/// <summary>
/// Combines transformations to create single transformation matrix
/// </summary>
private static double[,] CreateTransformationMatrix
(IImageTransformation[] vectorTransformations, int dimensions)
{
double[,] vectorTransMatrix =
Matrices.CreateIdentityMatrix(dimensions);
// combining transformations works by multiplying them
foreach (var trans in vectorTransformations)
{
vectorTransMatrix =
Matrices.Multiply(vectorTransMatrix, trans.CreateTransformationMatrix());
}
return(vectorTransMatrix);
}
/// <summary>
/// Applies image transformations bitmap object
/// </summary>
public static Bitmap Apply(Bitmap bmp, IEnumerable <IImageTransformation> transformations)
{
// defining an array to store new image data
PointColor[] points = new PointColor[bmp.Width * bmp.Height];
// filtering transformations
var pointTransformations =
transformations.Where(s => s.IsColorTransformation == false).ToArray();
var colorTransformations =
transformations.Where(s => s.IsColorTransformation == true).ToArray();
double[,] pointTransMatrix =
CreateTransformationMatrix(pointTransformations, 2); // x, y
double[,] colorTransMatrix =
CreateTransformationMatrix(colorTransformations, 4); // a, r, g, b
// saving some stats to adjust the image later
int minX = 0, minY = 0;
int maxX = 0, maxY = 0;
// scanning points and applying transformations
int idx = 0;
for (int x = 0; x < bmp.Width; x++)
{ // row by row
for (int y = 0; y < bmp.Height; y++)
{ // column by column
// applying the point transformations
var product =
Matrices.Multiply(pointTransMatrix, new double[, ] {
{ x }, { y }
});
var newX = (int)product[0, 0];
var newY = (int)product[1, 0];
// saving stats
minX = Math.Min(minX, newX);
minY = Math.Min(minY, newY);
maxX = Math.Max(maxX, newX);
maxY = Math.Max(maxY, newY);
// applying color transformations
Color clr = bmp.GetPixel(x, y); // current color
var colorProduct = Matrices.Multiply(
colorTransMatrix,
new double[, ] {
{ clr.A }, { clr.R }, { clr.G }, { clr.B }
});
clr = Color.FromArgb(
GetValidColorComponent(colorProduct[0, 0]),
GetValidColorComponent(colorProduct[1, 0]),
GetValidColorComponent(colorProduct[2, 0]),
GetValidColorComponent(colorProduct[3, 0])
); // new color
// storing new data
points[idx] = new PointColor()
{
X = newX,
Y = newY,
Color = clr
};
idx++;
}
}
// new bitmap width and height
var width = maxX - minX + 1;
var height = maxY - minY + 1;
// new image
var img = new Bitmap(width, height);
foreach (var pnt in points)
{
img.SetPixel(
pnt.X - minX,
pnt.Y - minY,
pnt.Color);
}
return(img);
}
