int main()
{
int fbfd = 0;
struct fb_var_screeninfo vinfo;
struct fb_fix_screeninfo finfo;
long int screensize = 0;
char *fbp = 0;
int x = 0, y = 0;
long int location = 0;
#define background_red 235
#define background_green 138
#define background_blue 163
void makeBackground(){
for (y = 0; y < 236; y++)//maks 236
for (x = 0; x < 800; x++) {//maks 800
location = (x+vinfo.xoffset) * (vinfo.bits_per_pixel/8) +
(y+vinfo.yoffset) * finfo.line_length;
if (vinfo.bits_per_pixel == 32) { // color information
*(fbp + location) = background_blue; // blue
*(fbp + location + 1) = background_green; // green
*(fbp + location + 2) = background_red; // red
*(fbp + location + 3) = 0; // No transparency
} else {
printf("can't write\n");
}
}
}
void drawBlock(int absis, int ordinat, int red, int green, int blue){
for (y = ordinat; y < ordinat+10; y++)//maks 236
for (x = absis; x < ordinat+10; x++) {//maks 800
location = (x+vinfo.xoffset) * (vinfo.bits_per_pixel/8) +
(y+vinfo.yoffset) * finfo.line_length;
if (vinfo.bits_per_pixel == 32) { // color information
*(fbp + location) = blue; // blue
*(fbp + location + 1) = green; // green
*(fbp + location + 2) = red; // red
*(fbp + location + 3) = 0; // No transparency
} else {
printf("can't write\n");
}
}
}
void eraseBlock(int absis, int ordinat){
for (y = ordinat; y < ordinat+10; y++)//maks 236
for (x = absis; x < ordinat+10; x++) {//maks 800
location = (x+vinfo.xoffset) * (vinfo.bits_per_pixel/8) +
(y+vinfo.yoffset) * finfo.line_length;
if (vinfo.bits_per_pixel == 32) { // color information
*(fbp + location) = background_blue; // blue
*(fbp + location + 1) = background_green; // green
*(fbp + location + 2) = background_red; // red
*(fbp + location + 3) = 0; // No transparency
} else {
printf("can't write\n");
}
}
}
void fly(int red, int green, int blue){
for(int i = 0; i<10; i++){
drawBlock(10*i,10*i,red,green,blue);
printf("Heiho\n");
sleep(1000);
eraseBlock(10*i,10*i);
}
}
// Open the file for reading and writing
fbfd = open("/dev/fb0", O_RDWR);
if (fbfd == -1) {
perror("Error: cannot open framebuffer device");
exit(1);
}
printf("The framebuffer device was opened successfully.\n");
// Get fixed screen information
if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo) == -1) {
perror("Error reading fixed information");
exit(2);
}
// Get variable screen information
if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo) == -1) {
perror("Error reading variable information");
exit(3);
}
printf("%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel);
// Figure out the size of the screen in bytes
screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
printf("Screensize: %d", screensize);
// Map the device to memory
fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0);
if ((int)fbp == -1) {
perror("Error: failed to map framebuffer device to memory");
exit(4);
}
printf("The framebuffer device was mapped to memory successfully.\n");
makeBackground(0, 200, 255);
drawBlock(0, 0, 200, 100, 0);
fly(200,100,0);
munmap(fbp, screensize);
close(fbfd);
return 0;
}
Compass::Compass() :
m_prepared(false) {
makeArrows();
makeBackground();
}