How to draw the three triangle in single page using canvas?

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3条回答

死守一世寂寞

2021-01-24 11:25

<!DOCTYPE HTML>
<html>
   <head>
      
      <style>
         #test {
            width: 100px;
            height:100px;
            margin: 0px auto;
         }
      </style>
      
      <script type="text/javascript">
         function drawShape(){
            var canvas = document.getElementById('mycanvas');
            
            if (canvas.getContext){
            
               var ctx = canvas.getContext('2d');
            
               ctx.beginPath();
               ctx.moveTo(25,25);
               ctx.lineTo(105,25);
               ctx.lineTo(25,105);
               ctx.fill();
            
               ctx.beginPath();
               ctx.moveTo(125,125);
               ctx.lineTo(125,45);
               ctx.lineTo(45,125);
               ctx.closePath();
               ctx.stroke();
            }
}
          
      </script>
   </head>
   
   <body id="test" onload="drawShape();">
      <canvas id="mycanvas"></canvas>
   </body>
   
</html>

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时光说笑

2021-01-24 11:29

function draw() {
  var canvas = document.getElementById('canvas');
  if (canvas.getContext){
    var ctx = canvas.getContext('2d');

    ctx.beginPath();
    ctx.moveTo(75,50);
    ctx.lineTo(100,75);
    ctx.lineTo(100,25);
    ctx.fill();
  }
}

<html>
 <body onload="draw();">
   <canvas id="canvas" width="100" height="100"></canvas>
 </body>
</html>

You can reffer following artice-Drawing shapes in canvas.

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旧时难觅i

2021-01-24 11:31

<!DOCTYPE html>
<html>
<head>
<title>Triangle Canvas Example</title>
</head>
<body>
<canvas id="myCanvas" width="500" height="500"></canvas>
<script>
 var canvasElement = document.querySelector("#myCanvas");
var context = canvasElement.getContext("2d");
 
// the triangle
context.beginPath();
context.moveTo(200, 100);
context.lineTo(100, 300);
context.lineTo(300, 300);
context.closePath();
 
// the outline
context.lineWidth = 10;
context.strokeStyle = '#666666';
context.stroke();
 
// the fill color
context.fillStyle = "#FFCC00";
context.fill();
    </script>
</body>
</html>

`Try this

Html :

<!DOCTYPE html>
<html>
<head>
    <title>Triangle Canvas Example</title>
</head>
<body>
    <canvas id="myCanvas" width="500" height="500"></canvas>



</body>
</html>

javascript :

    var canvasElement = document.querySelector("#myCanvas");
var context = canvasElement.getContext("2d");

// the triangle
context.beginPath();
context.moveTo(100, 100);
context.lineTo(100, 300);
context.lineTo(300, 300);
context.closePath();

// the outline
context.lineWidth = 10;
context.strokeStyle = '#666666';
context.stroke();

// the fill color
context.fillStyle = "#FFCC00";
context.fill();

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