'''' This code is part of Document Solutions for Imaging demos.'' Copyright (c) MESCIUS inc. All rights reserved.''Imports System.IOImports System.DrawingImports System.Collections.GenericImports System.LinqImports System.NumericsImports GrapeCity.Documents.DrawingImports GrapeCity.Documents.TextImports GrapeCity.Documents.ImagingImports GCTEXT = GrapeCity.Documents.TextImports GCDRAW = GrapeCity.Documents.Drawing
'' This sample demonstrates how to use the SaturationEffect.Public Class Saturation    Function GenerateImage(        ByVal pixelSize As Size,        ByVal dpi As Single,        ByVal opaque As Boolean,        Optional ByVal sampleParams As String() = Nothing) As GcBitmap
        opaque = False        Dim bmp = New GcBitmap(pixelSize.Width, pixelSize.Height, opaque, dpi, dpi)        Using origBmp = New GcBitmap()            '' Load a sample photo:            Dim imagePath = Path.Combine("Resources", "ImagesBis", "butterfly.jpg")            Using stm = New FileStream(imagePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.RandomAccess)                origBmp.Load(stm)            End Using
            origBmp.SetAlphaTo255()            origBmp.Opaque = False
            '' Resize the original photo so we can place 4 samples of it            '' on the resulting bitmap:            Dim w = pixelSize.Width / 2            Dim h = pixelSize.Height / 2            Using sizedBmp = origBmp.Resize(w, h, InterpolationMode.Cubic)                '' Copy the resized original into 4 quadrants of the resulting bitmap:                bmp.BitBlt(sizedBmp, 0, 0)                bmp.BitBlt(sizedBmp, w, 0)                bmp.BitBlt(sizedBmp, 0, h)                bmp.BitBlt(sizedBmp, w, h)            End Using
            '' Keep the pixels in top left quadrant intact,            '' apply effects to the other 3 quadrants:            Dim lineh = 2            bmp.ApplyEffect(SaturationEffect.Get(0.5F), New Rectangle(w + lineh, 0, w - lineh, h - lineh))            bmp.ApplyEffect(SaturationEffect.Get(0.3F), New Rectangle(0, h + lineh, w - lineh, h - lineh))            bmp.ApplyEffect(SaturationEffect.Get(1.6F), New Rectangle(w + lineh, h + lineh, w - lineh, h - lineh))
            '' Add borders between the quadrants, and captions for each:            Using g = bmp.CreateGraphics(Nothing)                Dim foreColor = Color.Yellow                Dim backColor = Color.Blue                Dim fnt = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "FreeMono.ttf"))                g.DrawLine(w, 0, w, h * 2, New GCDRAW.Pen(Color.Gray, lineh * 2))                g.DrawLine(0, h, w * 2, h, New GCDRAW.Pen(Color.Gray, lineh * 2))                Dim tf = New TextFormat() With {.Font = fnt, .FontSize = 18, .ForeColor = foreColor, .BackColor = backColor, .FontBold = True}                Dim th = g.MeasureString("QWERTY", tf).Height                g.DrawString(" Original image ", tf, New PointF(0, h - th + lineh))                g.DrawString(" Saturation 0.5 ", tf, New PointF(w + lineh, h - th + lineh))                g.DrawString(" Saturation 0.3 ", tf, New PointF(0, h * 2 + lineh - th + lineh))                g.DrawString(" Saturation 1.6 ", tf, New PointF(w + lineh, h * 2 + lineh - th + lineh))            End Using        End Using
        Return bmp    End FunctionEnd Class