所以我有图像：
我想在图像下添加文字(制作消极图像).所以我将它扩展到高度并在底部增加额外的高度.我需要的是写下文字：
Top text
bottom longer text
我也需要这些词语以图像为中心.所以输出应该是：
一切都在PHP GD库上.问题是 – 我不知道如何计算字体大小的比例并使其居中.
我的功能不起作用,计算错误的字体大小和对齐文本错误..
private function __generate_text_pref($type)
{
$data = array();
switch ($type) {
case 'title':
$data['percent'] = 0.9;
$data['text_width_percent'] = 0.8;
break;
case 'subtitle':
$data['percent'] = 0.92;
$data['text_width_percent'] = 0.6;
break;
default:
$data['percent'] = 0.86;
$data['text_width_percent'] = 0.8;
break;
}
list($img_width,$img_height) = getimagesize($this->settings['__temp_image']);
// find font-size for $txt_width = 80% of $img_width...
$data['font_size'] = 1;
$txt_max_width = intval($data['text_width_percent'] * $img_width);
do {
$data['font_size'] ++;
$p = imagettfbBox($data['font_size'],$this->settings['font'],$this->settings['__title']);
$txt_width = $p[2] - $p[0];
// $txt_height=$p[1]-$p[7]; // just in case you need it
} while ( $txt_width <= $txt_max_width );
//$data['font_size'] = ($data['font_size'] > 24) ? 24 : $data['font_size'];
return array(
'font_size' => $data['font_size'],'asys' => array(
'x' => (($img_width - $txt_width) / 2),'y' => ($img_height * $data['percent'])
)
);
}
由于似乎很难确定文本是否比其边界框更宽而不能实际“看到”它,这是我提出的解决方案.
原文链接：https://www.f2er.com/php/136690.html我使用了1000px宽的图像并将其调整为600.当然,你显然已经完成了所有这些工作.
我写的答案并不是那么好(虽然代码已经过测试并且确实有效)所以我希望这会有所帮助.
<?PHP $FormAction = $_SERVER['PHP_SELF']; if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "form1")) { // if form is submitted // get original image $fileName = $_FILES["ImageName"]["name"]; // The file name $fileTempLoc = $_FILES["ImageName"]["tmp_name"]; // File in the PHP tmp folder $type = strtolower(substr(strrchr($fileName,"."),1)); if($type == 'jpeg') { $type = 'jpg'; } // Temporary upload image name $original_image = $_FILES['ImageName']['tmp_name']; // Name to save the image as - in this case the same as the original $new_image = $_FILES['ImageName']['name']; // Get the image dimensions $uploaded_size = getimagesize($original_image); $uploaded_imgw = $uploaded_size[0]; $uploaded_imgh = $uploaded_size[1]; // Maximum image width and height $max_width = "600"; $max_height = "600"; // Thumbnail image width and height $thumbnail_max_width = "100"; $thumbnail_max_height = "100"; // Check to see if we need to resize the image if ($uploaded_imgw > 600 || $uploaded_imgh > 600) { // if image is larger than 600x600 // Resize image using GD2 cmd // Get new dimensions list($width_orig,$height_orig) = getimagesize($original_image); $ratio_orig = $width_orig/$height_orig; // resize our image proportionately maintaining its original aspect if ($thumbnail_max_width/$thumbnail_max_height > $ratio_orig) { $width = $max_width*$ratio_orig; //576 $height = $max_height; } else { $height = $max_height/$ratio_orig; // 576 $width = $max_width; //600 } // Resample / Resize the image $orig_image_p = imagecreatetruecolor($width,$height); if($type == "gif" || $type == "png"){ imagecolortransparent($orig_image_p,imagecolorallocate($orig_image_p,0)); } if($type == "jpg") { $temp_image = imagecreatefromjpeg($original_image); } if($type == "gif") { $temp_image = imagecreatefromgif($original_image); } if($type == "png") { $temp_image = imagecreatefrompng($original_image); } imagecopyresampled($orig_image_p,$temp_image,$width,$height,$width_orig,$height_orig); if($type == "jpg") { imagejpeg($orig_image_p,$original_image,80); } if($type == "gif") { imagegif($orig_image_p,$original_image); } if($type == "png") { imagepng($orig_image_p,9); } move_uploaded_file($original_image,'../../Images/'.$new_image); imagedestroy($temp_image); imagedestroy($orig_image_p); } else { // if image is smaller than 900x900 $small_image_p = imagecreatetruecolor($uploaded_imgw,$uploaded_imgh); if($type == "gif" || $type == "png"){ imagecolortransparent($small_image_p,imagecolorallocate($small_image_p,0)); } if($type == "jpg") { $small_temp_image = imagecreatefromjpeg($original_image); } if($type == "gif") { $small_temp_image = imagecreatefromgif($original_image); } if($type == "png") { $small_temp_image = imagecreatefrompng($original_image); } imagecopyresampled($small_image_p,$small_temp_image,$uploaded_imgw,$uploaded_imgh,$uploaded_imgh); if($type == "jpg") { imagejpeg($small_image_p,80); } if($type == "gif") { imagegif($small_image_p,$original_image); } if($type == "png") { imagepng($small_image_p,'../../Images/'.$new_image); imagedestroy($small_temp_image); imagedestroy($small_image_p); } // end if smaller than 600x600 // Get the image we will work with $new_img_src = '../../Images/'.$new_image; list($new_width,$new_height) = getimagesize($new_img_src); if($type == 'jpg') { $im = imagecreatefromjpeg($new_img_src); } if($type == 'png') { $im = imagecreatefrompng($new_img_src); } if($type == 'gif') { $im = imagecreatefromgif($new_img_src); } // Create a blank canvas for our new image $new_image_p = imagecreatetruecolor($new_width,$new_height); if($type == "gif" || $type == "png"){ imagecolortransparent($new_image_p,imagecolorallocate($new_image_p,0)); } if($type == 'jpg') { $new_temp_image = imagecreatefromjpeg($new_img_src); } if($type == 'png') { $new_temp_image = imagecreatefrompng($new_img_src); } if($type == 'gif') { $new_temp_image = imagecreatefromgif($new_img_src); } imagecopyresampled($new_image_p,$new_temp_image,$new_width,$new_height,$new_height); // set dimensions for our canvas $adj_width = $new_width+40; $adj_height = $new_height+120; $bkgrd = imagecreatetruecolor($adj_width,$adj_height); imagefilledrectangle($bkgrd,$adj_width,$adj_height,0x000000); $sx = imagesx($bkgrd)-imagesx($bkgrd)+20; $sy = imagesy($bkgrd)-imagesy($bkgrd)+20; // Place our original image on the canvas centered and 20px from the top imagecopymerge($bkgrd,$new_image_p,$sx,$sy,imagesx($bkgrd),imagesy($bkgrd),100); // Save the image to file and free memory if($type == "jpg") { imagejpeg($bkgrd,$new_img_src,80); } if($type == "gif") { imagegif($bkgrd,$new_img_src); } if($type == "png") { imagepng($bkgrd,9); } imagedestroy($im); imagedestroy($new_image_p); imagedestroy($bkgrd); //Now we create our text as images to be merged with our new image // check width of bounding Box function calculateTextBox($text,$fontFile,$fontSize,$fontAngle) { /************ simple function that calculates the *exact* bounding Box (single pixel precision). The function returns an associative array with these keys: left,top: coordinates you will pass to imagettftext width,height: dimension of the image you have to create *************/ $rect = imagettfbBox($fontSize,$fontAngle,$text); $minX = min(array($rect[0],$rect[2],$rect[4],$rect[6])); $maxX = max(array($rect[0],$rect[6])); $minY = min(array($rect[1],$rect[3],$rect[5],$rect[7])); $maxY = max(array($rect[1],$rect[7])); return array( "left" => abs($minX) - 1,"top" => abs($minY) - 1,"width" => $maxX - $minX,"height" => $maxY - $minY,"Box" => $rect ); } $text_string = $_POST['TopLine']; //"This is a very long first line to see what happens if it is too long"; $font_ttf = "arial.ttf"; $font_size = 22; $text_angle = 0; $text_padding = 10; // Img padding - around text $the_Box = calculateTextBox($text_string,$font_ttf,$font_size,$text_angle); $imgWidth = $the_Box["width"] + $text_padding; $imgHeight = $the_Box["height"] + $text_padding; $image = imagecreatetruecolor($imgWidth,$imgHeight); imagefill($image,imagecolorallocate($image,0)); $color = imagecolorallocate($image,255,255); imagettftext($image,$text_angle,$the_Box["left"] + ($imgWidth / 2) - ($the_Box["width"] / 2),$the_Box["top"] + ($imgHeight / 2) - ($the_Box["height"] / 2),$color,$text_string); // save file imagepng($image,'../../Images/NewTopImg.png',9); // destroy the image and start over imagedestroy($image); $text_string = $_POST['BottomLine']; //"This is a very long second line to see what happens if it is too long. Even a longer line than the first one."; $font_ttf = "arial.ttf"; $font_size = 16; $text_angle = 0; $text_padding = 10; // Img padding - around text $the_Box = calculateTextBox($text_string,'../../Images/NewBottomImg.png',9); imagedestroy($image); // Now merge the three images together //function merge($filename_x,$filename_y,$filename_result) { // Get dimensions for specified images $filename_vs = '../../Images/'.$new_image; $filename_x = '../../Images/NewTopImg.png'; $filename_y = '../../Images/NewBottomImg.png'; list($width_x,$height_x) = getimagesize($filename_x); list($width_y,$height_y) = getimagesize($filename_y); list($width_vs,$height_vs) = getimagesize($filename_vs); // before we go any farther lets find out if our text is wider than our image if($width_x > $new_width) { // if it is too wide lets resize it // create smaller image using GD2 cmd to the smallest side $line1_img_src = '../../Images/NewTopImg.png'; $line1_img_path = '../../Images/NewTopImg.png'; list($src_width,$src_height) = getimagesize($line1_img_src); $min = $new_width; // set our max width to that of the original image $ratio = $src_height/$src_width; $line1_width = $min; $Line1_height = round($min * $ratio); $blank_image_line1 = imagecreatetruecolor($line1_width,$Line1_height); imagecolortransparent($blank_image_line1,imagecolorallocate($blank_image_line1,0)); $image = imagecreatefrompng($line1_img_src); imagecopyresampled($blank_image_line1,$image,$line1_width,$Line1_height,$src_width,$src_height); imagepng($blank_image_line1,$line1_img_path,9); imagedestroy($blank_image_line1); imagedestroy($image); // Because we resized the first line we need to get the new dimensions $filename_x = '../../Images/NewTopImg.png'; list($width_x,$height_x) = getimagesize($filename_x); // End resize first line } // Now lets check line two if($width_y > $new_width) { // if it is too wide lets resize it // create smaller image using GD2 cmd to the smallest side $line2_img_src = '../../Images/NewBottomImg.png'; $line2_img_path = '../../Images/NewBottomImg.png'; list($src_width,$src_height) = getimagesize($line2_img_src); $min = $new_width; // set our max width to that of the original image $ratio = $src_height/$src_width; $line2_width = $min; $line2_height = round($min * $ratio); $blank_image_line2 = imagecreatetruecolor($line2_width,$line2_height); imagecolortransparent($blank_image_line2,imagecolorallocate($blank_image_line2,0)); $image = imagecreatefrompng($line2_img_src); imagecopyresampled($blank_image_line2,$line2_width,$line2_height,$src_height); imagepng($blank_image_line2,$line2_img_path,9); imagedestroy($blank_image_line2); imagedestroy($image); // Because we resized the second line we need to get the new dimensions $filename_y = '../../Images/NewBottomImg.png'; list($width_y,$height_y) = getimagesize($filename_y); // End resize second line } // Create new image with desired dimensions $image = imagecreatetruecolor($width_vs,$height_vs); // Load images and then copy to destination image if($type == "gif" || $type == "png"){ imagecolortransparent($image,0)); } if($type == 'jpg') { $image_vs = imagecreatefromjpeg($filename_vs); } if($type == 'png') { $image_vs = imagecreatefrompng($filename_vs); } if($type == 'gif') { $image_vs = imagecreatefromgif($filename_vs); } $image_x = imagecreatefrompng($filename_x); $image_y = imagecreatefrompng($filename_y); //set location for merged images $vs_x = imagesx($image); // width of our completed image $vs_y = imagesy($image);// height of our completed image $x_x = $width_x; // width of the top line $x_x = ($vs_x/2)-($x_x/2); $x_y = $new_height+30; // height of the original img + 20px we dropped it from the top of the canvas + 10px more for spacing below our "picture" placed on the canvas $y_x = $width_y; // width of the bottom line $y_x = ($vs_x/2)-($y_x/2); $y_y = $new_height+70; // height of the original img + 20px we dropped it from the top of the canvas + 40px more for spacing below the first line of text imagecopy($image,$image_vs,$width_vs,$height_vs); imagecopy($image,$image_x,$x_x,$x_y,$image_y,$y_x,$y_y,$height_vs); // set dimensions for our canvas $adj_width = $new_width+40; $adj_height = $new_height+120; $bkgrd = imagecreatetruecolor($adj_width,100); // Save the image to file and free memory if($type == "jpg") { imagejpeg($image,$filename_vs,80); } if($type == "gif") { imagegif($image,$filename_vs); } if($type == "png") { imagepng($image,9); } // Clean up imagedestroy($image); imagedestroy($image_x); imagedestroy($image_y); imagedestroy($image_vs); //merge($filename_x,$filename_vs); } // end if form submitted ?> <table width="800" border="0" cellspacing="0" cellpadding="5" align="center"> <tr> <td><div id="FormContainer"> <table width="100%" border="0" cellpadding="0" cellspacing="0"> <tr> <td><div id="Heading">IMAGE UPLOAD</div></td> </tr> </table> <form enctype="multipart/form-data" id="form1" name="form1" method="post" action="<?PHP echo $FormAction; ?>"> <table border="0" align="center" cellpadding="5" cellspacing="0"> <tr> <td colspan="2">Only JPG,JPEG,PNG and GIF files are allowed.</td> </tr> <tr> <td> </td> <td> </td> </tr> <tr> <td><div align="right" class="Strong">File:</div></td> <td><input name="ImageName" type="file" id="ImageName" size="50" /></td> </tr> <tr> <td> </td> <td> </td> </tr> <tr> <td nowrap="nowrap" class="ElementTitle"><div align="right">Line 1 Text:</div></td> <td><input name="TopLine" type="text" id="TopLine" value="This is a very long first line to see what happens if it is too long" size="75" maxlength="100" /></td> </tr> <tr> <td nowrap="nowrap" class="ElementTitle"><div align="right">Line 2 Text:</div></td> <td><input name="BottomLine" type="text" id="BottomLine" value="This is a very long second line to see what happens if it is too long. Even a longer line than the first one." size="75" maxlength="100" /></td> </tr> <tr> <td> </td> <td> </td> </tr> <tr> <td colspan="2"><table width="150" border="0" align="center" cellpadding="5" cellspacing="0"> <tr> <td><div align="center" style="width:80px; height:37px;"> <input name="Submit" type="submit" class="Submit" value="Upload" /> </div></td> <td><div align="center" style="width:75px; height:37px;"> <input name="Submit22" type="reset" class="Submit" value="Reset" /> </div></td> </tr> </table></td> </tr> <tr> <td> </td> <td> </td> </tr> </table><input type="hidden" name="MM_insert" id="MM_insert" value="form1"> </form> </div><!-- end form container --> </td> </tr> <tr> <td> </td> </tr> </table>
基本上你在做什么
>为第一行和第二行创建两个图像
>检查这些图像是否比现有图像宽
如果是这样
>调整它们的大小以适合原始图像宽度
>最后将所有三个图像合并为一个.
您的默认文本大小可以在这里更改… $font_size = 22和$font_size = 16分别为第一行和第二行.
对于我在这里修改和使用的calculateTextBox函数,jodebrabec的部分功劳. You can find it here
短文本的示例输出
使用长文本的示例输出
