A starting point for class, Feb. 26.

function_invaders.pde

// TODO: your name
// Decomposing space invaders, for function re-use
// Focusing on remaining ships and the forts.

final int TEXT_SIZE = 32;
color green = color(0, 200, 0);
color white = color(255);

int shipsLeft = 4;
int credit = 0;

void setup() {
  size(640, 480);
  background(0);
}

void draw() {
  drawBottomStatusBar();
  // to be continued ...
}

void drawBottomStatusBar() {
  drawBottomStatusBarLine();
  drawCreditLeft();
  drawNumberOfShipsLeft();
  drawShipsLeft();

}

void drawBottomStatusBarLine() {
  stroke(green);
  line(0, height - 50, width, height - 50);
}

void drawNumberOfShipsLeft() {
  setBottomBarTextStyle();
  text(shipsLeft, 10, height - 20);
}

void drawShipsLeft() {
  drawRemainingShip(0);
  drawRemainingShip(1);
  drawRemainingShip(2);
  drawRemainingShip(3);
}

void drawRemainingShip(int shipNumber) {
  // TODO
  // draw each Nth ship in a position relative to coordinate (50, 440).
}

// Draws 0X when X, the credit left, is less than 10.
// Otherwise draws the amount of credit left.
void drawCreditLeft() {
  setBottomBarTextStyle();
  text("CREDIT", width - (TEXT_SIZE * 6), height - 20);
  // TODO: Implement this
}

// Notice how this function just encapsulates repetitive
// code that is used by both drawShipsLeft and drawCreditLeft.
void setBottomBarTextStyle() {
  fill(white);
  textSize(TEXT_SIZE);
}