void Display :: _line(SDL_Surface* surf,
int x0, int y0, int x1, int y1,
Uint32 color)
{
x0 = std::max(x0, 0); x0 = std::min(x0, surf->w - 1);
x1 = std::max(x1, 0); x1 = std::min(x1, surf->w - 1);
y0 = std::max(y0, 0); y0 = std::min(y0, surf->h - 1);
y1 = std::max(y1, 0); y1 = std::min(y1, surf->h - 1);
int dy = y1 - y0;
int dx = x1 - x0;
int stepx, stepy;
if (dy < 0) { dy = -dy; stepy = -1; } else { stepy = 1; }
if (dx < 0) { dx = -dx; stepx = -1; } else { stepx = 1; }
dy <<= 1; // dy is now 2*dy
dx <<= 1; // dx is now 2*dx
_put_pixel(surf, color, x0, y0);
if (dx > dy)
{
int fraction = dy - (dx >> 1); // same as 2*dy - dx
while (x0 != x1)
{
if (fraction >= 0)
{
y0 += stepy;
fraction -= dx; // -= 2*dx
}
x0 += stepx;
fraction += dy; // -= 2*dy
_put_pixel(surf, color, x0, y0);
}
}
void Display :: _blit_map() {
for (unsigned i = 0; i < _map->get_pixel_w(); ++i)
for (unsigned j = 0; j < _map->get_pixel_h(); ++j)
if (_map->get_pixel(i, j) == Map::obstacle)
_put_pixel(_map_bmp, i, j, 0, 0, 0);
else
_put_pixel(_map_bmp, i, j, 255, 255, 255);
SDL_BlitSurface(_map_bmp, 0, _screen, 0);
SDL_UpdateRect(_screen, 0, 0, _w, _h);
}
void put_pixel(int x, int y, int color) {
int i,j;
for(i=0; i<FACTEUR; i++) {
for(j=0; j<FACTEUR; j++) {
_put_pixel(color,x*FACTEUR+i,y*FACTEUR+j,buffer);
}
}
}
void _put_pixel(SDL_Surface* surf,
unsigned x, unsigned y,
Uint8 r, Uint8 g, Uint8 b) {
_put_pixel(surf, SDL_MapRGB(surf->format, r, g, b), x, y);
}
void _put_pixel(SDL_Surface* surf,
int x, int y,
Uint8 r, Uint8 g, Uint8 b)
{ _put_pixel(surf, SDL_MapRGB(surf->format, r, g, b), x, y); }
