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Unit 11: Graphics

marks the limits of the fill. TheImageFillToBorder( ) function lets you pass the particular Notes
colour of the limits of the fill:
ImageFill(image, x, y, color);
ImageFillToBorder(image, x, y, border_color, color);

Another thing that you may want to do with your images is to rotate them. This could be
helpful to do if you are trying to create a web style brochure, for example. The function used
to accomplish this is called imagerotate and its syntax is:
Imagerotate(image, angle, background color)

The code in Example shows the black box image that was seen before; however it is rotated
using this function by 45 degrees. The background color option, used to specify the color of the
uncovered area after the image is rotated, has been set to 1 to show the contrast of the black
and white colors. Be sure to play with this function to test the results before you put any of this
image management code into full production.

Image rotation example.

<?php
$im = ImageCreate(200,200);

$white = ImageColorAllocate($im,0xFF,0xFF,0xFF);
$black = ImageColorAllocate($im,0x00,0x00,0x00);

ImageFilledRectangle($im,50,50,150,150,$black);
header(‘Content-Type: image/png’);
$im_rotated = imagerotate($im, 45, 1);
ImagePNG($im_rotated);

?>

Figure 11.6: Black Box Image Rotated 45 Degrees

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