static Bitmap CoverPolygon(Bitmap original, Bitmap bmp, Point[] polygon, FilterInfo info)
{
int width = original.Size.Width;
int height = original.Size.Height;
PointF center = new Point();
Point lowerBounds = new Point();
Point upperBounds = new Point();
for (int i = 0; i < polygon.Length; ++i)
{
center.X += polygon[i].X;
center.Y += polygon[i].Y;
lowerBounds.X = Math.Min(lowerBounds.X, polygon[i].X);
lowerBounds.Y = Math.Min(lowerBounds.Y, polygon[i].Y);
upperBounds.X = Math.Max(upperBounds.X, polygon[i].X);
upperBounds.Y = Math.Max(upperBounds.Y, polygon[i].Y);
}
center.X /= polygon.Length;
center.Y /= polygon.Length;
int[] minX = new int[height];
int[] maxX = new int[height];
for (int y = lowerBounds.Y; y <= upperBounds.Y; ++y)
{
Line2D row = new Line2D(0, 1, -y);
minX[y] = width;
maxX[y] = 0;
for (int i = 0; i < polygon.Length; ++i)
{
Segment2D seg = new Segment2D(polygon[i], polygon[(i + 1) % polygon.Length]);
Tuple <bool, PointF> res = seg.Intersect(row);
if (res.Item1 == true)
{
//if (res.Item2.X <= center.X)
minX[y] = (int)Math.Min(minX[y], res.Item2.X);
//if (res.Item2.X >= center.X)
maxX[y] = (int)Math.Max(maxX[y], res.Item2.X);
}
}
}
// THIS HAS TO GO SOMEWHERE ELSE
//Graphics g = Graphics.FromImage(bmp);
//g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
if (info.type == FilterInfo.FilterType.solidColor)
{
//SolidBrush brush = new SolidBrush(info.color);
//g.FillPolygon(brush, polygon);
Fill(bmp, info.color, lowerBounds.Y, upperBounds.Y, minX, maxX);
}
else if (info.type == FilterInfo.FilterType.mean)
{
Color color = GetMean(original, lowerBounds.Y, upperBounds.Y, minX, maxX);
//SolidBrush brush = new SolidBrush(color);
//g.FillPolygon(brush, polygon);
Fill(bmp, color, lowerBounds.Y, upperBounds.Y, minX, maxX);
}
return(bmp);
}
public bool IsParalel(Line2D arg)
{
return(Math.Abs((-a / b) - (-arg.a / arg.b)) < EPS);
}
