HTML5七巧板canvas绘图（复习）

时间：2021-03-11 18:45:46

HTML5七巧板canvas绘图（复习）

HTML5七巧板canvas绘图（复习）

 <!DOCTYPE html>

 <html xmlns="http://www.w3.org/1999/xhtml">

 <head>

     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

     <title></title>

     <script type="text/javascript">

         window.onload = function () {

             var canvas = document.getElementById("canvas");

             var context = canvas.getContext("2d");

             canvas.width = "";

             canvas.height = "";

             var points = [

                 { p: [{ x: , y:  }, { x: , y:  }, { x: , y:  }], color: "red" },

                 { p: [{ x: , y:  }, { x: , y:  }, { x: , y:  }], color: "orange" },

                 { p: [{ x: , y:  }, { x: , y:  }, { x: , y:  }, { x: , y:  }], color: "yellow" },

                 { p: [{ x: , y:  }, { x: , y:  }, { x: , y:  }], color: "green" },

                 { p: [{ x: , y:  }, { x: , y:  }, { x: , y:  }, { x: , y:  }], color: "cyan" },

                 { p: [{ x: , y:  }, { x: , y:  }, { x: , y:  }], color: "blue" },

                 { p: [{ x: , y:  }, { x: , y:  }, { x: , y:  }], color: "purple" }

             ]

             for (var i = ; i < points.length; i++) {

                 context.beginPath();

                 //context.moveTo(points[i].p[0].x, points[i].p[0].y);

                 for (var j = ; j < points[i].p.length; j++) {

                     context.lineTo(points[i].p[j].x, points[i].p[j].y);

                     context.fillStyle = points[i].color;

                 }

                 context.closePath();

                 context.lineWidth = "";

                 context.strokeStyle = "black";

                 context.stroke();

                 context.fill();

             }

         }

     </script>

 </head>

 <body>

     <canvas id="canvas" style="border:5px solid red ;margin:50px,auto;"></canvas>

 </body>

 </html>

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