Finish challenge wesbos#7/wesbos#8

LeiG · LeiG · commit d7a6798d0ae0 · 2017-06-28T08:54:20.000-07:00
diff --git a/08 - Fun with HTML5 Canvas/index.html b/08 - Fun with HTML5 Canvas/index.html
@@ -0,0 +1,77 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8">
+    <title>HTML5 Canvas</title>
+  </head>
+  <body>
+    <canvas id="draw" width="800" height="800"></canvas>
+
+    <script>
+     const canvas = document.querySelector('#draw');
+     const ctx = canvas.getContext('2d');
+
+     // spread canvas full window
+     canvas.width = window.innerWidth;
+     canvas.height = window.innerHeight;
+
+     // set defaults
+     ctx.strokeStyle = '#BADA55';
+     ctx.lineJoin = 'round';
+     ctx.lineCap = 'round';
+     ctx.lineWidth = 100;
+
+     let isDrawing = false;
+     let lastX = 0;
+     let lastY = 0;
+     let hue = 0;
+     let direction = true;
+
+     function draw(e) {
+       if (!isDrawing) return; // only draw when mouse is down
+
+       console.log(e);
+
+       ctx.strokeStyle = `hsl(${hue}, 100%, 50%)`;
+
+       ctx.beginPath();
+       ctx.moveTo(lastX, lastY);
+       ctx.lineTo(e.offsetX, e.offsetY);
+       ctx.stroke();
+
+       [lastX, lastY] = [e.offsetX, e.offsetY];
+
+       if (hue >= 360) {
+         hue = 0;
+       } else {
+         hue++;
+       }
+
+       if (ctx.lineWidth >= 100 || ctx.lineWidth <= 1) {
+         direction = !direction;
+       }
+
+       if (direction) {
+         ctx.lineWidth++;
+       } else {
+         ctx.lineWidth--;
+       }
+     }
+
+     canvas.addEventListener('mousedown', (e) => {
+       isDrawing = true;
+       [lastX, lastY] = [e.offsetX, e.offsetY];
+     });
+
+     canvas.addEventListener('mousemove', draw);
+     canvas.addEventListener('mouseup', () => isDrawing = false);
+     canvas.addEventListener('mouseout', () => isDrawing = false);
+    </script>
+
+    <style>
+     html, body {
+       margin:0;
+     }
+    </style>
+  </body>
+</html>
