// Example 6-6: Legs with a for loop

size(480, 270);
background(255);

int y = 80;       // Vertical location of each line
int spacing = 10; // How far apart is each line
int len = 20;     // Length of each line

// Translation of the legs while loop to a for loop.
// THREE ;-SEPARATED SECTIONS OF THE FOR LOOP ARE:
// 1. VARIABLE INITIALIZATION WHEN YOU START THE LOOP.
// 2. TEST CODE THAT RUNS AT THE TOP OF THE LOOP.
// 3. VARIABLE UPDATE CODE THAT RUNS BEFORE THE 2ND & SUBSEQUENT LOOP TESTS
for (int x = 50, z = 60; x <= 150; x += spacing, z = z + spacing) { 
  line(x, y, z, y + len);
}
/* THE FOLLOWING CODE HAS THE SAME EFFECT AS THE ABOVE FOR LOOP
for (int x = 50 ; x <= 150; x += spacing) { 
  line(x, y, x, y + len);
}

int x = 50 ;  // declare variable x and initialize it.
while (x <= 150) {
  line(x, y, x, y + len);
  x += spacing ; // Update loop control variable
}
*/