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Drawing images
- 1. Drawing images on the Server ****(GD-Graphics Designing) ****Image Manipulations in PHP Page no.501 to 536 Chapter 14 JPEG – Joint Photographic Experts Group PNG- Portable Network Graphics BMP - bitmap image GIF-Graphics Interchange Format TIF – Tag Image File Format
- 2. Creating an Imagephpimg.php <?php $h = 100; $w = 300; $i= imagecreate($w, $h); $bcolor= imagecolorallocate($i, 200, 200, 200); header(‘Content-Type:image/jpeg’); // to set the image type (browser) imagejpeg($i); //output a jpeg image to browser or file imagedestroy($i); ?> • Similar to Imagegif(), imagewbmp(),imagepng() • Displaying images in HTML Page <html> …. ….. <img src=“phpimg.php”> …. </html>
- 3. Drawing Lines imageline(image,x1,y1,x2,y2,color) <?php $h = 100; $w = 300; $i= imagecreate($w, $h); $bcolor= imagecolorallocate($i, 200, 200, 200); $blkcolor=imagecolorallocate($i,0, 0, 0); imageline($i, 40, 20, 90, 80, $blkcolor); header(‘Content-Type:image/jpeg’); // to set the image type (browser) imagejpeg($i); //output a jpeg image to browser or file imagedestroy($i); ?>
- 4. Setting Line Thickness imagesetthickness(image,thickness) • <?php $h = 100; $w = 300; $i= imagecreate($w, $h); imagesetthickness($i, 6); $bcolor= imagecolorallocate($i, 200, 200, 200); $blkcolor=imagecolorallocate($i,0, 0, 0); imageline($i, 40, 20, 90, 80, $blkcolor); header(‘Content-Type:image/jpeg’); // to set the image type (browser) imagejpeg($i); //output a jpeg image to browser or file imagedestroy($i); ?>
- 5. Drawing Rectangle imagerectangle(image,x1,y1,x2,y2,color) • <?php $h = 100; $w = 300; $i= imagecreate($w, $h); $bcolor= imagecolorallocate($i, 200, 200, 200); $blkcolor=imagecolorallocate($i,0, 0, 0); imagerectangle($i, 30, 20, 50, 90, $blkcolor); header(‘Content-Type:image/jpeg’); // to set the image type (browser) imagejpeg($i); //output a jpeg image to browser or file imagedestroy($i); ?>
- 6. Drawing Ellipses imageellipse(image,cx,cy,w,h,color) • <?php $h = 100; $w = 300; $i= imagecreate($w, $h); $bcolor= imagecolorallocate($i, 200, 200, 200); $blkcolor=imagecolorallocate($i,0, 0, 0); imageellipse($i, 100,40,150,50,$blkcolor); header(‘Content-Type:image/jpeg’); // to set the image type (browser) imagejpeg($i); //output a jpeg image to browser or file imagedestroy($i); ?>
- 7. Drawing Arcs imagearc(image,cx,cy,w,h,s,e,color)• <?php $h = 100; $w = 300; $i= imagecreate($w, $h); $bcolor= imagecolorallocate($i, 200, 200, 200); $blkcolor=imagecolorallocate($i,0, 0, 0); // draw the mouth imagearc($i, 100, 100, 150, 150, 25, 155, $blkcolor); header(‘Content-Type:image/jpeg’); // to set the image type (browser) imagejpeg($i); //output a jpeg image to browser or file imagedestroy($i); ?>
- 8. Drawing Polygons imagepolygon(image,points,num-points,color) • <?php $h = 100; $w = 300; $points=array{120,60,130,60,150,80,170,40,150,40,110,20,110,90}; $i= imagecreate($w, $h); $bcolor= imagecolorallocate($i, 200, 200, 200); $blkcolor=imagecolorallocate($i,0, 0, 0); imagepolygon($i, $points, 7, $blkcolor); header(‘Content-Type:image/jpeg’); // to set the image type (browser) imagejpeg($i); //output a jpeg image to browser or file imagedestroy($i); ?>
- 9. Filling in Figures imagefilledarc() imagefilledellipse(), imagefilledpolygon(), imagefilledrectangle() • <?php $h = 100; $w = 300; $i= imagecreate($w, $h); $bcolor= imagecolorallocate($i, 200, 200, 200); $rcolor=imagecolorallocate($i, 255, 0, 0); imagefilledrectangle($i,30,20,50,90,$rcolor) header(‘Content-Type:image/jpeg’); // to set the image type (browser) imagejpeg($i); //output a jpeg image to browser or file imagedestroy($i); ?>
- 10. Drawing Individual Pixels imagesetpixel(image,x,y,color) • <?php $h = 100; $w = 300; $i= imagecreate($w, $h); $bcolor= imagecolorallocate($i, 200, 200, 200); $rcolor=imagecolorallocate($i, 255, 0, 0); for($L=50;$L<270,$L+=3) { imagesetpixel($i, $L, $L/3, $rcolor); } header(‘Content-Type:image/jpeg’); // to set the image type (browser) imagejpeg($i); //output a jpeg image to browser or file imagedestroy($i); ?>
- 11. Adding text to an image/Drawing Text • imagestring takes six arguments imagestring($image, $font, $x, $y, $string, $colour); • The font can be 1, 2, 3, 4, 5, where higher numbers produce bigger characters
- 12. Drawing vertical Text • imagestring takes six arguments imagestringup($image, $font, $x, $y, $string, $colour); • The font can be 1, 2, 3, 4, 5, where higher numbers produce bigger characters Helloworld!
- 13. We can also import images and then edit them / working with image files • imagecreatefromgif – Example usages: $im=imagecreatefromgif("someImage.gif"); $im=imagecreatefromgif("someUrlPointingToAGifFile"); • Similarly, there is – imagecreatefrompng – Imagecreatefromjpeg – Imagecreatefromwbmp – Imagecreatefromxbm – Imagecreatefromxpm
- 14. Drawing on an existing image
- 15. Tiling Images Example #1 imagesettile() example <?php // Load an external image $zend = imagecreatefromgif('./zend.gif'); // Create a 200x200 image $im = imagecreatetruecolor(200, 200); // Set the tile imagesettile($im, $zend); // Make the image repeat imagefilledrectangle($im, 0, 0, 199, 199, IMG_COLOR_TILED); // Output image to the browser header('Content-Type: image/png'); imagepng($im); imagedestroy($im); imagedestroy($zend); ?>
- 16. Copying Images (Flip image) imagecopy — Copy part of an image imagecopy ($dst_im , $src_im , $dst_x , $dst_y , $src_x, $src_y ,$src_w ,$src_h ) Copy a part of src_im on to dst_im starting at the x,y coordinates src_x, src_y with a width of src_w and a height of src_h. The portion defined will be copied onto the x,y coordinates, dst_x and dst_y. Example #1 Cropping the PHP.net logo <?php // Create image instances $src = imagecreatefromgif('php.gif'); $dest = imagecreatetruecolor(80, 40); // Copy imagecopy($dest, $src, 0, 0, 20, 13, 80, 40); // Output and free from memory header('Content-Type: image/gif'); imagegif($dest); imagedestroy($dest); imagedestroy($src); ?>