PDF_curveto

(PHP 4, PECL pdflib >= 1.0.0)

PDF_curveto — Draw Bezier curve

Description

bool PDF_curveto ( resource $p , float $x1 , float $y1 , float $x2 , float $y2 , float $x3 , float $y3 )

Draws a Bezier curve from the current point, using 3 more control points. Returns TRUE on success or FALSE on failure.

User Contributed Notes

rune at zedeler dot dk

11 years ago


Rod's function does not work (the thing produced is not even symmetrical).
Here is one that produces a correct approximation to an ellipse:

function pdf_ellipse ($pdfobj,$x,$y,$width,$height) {
// Function to draw an ellipse inscribed in a rectangle
// described by lower left (x,y) with width and height.
  $fac = (4*sqrt(2)-4)/3;
  $dx = $width*(1-$fac)/2;
  $dy = $height*(1-$fac)/2;
  pdf_moveto($pdfobj, $x,$y+$height/2);
  pdf_curveto($pdfobj, $x,$y+$height-$dy, $x+$dx,$y+$height, $x+$width/2,$y+$height);
  pdf_curveto($pdfobj, $x+$width-$dx,$y+$height, $x+$width,$y+$height-$dy, $x+$width,$y+$height/2);
  pdf_curveto($pdfobj, $x+$width,$y+$dy, $x+$width-$dx,$y, $x+$width/2,$y);
  pdf_curveto($pdfobj, $x+$dx,$y, $x,$y+$dy, $x,$y+$height/2);
}

rod-php at thecomplex dot com

13 years ago


function pdf_ellipse_inscribed ($pdfobj,$x,$y,$width,$height) {
// Function to draw an ellipse inscribed in a rectangle 
// described by lower left (x,y) with width and height.
    pdf_moveto($pdfobj, $x,$y+$height/2);
    pdf_curveto($pdfobj, $x,$y+$height/2,$x,$y+$height,$x+$width/2,$y+$height);
    pdf_curveto($pdfobj, $x+$width/2,$y+$height,$x+$width,$y+$height,$x+$width,$y+$height/2);
    pdf_curveto($pdfobj, $x+$width,$y+$height/2,$x+$width,$y,$x+$width/2,$y);
    pdf_curveto($pdfobj, $x+$width/2,$y,$x,$y,$x,$y+$height/2);
}