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If you've been working with PHP for a while, you already know that the language makes dynamic image generation very simple: the GD extension and a few lines of PHP code are all you need to create a JPEG, GIF or PNG image from scratch. However, while this works remarkably well for simple tasks, it can become tedious and complicated if you need to generate more complex images, such as graphs and charts, at run-time.
Take, for example, the task of turning a set of data values into a pie chart image. To arrive at the required result, you would need to allocate colors for each slice of the pie, calculate arc endpoints corresponding to the slice sizes, draw arcs and lines, fill each slice with a different color, write a descriptive text string and percentage value next to each slice, and render the final image. Completing the task might require between 80-100 lines of code and a few hours of debugging time...definitely not the most fun way to spend a Friday evening!
However, there's a simpler alternative: PHP's GDChart extension, which provides a full-featured API to efficiently generate charts and graphs. This extension, which is freely available from PECL, can significantly reduce the amount of work involved in dynamically generating graphical representations of numerical data at run-time. Over the next few pages, I'll introduce you to this extension, illustrating its important features and showing you just how easy it is to get your Friday evening back.
Scalable Vector Graphics (SVG) is an XML specification for producing vector-based graphic content that you can create, modify, and manipulate dynamically from programming languages. Here, you'll explore the most important techniques and libraries for integrating SVG with PHP to create diverse graphic content—from simple shapes to complex graphs. You'll see how to:
* Convert an SVG document into a PHP document.
* Use the object and embed elements to include an SVG document in an XHTML document.
* Generate SVG using PHP's echo command.
* Generate SVG using the phpHtmlLib library.
* Generate SVG documents using the PEAR::XML_SVG package.
* Generate SVG documents using the PEAR::Image_Canvas package.
* Integrate PHP , SVG, and AJAX.
Today, I'll give a little info on how to achieve the process of creating a thumbnail using PHP, GD and the text from a text file. It is really pretty simple, so lets get started.
Today's example originates from a question asked by a user. How do I thumbnail the image inside given dimensions proportionally and fill the "blank" areas with a color? Well, the answer is here
Usually images are watermarked using a predefined color (let's say for example "white"). How well does this actually work when you're doing the watermark on a light or even a white image? The answer is simple: not very well.
This example illustrates how to use ImagickPixelIterator to get the average luminosity of the background and chosing text color according to it. I tested this algorithm very briefly and the results seemed positive. There's four example images posted at the end of this post to show why background matters when doing a watermark.
Welcome to the second installment of the series that began with "Building a Image Generator Class with PHP 5." In accordance with the series title, these tutorials will guide you through the development of a highly pluggable PHP 5-driven class, which can be useful for embedding dynamically several input strings into a variety of popular graphic formats, including JPG, GIF and PNG.
In this article, you will learn how to build an image generator class with PHP 5, using the functions bundled with the GD library. Such a class has a wide variety of uses, but for the purposes of this three-part series, we will focus on creating a function for displaying noisy images (also known as captchas) on the browser.
Welcome to the fourth part of the series that began with "A Close Look at the GD Library in PHP." This series introduces the most useful functions that come packaged with this powerful graphic PHP library. It also covers the utilization of the library from a practical point of view, since it includes numerous, easy-to-follow code samples.
in this fourth tutorial of the series, I'll show you how to draw some additional shapes, such as filled arcs, and ellipses, along with creating dynamically different types of polygons and retrieving basic information about a given image stream.
If you're a PHP developer looking for an approachable guide on how to use the popular GD extension available with PHP 4 and PHP 5, then look no further, because this series might be what you need. Welcome to the third article of the series that began with "A Close Look at the GD Library in PHP." In this group of tutorials, you'll find distilled material on using the most important functions that come integrated with the GD library.
