PHP: pdf_lineto

pdf_lineto

(PHP 3>= 3.0.6, PHP 4 )

pdf_lineto -- Dessine une ligne.

Description

void pdf_lineto ( resource pdf_object, double x-coor, double y-coor)

pdf_lineto() dessine une ligne entre le point courant et le point de coordonn�es (x-coor, y-coor).

Voir aussi pdf_moveto(), pdf_curveto() et pdf_stroke().

User Contributed Notes
pdf_lineto

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rod-php at thecomplex dot com 01-Oct-2002 05:18
`function find_length ($x1, $y1, $x2, $y2) { // Find distance between two points (x1,y1) and (x2,y2) // Also useful to find length of a line. return sqrt( pow($x2-$x1,2) + pow($y2-$y1,2) ); }`

rod-php at thecomplex dot com
01-Oct-2002 05:20

function find_angle ($x1, $y1, $x2, $y2) {
// This function takes two
points (x1,y1) and (x2,y2)
// as inputs and finds the slope and angle
of a line
// between those two points.  It returns the angle
// and
slope in an array. I can't figure out how to
// return a NULL value, so
if the two input points
// are in a vertical line, the function
returns
// $angle = 90 and $slope = 0. I know this is wrong.
       
if (($x2-$x1) != 0) {
                $slope = ($y2-$y1)/($x2-$x1);

               // Get rotation angle by finding the arctangent of the
slope
                $angle = rad2deg(atan($slope));
              
 if ($x1 > $x2) {
                        $angle = 180+$angle;
  
             } elseif ($y1 > $y2) {
                        $angle =
360+$angle;
                }
        } else {
                //
Vertical line has no slope, 90deg angle
                $angle =
90;
#               unset ($slope);
                $slope = 0;
 
      }
        return array ($angle, $slope);
}

rod-php at thecomplex dot com
01-Oct-2002 05:32

function pdf_arrow ($pdfobj, $x1, $y1, $x2, $y2, $dashed) {
// This
function will draw, stroke, and fill a line
// from (x1,y1) to (x2,y2)
with an arrowhead defined
// by $headangle (in degrees) and
$arrowlength.
// If $dashed is nonzero, a dashed line is drawn.
//
REQUIRES: find_angle
        $headangle = 20;
        $arrowlength =
20;

        list ($angle, $slope) = find_angle($x1, $y1, $x2,
$y2);

        pdf_moveto($pdfobj, $x2, $y2);

        // Find
the two other points of the arrowhead
        // using $headangle and
$arrowlength.
        $xarrow1 =
$x2+cos(deg2rad(180+$angle+$headangle/2))*$arrowlength;
       
$yarrow1 = $y2+sin(deg2rad(180+$angle+$headangle/2))*$arrowlength;
    
   $xarrow2 = $x2+cos(deg2rad(180+$angle-$headangle/2))*$arrowlength;
 
      $yarrow2 =
$y2+sin(deg2rad(180+$angle-$headangle/2))*$arrowlength;
        // Draw
two legs of the arrowhead, close and fill
        pdf_lineto($pdfobj,
$xarrow1, $yarrow1);
        pdf_lineto($pdfobj, $xarrow2,
$yarrow2);
        pdf_closepath($pdfobj);
       
pdf_fill($pdfobj);

        // Find the point bisecting the short
side
        // of the arrowhead. This is necessary so
        //
the end of the line doesn't poke out the
        // beyond the arrow
point.
        $x2line = ($xarrow1+$xarrow2)/2;
        $y2line =
($yarrow1+$yarrow2)/2;

        // Now draw the "body"
line of the arrow
        if ($dashed != 0) {
               
pdf_setdash($pdfobj,5,5);
        }
        pdf_moveto($pdfobj, $x1,
$y1);
        pdf_lineto($pdfobj, $x2line, $y2line);
       
pdf_stroke($pdfobj);
}

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