1 files changed, 67 insertions, 0 deletions

@@ -1,5 +1,6 @@
 #include "transform_system.h"
 #include "game.h"
+#include "map.h"
 
 void TransformSystem::initSprite(int spriteId, vec2i loc) {
   Sprite& sprite = game_.getSprite(spriteId);
@@ -18,3 +19,69 @@ void TransformSystem::moveSprite(int spriteId, vec2i newLoc) {
     spritesByY_.emplace(newLoc.y(), spriteId);
   }
 }
+
+CollisionResult TransformSystem::checkCollision(int spriteId, vec2i newLoc, Direction dir) {
+  CollisionResult result;
+
+  Sprite& sprite = game_.getSprite(spriteId);
+
+  const Map& map = game_.getMap();
+  bool blocked = false;
+
+  const vec2i UL_COL_BOX = { 8, 8 };
+  const vec2i DR_COL_BOX = { 4, 0 };
+  vec2i oldColPosUL = (sprite.loc - UL_COL_BOX) / map.getTileSize();
+  vec2i newColPosUL = (newLoc - UL_COL_BOX) / map.getTileSize();
+  vec2i oldColPosDR = (sprite.loc + DR_COL_BOX) / map.getTileSize();
+  vec2i newColPosDR = (newLoc + DR_COL_BOX) / map.getTileSize();
+
+  if (dirHasDir(sprite.dir, Direction::right) &&
+      newColPosDR.x() > oldColPosDR.x()) {
+    for (int y = newColPosUL.y(); y <= newColPosDR.y(); y++) {
+      if (map.isBlocked(newColPosDR.x(), y)) {
+        result.horiz.blocked = true;
+        result.horiz.dir = Direction::right;
+
+        break;
+      }
+    }
+  }
+
+  if (dirHasDir(sprite.dir, Direction::left) &&
+      newColPosUL.x() < oldColPosUL.x()) {
+    for (int y = newColPosUL.y(); y <= newColPosDR.y(); y++) {
+      if (map.isBlocked(newColPosUL.x(), y)) {
+        result.horiz.blocked = true;
+        result.horiz.dir = Direction::left;
+
+        break;
+      }
+    }
+  }
+
+  if (dirHasDir(sprite.dir, Direction::down) &&
+      newColPosDR.y() > oldColPosDR.y()) {
+    for (int x = newColPosUL.x(); x <= newColPosDR.x(); x++) {
+      if (map.isBlocked(x, newColPosDR.y())) {
+        result.vert.blocked = true;
+        result.vert.dir = Direction::down;
+
+        break;
+      }
+    }
+  }
+
+  if (dirHasDir(sprite.dir, Direction::up) &&
+      newColPosUL.y() < oldColPosUL.y()) {
+    for (int x = newColPosUL.x(); x <= newColPosDR.x(); x++) {
+      if (map.isBlocked(x, newColPosUL.y())) {
+        result.vert.blocked = true;
+        result.vert.dir = Direction::up;
+
+        break;
+      }
+    }
+  }
+
+  return result;
+}