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map drawing

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Dmitry V. Sokolov
2019-02-09 12:47:15 +01:00
parent 90b7cfb0f2
commit c6a12066bf
2 changed files with 43 additions and 0 deletions
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43
tinyraycaster.cpp
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@@ -29,11 +29,43 @@ void drop_ppm_image(const std::string filename, const std::vector<uint32_t> &ima
ofs.close();
}
void draw_rectangle(std::vector<uint32_t> &img, const size_t img_w, const size_t img_h, const size_t x, const size_t y, const size_t w, const size_t h, const uint32_t color) {
assert(img.size()==img_w*img_h);
for (size_t i=0; i<w; i++) {
for (size_t j=0; j<h; j++) {
size_t cx = x+i;
size_t cy = y+j;
assert(cx<img_w && cy<img_h);
img[cx + cy*img_w] = color;
}
}
}
int main() {
const size_t win_w = 512; // image width
const size_t win_h = 512; // image height
std::vector<uint32_t> framebuffer(win_w*win_h, 255); // the image itself, initialized to white
const size_t map_w = 16; // map width
const size_t map_h = 16; // map height
const char map[] = "0000222222220000"\
"1 0"\
"1 11111 0"\
"1 0 0"\
"0 0 1110000"\
"0 3 0"\
"0 10000 0"\
"0 0 11100 0"\
"0 0 0 0"\
"0 0 1 00000"\
"0 1 0"\
"2 1 0"\
"0 0 0"\
"0 0000000 0"\
"0 0"\
"0002222222200000"; // our game map
assert(sizeof(map) == map_w*map_h+1); // +1 for the null terminated string
for (size_t j = 0; j<win_h; j++) { // fill the screen with color gradients
for (size_t i = 0; i<win_w; i++) {
uint8_t r = 255*j/float(win_h); // varies between 0 and 255 as j sweeps the vertical
@@ -43,6 +75,17 @@ int main() {
}
}
const size_t rect_w = win_w/map_w;
const size_t rect_h = win_h/map_h;
for (size_t j=0; j<map_h; j++) { // draw the map
for (size_t i=0; i<map_w; i++) {
if (map[i+j*map_w]==' ') continue; // skip empty spaces
size_t rect_x = i*rect_w;
size_t rect_y = j*rect_h;
draw_rectangle(framebuffer, win_w, win_h, rect_x, rect_y, rect_w, rect_h, pack_color(0, 255, 255));
}
}
drop_ppm_image("./out.ppm", framebuffer, win_w, win_h);
return 0;