int vg_draw_circle(unsigned long x0, unsigned long y0, unsigned long radius, unsigned long color)
{
// Midpoint circle algorithm
int x = radius;
int y = 0;
int error = 1 - x;
while (x >= y)
{
vg_draw_line(-x + x0, y + y0, x + x0, y + y0, color);
vg_draw_line(-y + x0, x + y0, y + x0, x + y0, color);
vg_draw_line(-x + x0, -y + y0, x + x0, -y + y0, color);
vg_draw_line(-y + x0, -x + y0, y + x0, -x + y0, color);
y++;
if (error < 0)
{
error += 2 * y + 1;
}
else
{
x--;
error += 2 * (y - x + 1);
}
}
return 0;
}
int test_line(unsigned short xi, unsigned short yi, unsigned short xf,
unsigned short yf, unsigned long color) {
if (vg_init(VBE_VIDEO_MODE) == NULL)
return 1;
if(xi > xf && yi > yf){
unsigned short tmp = xf;
xf = xi;
xi = tmp;
tmp = yf;
yf = yi;
yi = tmp;
}
if (vg_draw_line(xi, yi, xf, yf, color) != 0) {
vg_exit();
return 1;
}
vg_update_screen();
kbd_test_scan(0);
return vg_exit();
}
long vg_get_pixel(unsigned long x, unsigned long y) {
char *write_address = video_mem;
if((x < 0) || (x > h_res) || (y < 0) || (y > v_res)){
vg_draw_line(1,1,200,200,0xF4C3);
return 1;
}
write_address += (bits_per_pixel/8)*((y-1)*h_res+x);
return (long)*write_address;
}
int vg_draw_square(unsigned int xi, unsigned int yi, unsigned int xf, unsigned int yf, unsigned int color)
{
vg_draw_line(xi,yi, xf, yi, color);
vg_draw_line(xi,yi, xi, yf, color);
vg_draw_line(xi,yf, xf, yf, color);
vg_draw_line(xf,yf, xf, yi, color);
int i;
int j;
int xi2 = xi, yi2 = yi;
for (i = 0; i < (yf-yi); i++)
{
for (j = 0; j < (xf-xi); j++)
{
vg_set_pixel(xi2,yi2, color);
xi2++;
}
yi2++;
xi2 = xi;
}
}
int test_line(unsigned short xi, unsigned short yi,
unsigned short xf, unsigned short yf, unsigned long color) {
vg_init(GRAPHIC_MODE);
int ipc_status;
message msg;
int request;
int irq_set;
irq_set = subscribe_kbd();
while (scanCode != EXIT_MAKE_CODE) {
request = driver_receive(ANY, &msg, &ipc_status);
if (request != 0) {
printf("driver_receive failed with: %d", request);
continue;
}
if (is_ipc_notify(ipc_status)) {
switch (_ENDPOINT_P(msg.m_source)) {
case HARDWARE:
if (msg.NOTIFY_ARG & irq_set) {
kbd_handler();
}
vg_draw_line(xi,xf,yi,yf,color);
break;
default:
break;
}
}
else {
}
}
unsubscribe_kbd();
vg_exit();
return 0;
}
