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<?php
namespace PhpOffice\PhpSpreadsheet\Shared;
use GdImage;
class Drawing
{
/**
* Convert pixels to EMU.
*
* @param int $pValue Value in pixels
*
* @return int Value in EMU
*/
public static function pixelsToEMU($pValue)
{
return round($pValue * 9525);
}
/**
* Convert EMU to pixels.
*
* @param int $pValue Value in EMU
*
* @return int Value in pixels
*/
public static function EMUToPixels($pValue)
{
if ($pValue != 0) {
return round($pValue / 9525);
}
return 0;
}
/**
* Convert pixels to column width. Exact algorithm not known.
* By inspection of a real Excel file using Calibri 11, one finds 1000px ~ 142.85546875
* This gives a conversion factor of 7. Also, we assume that pixels and font size are proportional.
*
* @param int $pValue Value in pixels
* @param \PhpOffice\PhpSpreadsheet\Style\Font $pDefaultFont Default font of the workbook
*
* @return int Value in cell dimension
*/
public static function pixelsToCellDimension($pValue, \PhpOffice\PhpSpreadsheet\Style\Font $pDefaultFont)
{
// Font name and size
$name = $pDefaultFont->getName();
$size = $pDefaultFont->getSize();
if (isset(Font::$defaultColumnWidths[$name][$size])) {
// Exact width can be determined
$colWidth = $pValue * Font::$defaultColumnWidths[$name][$size]['width'] / Font::$defaultColumnWidths[$name][$size]['px'];
} else {
// We don't have data for this particular font and size, use approximation by
// extrapolating from Calibri 11
$colWidth = $pValue * 11 * Font::$defaultColumnWidths['Calibri'][11]['width'] / Font::$defaultColumnWidths['Calibri'][11]['px'] / $size;
}
return $colWidth;
}
/**
* Convert column width from (intrinsic) Excel units to pixels.
*
* @param float $pValue Value in cell dimension
* @param \PhpOffice\PhpSpreadsheet\Style\Font $pDefaultFont Default font of the workbook
*
* @return int Value in pixels
*/
public static function cellDimensionToPixels($pValue, \PhpOffice\PhpSpreadsheet\Style\Font $pDefaultFont)
{
// Font name and size
$name = $pDefaultFont->getName();
$size = $pDefaultFont->getSize();
if (isset(Font::$defaultColumnWidths[$name][$size])) {
// Exact width can be determined
$colWidth = $pValue * Font::$defaultColumnWidths[$name][$size]['px'] / Font::$defaultColumnWidths[$name][$size]['width'];
} else {
// We don't have data for this particular font and size, use approximation by
// extrapolating from Calibri 11
$colWidth = $pValue * $size * Font::$defaultColumnWidths['Calibri'][11]['px'] / Font::$defaultColumnWidths['Calibri'][11]['width'] / 11;
}
// Round pixels to closest integer
$colWidth = (int) round($colWidth);
return $colWidth;
}
/**
* Convert pixels to points.
*
* @param int $pValue Value in pixels
*
* @return float Value in points
*/
public static function pixelsToPoints($pValue)
{
return $pValue * 0.75;
}
/**
* Convert points to pixels.
*
* @param int $pValue Value in points
*
* @return int Value in pixels
*/
public static function pointsToPixels($pValue)
{
if ($pValue != 0) {
return (int) ceil($pValue / 0.75);
}
return 0;
}
/**
* Convert degrees to angle.
*
* @param int $pValue Degrees
*
* @return int Angle
*/
public static function degreesToAngle($pValue)
{
return (int) round($pValue * 60000);
}
/**
* Convert angle to degrees.
*
* @param int $pValue Angle
*
* @return int Degrees
*/
public static function angleToDegrees($pValue)
{
if ($pValue != 0) {
return round($pValue / 60000);
}
return 0;
}
/**
* Create a new image from file. By alexander at alexauto dot nl.
*
* @see http://www.php.net/manual/en/function.imagecreatefromwbmp.php#86214
*
* @param string $p_sFile Path to Windows DIB (BMP) image
*
* @return GdImage|resource
*/
public static function imagecreatefrombmp($p_sFile)
{
// Load the image into a string
$file = fopen($p_sFile, 'rb');
$read = fread($file, 10);
while (!feof($file) && ($read != '')) {
$read .= fread($file, 1024);
}
$temp = unpack('H*', $read);
$hex = $temp[1];
$header = substr($hex, 0, 108);
// Process the header
// Structure: http://www.fastgraph.com/help/bmp_header_format.html
if (substr($header, 0, 4) == '424d') {
// Cut it in parts of 2 bytes
$header_parts = str_split($header, 2);
// Get the width 4 bytes
$width = hexdec($header_parts[19] . $header_parts[18]);
// Get the height 4 bytes
$height = hexdec($header_parts[23] . $header_parts[22]);
// Unset the header params
unset($header_parts);
}
// Define starting X and Y
$x = 0;
$y = 1;
// Create newimage
$image = imagecreatetruecolor($width, $height);
// Grab the body from the image
$body = substr($hex, 108);
// Calculate if padding at the end-line is needed
// Divided by two to keep overview.
// 1 byte = 2 HEX-chars
$body_size = (strlen($body) / 2);
$header_size = ($width * $height);
// Use end-line padding? Only when needed
$usePadding = ($body_size > ($header_size * 3) + 4);
// Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption
// Calculate the next DWORD-position in the body
for ($i = 0; $i < $body_size; $i += 3) {
// Calculate line-ending and padding
if ($x >= $width) {
// If padding needed, ignore image-padding
// Shift i to the ending of the current 32-bit-block
if ($usePadding) {
$i += $width % 4;
}
// Reset horizontal position
$x = 0;
// Raise the height-position (bottom-up)
++$y;
// Reached the image-height? Break the for-loop
if ($y > $height) {
break;
}
}
// Calculation of the RGB-pixel (defined as BGR in image-data)
// Define $i_pos as absolute position in the body
$i_pos = $i * 2;
$r = hexdec($body[$i_pos + 4] . $body[$i_pos + 5]);
$g = hexdec($body[$i_pos + 2] . $body[$i_pos + 3]);
$b = hexdec($body[$i_pos] . $body[$i_pos + 1]);
// Calculate and draw the pixel
$color = imagecolorallocate($image, $r, $g, $b);
imagesetpixel($image, $x, $height - $y, $color);
// Raise the horizontal position
++$x;
}
// Unset the body / free the memory
unset($body);
// Return image-object
return $image;
}
}
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