Canvas/02_canvas_绘制多个路径_相互独立.html

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title>Page Title</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
</head>

<body>
  <canvas id="myCanvas" style="border:1px solid red;">
    当前浏览器不支持canvas，请更换浏览器后再试
  </canvas>
  <script>
    var canvas = document.getElementById('myCanvas')
    var context = canvas.getContext('2d')
    canvas.width = 1024
    canvas.height = 768

    // * 调用beginPath告诉stroke要画一个新路径
    context.beginPath()
    context.moveTo(100, 100)
    context.lineTo(700, 700)
    context.lineTo(100, 700)
    context.lineTo(100, 500)

    // context.closePath() // * closePath其实和beginPath没有关联关系，closePath的作用是关闭路径(让路径首尾相连形成闭环)，而不是开始一个新的路径

    context.lineWidth = 5
    context.strokeStyle = "red"
    context.fillStyle = "#0f0"


    // * 绘制第一个形状
    context.stroke() // 绘制形状

    context.beginPath()
    context.moveTo(200, 100)
    context.lineTo(700, 600)

    context.strokeStyle = "blue"

    // * 绘制第二个形状
    context.stroke()
  </script>
</body>

</html>