Ejemplo dibujando curva PHP
Un ejemplo para dibujar la curva de Lissajous (http://en.wikipedia.org/wiki/Lissajous_curve):
x = A1 * cos (t/T1);
y = a2 * sen (T/T2);
Usted puede modificar fácilmente el código para crear su propia aplicación osciloscopio!
<?php header ("Content-type: image/png");$T1 = 20;$T2 = 30;$myImage = @imagecreatetruecolor(640, 480) or die("Cannot Initialize new GD image stream");$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=0; $i<1000; $i=$i+1) { //define curve's function $x = 310*cos($i/$T1); //define x-value $y = 230*sin($i/$T2);//define y-value //move the coordinate, append a point's x-value and y-value $points[] = 320+$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],$poly_color); }//finalizingimagepng($myImage);imagedestroy($myImage);?>
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