Learning Processing

Chapter 3

Interaction

“Always remember that this whole thing was started with a dream and a mouse.”

—Walt Disney

“The quality of the imagination is to flow and not to freeze.”

—Ralph Waldo Emerson

In this chapter:

– The “flow” of a program.

– The meaning behind setup( )anddraw( ).

– Mouse interaction.

– Your first “dynamic”Processing program.

– Handling events, such as mouse clicks and key presses.

3.1 Go with the flow.

If you have ever played a computer game, interacted with a digital art installation, or watched a screensaver at three in the morning, you have probably given very little thought to the fact that the software that runs these experiences happens over a period of time. The game starts, you save princess so-and-so from the evil ...