未使用裁剪绘制一个圆
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 |
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style> *{margin:0; padding:0;} html, body{width:100%; height:100%; overflow:hidden; background-color:#AFAFAF;} </style> </head> <body> <canvas id="canvas"></canvas> <script> var canvas = document.getElementById('canvas'), context = canvas.getContext('2d'); canvas.width = document.body.clientWidth; canvas.height = document.body.clientHeight; context.lineWidth = 3; context.strokeStyle = 'red'; context.beginPath(); context.arc(200, 200, 100, (Math.PI / 180) * 0, (Math.PI / 180) * 360, false); context.stroke(); context.closePath(); </script> </body> </html> |
效果
使用clip()裁剪区域
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 |
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style> *{margin:0; padding:0;} html, body{width:100%; height:100%; overflow:hidden; background-color:#AFAFAF;} </style> </head> <body> <canvas id="canvas"></canvas> <script> var canvas = document.getElementById('canvas'), context = canvas.getContext('2d'); canvas.width = document.body.clientWidth; canvas.height = document.body.clientHeight; context.lineWidth = 3; context.strokeStyle = 'red'; context.rect(0, 0, 200, 200); context.clip(); context.beginPath(); context.arc(200, 200, 100, (Math.PI / 180) * 0, (Math.PI / 180) * 360, false); context.stroke(); context.closePath(); </script> </body> </html> |
效果
也可以使用arc绘制圆形的剪裁区域
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 |
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style> *{margin:0; padding:0;} html, body{width:100%; height:100%; overflow:hidden; background-color:#AFAFAF;} </style> </head> <body> <canvas id="canvas"></canvas> <script> var canvas = document.getElementById('canvas'), context = canvas.getContext('2d'); canvas.width = document.body.clientWidth; canvas.height = document.body.clientHeight; context.lineWidth = 3; context.strokeStyle = 'red'; context.arc(100, 100, 150, (Math.PI / 180) * 0, (Math.PI / 180) * 360, false); context.clip(); context.beginPath(); context.arc(200, 200, 100, (Math.PI / 180) * 0, (Math.PI / 180) * 360, false); context.stroke(); context.closePath(); </script> </body> </html> |
效果
使用save和restore实现只裁剪单个路径
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 |
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style> *{margin:0; padding:0;} html, body{width:100%; height:100%; overflow:hidden; background-color:#AFAFAF;} </style> </head> <body> <canvas id="canvas"></canvas> <script> var canvas = document.getElementById('canvas'), context = canvas.getContext('2d'); canvas.width = document.body.clientWidth; canvas.height = document.body.clientHeight; context.lineWidth = 3; context.strokeStyle = 'red'; context.save(); context.rect(0, 0, 200, 200); context.clip(); context.beginPath(); context.arc(200, 200, 100, (Math.PI / 180) * 0, (Math.PI / 180) * 360, false); context.stroke(); context.closePath(); context.restore(); context.beginPath(); context.arc(250, 250, 100, (Math.PI / 180) * 0, (Math.PI / 180) * 360, false); context.stroke(); context.closePath(); </script> </body> </html> |
效果
本文转载自励志网
如需转载，请注明文章出处和来源网址：http://www.divcss5.com/html/h57994.shtml
