Day 8 - HTML5 Canvas drawing

weberjacob · weberjacob · commit 049580a9f06f · 2016-12-28T13:00:12.000-06:00
diff --git a/08 - Fun with HTML5 Canvas/index-START.html b/08 - Fun with HTML5 Canvas/index-START.html
@@ -7,6 +7,60 @@
 <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 = '#000000';
+  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 function if user not moused down
+    console.log(e);
+    ctx.strokeStyle = `hsl(${hue}, 100%, 50%)`;
+    ctx.beginPath();
+    //start line from
+    ctx.moveTo(lastX, lastY);
+    //move line to
+    ctx.lineTo(e.offsetX, e.offsetY);
+    ctx.stroke();
+    lastX = e.offsetX;
+    lastY = 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 = e.offsetX;
+    lastY = e.offsetY;
+  });
+
+  canvas.addEventListener('mousemove', draw);
+  canvas.addEventListener('mouseup', () => isDrawing = false);
+  canvas.addEventListener('mouseout', () => isDrawing = false);
 </script>
 
 <style>
