Join David Powers for an in-depth discussion in this video Build a musical instrument using mouse movements, part of Code Clinic: PHP.
- Hello and welcome to Code Clinic. My name is David Powers. Code Clinic is a monthly course where a unique problem is introduced to a collection of lynda.com authors. In response, each author creates a solution using their programming language of choice, mine is PHP. You can learn several things from Code Clinic, different approaches to solving a problem, the pros and cons of different languages, and some tips and tricks to incorporate into your own coding practices. This month the problem is to create a musical instrument controlled by the mouse.
Move the mouse up and down to change the pitch. Move it side to side to change the volume. The instrument is silent until we click and hold one of the mouse buttons. Letting go of the button turns off the musical tone. It’s a simple request, but because it requires access to the mouse it may be difficult or impossible in some languages. In all cases we’ll explore some ways to solve the problem, and learn why they might not work. Thomas Edison observed, “Negative results are just what I want.
“They’re just as valuable to me as positive results. “I can never find the thing that does the job best “until I find the ones that don’t.” You may want to take some time to try to solve the problem yourself. Is there a viable PHP solution? In the next videos I’ll explain how I answered this challenge.
David introduces challenges and provides an overview of his solutions in PHP. Challenges include topics such as statistical analysis, searching directories for images, and accessing peripheral devices.
Visit other courses in the series to see how to solve the exact same challenges in languages like C#, C++, Java, Python, and Ruby.
Skill Level Intermediate
Q: I'm encountering script errors message with the prime_dates.php file used in the "Priming the date_record column" movie in this course. How can I resolve these errors?
A: To avoid script errors, use bindValue() instead of bindParam() in
Line 9 of the prime_dates.php file. You can also download the latest
copy of the exercise files, which corrects this issue for you. For a
more in-depth explanation of the difference between bindValue() and
bindParam(), check out the "Binding input and output values" video (http://www.lynda.com/PHP-
Q: Why can't I access the Lake Pend Orielle site (http://lpo.dt.navy.mil)?
A: The Lake Pend Orielle site is not accessible in some geographical areas. We have contacted the owner of the server to try to resolve this issue.
Q: I am unable to access the Lake Pend Oreille data from outside the U.S.
A: A static copy of this data is provided here for lynda.com members outside of the U.S
Problem One: Statistical Analysis
Problem Two: Image Analysis
Problem Three: Eight Queens
Problem Four: Accessing Peripherals
Problem Five: Recursion and Directories
Problem Six: Building the Web
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