*4.6 && mouseY < h1*5.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(w2, h1*4.6, w2, h1);

    // WHITE BUTTON 6
    if (mouseIsPressed && (mouseX > w2*2 && mouseX < w2*3 && mouseY > h1*4.6 && mouseY < h1*5.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(w2*2, h1*4.6, w2, h1);

    // WHITE BUTTON -
    if (mouseIsPressed && (mouseX > w2*3 && mouseX < w2*4 && mouseY > h1*4.6 && mouseY < h1*5.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(w2*3, h1*4.6, w2, h1);

    // WHITE BUTTON 7
    if (mouseIsPressed && (mouseX > 0 && mouseX < w2 && mouseY > h1*3.6 && mouseY < h1*4.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(0, h1*3.6, w2, h1);

    // WHITE BUTTON 8
    if (mouseIsPressed && (mouseX > w2 && mouseX < w2*2 && mouseY > h1*3.6 && mouseY < h1*4.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(w2, h1*3.6, w2, h1);

    // WHITE BUTTON 9
    if (mouseIsPressed && (mouseX > w2*2 && mouseX < w2*3 && mouseY > h1*3.6 && mouseY < h1*4.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(w2*2, h1*3.6, w2, h1);

    // WHITE BUTTON x
    if (mouseIsPressed && (mouseX > w2*3 && mouseX < w2*4 && mouseY > h1*3.6 && mouseY < h1*4.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(w2*3, h1*3.6, w2, h1);

    // WHITE BUTTON AC
    if (mouseIsPressed && (mouseX > 0 && mouseX < w2*3 && mouseY > h1*2.6 && mouseY < h1*3.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(0, h1*2.6, w2*3, h1);

    // WHITE BUTTON //
    if (mouseIsPressed && (mouseX > w2*3 && mouseX < w2*4 && mouseY > h1*2.6 && mouseY < h1*3.6)) {
        fill(255);
      } else {
        fill(0);
      }
    strokeWeight(0);
    rect(w2*3, h1*2.6, w2, h1);



    strokeWeight(5);
    stroke(255);

    line(0, h/6, w, h/6);
    line(w1, h/6 + 1, w1, h);
    line(w/1.5, h/6 + 1, w/1.5, h);
    line(w/1.5, h/1.25, w, h/1.25);
    line(0, h1*2 + h2, w1, h1*2 + h2);
    line(0, h1*3 + h2, w1, h1*3 + h2);
    line(0, h1*4 + h2, w1, h1*4 + h2);
    line(0, h1*5 + h2, w1, h1*5 + h2);
    line(0, h1*6 + h2, w1, h1*6 + h2);
    line(w2, (h1*3) + h2, w2, h1*6 + h2);
    line(w2*2, (h1*3) + h2, w2*2, h);
    line(w2*3, (h1*2) + h2, w2*3, h1*6 + h2);
    strokeWeight(0);

    fill(255);
    textSize(w/30);
    textFont('Helvetica Bold')
    text('CALCULATOR', (windowWidth/2) - (windowWidth/10), h/12);

    textSize(w/20)
    text('=', w2*2.85, h1*7.25);
    textSize(w/30)
    text('0', w2*0.9, h1*7.25);
    text('1', w2*0.35, h1*6.25);
    text('2', w2*1.4, h1*6.25);
    text('3', w2*2.4, h1*6.25);
    text('4', w2*0.35, h1*5.25);
    text('5', w2*1.4, h1*5.25);
    text('6', w2*2.4, h1*5.25);
    text('7', w2*0.35, h1*4.25);
    text('8', w2*1.4, h1*4.25);
    text('9', w2*2.4, h1*4.25);
    text('AC', w2*0.2, h1*3.25);
    text('\xF7', w2*3.4, h1*3.25);
    text('\xD7', w2*3.4, h1*4.25);
    text('-', w2*3.425, h1*5.25);
    text('+', w2*3.4, h1*6.25);
}

function windowResized() {
  resizeCanvas(windowWidth, windowHeight);
}

我尝试过使用函数定义第一个值等。但我真的不知道如何使用它们。我是 JavaScript 新手。

Answer 1

嗯，您需要的很多东西已经为您准备好了，您已经有了点击处理程序，所以当 0 被点击时:

if (mouseIsPressed && (mouseX > 0 && mouseX < w/5 && mouseY > h1*6.6 && mouseY < h)) {
    fill(255);
  } else {
    fill(0);
  }
}

我要做的是为用户输入创建一个数组，用户点击的每个按钮只需将其添加到数组

let userInput = []; // declared above the setup function
....

if (mouseIsPressed && (mouseX > 0 && mouseX < w/5 && mouseY > h1*6.6 && mouseY < h)) {
    userInput.push(0); // add the nubmer to the array
    fill(255);
  } else {
    fill(0);
 }

然后您可以在绘图循环中循环遍历该数组以输出它，例如:

let startX = 0;
for (let input of userInput) {
    text(input, startX, 100);
    startX += 10;
}