internal Cursor(VgaScreen vgaScreen)
{
_x = 0;
_y = 0;
VgaScreen = vgaScreen;
}
public static void Scroll(this VgaScreen screen)
{
for (var y = screen.Margins.Top + 1; y < screen.TotalRows - screen.Margins.Bottom; y++)
{
for (var x = screen.Margins.Left; x < screen.TotalColumns - screen.Margins.Right; x++)
{
screen[x, y - 1].Character = screen[x, y].Character;
screen[x, y - 1].Foreground = screen[x, y].Foreground;
screen[x, y - 1].Background = screen[x, y].Background;
screen[x, y - 1].Blink = screen[x, y].Blink;
}
}
for (var x = screen.Margins.Left; x < screen.TotalColumns - screen.Margins.Right; x++)
{
var lastLineCoord = screen.TotalRows - screen.Margins.Bottom - 1;
screen[x, lastLineCoord].Character = ' ';
screen[x, lastLineCoord].Foreground = VgaScreen.DefaultForegroundColor;
screen[x, lastLineCoord].Background = VgaScreen.DefaultBackgroundColor;
screen[x, lastLineCoord].Blink = false;
}
}
public static void PutCharAt(this VgaScreen screen,
int x, int y, char character)
{
screen[x, y].Character = character;
}
public static void SetColorAt(this VgaScreen screen,
int x, int y, Color foreground, Color background)
{
screen[x, y].Foreground = foreground;
screen[x, y].Background = background;
}
public static void PutCharAt(this VgaScreen screen,
int x, int y, char character, Color foreground, Color background, bool blink)
{
screen.SetColorAt(x, y, foreground, background);
screen.PutCharAt(x, y, character, blink);
}
public static void PutCharAt(this VgaScreen screen,
int x, int y, char character, bool blink)
{
screen[x, y].Character = character;
screen[x, y].Blink = blink;
}