Learning Processing: A Beginner's Guide to Programming Images ...

58 Learning Processing
}
zoogX = width/2; // Zoog always starts in the middle
zoogY = height + 100; // Zoog starts below the screen
smooth();
void draw() {
}
background(255);
// Set ellipses and rects to CENTER mode
ellipseMode(CENTER);
rectMode(CENTER);
// Draw Zoog's body
stroke(0);
fill(150);
rect(zoogX,zoogY,20,100);
// Draw Zoog's head
stroke(0);
fill(255);
ellipse(zoogX,zoogY - 30,60,60);
// Draw Zoog's eyes
eyeR = random(255);
eyeG = random(255);
eyeB = random(255);
fill(eyeR,eyeG,eyeB);
ellipse(zoogX - 19,zoogY - 30,16,32);
ellipse(zoogX + 19,zoogY - 30,16,32);
// Draw Zoog's legs
stroke(150);
line(zoogX - 10,zoogY + 50,zoogX - 10,height);
line(zoogX + 10,zoogY + 50,zoogX + 10,height);
// Zoog moves up
zoogY = zoogY - 1;
Feature #1. zoogX and zoogY are initialized based on
the size of the window. Note we cannot initialize these
variables before the size () function is called since we
are using the built-in variables width and height.
Feature #1. zoogX and zoogY are
used for the shape locations.
Feature #2. eyeR, eyeG, and eye B
are given random values and used
in the fi ll() function.
Feature #1. zoogY is decreased by one so
that zoog moves upward on the screen.
Exercise 4-6: Revise Example 4-8 so that Zoog shakes left and right as Zoog moves
upward. Hint: this requires the use of random( ) in combination with zoogX.
zoogX = _____________________________;
Exercise 4-7: Using variables and the random( ) function, revise your design from the
Lesson One Project to move around the screen, change color, size, location, and so on.