From 055f7a0c767a202e6b2711c57f7a792a69c129f1 Mon Sep 17 00:00:00 2001
From: neingeist <neingeist@bl0rg.net>
Date: Mon, 20 May 2002 16:45:17 +0000
Subject: [PATCH] - b0rk

---
 cscape.c | 56 ++++++++++++++++++++++++++++----------------------------
 sdl.c    |  3 ++-
 sdl.h    |  2 ++
 3 files changed, 32 insertions(+), 29 deletions(-)

diff --git a/cscape.c b/cscape.c
index 6edb43d..9dabbc2 100644
--- a/cscape.c
+++ b/cscape.c
@@ -9,7 +9,7 @@
 
 #define MEERESSPIEGEL 48
 #define BLICKWEITE    55
-#define FLUGHOEHE     30
+#define FLUGHOEHE     100
 #define MAPSIZE       256
 
 int sintab[360];
@@ -37,7 +37,7 @@ void fly(SDL_Surface *screen) {
 	int iy, ix, iy1, iyp, ixp;
 	int x, y, z, s, i, j;
 	int map_color;
-	int rng[320];
+	int rng[WIDTH];
 
 	if(SDL_MUSTLOCK(screen))
                 if(SDL_LockSurface(screen) < 0) {
@@ -47,62 +47,62 @@ void fly(SDL_Surface *screen) {
                 }
 	
 	/* Richtung wechseln? */
-	/* if (java.lang.Math.random()<0.5)
-	if (java.lang.Math.random()<1.0)
-	if (richtung <= 0) richtung = 357;
-	else richtung -= 3;
-	else
-	if (richtung >= 357) richtung = 0;
-	else richtung += 3;
-	*/
+	if (rand()<RAND_MAX/2) {
+		if (rand()<RAND_MAX) {
+			if (richtung <= 0) { richtung = 357; }
+			else { richtung -= 3; }
+		} else {
+			if (richtung >= 357) { richtung = 0; }
+			else { richtung += 3; }
+		}
+	}
 	
 	/* Bewegen ... */	
 	posy = posy + costab[richtung] / 32;
 	posx = posx + sintab[richtung] / 32;
 
-	posy %= MAPSIZE;
-	posx %= MAPSIZE;
+	posy %= MAPSIZE; if(posy<0) posy+=MAPSIZE;
+	posx %= MAPSIZE; if(posx<0) posx+=MAPSIZE;
 
 	/* Absolute Höhe berechnen */
-	flughoehe = 100; 
-	/* flughoehe = FLUGHOEHE + ... */
+	flughoehe = FLUGHOEHE + map[posy*MAPSIZE+posx]/2;
 	
 	/* FIXME */
-	for (i=0;i<320;i++) rng[i] = 200;
+	for (i=0;i<WIDTH;i++) rng[i] = HEIGHT;
   
 
 	SDL_FillRect(screen, NULL, 0);
 	
 	for (iy=posy; iy<=posy+BLICKWEITE; iy++) {
 		iy1 = 2 * (iy-posy) + 1;
-		s = 4 + 300 / iy1;
+		s = 4 + (WIDTH-20) / iy1;
 
 		for (ix=posx-(iy-posy); ix<=posx+(iy-posy); ix++) {
 
 			ixp = posx 
 				+ ((ix-posx) * costab[richtung] 
-				+ (iy-posy) * sintab[richtung]) / 128;
+				+ (iy-posy) * sintab[richtung]) /(MAPSIZE/2);
 			iyp = posy 
 				+ ((iy-posy) * costab[richtung]
-				- (ix-posx) * sintab[richtung]) / 128;
+				- (ix-posx) * sintab[richtung]) /(MAPSIZE/2);
 
-			x = 160 + 360*(ix-posx) / iy1;
+			x = WIDTH/2 + 360*(ix-posx) / iy1;
 
 			if(
-				(x>=0) && (x+s<=318) 
-				&& ((256*iyp+ixp) > 0) 
-				&& ((256*iyp+ixp) < 256*256)
+				(x>=0) && (x+s<=WIDTH-2) 
+				&& ((MAPSIZE*iyp+ixp) > 0) 
+				&& ((MAPSIZE*iyp+ixp) < MAPSIZE*MAPSIZE)
 			) {
 		    
-				map_color = map[256*iyp+ixp];
-				z         = map[256*iyp+ixp];
+				map_color = map[MAPSIZE*iyp+ixp];
+				z         = map[MAPSIZE*iyp+ixp];
 				if(z<MEERESSPIEGEL) z = MEERESSPIEGEL;
-				y = 100 + 30 * (flughoehe-z) / iy1;
+				y = HEIGHT/2 + 30 * (flughoehe-z) / iy1;
 
-				if ((y>=0) && (y<=199)) {
+				if ((y>=0) && (y<=HEIGHT-1)) {
 				for (j=x;j<=x+s;j++)
 				for (i=rng[j];i>=y;i--) {
-					if ((320*i+j>=0) && (320*i+j<320*200))
+					if ((WIDTH*i+j>=0) && (WIDTH*i+j<WIDTH*HEIGHT))
 					sdl_putpixel(screen, j, i, map_color);
 					if (y<rng[j]) rng[j] = y;
 				}}
@@ -111,7 +111,7 @@ void fly(SDL_Surface *screen) {
 	}
 
         if(SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);
-	SDL_UpdateRect(screen, 0, 0, 320, 200);
+	SDL_UpdateRect(screen, 0, 0, WIDTH, HEIGHT);
 
 	usleep(1000/25);
 }
diff --git a/sdl.c b/sdl.c
index ca94dc0..3a9a011 100644
--- a/sdl.c
+++ b/sdl.c
@@ -2,11 +2,12 @@
 
 #include <SDL.h>
 #include <stdlib.h>
+#include "sdl.h"
 
 SDL_Surface* sdl_init() {
 	SDL_Surface* screen;
 
-	screen = SDL_SetVideoMode(640, 480, 8, SDL_SWSURFACE);
+	screen = SDL_SetVideoMode(WIDTH, HEIGHT, 8, SDL_SWSURFACE);
 	if(screen == NULL) {
 		fprintf(stderr, "Unable to set video mode: %s\n", 
 			SDL_GetError());
diff --git a/sdl.h b/sdl.h
index ed3e06f..d4c05ab 100644
--- a/sdl.h
+++ b/sdl.h
@@ -1,4 +1,6 @@
 /* $Revision$ */
+#define WIDTH  640
+#define HEIGHT 480
 
 SDL_Surface* sdl_init();
 void sdl_putpixel(SDL_Surface *surface, int x, int y, Uint32 pixel);