private void Clear()
{
Clear(Pixel.defaultColor());
}
public void drawLine(int x1, int y1, int x2, int y2, Pixel p)
{
/*
* source:
* https://github.com/OneLoneCoder/videos/blob/master/olcConsoleGameEngine.h
*/
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, p);
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, p);
}
}
else
{
if (dy >= 0)
{
x = x1; y = y1; ye = y2;
}
else
{
x = x2; y = y2; ye = y1;
}
draw(x, y, p);
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, p);
}
}
}
public void drawTriangle(int x1, int y1, int x2, int y2, int x3, int y3, Pixel p)
{
drawLine(x1, y1, x2, y2, p);
drawLine(x2, y2, x3, y3, p);
drawLine(x3, y3, x1, y1, p);
}
public void drawString(int x, int y, string s)
{
drawString(x, y, s, Pixel.defaultColor());
}