Drawing app

2020-11-12 15:04:57 -05:00 · 2020-11-12 15:04:57 -05:00 · 6c7994dc12
commit 6c7994dc12
parent dd8c8a78d5
3 changed files with 152 additions and 0 deletions
--- a/drawing-app/index.html
+++ b/drawing-app/index.html
@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <link rel="stylesheet" href="style.css" />
+    <title>Drawing App</title>
+  </head>
+  <body>
+    <canvas id="canvas" width="800" height="700"></canvas>
+    <div class="toolbox">
+      <button id="decrease">-</button>
+      <span id="size">10</span>
+      <button id="increase">+</button>
+      <input type="color" id="color">
+      <button id="clear">X</button>
+    </div>
+
+    <script src="script.js"></script>
+  </body>
+</html>
--- a/drawing-app/script.js
+++ b/drawing-app/script.js
@ -0,0 +1,85 @@
+const canvas = document.getElementById('canvas');
+const increaseBtn = document.getElementById('increase');
+const decreaseBtn = document.getElementById('decrease');
+const sizeEL = document.getElementById('size');
+const colorEl = document.getElementById('color');
+const clearEl = document.getElementById('clear');
+
+const ctx = canvas.getContext('2d');
+
+let size = 10
+let isPressed = false
+let color = 'black'
+let x
+let y
+
+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
+}
+
+increaseBtn.addEventListener('click', () => {
+    size += 5
+
+    if(size > 50) {
+        size = 50
+    }
+
+    updateSizeOnScreen()
+})
+
+decreaseBtn.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))
--- a/drawing-app/style.css
+++ b/drawing-app/style.css
@ -0,0 +1,46 @@
+@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: 2px solid steelblue;
+}
+
+.toolbox {
+  background-color: steelblue;
+  border: 1px solid slateblue;
+  display: flex;
+  width: 804px;
+  padding: 1rem;
+}
+
+.toolbox > * {
+  background-color: #fff;
+  border: none;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 2rem;
+  height: 50px;
+  width: 50px;
+  margin: 0.25rem;
+  padding: 0.25rem;
+  cursor: pointer;
+}
+
+.toolbox > *:last-child {
+  margin-left: auto;
+}