Completed wesbos#8 - Fun with HTML5 Canvas/index-START.html

gbmyt · gbmyt · commit e09b40d6f2dd · 2022-08-22T17:04:21.000-04:00
diff --git a/08 - Fun with HTML5 Canvas/index-START.html b/08 - Fun with HTML5 Canvas/index-START.html
@@ -7,6 +7,55 @@
 <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 = 50;
+  // ctx.globalCompositeOperation = 'multiply';
+
+
+  let isDrawing = false;
+  let lastX = 0;
+  let lastY = 0;
+  let hue = 0;
+  let direction = true;
+
+  function draw(e) {
+    if (!isDrawing) return;
+    ctx.strokeStyle = `hsl(${hue}, 100%, 50%)`;
+    ctx.beginPath();
+
+    ctx.moveTo(lastX, lastY); // Start From
+    ctx.lineTo(e.offsetX, e.offsetY); // Go To
+    ctx.stroke();
+    [lastX, lastY] = [e.offsetX, e.offsetY];
+
+    hue++;
+    if (hue >= 360) {
+      hue = 0;
+    }
+
+    if (ctx.lineWidth >= 120 || 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>
