PDFs with PHP part 2 - Color
( Page 2 of 8 )


We have two different color settings to consider. The $_fill_color variable refers to the “non-stroke” color which is applied to fills and text. The $_draw_color variable is the “stroke” color applied to lines.

The following function will set the fill color:


function setFillColor($cs = 'rgb', $c1, $c2 = 0, $c3 = 0, $c4 = 0) 
{
$cs = strtolower($cs);
 if ($cs = 'rgb') {
  /* Using a three component RGB color. */ 
  $this->_fill_color = sprintf('%.3f %.3f %.3f rg', $c1, $c2, $c3); 
  
} 
elseif ($cs = 'cmyk') { 
        /* Using a four component CMYK color. */ 
        $this->_fill_color = sprintf('%.3f %.3f %.3f %.3f k', $c1, $c2, $c3, $c4); 
    } else { 
        /* Grayscale one component color. */ 
        $this->_fill_color = sprintf('%.3f g', $c1); 
    } 
    /* If document started output to buffer. */ 
    if ($this->_page > 0) { 
        $this->_out($this->_fill_color); 
    } 
} 



Notice that we need to pass varying number of color components depending on the colorspace selected: one for grayscale, or several for full color.

Grayscale colors are represented by a single 3 decimal place number followed by the letter 'g'. 0 is black, 1 is white, with a whole lot of shades of gray in between.

For example:
'0.000 g' = black, eg. setFillColor('gray', 0)
'0.200 g' = 20% gray, eg. setFillColor('gray', 0.2)
'0.800 g' = 80% gray, eg. setFillColor('gray', 0.8)

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