Basic combat

src/arena.scm

@@ -0,0 +1,361 @@
+(module (arena) ()
+(import scheme
+	(chicken base)
+	(chicken module)
+	(chicken string)
+	(imugi core)
+	(imugi input)
+	(imugi scene)
+	(imugi math)
+	(bd ui)
+	(bd random)
+	(bd attack)
+	(bd grid)
+	(srfi 1)
+	(srfi 99))
+
+(define battle-state 'active)
+
+(define player 'player)
+(define enemy 'foe)
+(define empty 'none)
+
+(define grid-size 5)
+
+(define field (grid grid-size grid-size empty))
+
+(define-record-type <unit>
+  (unit type health pos hand-pos stance)
+  unit?
+  (type unit-type)
+  (health unit-health set-unit-health!)
+  (pos unit-pos set-unit-pos!)
+  (hand-pos unit-hand-pos set-unit-hand-pos!)
+  (stance unit-stance set-unit-stance!))
+
+(define player-unit
+  (unit
+    player
+    3
+    ;; Place player
+    (vec (rand-int grid-size)
+	 (rand-int grid-size))
+    (hand-direction 'mid 'right)
+    'mid))
+
+(define enemy-unit
+  (unit
+    enemy
+    3
+    ;; Place enemy
+    (let loop ()
+      (let ((p-x (rand-int grid-size))
+	    (p-y (rand-int grid-size)))
+	(if (not (v= (vec p-x p-y)
+		     (unit-pos player-unit)))
+	    (vec p-x p-y)
+	    (loop))))
+    (hand-direction 'mid 'left)
+    'mid))
+
+(define-record-type <order>
+  (order movement attack stance)
+  order?
+  (movement order-mov set-order-mov!)
+  (attack order-atk set-order-atk!)
+  (stance order-stance set-order-stance!))
+
+(define (empty-order)
+  (order #f
+	 #f
+	 #f))
+
+(define player-order
+  (empty-order))
+
+(define (possible-enemy-moves)
+  (filter
+   (lambda (p)
+     (let ((res (v+ p (unit-pos enemy-unit))))
+       (and (> 5 (v-x res) -1)
+	    (> 5 (v-y res) -1))))
+   (list (vec 0 1)
+	 (vec 0 -1)
+	 (vec 1 0)
+	 (vec -1 0))))
+
+(define (distance-between-units)
+  (let* ((p-pos (unit-pos player-unit))
+	 (e-pos (unit-pos enemy-unit))
+	 (d-x (abs (- (v-x p-pos) (v-x e-pos))))
+	 (d-y (abs (- (v-y p-pos) (v-y e-pos)))))
+    (+ d-x d-y)))
+
+(define (enemy-order)
+  (let ((o (empty-order)))
+    ;; Movement AI
+    (set-order-mov! o
+		    (if (= 1 (unit-health enemy-unit))
+			(pick-random (possible-enemy-moves))
+			(if (and (< 0.4 (random))
+				 (< 1 (distance-between-units)))
+			    (pick-random (possible-enemy-moves))
+			    #f)))
+    (when (< 0.5 (random))
+      (set-order-stance! o (pick-random '(high mid low))))
+    (set-order-atk!
+     o
+     (let ((roll (random)))
+       (cond
+	((> 0.6 roll) (unit-hand-pos enemy-unit))
+	((> 0.8 roll) (rotate-pos-cc (unit-hand-pos enemy-unit)))
+	(else (rotate-pos (unit-hand-pos enemy-unit))))))
+    o))
+
+(define (attempt-attack attack-dir unit)
+  (display (unit-type unit))
+  (newline)
+  (let* ((target (if (eqv? (unit-type unit) player) enemy-unit player-unit))
+	 (outcome (resolve-combat (attack-from-stance attack-dir (unit-stance unit))
+				  (defense-from-stance attack-dir
+				    (unit-hand-pos target)
+				    (unit-stance unit)))))
+    (if (eqv? outcome 'hit)
+	(begin
+	  (display (conc (unit-type unit) " hits!"))
+	  (set-unit-health! target (- (unit-health target) 1))
+	  (when (= 0 (unit-health target))
+	    (set! battle-state 'ended)))
+	(display (conc (unit-type unit) " misses!")))
+    (newline)
+    (set-unit-hand-pos! unit (opposite-pos attack-dir))))
+
+(define (move-unit unit pos)
+  (let ((target (if (eqv? (unit-type unit) player) enemy-unit player-unit)))
+    (unless (v= (unit-pos target) pos)
+      (set-unit-pos! unit pos))))
+
+(define (apply-order order unit)
+  (when (order-mov order)
+    (move-unit unit (v+ (unit-pos unit) (order-mov order))))
+  (when (order-stance order)
+    (set-unit-stance! unit (order-stance order)))
+  (when (and (order-atk order)
+	     (= 1 (distance-between-units)))
+    (attempt-attack (order-atk order) unit)))
+
+(define update-grid-entities
+  (make-system
+   'update-grid-entities
+   0
+   'entity
+   '(<grid-view>)
+   (lambda (_ g)
+     (let ((gd (grid-view-grid g)))
+       (do ((i 0 (+ 1 i)))
+	   ((= i (length gd)) gd)
+	 (let ((row (list-ref gd i)))
+	   (do ((j 0 (+ 1 j)))
+	       ((= j (length row)) row)
+	     (gv! gd j i (cond
+			  ((v= (unit-pos player-unit) (vec j i)) player)
+			  ((v= (unit-pos enemy-unit) (vec j i)) enemy)
+			  (else empty))))))))))
+
+(export arena)
+(define (arena)
+  (scene
+   push-actions
+   process-dynamic-labels
+   update-grid-entities
+   draw-labels
+   draw-grid
+   handle-buttons
+   
+   ;; Level heading
+   (entity
+    (subtitle
+     (vec
+      0
+      10)
+     "Fight!"
+     centered: (cons #t #f)))
+   
+   ;; Grid view
+   (entity
+    (grid-view
+     (vec 190 100)
+     field
+     75))
+
+   ;; Stance inputs
+   (entity
+    (button
+     (vec 50
+	  460)
+     (footer (vec 0 0)
+	     "High Stance!")
+     (lambda ()
+       (set-order-stance! player-order 'high))
+     size: (vec 100 30)))
+   (entity
+    (button
+     (vec 50
+	  500)
+     (footer (vec 0 0)
+	     "Mid Stance!")
+     (lambda ()
+       (set-order-stance! player-order 'mid))
+     size: (vec 100 30)))
+   (entity
+    (button
+     (vec 50
+	  540)
+     (footer (vec 0 0)
+	     "Low Stance!")
+     (lambda ()
+       (set-order-stance! player-order 'low))
+     size: (vec 100 30)))
+   
+   ;; Attack inputs
+   (entity
+    (button
+     (vec 12
+	  320)
+     (footer (vec 0 0)
+	     "Atk: Counter-clockwise")
+     (lambda ()
+       (set-order-atk! player-order (rotate-pos-cc (unit-hand-pos player-unit))))
+     size: (vec 175 30)))
+   (entity
+    (button
+     (vec 12
+	  360)
+     (footer (vec 0 0)
+	     "Atk: From position!")
+     (lambda ()
+       (set-order-atk! player-order (unit-hand-pos player-unit)))
+     size: (vec 175 30)))
+   (entity
+    (button
+     (vec 12
+	  400)
+     (footer (vec 0 0)
+	     "Atk: Clockwise!")
+     (lambda ()
+       (set-order-atk! player-order (rotate-pos (unit-hand-pos player-unit))))
+     size: (vec 175 30)))
+
+   ;; Move inputs
+   (entity
+    (button
+     (vec 185
+	  517)
+     (footer (vec 0 0)
+	     "<")
+     (lambda ()
+       (when (< 0 (v-y (unit-pos player-unit)))
+	 (set-order-mov! player-order (vec 0 -1))))
+     size: (vec 30 30)))
+   (entity
+    (button
+     (vec 255
+	  517)
+     (footer (vec 0 0)
+	     ">")
+     (lambda ()
+       (when (> 4 (v-y (unit-pos player-unit)))
+	 (set-order-mov! player-order (vec 0 1))))
+     size: (vec 30 30)))
+   (entity
+    (button
+     (vec 220
+	  500)
+     (footer (vec 0 0)
+	     "^")
+     (lambda ()
+       (when (< 0 (v-x (unit-pos player-unit)))
+	 (set-order-mov! player-order (vec -1 0))))
+     size: (vec 30 30)))
+   (entity
+    (button
+     (vec 220
+	  535)
+     (footer (vec 0 0)
+	     "v")
+     (lambda ()
+       (when (> 4 (v-x (unit-pos player-unit)))
+	 (set-order-mov! player-order (vec 1 0))))
+     size: (vec 30 30)))
+   
+   ;; End turn button
+   (entity
+    (button
+     (vec (- (/ (car (*window-size*))
+		2)
+	     50)
+	  500)
+     (footer (vec 0 0)
+	     "Submit Order")
+     (lambda ()
+       (when (eqv? battle-state 'active)
+	 (let ((o (enemy-order)))
+	   (apply-order player-order player-unit)
+	   (apply-order o enemy-unit)
+	   (set! player-order (empty-order)))))))
+   
+   ;; Player data display
+   (entity
+    (footer
+     (vec 0 0)
+     ""
+     centered: (cons #f #t))
+    (dynamic-label
+     (lambda ()
+       (conc (unit-health player-unit) "/3\n"
+	     "Your hand is "
+	     (direction-to-string (unit-hand-pos player-unit))
+	     "\nStance: " (symbol->string (unit-stance player-unit))))))
+
+   ;; Player order display
+   (entity
+    (footer
+     (vec 0 0)
+     "")
+    (dynamic-label
+     (lambda ()
+       (conc "Order:\n Move: "
+	     (if (order-mov player-order)
+		 (let ((m (order-mov player-order)))
+		   (cond
+		    ((v= (vec 1 0) m) "Down")
+		    ((v= (vec -1 0) m) "Up")
+		    ((v= (vec 0 1) m) "Right")
+		    ((v= (vec 0 -1) m) "Left")))
+		 "No change")
+	     "\nAttack: " (if (order-atk player-order)
+			      (direction-to-string (order-atk player-order))
+			      "No change")
+	     "\nStance: " (if (order-stance player-order)
+			      (order-stance player-order)
+			      "No change")))))
+   
+   ;; Enemy data display
+   (entity
+    (footer
+     (vec 600 0)
+     ""
+     centered: (cons #f #t))
+    (dynamic-label
+     (lambda ()
+       (conc (unit-health enemy-unit) "/3\n"
+	     "Their hand is "
+	     (direction-to-string (unit-hand-pos enemy-unit))
+	     "\nStance: " (symbol->string (unit-stance enemy-unit))))))
+
+   (entity
+    player-unit)
+   (entity
+    enemy-unit)
+   ))
+)

src/bitter-duel.scm

@@ -4,12 +4,14 @@
 	raylib
 	(imugi core)
 	(imugi input)
-	(main-menu))
+	(main-menu)
+	(arena))
 
 (register-action 'click 'mouse-press MOUSE_BUTTON_LEFT)
 
 ((main-menu (lambda ()
 	      (display "Loading game scene...")
-	      (newline))))
+	      (newline)
+	      ((arena)))))
 
 (create-window))