add game state machine

TODO.org

@@ -4,7 +4,7 @@
 A flappy bird clone to get experience with Common Lisp and game development.
 
 
-* Game Plan [10/15]
+* Game Plan [11/15]
 - [X] Create bird, well, ball
 - [X] Add physics for ball movement
 - [X] Add inputs on key and mouse clicks
@@ -15,7 +15,7 @@ A flappy bird clone to get experience with Common Lisp and game development.
 - [X] Add background
 - [X] Create random pipes 
 - [X] Add goal after last pipe
-- [ ] Create state machine to manage start/play/finish
+- [X] Create state machine to manage start/play/finish
 - [ ] Add scores
 - [ ] Add high scores
 - [ ] Package for Mac/Linux/(Windows?)

flappy-ball.lisp

@@ -7,7 +7,6 @@
 (in-package :flappy-ball)
 
 
-
 ;; Create a new ball entity
 ;; (make-ball 10 20 -5.6)
 (defun make-ball (x y velocity size)
@@ -91,6 +90,7 @@
     (and (<= (- x bs) bx  (+ x w bs))
          (not (<= (+ h bs) by (- (+ h gap) bs))))))
 
+
 ;; -------------------------------------------------------------
 
 (defun draw-image-layer(resource scroll-x)
@@ -119,6 +119,8 @@
           collect (make-pipe x (+ padding (random (- max-height gap padding padding))) gap width)))
   )
 
+;; -------------------------------------------------------------
+
 
 (defsketch flappy-ball
     ((title "Flappy Ball")
@@ -132,35 +134,66 @@
      (ball-pen (make-pen :stroke (gray 0.5) :fill sketch:+yellow+ :weight 1))
      (collision-pen (make-pen :stroke (gray 0.5) :fill sketch:+red+ :weight 1))
      (pipe-pen (make-pen :stroke (gray 0.5) :fill sketch:+green+ :weight 1))
-     (pipes-amount 5)
+     (pipes-amount 1)
      (pipes-spacing 200)
-     (pipes (random-pipes pipes-amount pipes-spacing ground-level 100 20))
+     (pipes-width 20)
+     (pipes (random-pipes pipes-amount pipes-spacing ground-level 100 pipes-width))
      (scroll-x 0.0)
      (scroll-speed 0.2)
-     (target-x (- (* pipes-amount pipes-spacing) 720)))
+     (target-x (- (* pipes-amount pipes-spacing) 720))
+     (state 'new))
 
   (draw-background scroll-x)
   (draw-foreground pipes scroll-x pipe-pen height)
   
   (ball-draw ball
              (if (some (lambda (pipe) (pipe-collides pipe ball scroll-x)) pipes)
-                 collision-pen
+                 (progn
+                   (when (eq state 'running)
+                     (setf state 'died))
+                   collision-pen)
                  ball-pen))
 
+  (when (eq state 'new)
+    (setf scroll-x 0.0)
+    (text "Click to Start" 350 250 200 40))
+  (when (eq state 'won)
+    (text "You Won" 400 100 120 40))
+  (when (eq state 'died)
+    (text "You Died" 400 250 120 40))
+
   (if (>= scroll-x target-x)
       (let ((pic (load-resource "assets/level1/prize.png")))
         (draw pic :x (- (+ 960 target-x) scroll-x) :y 0 )))
 
+  (when (eq state 'running)
     (setf scroll-x (+ scroll-x scroll-speed))
-  (setf ball (ball-move ball gravity ground-level)))
+    (setf ball (ball-move ball gravity ground-level))
+    (when (> scroll-x (+ (* pipes-amount pipes-spacing) pipes-width))
+      (setf state 'won)))  
+  )
 
 (defmethod on-click ((instance flappy-ball) x y)
-  (with-slots (ball flap-speed) instance
-    (setf ball (ball-flap ball flap-speed))))
+  (with-slots (ball flap-speed state) instance
+    (setf ball (ball-flap ball flap-speed))
+    (when (eq state 'new)
+      (setf state 'running))
+    (when (eq state 'died)
+      (setf state 'new))
+    (when (eq state 'won)
+      (setf state 'new))
+    ))
 
 (defmethod on-key ((instance flappy-ball) key state)
-  (with-slots (ball flap-speed) instance
-    (setf ball (ball-flap ball flap-speed))))
+  (with-slots (ball flap-speed state) instance
+    (setf ball (ball-flap ball flap-speed))
+    (when (eq state 'new)
+      (setf state 'running))
+    (when (eq state 'died)
+      (setf state 'new))
+    (when (eq state 'won)
+      (setf state 'new))
+    ))
 
   (defmethod setup ((instance flappy-ball) &key &allow-other-keys)
     (background (gray 1)))