1 files changed, 31 insertions, 5 deletions

@@ -325,16 +325,11 @@ void Renderer::renderGame(
 
   SDL_SetRenderTarget(ren_.get(), nullptr);
 
-  // TODO: this is just moving interp. we also need zoom
   SDL_Rect zoomRect {
     TILE_WIDTH, TILE_HEIGHT, (windowTileWidth - 2) * TILE_WIDTH, (windowTileHeight - 2) * TILE_HEIGHT
   };
 
   if (game.moving) {
-    double interp =
-      static_cast<double>(game.zoomProgress) /
-        static_cast<double>(game.zoomLength);
-
     if (game.player_x > game.player_oldx) {
       zoomRect.x = game.moveProgress.getProgress(0, TILE_WIDTH);
     } else if (game.player_x < game.player_oldx) {
@@ -348,6 +343,37 @@ void Renderer::renderGame(
     }
   }
 
+  if (game.zooming) {
+    int oldWidth = game.oldZoom * ZOOM_X_FACTOR * TILE_WIDTH;
+    int oldHeight = game.oldZoom * ZOOM_Y_FACTOR * TILE_HEIGHT;
+
+    SDL_Rect oldRect {
+      zoomRect.w / 2 - oldWidth / 2,
+      zoomRect.h / 2 - oldHeight / 2,
+      oldWidth,
+      oldHeight
+    };
+
+    if (game.moving) {
+      if (game.player_x > game.player_oldx) {
+        oldRect.x += game.moveProgress.getProgress(0, TILE_WIDTH);
+      } else if (game.player_x < game.player_oldx) {
+        oldRect.x -= game.moveProgress.getProgress(TILE_WIDTH, 0);
+      }
+
+      if (game.player_y > game.player_oldy) {
+        oldRect.y += game.moveProgress.getProgress(0, TILE_HEIGHT);
+      } else if (game.player_y < game.player_oldy) {
+        oldRect.y -= game.moveProgress.getProgress(TILE_HEIGHT, 0);
+      }
+    }
+
+    zoomRect.x = game.zoomProgress.getProgress(oldRect.x, zoomRect.x);
+    zoomRect.y = game.zoomProgress.getProgress(oldRect.y, zoomRect.y);
+    zoomRect.w = game.zoomProgress.getProgress(oldRect.w, zoomRect.w);
+    zoomRect.h = game.zoomProgress.getProgress(oldRect.h, zoomRect.h);
+  }
+
   SDL_RenderCopy(ren_.get(), canvas.get(), &zoomRect, nullptr);
   SDL_RenderPresent(ren_.get());
 }