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這期內容當中小編將會給大家帶來有關如何正確的使用canvas裁剪函數clip(),文章內容豐富且以專業的角度為大家分析和敘述,閱讀完這篇文章希望大家可以有所收獲。
未使用裁剪繪制一個圓
<!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()裁剪區域
<!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繪制圓形的剪裁區域
<!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實現只裁剪單個路徑
<!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
上述就是小編為大家分享的如何正確的使用canvas裁剪函數clip()了,如果剛好有類似的疑惑,不妨參照上述分析進行理解。如果想知道更多相關知識,歡迎關注億速云行業資訊頻道。
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