From 6b4f2d5ebf81d7eea262ce45ae189e79b103cb09 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Sun, 6 Jan 2019 23:19:46 -0500
Subject: examples: game-controller: Add left/right trigger rendering.

---
 examples/game-controller.scm | 68 +++++++++++++++++++++++++-------------------
 1 file changed, 38 insertions(+), 30 deletions(-)

(limited to 'examples')

diff --git a/examples/game-controller.scm b/examples/game-controller.scm
index fe1a681..252f368 100644
--- a/examples/game-controller.scm
+++ b/examples/game-controller.scm
@@ -1,5 +1,6 @@
 (use-modules (chickadee)
              (chickadee math vector)
+             (chickadee render color)
              (chickadee render font)
              (chickadee render sprite)
              (chickadee render texture)
@@ -23,6 +24,9 @@
     (right-stick ,(vec2 450.0 20.0) 13 31)
     (left-shoulder ,(vec2 110.0 390.0) 4 22)
     (right-shoulder ,(vec2 450.0 390.0) 5 23)))
+(define trigger-icons
+  `((trigger-left ,(vec2 10.0 390.0) 22)
+    (trigger-right ,(vec2 550.0 390.0) 23)))
 (define no-controller-msg "no controller detected   :'(")
 (define no-controller-msg-pos #f)
 (define controller-name-pos #f)
@@ -40,38 +44,42 @@
   (set! controller-name-pos
         (vec2 (center-text (controller-name controller)) 440.0)))
 
-;; FIXME: I couldn't think of a decent way to display the analog
-;; left/right trigger buttons, so they are omitted.
 (define (draw alpha)
   (if controller
-      (begin
-        (draw-text (controller-name controller) controller-name-pos)
-        (for-each (match-lambda
-                    (((and (or 'left-stick 'right-stick) button)
-                      p released pressed)
-                     (let ((pressed? (controller-button-pressed? controller
-                                                                 button))
-                           (x (controller-axis controller
-                                               (if (eq? button 'left-stick)
-                                                   'left-x
-                                                   'right-x)))
-                           (y (controller-axis controller
-                                               (if (eq? button 'left-stick)
-                                                   'left-y
-                                                   'right-y))))
-                       (draw-sprite (texture-atlas-ref atlas released)
-                                    p)
-                       (when (or pressed? (not (zero? x)) (not (zero? y)))
-                         (draw-sprite (texture-atlas-ref atlas pressed)
-                                      (vec2+ p (vec2 (* x 16.0) (* y -16.0)))))))
-                    ((button p released pressed)
-                     (let ((pressed? (controller-button-pressed? controller
-                                                                 button)))
-                       (draw-sprite (texture-atlas-ref
-                                     atlas
-                                     (if pressed? pressed released))
-                                    p))))
-                  button-icons))
+      (with-batched-sprites
+       (draw-text (controller-name controller) controller-name-pos)
+       (for-each (match-lambda
+                   ((axis p tile)
+                    (let ((alpha (controller-axis controller axis)))
+                      (draw-sprite (texture-atlas-ref atlas tile) p
+                                   #:tint (color 1.0 1.0 1.0 alpha)))))
+                 trigger-icons)
+       (for-each (match-lambda
+                   (((and (or 'left-stick 'right-stick) button)
+                     p released pressed)
+                    (let ((pressed? (controller-button-pressed? controller
+                                                                button))
+                          (x (controller-axis controller
+                                              (if (eq? button 'left-stick)
+                                                  'left-x
+                                                  'right-x)))
+                          (y (controller-axis controller
+                                              (if (eq? button 'left-stick)
+                                                  'left-y
+                                                  'right-y))))
+                      (draw-sprite (texture-atlas-ref atlas released)
+                                   p)
+                      (when (or pressed? (not (zero? x)) (not (zero? y)))
+                        (draw-sprite (texture-atlas-ref atlas pressed)
+                                     (vec2+ p (vec2 (* x 16.0) (* y -16.0)))))))
+                   ((button p released pressed)
+                    (let ((pressed? (controller-button-pressed? controller
+                                                                button)))
+                      (draw-sprite (texture-atlas-ref
+                                    atlas
+                                    (if pressed? pressed released))
+                                   p))))
+                 button-icons))
       (draw-text no-controller-msg no-controller-msg-pos)))
 
 (run-game #:load load #:draw draw #:controller-add controller-add)
-- 
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