note 80797 added to function.imageline

An example to draw Amplitude Modulation curve: y = c * sin (x/a) * sin (x/b) . You can easily modify the codes to create your own oscilloscope application! <?php header ("Content-type: image/png"); $myImage = @imagecreatetruecolor(640, 480) or die("Cannot Initialize new GD image stream"); $text_color = imagecolorallocate($myImage, 255, 255, 224); $poly_color = imagecolorallocate($myImage, 124, 120, 224); //calculate x-value and y-value point by point $points = array(); for ($i=1; $i<640; $i=$i+1) { //define curve's function $x = $i; //define x-value, which is $i itself $y = 150*sin($x/80)*sin($x/5);//define y-value //append a point's x-value and y-value $points[] = $x; //x-value $points[] = 240-$y; //y-value } //count points $totalPoints = count($points)/2; //drawing title $title = "Final Plot ($totalPoints points)"; imagestring($myImage, 3, 5, 5, $title, $text_color); /** drawing points one by one, notice if there * are 10 points, we need to draw 9 lines: * 1) point 0 to 1; * 2) point 1 to 2; * ... * ... * 9) point 8 to 9; */ for ($i=0; $i<$totalPoints-1; $i++) { imageLine($myImage, $points[2*$i], $points[1+2*$i], $points[2+2*$i], $points[3+2*$i], $poly_color); } //finalizing imagepng($myImage); imagedestroy($myImage); ?> ---- Server IP: 66.207.199.35 Probable Submitter: 199.71.174.100 ---- Manual Page -- http://www.php.net/manual/en/function.imageline.php Edit -- https://master.php.net/note/edit/80797 Del: integrated -- https://master.php.net/note/delete/80797/integrated Del: useless -- https://master.php.net/note/delete/80797/useless Del: bad code -- https://master.php.net/note/delete/80797/bad+code Del: spam -- https://master.php.net/note/delete/80797/spam Del: non-english -- https://master.php.net/note/delete/80797/non-english Del: in docs -- https://master.php.net/note/delete/80797/in+docs Del: other reasons-- https://master.php.net/note/delete/80797 Reject -- https://master.php.net/note/reject/80797 Search -- https://master.php.net/manage/user-notes.php