Level: Implement horizontally scrolling levels/camera

2 files changed, 17 insertions, 2 deletions

diff --git a/Level.cpp b/Level.cpp
index ac860b3..7da0bf4 100644
--- a/Level.cpp
+++ b/Level.cpp
@@ -40,6 +40,8 @@ void Level::changeLevel(int levelNo) {
 
     // Read the map file (all level/player init should be done here, not above)
     loadMap(levelNo);
+
+    cameraX = 0;
 }
 
 void Level::move() {
@@ -79,11 +81,22 @@ void Level::draw(Screen *screen) {
 
     screen->blit(player.getX(), player.getY(), player.image, player.getClip());
 
+    // Scroll level
+    if (player.getX() == 0 || player.getX() >= SCREEN_WIDTH - MARCUS_WIDTH - 10) {
+        if (player.getXVel() < 0 || player.getXVel() > 0)
+            cameraX -= player.getXVel();
+    }
+
+    // Don't let the camera move to before the start of the level
+    if (cameraX > 0)
+            cameraX = 0;
+
     // Draw each platform...
     for (int i = 0; i < numPlatforms; i++) {
         // ...if it is visible
-        if (platform[i].getX() + TILE_SIZE >= 0 && platform[i].getX() <= SCREEN_WIDTH) {
-            screen->blit(platform[i].getX(), platform[i].getY(),
+        if (platform[i].getX() + TILE_SIZE + cameraX >= 0 && platform[i].getX()
+            + cameraX <= SCREEN_WIDTH) {
+            screen->blit(platform[i].getX() + cameraX, platform[i].getY(),
                          platform[0].image, platform[i].getClip());
         }
     }
diff --git a/Level.h b/Level.h
index 774164e..b6ca8c6 100644
--- a/Level.h
+++ b/Level.h
@@ -31,6 +31,8 @@ class Level {
 
         // Reads in the map file
         void loadMap(int levelNo);
+
+        int cameraX;
 };
 
 #endif