- works now
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a9253c089a
commit
98fae707ee
3 changed files with 95 additions and 78 deletions
169
cscape.c
169
cscape.c
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@ -9,6 +9,7 @@
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#define MEERESSPIEGEL 48
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#define BLICKWEITE 55
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#define FLUGHOEHE 30
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#define MAPSIZE 256
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int sintab[360];
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@ -27,6 +28,94 @@ void init_tabs() {
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costab[x] = -sintab[x-90];
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}
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void fly(SDL_Surface *screen) {
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static int
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posx = 0,
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posy = 0,
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richtung = 0,
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flughoehe = 0;
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int iy, ix, iy1, iyp, ixp;
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int x, y, z, s, i, j;
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int map_color;
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int rng[320];
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if(SDL_MUSTLOCK(screen))
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if(SDL_LockSurface(screen) < 0) {
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fprintf(stderr, "Can't lock screen: %s\n",
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SDL_GetError());
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return;
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}
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/* Richtung wechseln? */
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/* if (java.lang.Math.random()<0.5)
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if (java.lang.Math.random()<1.0)
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if (richtung <= 0) richtung = 357;
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else richtung -= 3;
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else
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if (richtung >= 357) richtung = 0;
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else richtung += 3;
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*/
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/* Bewegen ... */
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posy = posy + costab[richtung] / 32;
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posx = posx + sintab[richtung] / 32;
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posy %= MAPSIZE;
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posx %= MAPSIZE;
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/* Absolute Höhe berechnen */
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flughoehe = 100;
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/* flughoehe = FLUGHOEHE + ... */
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/* FIXME */
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for (i=0;i<320;i++) rng[i] = 200;
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SDL_FillRect(screen, NULL, 0);
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for (iy=posy; iy<=posy+BLICKWEITE; iy++) {
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iy1 = 2 * (iy-posy) + 1;
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s = 4 + 300 / iy1;
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for (ix=posx-(iy-posy); ix<=posx+(iy-posy); ix++) {
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ixp = posx
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+ ((ix-posx) * costab[richtung]
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+ (iy-posy) * sintab[richtung]) / 128;
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iyp = posy
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+ ((iy-posy) * costab[richtung]
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- (ix-posx) * sintab[richtung]) / 128;
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x = 160 + 360*(ix-posx) / iy1;
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if(
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(x>=0) && (x+s<=318)
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&& ((256*iyp+ixp) > 0)
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&& ((256*iyp+ixp) < 256*256)
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) {
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map_color = map[256*iyp+ixp];
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z = map[256*iyp+ixp];
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if(z<MEERESSPIEGEL) z = MEERESSPIEGEL;
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y = 100 + 30 * (flughoehe-z) / iy1;
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if ((y>=0) && (y<=199)) {
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for (j=x;j<=x+s;j++)
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for (i=rng[j];i>=y;i--) {
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if ((320*i+j>=0) && (320*i+j<320*200))
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sdl_putpixel(screen, j, i, map_color);
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if (y<rng[j]) rng[j] = y;
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}}
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}
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}
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}
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if(SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);
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SDL_UpdateRect(screen, 0, 0, 320, 200);
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usleep(1000/25);
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}
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int main(void) {
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init_tabs();
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map_init(map,MAPSIZE,MAPSIZE);
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@ -35,83 +124,11 @@ int main(void) {
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screen = sdl_init();
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map_setpalette(screen);
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while(1) {
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fly(screen);
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}
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sleep(30); SDL_Quit(); exit(0);
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}
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/*
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int posx = 0;
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int posy = 0;
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int richtung = 0;
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int flughoehe;
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int iy, ix, iy1, iyp, ixp;
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int x, y, z, s, i, j;
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int map_color;
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int rng[] = new int[320];
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while (true) {
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// Schnarch...
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try {Thread.sleep(100);} catch (InterruptedException e) {}
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Richtung wechseln?
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if (java.lang.Math.random()<0.5)
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if (java.lang.Math.random()<1.0)
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if (richtung <= 0) richtung = 357;
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else richtung -= 3;
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else
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if (richtung >= 357) richtung = 0;
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else richtung += 3;
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Vorwärts?
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posy = posy + costab[richtung] / 32;
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posx = posx + sintab[richtung] / 32;
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if (posy<=0) posy += 256;
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if (posx<=0) posx += 256;
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Absolute Höhe berechnen
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flughoehe = 100;
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for (i=0;i<320;i++) rng[i] = 200;
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System.arraycopy(emptyscreen,0,screen,0,320*200);
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for (iy=posy; iy<=posy+blickweite; iy++) {
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iy1 = 2 * (iy-posy) + 1;
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s = 4 + 300 / iy1;
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for (ix=posx-(iy-posy); ix<=posx+(iy-posy); ix++) {
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ixp = posx + ((ix-posx) * costab[richtung] + (iy-posy) * sintab[richtung])
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/ 128;
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iyp = posy + ((iy-posy) * costab[richtung] - (ix-posx) * sintab[ri
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chtung]) / 128;
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x = 160 + 360*(ix-posx) / iy1;
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if ((x>=0) && (x+s<=318) && ((256*iyp+ixp) > 0) && ((256*iyp+ixp)
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< 256*256) ) {
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map_color = map[256*iyp+ixp];
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z = map[256*iyp+ixp];
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if (z < meeresspiegel) z = meeresspiegel;
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y = 100 + 30 * (flughoehe-z) / iy1;
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if ((y>=0) && (y<=199)) {
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for (j=x;j<=x+s;j++)
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for (i=rng[j];i>=y;i--) {
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if ((320*i+j>=0) && (320*i+j<320*200))
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screen[320*i+j] = (byte)map_color;
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if (y<rng[j]) rng[j] = y;
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}
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*/
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@ -26,7 +26,7 @@ void map_show(SDL_Surface *screen, char *map, int mapsize) {
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if(SDL_MUSTLOCK(screen))
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SDL_UnlockSurface(screen);
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SDL_UpdateRect(screen, 0, 0, mapsize-1, mapsize-1);
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SDL_UpdateRect(screen, 0, 0, mapsize, mapsize);
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}
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int main(void) {
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2
sdl.c
2
sdl.c
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@ -4,7 +4,7 @@
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#include <stdlib.h>
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SDL_Surface* sdl_init() {
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SDL_Surface *screen;
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SDL_Surface* screen;
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screen = SDL_SetVideoMode(640, 480, 8, SDL_SWSURFACE);
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if(screen == NULL) {
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