/// <summary>
/// Constructs a new Selection.
/// </summary>
/// <param name="pixels">The IPixels from which
/// pixels should be selected.</param>
/// <param name="rect">The Rectangle of pixels to use.</param>
public Selection(IPixels pixels, PixRect rect)
{
this.pixels = pixels;
this.rect = rect;
}
/// <summary>
/// Crops this ManipulableImage to the specified Rectangle.
/// </summary>
/// <param name="rect">The Rectangle to crop to.</param>
/// <param name="pixels">The new array that will be used to store
/// this ManipulableImage's pixels.</param>
public void Crop(PixRect rect, int[] pixels)
{
for (int row = rect.Row; row < rect.Row + rect.Height; row++)
{
Buffer.BlockCopy(
Pixels, sizeof(int) * (row * Width + rect.Col),
pixels, sizeof(int) * (row - rect.Row) * rect.Width,
sizeof(int) * rect.Width);
}
this.pixels = new PixelsArray(rect.Height, rect.Width, pixels);
}
/// <summary>
/// Draws a filled rectangle.
/// </summary>
/// <param name="pixels">The IPixels to draw on.</param>
/// <param name="rect">The rectangle to draw.</param>
/// <param name="rgb">The color to use.</param>
public static void FillRect(IPixels pixels, PixRect rect, int rgb)
{
Selection selection = new Selection(pixels, rect);
Shaders.Apply(selection, Shaders.SolidColor(rgb));
}
/// <summary>
/// Crops this ManipulableImage to the specified Rectangle.
/// </summary>
/// <param name="rect">The Rectangle to crop to.</param>
public virtual void Crop(PixRect rect)
{
Crop(rect, new int[rect.Height * rect.Width]);
}
