protected $_points;

abstract public function setPoints();

abstract public function getShape();

public function Draw() {

$this->setPoints();

$image = $this->getShape();

imagepng($image, 'shapeimage.png');

imagedestroy($image);

}

public function setPoints() {

$this->_points = array(50, 70, 100);

;

}

public function getShape() {

$c = $this->_points[2]; // base

$b = $this->_points[1]; // sides

$a = $this->_points[0];

// calculate angle, cosine rule

$alpha = acos((pow($b, 2) + pow($c, 2) - pow($a, 2)) / (2 * $b * $c));

// pythag to calc height and y distance

$height = abs(sin($alpha)) * $b;

$width = abs(cos($alpha)) * $b;

$x = 0; // start point

$y = 100;

$points = array(

$x, $y, // start

$x + $c, $y, // base

$x + $width, $y - $height // apex

);

// draw

$image = imagecreatetruecolor(100, 100);

// sets background to red

$white = ImageColorAllocate($image, 255, 255, 255);

ImageFillToBorder($image, 0, 0, $white, $white);

$blue = imagecolorallocate($image, 0, 0, 255);

imagefilledpolygon($image, $points, 3, $blue);

return $image;

}

public function setPoints() {

$this->_points = array(4, 4, 195, 195);

}

public function getShape() {

$x1 = $this->_points[0];

$y1 = $this->_points[1];

$x2 = $this->_points[2];

$y2 = $this->_points[3];

// Create a 55x30 image

$image = imagecreatetruecolor(200, 200);

$white = imagecolorallocate($image, 255, 255, 255);

// Draw a white rectangle

imagefilledrectangle($image, $x1, $y1, $x2, $y2, $white);

return $image;

}

public function setPoints() {

$this->_points = array(100, 100, 100, 100);

}

public function getShape() {

$cx = $this->_points[0];

$cy = $this->_points[1];

$width = $this->_points[2];

$height = $this->_points[3];

// Create a 55x30 image

$image = imagecreatetruecolor(200, 200);

$white = imagecolorallocate($image, 255, 255, 255);

// choose a color for the ellipse

$ellipseColor = imagecolorallocate($image, 0, 0, 255);

// draw the white ellipse

imagefilledellipse($image, $cx, $cy, $width, $height, $ellipseColor);

return $image;

}

public function setPoints() {

$this->_points = array(

40, 50, // Point 1 (x, y)

20, 240, // Point 2 (x, y)

60, 60, // Point 3 (x, y)

240, 20, // Point 4 (x, y)

50, 40, // Point 5 (x, y)

10, 10 // Point 6 (x, y)

);

}

public function getShape() {

// create image

$image = imagecreatetruecolor(250, 250);

// allocate colors

$bg = imagecolorallocate($image, 0, 0, 0);

$blue = imagecolorallocate($image, 0, 0, 255);

// fill the background

imagefilledrectangle($image, 0, 0, 249, 249, $bg);

// draw a polygon

imagefilledpolygon($image, $this->_points, 6, $blue);

return $image;

}