Diffstat (limited to 'noncore/games/sfcave-sdl/starfield.cpp') (more/less context) (ignore whitespace changes)
| -rw-r--r-- | noncore/games/sfcave-sdl/starfield.cpp | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/noncore/games/sfcave-sdl/starfield.cpp b/noncore/games/sfcave-sdl/starfield.cpp new file mode 100644 index 0000000..c1f2d73 --- a/dev/null +++ b/noncore/games/sfcave-sdl/starfield.cpp @@ -0,0 +1,223 @@ +#include "SDL.h"
+#include "SDL_gfxPrimitives.h"
+
+#include <stdlib.h>
+
+#include "starfield.h"
+#include "random.h"
+#include "util.h"
+
+#define VERTICAL_VELOCITY 0
+
+StarField :: StarField( bool side, int nStars, int mx, int my, int minz, int maxz )
+{
+ nrStars = nStars;
+ maxX = mx;
+ maxY = my;
+ minZ = minz;
+ maxZ = maxz;
+
+ min_brightness = 50;
+ top_star_speed = 6;
+
+ sideways = side;
+
+ if ( !sideways )
+ {
+ x = new int[nrStars];
+ y = new int[nrStars];
+ z = new int[nrStars];
+
+ star_color = 0;
+ vel_x = 0;
+ vel_y = 0;
+ pos_x = 0;
+ pos_y = 0;
+ }
+ else
+ {
+ star_color = new int[nrStars];
+ vel_x = new int[nrStars];
+ vel_y = new int[nrStars];
+ pos_x = new int[nrStars];
+ pos_y = new int[nrStars];
+
+ x = 0;
+ y = 0;
+ z = 0;
+ }
+
+ init();
+}
+
+StarField :: ~StarField()
+{
+ if ( star_color )
+ delete []star_color;
+ if ( vel_x )
+ delete []vel_x;
+ if ( vel_y )
+ delete []vel_y;
+ if ( pos_x )
+ delete []pos_x;
+ if ( pos_y )
+ delete []pos_y;
+
+ if ( x )
+ delete []x;
+ if ( y )
+ delete []y;
+ if ( z )
+ delete []z;
+}
+
+void StarField :: init()
+{
+ if ( !sideways )
+ {
+ for ( int i = 0 ; i < nrStars ; ++i )
+ {
+ newStar( i );
+ z[i] = (int)(Random() * (double)(maxZ - minZ)) + minZ ;
+ }
+ }
+ else
+ {
+ int brightness;
+
+ //Initialise each star
+ for(int i = 0; i < nrStars ; i++)
+ {
+ //Inialise velocities
+ vel_x[i] = -(int)floor( (Random() * top_star_speed)+1 );
+ vel_y[i] = VERTICAL_VELOCITY;
+
+ //Initialise positions randomly
+ pos_x[i] = (int)floor((Random() * 240));
+ pos_y[i] = (int)floor((Random() * 320));
+
+ //The Faster it goes, the Dimmer it is
+ if (vel_x[i] != 0)
+ {
+ brightness = (int)(255 / fabs(vel_x[i]) );
+ if (brightness < min_brightness)
+ brightness = min_brightness;
+ }
+ else
+ brightness = 255;
+
+ star_color[i] = brightness;
+ }
+ }
+}
+
+void StarField :: newStar( int starNr )
+{
+ if ( !sideways )
+ {
+ x[starNr] = (int)(Random() * (double)maxX) + 1;
+ y[starNr] = (int)(Random() * (double)maxY) + 1;
+ z[starNr] = maxZ;
+
+ int i = (int)(Random() * 4.0);
+ if(i < 2)
+ x[starNr] = -x[starNr];
+ if(i == 0 || i == 2)
+ y[starNr] = -y[starNr];
+ }
+}
+
+void StarField :: move( )
+{
+ if ( !sideways )
+ {
+ int amountToMove = 16;
+ for(int i = 0; i < nrStars; i++)
+ {
+ // Rotate star
+ z[i] = z[i] - amountToMove;
+ if(z[i] < minZ)
+ newStar(i);
+ }
+ }
+ else
+ {
+ for(int i = 0; i < nrStars ; i++)
+ {
+ //Check speed limits x
+ if (vel_x[i] > top_star_speed)
+ vel_x[i] = top_star_speed;
+ else if (vel_x[i] < -top_star_speed)
+ vel_x[i] = -top_star_speed;
+
+ //Check speed limits y
+ if (vel_y[i] > top_star_speed)
+ vel_y[i] = top_star_speed;
+ else if (vel_y[i] < -top_star_speed)
+ vel_y[i] = -top_star_speed;
+
+
+
+ //Move Star
+ pos_x[i] += vel_x[i];
+ pos_y[i] += vel_y[i];
+
+ if (pos_x[i] < 0)
+ pos_x[i] = pos_x[i] + 240;
+
+ if (pos_x[i] > 240)
+ pos_x[i] = pos_x[i] - 240;
+ if (pos_y[i] < 0)
+ pos_y[i] = pos_y[i] + 320;
+
+ if (pos_y[i] > 320)
+ pos_y[i] = pos_y[i] - 320;
+ }
+ }
+}
+
+void StarField :: draw( SDL_Surface *screen, int w, int h )
+{
+ if ( !sideways )
+ {
+ int scrW = w / 2;
+ int scrH = h / 2;
+ for(int i = 0; i < nrStars; i++)
+ {
+ int sx = (x[i] * 256) / z[i] + scrW;
+ int sy = (y[i] * 256) / z[i] + scrH;
+ if(sx < 0 || sx > w || sy < 0 || sy > h)
+ {
+ newStar(i);
+ }
+ else
+ {
+ int size = (z[i] * 3) / maxZ;
+
+ SDL_Rect r;
+ r.x = sx;
+ r.y = sy;
+ r.w = 3 - size;
+ r.h = 3 - size;
+
+ SDL_FillRect( screen, &r, SDL_MapRGB( screen->format, 255, 255, 255 ) );
+ }
+ }
+ }
+ else
+ {
+ SDL_LockSurface( screen );
+ for(int i = 0; i < nrStars ; i++)
+ {
+
+ Uint32 c = getpixel( screen, pos_x[i], pos_y[i] );
+
+
+ if ( c == 0 )
+ lineRGBA( screen, pos_x[i], pos_y[i], pos_x [i]+ vel_x[i], pos_y[i] + vel_y[i], star_color[i], star_color[i], star_color[i], 255 );
+
+ //*** NOTE : if the velocity of the stars never changes then the values such as 'pos_x[i] + vel_x[i]' could be precalculated for each star ***
+ }
+ SDL_UnlockSurface( screen );
+ }
+}
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