// draw vertical line
public static void DrawLineY(int x, int y, int h, VGAColor color)
{
for (int i = 0; i < h; i++)
{
DrawPixel(x, y + i, color);
}
}
// draw point-to-point line
public static void DrawLine(int x0, int y0, int x1, int y1, VGAColor color)
{
// calculate
int xx = x0, yy = y0;
var dx = Math.Abs(x1 - x0);
var dy = Math.Abs(y1 - y0);
var sx = (x0 < x1) ? 1 : -1;
var sy = (y0 < y1) ? 1 : -1;
var err = dx - dy;
while (true)
{
// draw pixel
DrawPixel(xx, yy, color);
// increment
if ((x0 == x1) && (y0 == y1))
{
break;
}
var e2 = 2 * err;
if (e2 > -dy)
{
err -= dy; xx += (int)sx;
}
if (e2 < dx)
{
err += dx; yy += (int)sy;
}
}
}
// draw string with background color
public static void DrawString(int x, int y, string text, VGAColor fg, VGAColor bg, VGAFont font)
{
// determine font size
fontHeight = 8;
if (font == VGAFont.Font8x8)
{
fontHeight = 8;
}
else if (font == VGAFont.Font8x16)
{
fontHeight = 16;
}
int xx = x, yy = y;
for (int i = 0; i < text.Length; i++)
{
// new line
if (text[i] == '\n')
{
xx = x; yy += fontHeight;
}
// character
else
{
DrawChar(xx, yy, text[i], fg, bg, font); xx += 8;
}
}
}
// draw horizontal line
public static void DrawLineX(int x, int y, int w, VGAColor color)
{
for (int i = 0; i < w; i++)
{
DrawPixel(x + i, y, color);
}
}
// draw filled rectangle
public static void DrawFilledRect(int x, int y, int w, int h, VGAColor color)
{
for (int i = 0; i < h; i++)
{
for (int j = 0; j < w; j++)
{
DrawPixel(x + j, y + i, color);
}
}
}
// draw custom image format with transparency key
public static void DrawImage(int x, int y, VGAColor transKey, VGAImage image)
{
for (int yy = 0; yy < image.Height; yy++)
{
for (int xx = 0; xx < image.Width; xx++)
{
if (image.Data[xx + (yy * image.Width)] != (byte)transKey)
{
DrawPixel(x + xx, y + yy, (VGAColor)image.Data[xx + (yy * image.Width)]);
}
}
}
}
// draw character with background color
public static void DrawChar(int x, int y, char c, VGAColor fg, VGAColor bg, VGAFont font)
{
// determine font size
fontHeight = 8;
if (font == VGAFont.Font8x8)
{
fontHeight = 8;
}
else if (font == VGAFont.Font8x16)
{
fontHeight = 16;
}
int p = fontHeight * (byte)c;
// vertical
for (int cy = 0; cy < fontHeight; cy++)
{
// horizontal
for (byte cx = 0; cx < 8; cx++)
{
// 8x8
if (font == VGAFont.Font8x8)
{
// convert to position and draw
if (VGAFontData.ConvertByteToBitAddress(VGAFontData.Font8x8_Data[p + cy], cx + 1))
{
DrawPixel(x + (8 - cx), y + cy, fg);
}
else
{
DrawPixel(x + (8 - cx), y + cy, bg);
}
}
// 8x16
else if (font == VGAFont.Font8x16)
{
// convert to position and draw
if (VGAFontData.ConvertByteToBitAddress(VGAFontData.Font8x16_Data[p + cy], cx + 1))
{
DrawPixel(x + (8 - cx), y + cy, fg);
}
else
{
DrawPixel(x + (8 - cx), y + cy, bg);
}
}
}
}
}
public Window(int x, int y, VGAColor bg)
{
(X, Y, BackColor) = (x, y, bg);
}
// convert colors to attribute
public static byte ToAttribute(VGAColor fg, VGAColor bg)
{
return((byte)((byte)fg | (byte)bg << 4));
}
// draw pixel
public static void DrawPixel(int x, int y, VGAColor color)
{
vga.DrawPixel((ushort)x, (ushort)y, (byte)color);
}
// clear the screen
public static void Clear(VGAColor color)
{
vga.Clear((byte)color);
}
