public static Polygon2f FromLine(Line2f line, float width)
{
if (!line.HasNormals)
{
throw new ArgumentException("Line must have normals to create a polygon from.");
}
if (line.VerticesCount < 2)
{
throw new ArgumentException("Line must have at least to positions to create a polygon from.");
}
int count = line.VerticesCount;
float half = width * 0.5f;
Polygon2f polygon = new Polygon2f(count * 2);
for (int i = 0; i < count; i++)
{
polygon.Positions[i] = line.Positions[i] + line.Normals[i] * half;
}
for (int i = 0; i < count; i++)
{
int j = count - i - 1;
polygon.Positions[i + count] = line.Positions[j] - line.Normals[j] * half;
}
return(polygon);
}
public void printLineCut(Line2f lineCoords, Vec3f color)
{
int stride = (pixelWidth * 32) / 8;
int pixelHeight = buf.Length / stride;
Line2f line = clip.Clip(lineCoords);
if (line == null)
{
return;
}
int x0 = (int)line.x0;
int y0 = (int)line.y0;
int x1 = (int)line.x1;
int y1 = (int)line.y1;
int dx = Math.Abs(x1 - x0);
int sx = x0 < x1 ? 1 : -1;
int dy = Math.Abs(y1 - y0);
int sy = y0 < y1 ? 1 : -1;
int err = (dx > dy ? dx : -dy) / 2;
int e2;
for (; ;)
{
printPixel(x0, y0, color);
if (x0 == x1 && y0 == y1)
{
break;
}
e2 = err;
if (e2 > -dx)
{
err -= dy;
x0 += sx;
}
if (e2 < dy)
{
err += dx;
y0 += sy;
}
}
}
