adding script wesbos#8

Watson6982 · Watson6982 · commit efacfa72b87e · 2018-09-08T16:37:52.000+01:00
diff --git a/08 - Fun with HTML5 Canvas/index-START.html b/08 - Fun with HTML5 Canvas/index-START.html
@@ -7,6 +7,59 @@
 <body>
 <canvas id="draw" width="800" height="800"></canvas>
 <script>
+  const canvas = document.querySelector('#draw');
+  const ctx = canvas.getContext('2d');
+  canvas.width = window.innerWidth;
+  canvas.height = window.innerHeight;
+  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; // stops the fn from running when not mousedown
+    console.log(e);
+    ctx.strokeStyle = `hsl(${hue}, 100%, 50%)`;
+    ctx.beginPath();
+    // start from
+    ctx.moveTo(lastX, lastY);
+    // go to
+    ctx.lineTo(e.offsetX, e.offsetY);
+    ctx.stroke();
+    // ES6 destructuring an array
+    [lastX, lastY] = [e.offsetX, e.offsetY];
+    
+    hue++;
+    if (hue >= 360) {
+      hue = 0;
+    }
+
+    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>
