Fixed edges of the screen slowing you down.

And unlike a fix I previously did, this one is perfect. Rather than
fiddling with ssx and ssy, I just added some new variables, smx and
smy.

src/aliens.cpp

@@ -1219,9 +1219,9 @@ void doAliens()
 			}
 
 			if ((currentGame.area != 18) || (theEnemy->shield < 0))
-				theEnemy->x += engine.ssx;
+				theEnemy->x += engine.ssx + engine.smx;
 
-			theEnemy->y += engine.ssy;
+			theEnemy->y += engine.ssy + engine.smy;
 		}
 
 		theEnemy++;

src/bullets.cpp

@@ -43,7 +43,7 @@ void addBullet(object *theWeapon, object *attacker, int y, int dy)
 	{
 		bullet->dx = theWeapon->speed;
 		if ((currentGame.area == 18) || (currentGame.area == 24))
-			bullet->dx += fabsf(engine.ssx);
+			bullet->dx += fabsf(engine.ssx + engine.smx);
 	}
 	else
 	{
@@ -556,8 +556,8 @@ void doBullets()
 					bullet->target = NULL;
 			}
 
-			bullet->x += engine.ssx;
-			bullet->y += engine.ssy;
+			bullet->x += engine.ssx + engine.smx;
+			bullet->y += engine.ssy + engine.smy;
 
 			for (int i = 0 ; i < MAX_ALIENS ; i++)
 			{

src/cargo.cpp

@@ -96,8 +96,8 @@ void doCargo()
 
 			blit(cargo[i].image[0], (int)cargo[i].x, (int)cargo[i].y);
 
-			cargo[i].x += engine.ssx;
-			cargo[i].y += engine.ssy;
+			cargo[i].x += engine.ssx + engine.smx;
+			cargo[i].y += engine.ssy + engine.smy;
 
 			limitFloat(&cargo[i].x, cargo[i].owner->x - 50, cargo[i].owner->x + 50);
 			limitFloat(&cargo[i].y, cargo[i].owner->y - 50, cargo[i].owner->y + 50);

src/collectable.cpp

@@ -242,8 +242,8 @@ void doCollectables()
 			if ((collectable->x + collectable->image->w > 0) && (collectable->x < 800) && (collectable->y + collectable->image->h > 0) && (collectable->y < 600))
 				blit(collectable->image, (int)collectable->x, (int)collectable->y);
 
-			collectable->x += engine.ssx;
-			collectable->y += engine.ssy;
+			collectable->x += engine.ssx + engine.smx;
+			collectable->y += engine.ssy + engine.smx;
 			collectable->x += collectable->dx;
 			collectable->y += collectable->dy;
 

src/debris.cpp

@@ -67,8 +67,8 @@ void doDebris()
 		{
 			debris->thinktime--;
 
-			debris->x += engine.ssx;
-			debris->y += engine.ssy;
+			debris->x += engine.ssx + engine.smx;
+			debris->y += engine.ssy + engine.smy;
 			debris->x += debris->dx;
 			debris->y += debris->dy;
 

src/explosions.cpp

@@ -78,8 +78,8 @@ void doExplosions()
 
 		if (explosion->active)
 		{
-			explosion->x += engine.ssx;
-			explosion->y += engine.ssy;
+			explosion->x += engine.ssx + engine.smx;
+			explosion->y += engine.ssy + engine.smy;
 	
 			if (isOnScreen((int)explosion->x, (int)explosion->y, explosion->image[0]->w, explosion->image[0]->h))
 				blit(explosion->image[0], (int)explosion->x, (int)explosion->y);

src/game.cpp

@@ -109,6 +109,8 @@ int mainGameLoop()
 
 	engine.ssx = 0;
 	engine.ssy = 0;
+	engine.smx = 0;
+	engine.smy = 0;
 
 	engine.done = 0;
 

src/globals.cpp

@@ -29,6 +29,8 @@ void defineGlobals()
 
 	engine.ssx = 0;
 	engine.ssy = 0;
+	engine.smx = 0;
+	engine.smy = 0;
 
 	engine.bulletHead = new object;
 	engine.bulletHead->next = NULL;

src/graphics.cpp

@@ -711,8 +711,10 @@ void doStarfield()
 		else if (star[i].speed == 1)
 			color = darkGrey;
 
-		wrapFloat(&(star[i].x += (engine.ssx * star[i].speed)), 0, screen->w - 1);
-		wrapFloat(&(star[i].y += (engine.ssy * star[i].speed)), 0, screen->h - 1);
+		wrapFloat(&(star[i].x += ((engine.ssx + engine.smx) * star[i].speed)), 0,
+			screen->w - 1);
+		wrapFloat(&(star[i].y += ((engine.ssy + engine.smy) * star[i].speed)), 0,
+			screen->h - 1);
 
 		putpixel(screen, (int)star[i].x, (int)star[i].y, color);
 		r.x = (int)star[i].x;

src/intermission.cpp

@@ -514,7 +514,8 @@ int galaxyMap()
 
 	engine.done = 0;
 	engine.keyState[KEY_FIRE] = 0;
-	engine.ssx = engine.ssy = 0;
+	engine.ssx = 0;
+	engine.ssy = 0;
 
 	SDL_Rect r;
 	SDL_Rect destRect;

src/player.cpp

@@ -76,6 +76,9 @@ void doPlayer()
 	engine.ssx *= 0.99;
 	engine.ssy *= 0.99;
 
+	engine.smx = 0;
+	engine.smy = 0;
+
 	int shapeToUse;
 
 	if (player.shield > -100)
@@ -190,8 +193,26 @@ void doPlayer()
 
 			if (engine.done == 0)
 			{
-				limitFloat(&player.x, viewBorder, screen->w - viewBorder);
-				limitFloat(&player.y, viewBorder, screen->h - viewBorder);
+				if (player.x < viewBorder)
+				{
+					engine.smx += viewBorder - player.x;
+					player.x = viewBorder;
+				}
+				else if (player.x > screen->w - viewBorder)
+				{
+					engine.smx += (screen->w - viewBorder) - player.x;
+					player.x = screen->w - viewBorder;
+				}
+				if (player.y < viewBorder)
+				{
+					engine.smy += viewBorder - player.y;
+					player.y = viewBorder;
+				}
+				else if (player.y > screen->h - viewBorder)
+				{
+					engine.smy += (screen->h - viewBorder) - player.y;
+					player.y = screen->h - viewBorder;
+				}
 			}
 
 			if (player.shield > engine.lowShield)

src/script.cpp

@@ -189,6 +189,8 @@ void doCutscene(int scene)
 
 	engine.ssx = -0.5;
 	engine.ssy = 0;
+	engine.smx = 0;
+	engine.smy = 0;
 
 	flushBuffer();
 	freeGraphics();
@@ -253,7 +255,7 @@ void doCutscene(int scene)
 				}
 				enemy[i].x += enemy[i].dx;
 				enemy[i].y += enemy[i].dy;
-				enemy[i].x += engine.ssx;
+				enemy[i].x += engine.ssx + engine.smx;
 				blit(enemy[i].image[0], (int)enemy[i].x, (int)enemy[i].y);
 				if (enemy[i].x > (screen->w + 50))
 				{

src/structs.h

@@ -230,6 +230,8 @@ struct globalEngineVariables {
 
 	float ssx;
 	float ssy;
+	float smx;
+	float smy;
 
 	Mix_Music *music;
 

src/title.cpp

@@ -217,6 +217,8 @@ int doTitle()
 	// Set the star motion
 	engine.ssx = -0.5;
 	engine.ssy = 0;
+	engine.smx = 0;
+	engine.smy = 0;
 
 	int then = SDL_GetTicks();
 	int now;