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html5——canva 绘图1简单图形
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> body{background: #131115;} #c1{background: #fbf7fe;} </style> <script> window.onload=function(){ var oC=document.getElementById(‘c1‘); var oGC=oC.getContext(‘2d‘); oGC.fillStyle=‘red‘; oGC.strokeStyle="blue"; oGC.lineWidth=10; /*设置角度*/ oGC.lineJoin=‘round‘; /*不带边框的正方形*/ oGC.fillRect(50,50,100,100); /*带边框的正方形*/ oGC.strokeRect(50.5,50.5,100,100); /*背景颜色*/ } </script> </head> <body> <canvas id="c1" width="500" height="500"><!-- 默认宽300; 高150 --> <span>不支持camvas浏览器</span> </canvas> </body> </html>
三角形
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> body{background: #131115;} #c1{background: #fbf7fe;} </style> <script> window.onload=function(){ var oC=document.getElementById(‘c1‘); var oGC=oC.getContext(‘2d‘); /*开始画线*/ oGC.beginPath(); /*起始点*/ oGC.moveTo(100,100); /*点*/ oGC.lineTo(200,200); oGC.lineTo(300,200); /*闭合*/ oGC.closePath(); /*生成线*/ /*oGC.stroke();*/ /*充填*/ oGC.fill(); } </script> </head> <body> <canvas id="c1" width="500" height="500"><!-- 默认宽300; 高150 --> <span>不支持camvas浏览器</span> </canvas> </body> </html>
canvas封装
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> body{background: #131115;} #c1{background: #fbf7fe;} </style> <script> window.onload=function(){ var oC=document.getElementById(‘c1‘); var oGC=oC.getContext(‘2d‘); /*保存路径*/ oGC.save(); oGC.fillStyle=‘red‘; oGC.beginPath(); /*正方形集合函数*/ oGC.rect(100,100,100,100); oGC.closePath(); oGC.fill(); /*恢复路径 oGC.fillStyle=‘red‘;不影响下面代码起到封装作用*/ oGC.restore(); oGC.beginPath(); oGC.rect(220,100,100,100); oGC.closePath(); oGC.fill(); } </script> </head> <body> <canvas id="c1" width="500" height="500"><!-- 默认宽300; 高150 --> <span>不支持camvas浏览器</span> </canvas> </body> </html>
鼠标画线代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> body{background: #131115;} #c1{background: #fbf7fe;} </style> <script> window.onload=function(){ var oC=document.getElementById(‘c1‘); var oGC=oC.getContext(‘2d‘); oC.onmousedown=function(ev){ var ev=ev||window.event; oGC.moveTo(ev.clientX-oC.offsetLeft,ev.clientY-oC.offsetTop); oC.onmousemove=function(ev){ var ev=ev||window.event; oGC.lineTo(ev.clientX-oC.offsetLeft,ev.clientY-oC.offsetTop); oGC.stroke(); } document.onmouseup=function(){ oC.onmousemove=null; oC.onmouseup=null; } } } </script> </head> <body> <canvas id="c1" width="500" height="500"><!-- 默认宽300; 高150 --> <span>不支持camvas浏览器</span> </canvas> </body> </html>
简单的方块下滑代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> body{background: #131115;} #c1{background: #fbf7fe;} </style> <script> window.onload=function(){ var oC=document.getElementById(‘c1‘); var oGC=oC.getContext(‘2d‘); var num=0; oGC.fillStyle=‘red‘; oGC.fillRect(30,0,100,100); setInterval(function(){ num++; oGC.clearRect(30,0, oC.width,oC.height); oGC.fillRect(30,num,100,100); },30) } </script> </head> <body> <canvas id="c1" width="500" height="500"><!-- 默认宽300; 高150 --> <span>不支持camvas浏览器</span> </canvas> </body> </html>
html5——canva 绘图1简单图形
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