1、把大图缩略到缩略图指定的范围内,可能有留白（原图细节不丢失）
2、把大图缩略到缩略图指定的范围内，不留白（原图会居中缩放，把超出的部分裁剪掉）
3、把大图缩略到缩略图指定的范围内，不留白（原图会剪切掉不符合比例的右边和下边）
thumb_stand.php
'gif', 2=>'jpeg', 3=>'png');
list($fw, $fh, $tmp) = getimagesize($f);
if(!$temp[$tmp]){
return false;
}
$tmp = $temp[$tmp];
$infunc = "imagecreatefrom$tmp";
$outfunc = "image$tmp";
$fimg = $infunc($f);
// 使缩略后的图片不变形，并且限制在 缩略图宽高范围内
if($fw/$tw > $fh/$th){
$th = $tw*($fh/$fw);
}else{
$tw = $th*($fw/$fh);
}
$timg = imagecreatetruecolor($tw, $th);
imagecopyresampled($timg, $fimg, 0,0, 0,0, $tw,$th, $fw,$fh);
if($outfunc($timg, $t)){
return true;
}else{
return false;
}
}
?>thumb_cut.php
'gif', 2=>'jpeg', 3=>'png');
list($fw, $fh, $tmp) = getimagesize($f);
if(!$temp[$tmp]){
return false;
}
$tmp = $temp[$tmp];
$infunc = "imagecreatefrom$tmp";
$outfunc = "image$tmp";
$fimg = $infunc($f);
// $fw = 10;
// $fh = 4;
// $tw = 4;
// $th = 2;
// 把图片铺满要缩放的区域
if($fw/$tw > $fh/$th){
$zh = $th;
$zw = $zh*($fw/$fh);
$_zw = ($zw-$tw)/2;
}else{
$zw = $tw;
$zh = $zw*($fh/$fw);
$_zh = ($zh-$th)/2;
}
// echo $zw."
";
// echo $zh."
";
// echo $_zw."
";
// echo $_zh."
";
// exit;
$zimg = imagecreatetruecolor($zw, $zh);
// 先把图像放满区域
imagecopyresampled($zimg, $fimg, 0,0, 0,0, $zw,$zh, $fw,$fh);
// 再截取到指定的宽高度
$timg = imagecreatetruecolor($tw, $th);
imagecopyresampled($timg, $zimg, 0,0, 0+$_zw,0+$_zh, $tw,$th, $zw-$_zw*2,$zh-$_zh*2);
//
if($outfunc($timg, $t)){
return true;
}else{
return false;
}
}
?>thumb_strict.php
'gif', 2=>'jpeg', 3=>'png');
list($fw, $fh, $tmp) = getimagesize($f);
if(!$temp[$tmp]){
return false;
}
$tmp = $temp[$tmp];
$infunc = "imagecreatefrom$tmp";
$outfunc = "image$tmp";
$fimg = $infunc($f);
if($fw/$tw > $fh/$th){
$fw = $tw * ($fh/$th);
}else{
$fh = $th * ($fw/$tw);
}
$timg = imagecreatetruecolor($tw, $th);
imagecopyresampled($timg, $fimg, 0,0, 0,0, $tw,$th, $fw,$fh);
if($outfunc($timg, $t)){
return true;
}else{
return false;
}
}
?>[文件] thumb_image.rar
