int main(int argc, char **argv) {
int result,i;
int i2c_fd;
i2c_fd=init_i2c("/dev/i2c-1");
if (i2c_fd < 0) {
fprintf(stderr,"Error opening device!\n");
return -1;
}
/* Init display */
if (init_display(i2c_fd,HT16K33_ADDRESS0,10)) {
fprintf(stderr,"Error opening display\n");
return -1;
}
result=load_font("tbfont.tb1");
while(1) {
for(i=32;i<127;i++) {
result=put_letter(i,i2c_fd);
usleep(500000);
}
}
return result;
}
static void draw_date(struct tm* t, GContext* ctx) {
static char txt[] = "XXX 00XXX";
strftime(txt, sizeof(txt), "%a %e%b", t);
int width = 0, x;
const Character *ch;
char* c = txt;
while (*c != '\0') {
if (*c >= 'A' && *c <= 'Z') {
ch = LETTER_TABLE[*c - 65];
} else if (*c >= 'a' && *c <= 'z') {
ch = LETTER_TABLE[*c - 97];
} else if (*c >= '0' && *c <= '9') {
ch = NUMBER_TABLE[*c - 48];
} else if (*c == ' ') {
width += WEEK_DATE_SPACING;
c++;
continue;
} else {
continue;
}
width += ch->width + DATE_CHAR_SPACING;
c++;
}
x = (SCREEN_WIDTH - width + DATE_CHAR_SPACING) / 2;
c = txt;
while (*c != '\0') {
if (*c >= 'A' && *c <= 'Z') {
ch = LETTER_TABLE[*c - 65];
} else if (*c >= 'a' && *c <= 'z') {
ch = LETTER_TABLE[*c - 97];
} else if (*c >= '0' && *c <= '9') {
ch = NUMBER_TABLE[*c - 48];
} else if (*c == ' ') {
x += WEEK_DATE_SPACING;
c++;
continue;
} else {
continue;
}
put_letter(ch, ctx, x, DATE_TOP_MARGIN);
x += ch->width + DATE_CHAR_SPACING;
c++;
}
}
void render_screen(int fd, std::string str)
{
// Clear the screen
memset(frontstore, 0, sizeof(frontstore));
auto render_string = [](std::string str, int start_line)
{
// The start line, and start x coordinate
int line = start_line;
int char_x = 1;
// Run the entire string, char by char
for(char& c : str)
{
// Find the pixel letter corresponding to the char
Letter l = find_letter(c);
// If we overflow this line, by adding it, do a line break
if(char_x + l.letter_width >= YSIZE)
{
char_x = 1;
line++;
// If we overflow the screen, skip the rest of the string
if(line > 2)
{
break;
}
}
// Calculate our y coord, based upon the line, we're in
int char_y = 0 + line * (LETTER_HEIGHT + 1);
// Do the actual printing of the character
put_letter(char_y, char_x, l);
// Move the size of this letter, and 1 character,
// before rendering the next character
char_x += l.letter_width;
char_x += 1;
}
// People who start on the line after us
return line+1;
};
// Write the new string
int end_line = render_string(str, 0);
// If the new string did not take up all the space,
// lets reload some of the old stuff, and draw that
for(std::string old : old_lines)
{
// Only draw, if we're inside the screen
if(end_line > 2)
{
break;
}
end_line = render_string(old, end_line);
}
// The string we just rendered, is now an old line
old_lines.push_front(str);
// Garbage collect old_lines
while(old_lines.size() > 3)
{
old_lines.pop_back();
}
// Render!
scr_frontmap(fd);
}
