# PDF_curveto

(PHP 4, PECL pdflib >= 1.0.0)

PDF_curvetoベジエ曲線を描く

### 説明

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

3 つの制御点を使用して現在の点からベジエ曲線を描画します。 成功した場合に `TRUE` を、失敗した場合に `FALSE` を返します。

``` 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);} ```
``` 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);} ```