Function generateSkyline

app/redis-6.2.6/src/lolwut6.c:123–160

Generate a skyline inspired by the parallax backgrounds of 8 bit games. */

/* Generate a skyline inspired by the parallax backgrounds of 8 bit games. */
void generateSkyline(lwCanvas *canvas) {
    struct skyscraper si;

    /* First draw the background skyscraper without windows, using the
     * two different grays. We use two passes to make sure that the lighter
     * ones are always in the background. */
    for (int color = 2; color >= 1; color--) {
        si.color = color;
        for (int offset = -10; offset < canvas->width;) {
            offset += rand() % 8;
            si.xoff = offset;
            si.width = 10 + rand()%9;
            if (color == 2)
                si.height = canvas->height/2 + rand()%canvas->height/2;
            else
                si.height = canvas->height/2 + rand()%canvas->height/3;
            si.windows = 0;
            generateSkyscraper(canvas, &si);
            if (color == 2)
                offset += si.width/2;
            else
                offset += si.width+1;
        }
    }

    /* Now draw the foreground skyscraper with the windows. */
    si.color = 0;
    for (int offset = -10; offset < canvas->width;) {
        offset += rand() % 8;
        si.xoff = offset;
        si.width = 5 + rand()%14;
        if (si.width % 4) si.width += (si.width % 3);
        si.height = canvas->height/3 + rand()%canvas->height/2;
        si.windows = 1;
        generateSkyscraper(canvas, &si);
        offset += si.width+5;
    }
}

/* The LOLWUT 6 command:
 *