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PHP图像图形处理入门教程(1/3)

Jun 13, 2016 am 09:48 AM
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PHP图像图形处理入门教程 这款php图片生成教程是一款从生成一个简单的图像到生成复杂的图形的php教程,人简单就复杂有12个生成图像实例。 1 生成一个简单图像。

php教程图像图形处理入门教程
这款php图片生成教程是一款从生成一个简单的图像到生成复杂的图形的php教程,人简单就复杂有12个生成图像实例。

1 生成一个简单图像。
2 设定图像的颜色。
3 在图像上绘制直线。
4 在图像上显示文字。
5 在图像中显示中文字符。
6 打开已存在的图片。
7 获取图片的相关属性。
8 函数getimagesize()的用法。
9 为上传图片添加水印效果。
10 生成已有图片的缩略图。
11 使用函数imagecopyresampled()。
12 生成带有底纹的数字验证码图片的php程序。

*/

//1 生成一个简单图像。

$width = 200;
$height =200;

$img =  imagecreatetruecolor($width,$height) or die("不支持gd图像处理");
imagepng($img);
imagedestroy($img);

//2 设定图像的颜色。

$width = 200;
$height =200;

$img =  imagecreatetruecolor($width,$height) or die("不支持gd图像处理");

$bg_color = imagecolorallocate($img, 255, 0, 0);
imagefill($img, 0, 0, $bg_color);

imagepng($img);
imagedestroy($img);

//3 在图像上绘制直线。

$width = 200;
$height =300;

$img =  imagecreatetruecolor($width,$height) or die("不支持gd图像处理");

$line_color = imagecolorallocate($img, 255, 255, 255);
imageline($img,0,40,200,40,$line_color);
imageline($img,0,260,200,260,$line_color);

imagepng($img);
imagedestroy($img);

//4 在图像上显示文字。

$width = 200;
$height =300;

$img =  imagecreatetruecolor($width,$height) or die("不支持gd图像处理");
$line_color = imagecolorallocate($img, 255, 255, 255);

imageline($img, 0, 40, 200, 40, $line_color);
imageline($img, 0, 260, 200, 260, $line_color);
imagestring($img, 5, 0, 60, "it's time to learn php!", $line_color);

imagepng($img);
imagedestroy($img);

//5 在图像中显示中文字符。

$width = 200;
$height =300;

$img =  imagecreatetruecolor($width,$height) or die("不支持gd图像处理");
$line_color = imagecolorallocate($img, 255, 255, 255);
$font_type ="c://windows//fonts//simli.ttf";    //获取truetype字体,采用隶书字体

//“西游记”3个字16进制字符
$cn_char1 = chr(0xe8).chr(0xa5).chr(0xbf);
$cn_char2 = chr(0xe6).chr(0xb8).chr(0xb8);
$cn_char3 = chr(0xe8).chr(0xae).chr(0xb0);

//“吴承恩著”4个字16进制字符
$cn_str = chr(0xe5).chr(0x90).chr(0xb4).chr(0xe6).chr(0x89).chr(0xbf).chr(0xe6).chr(0x81).chr(0xa9);
$cn_str .= " ".chr(0xe8).chr(0x91).chr(0x97);

imageline($img, 0, 40, 200, 40, $line_color);
imageline($img, 0, 260, 200, 260, $line_color);

//竖排显示“西游记”3字
imagettftext($img, 30, 0, 10, 80, $line_color, $font_type,$cn_char1);
imagettftext($img, 30, 0, 10, 120, $line_color, $font_type,$cn_char2);
imagettftext($img, 30, 0, 10, 160, $line_color, $font_type,$cn_char3);

//横排显示“吴承恩著”4字
imagettftext($img, 15, 0, 90, 254, $line_color, $font_type,$cn_str);

imagepng($img);
imagedestroy($img);

//6 打开已存在的图片。
$img=imagecreatefromjpeg("tower.jpg");

imagejpeg($img);
imagedestroy($img);

//7 获取图片的相关属性。
$img=imagecreatefromjpeg("tower.jpg");

$x = imagesx($img);
$y = imagesy($img);
echo "图片tower.jpg的宽为:$x pixels";
echo "
";
echo "
";
echo "图片tower.jpg的高为:$y pixels";

//8 函数getimagesize()的用法。
$img_info=getimagesize("tower.jpg");

for($i=0; $i {
    echo $img_info[$i];
    echo "
";
}

?>
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