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<?php |
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// $Id$ |
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/** |
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* @file |
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* The bezier class. Takes four points and draws a bezier curve. |
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* Based on bezier.class.php by Reza Salehi, zaalion@yahoo.com. |
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*/ |
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class bezier { |
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function bezier($x0, $y0, $x1, $y1, $x2, $y2, $x3, $y3) { |
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$this->dimx=400; |
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$this->dimy=400; |
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$this->br=0; |
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$this->bg=0; |
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$this->bb=0; |
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$this->ar=255; |
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$this->ag=255; |
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$this->ab=255; |
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$this->hasgrid=0; |
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$this->t_start=0; |
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$this->t_end=1; |
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$this->render=0; |
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$this->step=.01; |
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$this->x0=$x0; |
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$this->y0=$y0; |
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$this->x1=$x1; |
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$this->y1=$y1; |
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$this->x2=$x2; |
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$this->y2=$y2; |
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$this->x3=$x3; |
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$this->y3=$y3; |
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$this->cx=3*($x1-$x0); |
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$this->bx=3*($x2-$x1)-$this->cx; |
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$this->ax=$x3-$x0-$this->cx-$this->bx; |
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$this->cy=3*($y1-$y0); |
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$this->by=3*($y2-$y1)-$this->cy; |
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$this->ay=$y3-$y0-$this->cy-$this->by; |
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$this->function_x='('.$this->ax.')*$t*$t*$t+('.$this->bx.')*$t*$t+('.$this->cx.')*$t+'.$this->x0; |
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$this->function_y='('.$this->ay.')*$t*$t*$t+('.$this->by.')*$t*$t+('.$this->cy.')*$t+'.$this->y0; |
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$this->function_z=2; |
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} |
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//---- some validations. |
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function zscale() { |
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return(1); |
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} |
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function yscale() { |
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return(1); |
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} |
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function xscale() { |
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return(1); |
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} |
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function draw() { |
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header("Content-type: image/jpeg"); |
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$image=imagecreate($this->dimx,$this->dimy+20); |
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$col=imagecolorallocate($image,$this->br,$this->bg,$this->bb); |
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$col1=imagecolorallocate($image,$this->ar,$this->ag,$this->ab); |
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$col2=imagecolorallocate($image, 250, 250, 100); |
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$col3=imagecolorallocate($image, 50, 50, 50); |
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$grcol=imagecolorallocate($image,8,100,8); |
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imageline($image, $this->dimx/2, 0, $this->dimx/2, $this->dimy, $col3); |
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imageline($image, 0, $this->dimy/2, $this->dimx, $this->dimy/2, $col3); |
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imageline($image, $this->x0+$this->dimx/2, -$this->y0+$this->dimy/2, $this->x1+$this->dimx/2, -$this->y1+$this->dimy/2, $col2); |
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imageline($image, $this->x2+$this->dimx/2, -$this->y2+$this->dimy/2, $this->x3+$this->dimx/2, -$this->y3+$this->dimy/2, $col2); |
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imagestring ($image, 2, $this->x0+$this->dimx/2, -$this->y0+$this->dimy/2, 'A', $col1); |
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imagestring ($image, 2, $this->x1+$this->dimx/2, -$this->y1+$this->dimy/2, 'B', $col1); |
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imagestring ($image, 2, $this->x2+$this->dimx/2, -$this->y2+$this->dimy/2, 'C', $col1); |
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imagestring ($image, 2, $this->x3+$this->dimx/2, -$this->y3+$this->dimy/2, 'D', $col1); |
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$j = 0; |
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$colx = $col1; |
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for ($t = $this->t_start; $t < $this->t_end; $t += $this->step) { |
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eval('$this->x_points[$j]='.$this->xscale().'*'.$this->function_x.';'); |
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eval('$this->y_points[$j]='.$this->yscale().'*'.$this->function_y.';'); |
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eval('$this->z_points[$j]='.$this->zscale().'*'.$this->function_z.';'); |
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imagearc($image, $this->x_points[$j]+$this->dimx/2, ($this->y_points[$j]*(-1))+$this->dimy/2, $this->z_points[$j], $this->z_points[$j], 0, 360, $colx); |
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$j++; |
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} |
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imagefilledrectangle ($image, 5, $this->dimy-30, $this->dimx/2, $this->dimy+10, $col); |
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imagestring ($image, 2, 10, $this->dimy-40, 'start point (A) = ('.$this->x0.','.$this->y0.')', $col1); |
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imagestring ($image, 2, 10, $this->dimy-28, 'end point (D) = ('.$this->x3.','.$this->y3.')', $col1); |
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imagestring ($image, 2, 10, $this->dimy-15, 'control 1 (B) = ('.$this->x1.','.$this->y1.')', $col1); |
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imagestring ($image, 2, 10, $this->dimy-3 , 'control 2 (C) = ('.$this->x2.','.$this->y2.')', $col1); |
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imagejpeg($image,"",100); |
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} |
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} |
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