public void DrawCircle(int xc, int yc, int r, PIXEL_TYPE pixel = PIXEL_TYPE.PIXEL_SOLID, COLOR col = COLOR.FG_WHITE)
{
int x = 0;
int y = r;
int p = 3 - 2 * r;
if (r == 0)
{
return;
}
while (y >= x) // only formulate 1/8 of circle
{
Draw(xc - x, yc - y, pixel, col); //upper left left
Draw(xc - y, yc - x, pixel, col); //upper upper left
Draw(xc + y, yc - x, pixel, col); //upper upper right
Draw(xc + x, yc - y, pixel, col); //upper right right
Draw(xc - x, yc + y, pixel, col); //lower left left
Draw(xc - y, yc + x, pixel, col); //lower lower left
Draw(xc + y, yc + x, pixel, col); //lower lower right
Draw(xc + x, yc + y, pixel, col); //lower right right
if (p < 0)
{
p += 4 * x++ + 6;
}
else
{
p += 4 * (x++ - y--) + 10;
}
}
}
public virtual void Draw(int x, int y, PIXEL_TYPE pixel = PIXEL_TYPE.PIXEL_SOLID, COLOR col = COLOR.FG_WHITE)
{
if (x >= 0 && x < m_nScreenWidth && y >= 0 && y < m_nScreenHeight)
{
m_bufScreen[y * m_nScreenWidth + x].UnicodeChar = (char)pixel;
m_bufScreen[y * m_nScreenWidth + x].Attributes = (ushort)col;
}
}
public void Fill(int x1, int y1, int x2, int y2, PIXEL_TYPE pixel = PIXEL_TYPE.PIXEL_SOLID, COLOR col = COLOR.FG_WHITE)
{
Clip(x1, y1);
Clip(x2, y2);
for (int x = x1; x < x2; x++)
{
for (int y = y1; y < y2; y++)
{
Draw(x, y, pixel, col);
}
}
}
public void DrawToBuffer(PIXEL_TYPE val, int x, int y)
{
int index = y * bufferWidth + x;
if (index >= buffer.Length || index < 0)
{
return;
}
buffer[index].character = (char)val;
bufferChanged = true;
}
public void DrawTriangle(int x1, int y1, int x2, int y2, int x3, int y3, PIXEL_TYPE pixel = PIXEL_TYPE.PIXEL_SOLID, COLOR col = COLOR.FG_WHITE)
{
DrawLine(x1, y1, x2, y2, pixel, col);
DrawLine(x2, y2, x3, y3, pixel, col);
DrawLine(x3, y3, x1, y1, pixel, col);
}
public void DrawLine(int x1, int y1, int x2, int y2, PIXEL_TYPE pixel = PIXEL_TYPE.PIXEL_SOLID, COLOR col = COLOR.FG_WHITE)
{
int x, y, dx, dy, dx1, dy1, px, py, xe, ye, i;
dx = x2 - x1;
dy = y2 - y1;
dx1 = Math.Abs(dx);
dy1 = Math.Abs(dy);
px = 2 * dy1 - dx1;
py = 2 * dx1 - dy1;
if (dy1 <= dx1)
{
if (dx >= 0)
{
x = x1;
y = y1;
xe = x2;
}
else
{
x = x2;
y = y2;
xe = x1;
}
Draw(x, y, pixel, col);
for (i = 0; x < xe; i++)
{
x = x + 1;
if (px < 0)
{
px = px + 2 * dy1;
}
else
{
if ((dx < 0 && dy < 0) || (dx > 0 && dy > 0))
{
y = y + 1;
}
else
{
y = y - 1;
}
px = px + 2 * (dy1 - dx1);
}
Draw(x, y, pixel, col);
}
}
else
{
if (dy >= 0)
{
x = x1;
y = y1;
ye = y2;
}
else
{
x = x2;
y = y2;
ye = y1;
}
Draw(x, y, pixel, col);
for (i = 0; y < ye; i++)
{
y = y + 1;
if (py <= 0)
{
py = py + 2 * dx1;
}
else
{
if ((dx < 0 && dy < 0) || (dx > 0 && dy > 0))
{
x = x + 1;
}
else
{
x = x - 1;
}
py = py + 2 * (dx1 - dy1);
}
Draw(x, y, pixel, col);
}
}
}
