Step 7. Program structure

// Can define global variables and constants up here, outside both functions  

function setup() 		 
{
	// Instructions to be executed once, at start of run 
} 

function draw()
{
	// Instructions to be executed every time step 
}  

Note the chain brackets. These define the start and end of blocks of code.

We will now add some new code at certain locations within the structure.