Added MirrorSystem

This is really just for letting one sprite mirror another's movement and animation. I tried doing it in the BehaviourSystem, but you get stuttering if you do it earlier in the loop than the CharacterSystem, so I ended up having to make a new system just for this thing that will not happen very often.

1 files changed, 29 insertions, 0 deletions

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+#include "mirror_system.h"
+#include "game.h"
+#include "transform_system.h"
+#include "animation_system.h"
+#include "vector.h"
+#include "sprite.h"
+
+void MirrorSystem::tick(double dt) {
+  for (int spriteId : game_.getSprites()) {
+    Sprite& sprite = game_.getSprite(spriteId);
+    if (!sprite.paused) {
+      switch (sprite.mirrorType) {
+        case MirrorType::None: break;
+        case MirrorType::Vertical: {
+          Sprite& mirroredSprite = game_.getSprite(sprite.mirroredSpriteId);
+
+          vec2i mirroredLoc = mirroredSprite.loc;
+          mirroredLoc.y() = 2 * sprite.mirrorAxis - mirroredLoc.y();
+
+          game_.getSystem<TransformSystem>().moveSprite(spriteId, mirroredLoc);
+          game_.getSystem<AnimationSystem>().setSpriteAnimation(spriteId, mirroredSprite.animationName);
+          game_.getSystem<AnimationSystem>().setSpriteDirection(spriteId, directionMirroredVertically(mirroredSprite.dir));
+
+          break;
+        }
+      }
+    }
+  }
+}