I created a full 88-key virtual piano that can be played with a computer keyboard. I used C++ openFrameworks for processing/loading graphics and sound.

Not all computer keyboards have 88 keys, so the virtual piano only requires 48 computer keys to be played. As depicted in the image below, all 48 keys are within the red outline. The first key starts at the very top-left of the outline, and the last key is at the very bottom (space bar).

The user can pick from the piano's 5 different 48-key layouts by using the left and right arrow keys on their computer keyboard. As a result, the 48 computer keys correspond to any of the 48-key piano layouts.

When you first run and open the virtual piano, you will be able to play the default 48-key layout as shown below:

If you would like to move to the right on the virtual piano, you can press the right arrow key on your computer keyboard. As a result, you will now be able to play on the 48-key layout as depicted below:

You may continue shifting across the piano's 5 different 48-key locations with the arrow keys. Additionally, each layout will be highlighted with a distinct color. Similarly, every key that is pressed will light up in the color of the layout's outline.

I tried to create a keyboard with the exact dimensions of a standard piano. I based my dimensions off of the graphic down below:

Image URL: http://datagenetics.com/blog/may32016/index.html

I edited all 88 piano key sounds and converted them to mp3 files. I also renamed all the audio files for easier loading and handling. To load and play the audio, I used openFrameworks' ofSoundPlayer Library.

I used piano sounds that were recorded by a Steinway Piano at University of Iowa's Music School.
http://theremin.music.uiowa.edu/MISpiano.html

Graphics: I used openFrameworks' ofxGui Library to draw my graphics.

Features I'd like to add:

• Label each piano key w/ the corresponding computer key
• Use computer mouse to play piano keys
• A recording/playback feature

I would still like to eventually make a Synthesia-like program that visualizes piano. This would involve MIDI processing and more advanced graphics.