示例一：矩形
<!DOCTYPE html><head> <meta charset=utf-8> <title>HTML5畫線、圓、矩形</title> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script> </head> <script> $(document).ready(function(){ var c=document.getElementById("drawbox"); var draw=c.getContext("2d"); //獲取2d內容的引用，調用繪圖API draw.fillStyle="#ff0000"; //方式一指定填充顏色 draw.fillRect(0,0,300,100); //坐標和長寬 draw.fillStyle="rgba(0,0,255,0.5)"; //方式二rgb+透明度 draw.fillRect(400,0,100,100); //坐標和長寬 }) </script> </body> <canvas id="drawbox" width="500" height="500"></canvas> </body> </html>
示例二：線
<!DOCTYPE html><head> <meta charset=utf-8> <title>HTML5畫線、圓、矩形</title> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script> </head> <script> $(document).ready(function(){ var c=document.getElementById("drawbox"); var draw=c.getContext("2d"); //獲取2d內容的引用，調用繪圖API
draw.strokeStyle="#000000"; //指定繪圖線顏色 draw.moveTo(10,10); //起始位置 draw.lineTo(150,10); //終止位置 draw.lineTo(10,50); //結束前繼續之前的結束點連接 draw.lineTo(10,50);
draw.lineTo(10,10); draw.stroke(); //結束 }) </script> </body> <canvas id="drawbox" width="500" height="500"></canvas> </body> </html>
示例三：圓
<!DOCTYPE html><head> <meta charset=utf-8> <title>HTML5畫線、圓、矩形</title> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script> </head> <script> $(document).ready(function(){ var c=document.getElementById("drawbox"); var draw=c.getContext("2d"); //獲取2d內容的引用，調用繪圖API draw.fillStyle="red"; //顏色 draw.beginPath(); //從新畫 draw.arc(50,50,50,0,Math.PI*2,true); //圓心x坐標|圓心y坐標|直徑|始|PI為圓周率，Math.PI*2為畫圓|true為時針方向：逆時針，0為順時針， draw.closePath(); //結束 draw.fill(); }) </script> </body> <canvas id="drawbox" width="500" height="500"></canvas> </body> </html>
示例四：漸變
<!DOCTYPE html><head> <meta charset=utf-8> <title>HTML5畫線、圓、矩形</title> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script> </head> <script> $(document).ready(function(){ var c=document.getElementById("drawbox"); var draw=c.getContext("2d"); //獲取2d內容的引用，調用繪圖API //指定漸變區塊 var grd=draw.createLinearGradient(50,50,200,50); //坐標，長寬 grd.addColorStop(0,"black"); //起點顏色 grd.addColorStop(1,"green"); //終點顏色 draw.fillStyle=grd; //設為填充樣式 draw.fillRect(50,50,200,50); //填充進矩形內 }) </script> </body> <canvas id="drawbox" width="500" height="500"></canvas> </body> </html>
同理所得~~自己嘗試下吧
