DEV Community: Sabiya Tabassum

Day-22 Drawing App

Sabiya Tabassum — Fri, 18 Jun 2021 13:09:36 +0000

Hi Folks,

Before diving into the project, a little bit of introduction about me:

I am Sabiya Tabassum. I completed my B.Tech under CSE major. I'm currently learning React and recently, I have started 50 Projects 50 Days challenge. If you have any queries/ ideas to collaborate with me, you can connect with me at my social media handles.

Coming to our Drawing App Project, Let's dive into it!!

Glimpse of the output of our project:

From the above image, we can get an idea that there is a canvas to draw. And a toolbox to increase or to decrease the thickness, a color input to change the color of the stroke and a clear button to clear the canvas.

Tech stack we are using: HTML,CSS, JS

📌HTML code:

<body>
   <canvas class="canvas" id="canvas" width="600" 
   height="500"></canvas>
  <div class="toolbox" id="toolbox">
     <button class="decrement">-</button>
     <span id="size" class="size">10</span>
     <button class="increment">+</button>
     <input type="color" class="color" />
     <button class="clear" id="clear">X</button>
  </div>
</body>

Detailed Explanation of HTML code:

From the output, we can get a clear idea that we need a canvas. Add width and height attributes to the canvas.
For the toolbox, we create a called toolbox in which we have buttons for decrement and increment. Also take a span tag for size class which indicates the thickness of the line/stroke.
Add a button containing a clear class to clear the canvas.

📌CSS code:

   @import url("https://fonts.googleapis.com/css2? 
   family=Roboto:wght@400;700&display=swap");
 * {
      box-sizing: border-box;
   }
 body {
      background-color: #f5f5f5;
      font-family: "Roboto", sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      height: 100vh;
      margin: 0;
   }
 canvas {
      border: 4px solid steelblue;
   }
 .toolbox {
     background-color: rgb(62, 138, 201);
     width: 606px;
     height: 60px;
     display: flex;
     border: 2px solid rgb(25, 141, 236);
     padding: 10px 20px;
     }
  .toolbox > * {
     display: inline-flex;
     align-items: center;
     justify-content: center;
     margin: 4px;
     padding: 10px;
     font-size: 1.8rem;
     background-color: #fff;
     border: 0;
     cursor: pointer;
     width: 40px;
     height: 39px;
     margin-top: -2px;
  }
 .toolbox > *:last-child {
     margin-left: auto;
     background-color: red;
     color: white;
   }

Detailed explanation of CSS code:

For Centering of elements: Add properties like,
- display:flex - To lay a collection of items out in one direction or another.
- align-items:center - Centering the items.
- justify-content:center - Aligns the flexible container's items to center.
- height:100vh - The page's overall height
- overflow: hidden - This property makes the page unscrollable.
For styling the canvas:
- Add a border property.
For styling the toolbox:
- Specify the width and height for the toolbox.
- Add background-color and padding, margin properties as ur wish.
The .toolbox > * {} means:
- The children in the parent toolbox class gets effected to the styles that we write into these parentheses column.
The .toolbox > *:last-child{} means:
- The last child only gets effected to the styles that we write into these parentheses.
Atlast, you can add some media queries for responsiveness 😊

📌JS code:

  const canvas = document.querySelector(".canvas");
  const incrementBtn = document.querySelector(".increment");
  const decrementBtn = document.querySelector(".decrement");
  const colorEl = document.querySelector(".color");
  const clearEl = document.querySelector(".clear");
  const sizeEl = document.querySelector(".size");

  let size = 10;
  let isPressed = false;
  colorEl.value = "black";
  let color = colorEl.value;
  let x;
  let y;

  const ctx = canvas.getContext("2d");

  canvas.addEventListener("mousedown", (e) => {
          isPressed = true;
          x = e.offsetX;
          y = e.offsetY;
  });

  canvas.addEventListener("mouseup", (e) => {
         isPressed = false;
         x = undefined;
         y = undefined;
  });

 canvas.addEventListener("mousemove", (e) => {
        if (isPressed) {
           const x2 = e.offsetX;
           const y2 = e.offsetY;

           drawCircle(x2, y2);
           drawLine(x, y, x2, y2);
           x = x2;
           y = y2;
       }
 });

 function drawCircle(x, y) {
          ctx.beginPath();
          ctx.arc(x, y, size, 0, Math.PI * 2);
          ctx.fillStyle = color;
          ctx.fill();
  }

 function drawLine(x1, y1, x2, y2) {
          ctx.beginPath();
          ctx.moveTo(x1, y1);
          ctx.lineTo(x2, y2);
          ctx.strokeStyle = color;
          ctx.lineWidth = size * 2;
          ctx.stroke();
  }

 function updateSizeOnScreen() {
         sizeEl.innerText = size;
  }

 incrementBtn.addEventListener("click", () => {
         size += 5;
         if (size > 50) {
             size = 50;
          }
          updateSizeOnScreen();
 });

  decrementBtn.addEventListener("click", () => {
         size -= 5;
         if (size < 5) {
             size = 5;
          }
         updateSizeOnScreen();
   });

  colorEl.addEventListener("change", (e) => {
         color = e.target.value;
  });

  clearEl.addEventListener("click", () => {
         ctx.clearRect(0, 0, canvas.width, canvas.height);
  });

Detailed explanation of JS code:

Firstly, create the variables on which we are making DOM changes.
On Canvas, we have functions mousemove, mousedown and mouseup
We have functions like, drawCircle, drawLine.
These functions are helpful in giving you an idea on drawing elements.
We have to register some events using addEventListener on Increment, decrement, size, color and clear buttons so that when they perform some events like click/change a certain action to be performed.

Finally, the Live demo of output will be:

Github Link:

nerdfswd / Day-22-Drawing-App

Day-22 Drawing App. Created with CodeSandbox

Day-22-Drawing-App

Created with CodeSandbox

View on GitHub

Connect me at https://twitter.com/nerd_fswd

Hope you liked the project!!

Today's Pinch of Motivation:

    And I won't let you get me down
    I'll keep gettin' up when I hit the ground
    Oh, never give up, no, never give up no, no, oh
    I won't let you get me down
    I'll keep gettin' up when I hit the ground
    Oh, NEVER GIVE UP, no, never give up no, no, oh

Day-21 Drag N Drop

Sabiya Tabassum — Thu, 17 Jun 2021 06:17:22 +0000

Hi Folks,

Before diving into the project, a little bit of introduction about me:

Coming to our Drag N Drop Project, Let's Go!!

Glimpse of the output of our project:

From the above image, we can get an idea that there are some boxes. Out of these boxes, one box have an image. We can drag the image and drop in any of the boxes.

Tech stack we are using: HTML,CSS, JS

📌HTML code:

<body>
   <div class="empty">
      <div class="fill" draggable="true"></div>
   </div>
   <div class="empty"></div>
   <div class="empty"></div>
   <div class="empty"></div>
   <div class="empty"></div>
</body>

Detailed Explanation of HTML code:

According to the output, we need atleast 4-5 boxes. So we create 4-5 tags with an empty class inside it.
For a image in the box, we create another inside the empty tag. And add an attribute draggable="true".
draggable="true": The draggable attribute specifies whether an element is draggable or not.

📌CSS code:

   @import url("https://fonts.googleapis.com/css2? 
   family=Roboto:wght@400;700&display=swap");
   * {
      box-sizing: border-box;
   }
   body {
      font-family: "Roboto", sans-serif;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
      margin: 0;
      height: 100vh;
   }
 .empty {
      height: 150px;
      width: 150px;
      margin: 10px;
      border: solid 3px black;
      background: white;
   }
.fill {
     background-image:
          url("https://source.unsplash.com/random/150x150");
     width: 145px;
     height: 145px;
   }
.hold {
     border: 3px solid red;
   }
.hovered {
     background-color: black;
     border-color: rgb(32, 230, 32);
     border-style: dashed;
   }
 @media (max-width: 480px) {
     body {
          flex-direction: column;
     }
 }

Detailed explanation of CSS code:

For Centering of elements: Add properties like,
- display:flex - To lay a collection of items out in one direction or another.
- align-items:center - Centering the items.
- justify-content:center - Aligns the flexible container's items to center.
- height:100vh - The page's overall height
- overflow: hidden - This property makes the page unscrollable.
For styling the empty class:
- Specify height and width of the box.
- Add background-color and border properties.
For styling the fill class:
- Add background-image and height, width properties for the image.
Add styling to hold class and hovered class which will be created further in JS.
- hold class styling - To create an effect around the image, when the image is dragged from the box.
- hovered class styling - To create an effect when the image is hovering on other boxes.
Atlast, Add some responsive media queries 😊

📌JS code:

  const fill = document.querySelector(".fill");
  const empties = document.querySelectorAll(".empty");

  fill.addEventListener("dragstart", dragStart);
  fill.addEventListener("dragend", dragEnd);

  empties.forEach((empty) => {
      empty.addEventListener("dragover", dragOver);
      empty.addEventListener("dragenter", dragEnter);
      empty.addEventListener("dragleave", dragLeave);
      empty.addEventListener("drop", dragDrop);
  });

  function dragStart() {
      this.className += " hold"; //append the hold class here
      setTimeout(() => (this.className = "invisible"), 0);
  }

  function dragEnd() {
      this.className = "fill";
  }

  function dragOver(e) {
      e.preventDefault();
  }

  function dragEnter(e) {
      e.preventDefault();
      this.className += " hovered"; //append hovered class 
                         here while entering into the box.
  }

  function dragLeave() {
      this.className = "empty";
  }

  function dragDrop() {
      this.className = "empty";
      this.append(fill);
  }

Detailed explanation of JS code:

Firstly, create the variables on which we are making DOM changes.
On Fill box, we have two functions dragStart and dragEnd
On Empty box, we have dragOver, dragEnter, dragLeave, drop functions.
These functions are helpful in giving you an idea on drag and drop operations.
We have to append the respective classes i.e., empty, fill classes while performing drag and drop on respective boxes.

Finally, the Live demo of output will be:

Github Link:

nerdfswd / Day-21-Drag-N-Drop

Day-21 Drag N Drop. Created with CodeSandbox

Day-21-Drag-N-Drop

Created with CodeSandbox

View on GitHub

Connect me at https://twitter.com/nerd_fswd

Hope you liked the project!!

Today's Pinch of Motivation:

    When you're high on emotion
    And you're losing your focus
    And you feel too exhausted to pray
    Don't get lost in the moment
    Or give up when you're closest
    All you need is somebody to say
    It's okay not to be okay
    It's okay not to be okay
    When you're down and you feel ashamed
    IT'S OK NOT TO BE OK!!

DEV Community: Sabiya Tabassum

Day-22 Drawing App

Finally, the Live demo of output will be:

Github Link: nerdfswd / Day-22-Drawing-App Day-22 Drawing App. Created with CodeSandbox Day-22-Drawing-App Created with CodeSandbox View on GitHub

nerdfswd / Day-22-Drawing-App

Day-22 Drawing App. Created with CodeSandbox

Day-22-Drawing-App

Connect me at https://twitter.com/nerd_fswd

Today's Pinch of Motivation:

Day-21 Drag N Drop

Finally, the Live demo of output will be:

Github Link: nerdfswd / Day-21-Drag-N-Drop Day-21 Drag N Drop. Created with CodeSandbox Day-21-Drag-N-Drop Created with CodeSandbox View on GitHub

nerdfswd / Day-21-Drag-N-Drop

Day-21 Drag N Drop. Created with CodeSandbox

Day-21-Drag-N-Drop

Connect me at https://twitter.com/nerd_fswd

Today's Pinch of Motivation:

Github Link:

nerdfswd / Day-22-Drawing-App

Day-22 Drawing App. Created with CodeSandbox

Day-22-Drawing-App

Created with CodeSandbox

View on GitHub

Github Link:

nerdfswd / Day-21-Drag-N-Drop

Day-21 Drag N Drop. Created with CodeSandbox

Day-21-Drag-N-Drop

Created with CodeSandbox

View on GitHub