From c6cfb28a353568126195dc4e94cb89d183fa5c8d Mon Sep 17 00:00:00 2001
From: Matt Mullins <mokomull@gmail.com>
Date: Sat, 30 Oct 2010 21:11:46 -0500
Subject: [PATCH] Fixed the background code.

---
 Background.cpp | 90 ++++++++++++++++++++++++++++++++--------------------------
 1 file changed, 49 insertions(+), 41 deletions(-)

diff --git a/Background.cpp b/Background.cpp
index a90a4b8..7af7dd5 100644
--- a/Background.cpp
+++ b/Background.cpp
@@ -27,51 +27,59 @@ void Background::draw(){
 	/** \todo decide if wrapping should be a good default.*/
 	///destination rectangle only position is used and describes where the output is drawn.
 	SDL_Rect dest;///<the place where the sample will be drawn (can be reused)
-	dest.x=0;
-	dest.y=0;
 	double x = mPos.X, y = mPos.Y;
-	while(x > mScreenSize.width)//move it to the left til it's 0 or less
-		x-=mScreenSize.width;
-	while(y > mScreenSize.height)//move it down til it's 0 or less
-		y-=mScreenSize.height;
-	while(x < 0)//move it to the right until it's in the drawable area
-		x+=mScreenSize.width;
-	while(y < 0)//move it up til it's 
-		y+=mScreenSize.height;
+	while (x > mScreenSize.width) // move it to the left til it's on the screen
+		x -= mScreenSize.width;
+	while (y > mScreenSize.height) // move it up til it's on the screen
+		y -= mScreenSize.height;
+	while (x < 0) // move it to the right until it's in the drawable area
+		x += mScreenSize.width;
+	while (y < 0) // move it down til it's on the screen
+		y += mScreenSize.height;
 
-	if(wrapping){
-		SDL_Rect extraX;///<keeps track of pos and size of the sample that hangs off the x
-		SDL_Rect extraY;///<keeps track of pos and size of the sampel hanging off y
+	if (wrapping) {
+		SDL_Rect source;
 
-		//horizontal wrapping
-		if(x > 0 ){
-			extraX.x = mScreenSize.width - x;	
-			extraX.y = y;	
-			extraX.w = x;
-			extraX.h = mScreenSize.height - y;	
-			SDL_BlitSurface(mBackground, &extraX, mScreen, &dest);
-		}
-		/// \todo vertical wrapping
-		if(y > 0){
-			extraX.x = x;
-			extraX.y = mScreenSize.height + y;	
-			extraX.w = mScreenSize.width + x;
-			extraX.h = y;	
-			SDL_BlitSurface(mBackground, &extraX, mScreen, &dest);
-		}
-		/*
-		if(x + _imageSize.width < mScreenSize.width){
-			extraX.x = 0;
-			extraX.y = 0;
-			extraX.w = -x;
-			extraX.h = mScreenSize.height;	
-			SDL_BlitSurface(mBackground, &extraX, mScreen, &dest);
-		}//*/
-	}
-	dest.x = x;
-	dest.y = y;
-	SDL_BlitSurface(mBackground, &source, mScreen, &dest);
+		// Top-left portion of image
+		dest.x = x;
+		dest.y = y;
+		source.x = 0;
+		source.y = 0;
+		source.w = mScreenSize.width - x;
+		source.h = mScreenSize.height - y;
+		SDL_BlitSurface(mBackground, &source, mScreen, &dest);
+
+		// Top-right portion of image
+		dest.x = 0;
+		dest.y = y;
+		source.x = mScreenSize.width - x;
+		source.y = 0;
+		source.w = x;
+		source.h = mScreenSize.height - y;
+		SDL_BlitSurface(mBackground, &source, mScreen, &dest);
 
+		// Lower-left portion of image
+		dest.x = 0;
+		dest.y = 0;
+		source.x = mScreenSize.width - x;
+		source.y = mScreenSize.height - y;
+		source.w = x;
+		source.h = y;
+		SDL_BlitSurface(mBackground, &source, mScreen, &dest);
+
+		// Lower-right portion of image
+		dest.x = x;
+		dest.y = 0;
+		source.x = 0;
+		source.y = mScreenSize.height - y;
+		source.w = mScreenSize.width - x;
+		source.h = y;
+		SDL_BlitSurface(mBackground, &source, mScreen, &dest);
+	} else {
+		dest.x = mPos.X;
+		dest.y = mPos.Y;
+		// SDL_BlitSurface(mBackground, &source, mScreen, &dest);
+	}
 }
 
 SDL_Surface* Background::load(std::string filename){
-- 
2.11.0