PDF_curveto

(PHP 4, PECL pdflib >= 1.0.0)

PDF_curveto — Draw Bezier curve

说明

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. 成功时返回 TRUE，或者在失败时返回 FALSE。

User Contributed Notes

rune at zedeler dot dk 10-Mar-2005 04:51


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 01-Oct-2002 07:15


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);

}