complete wesbos#8

Yuri Brunetto · Yuri Brunetto · commit cb3017678b97 · 2016-12-22T14:56:26.000-02:00
diff --git a/08 - Fun with HTML5 Canvas/index-START.html b/08 - Fun with HTML5 Canvas/index-START.html
@@ -6,7 +6,56 @@
 </head>
 <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
+  ctx.globalCompositeOperation = 'ligthen'
+
+  let isDrawing = false
+  let lastX = 0
+  let lastY = 0
+  let hue = 0
+  let direction = true
+
+  function draw(e) {
+    if (!isDrawing) return
+    console.log(e)
+    ctx.strokeStyle = `hsl(${hue}, 30%, 50%)`
+
+    ctx.beginPath()
+    ctx.moveTo(lastX, lastY)
+    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>
