php绘图技术入门简介

//绘图技术基本步骤前提:在php.ini文件中启用gd库
//创建画布默认背景是黑色的
$img=imagecreatetruecolor(400,300);
//绘制各种图形
//创建一个颜色
$background = imagecolorallocate($img, 255, 0, 0);
//画圆
//imageellipse($img,30,30,50,50,$background);
//椭圆
//imageellipse($img,30,30,50,30,$background);
//画直线
//imageline($img,0,0,400,300,$background);
//画矩形
//imagerectangle ($img, 50 , 20 , 100 , 40 , $background);
//填充矩形
//imagefilledrectangle ($img, 50 , 20 , 100 , 40 , $background);
//画弧线
//imagearc($img, 100, 100, 150, 150, 180, 270, $background);
//画扇型 IMG_ARC_CHORD直线连接了起始和结束点 IMG_ARC_PIE
//imagefilledarc($img, 100, 100, 150, 150, 180, 270, $background,IMG_ARC_PIE);
//拷贝图片到画布
/*$scrImg=imagecreatefromgif('http://www.baidu.com/img/shouye_b5486898c692066bd2cbaeda86d74448.gif');
$scrImgInfo=getimagesize('http://www.baidu.com/img/shouye_b5486898c692066bd2cbaeda86d74448.gif');
imagecopy ($img,$scrImg,10,10,0,0,$scrImgInfo[0],$scrImgInfo[1]);
*/
//imagecopy ($img,$scrImg,10,10,0,0,270,129);
//写字
//imagestring ($img , 5 , 20 , 20 , "hello,world", $background );
//写中文
$str="PHP绘画技术";
imagettftext ($img , 30 , 0 , 50 ,50, $background , "MSYHBD.TTF" , $str);
//输出图像到网页(或者另存为)
header("content-type: image/png");
imagepng($img);
//销毁该图片(释放内存)
imagedestroy($img);
?>