'''' This code is part of Document Solutions for Imaging demos.'' Copyright (c) MESCIUS inc. All rights reserved.''Imports System.DrawingImports GrapeCity.Documents.DrawingImports GrapeCity.Documents.TextImports GrapeCity.Documents.ImagingImports GCTEXT = GrapeCity.Documents.Text
'' This sample demonstrates how to draw round rectangles'' using dedicated DrawRoundRect/FillRoundRect methods.'' It also shows how the same result may be achieved with'' graphics paths.Public Class RoundRectangle    Function GenerateImage(        ByVal pixelSize As Size,        ByVal dpi As Single,        ByVal opaque As Boolean,        Optional ByVal sampleParams As String() = Nothing) As GcBitmap
        Dim bmp = New GcBitmap(pixelSize.Width, pixelSize.Height, True, dpi, dpi)        Dim Inch = dpi        Using g = bmp.CreateGraphics(Color.RoyalBlue)            Dim rc = Util.AddNote(                "GcGraphics has dedicated methods to easily draw and fill rectangles with rounded corners. " +                "This sample also shows how the same result may be achieved using graphics paths. " +                "While they are not really needed for drawing round rectangles, graphics paths allow " +                "to draw and fill arbitrary figures with complex geometries.",                g)
            '' Rounded rectangle's radii:            Dim rx = 36, ry = 24
            '' Using dedicated methods to draw And fill round rectangles:            Dim rEasy = New RectangleF(rc.Left, rc.Bottom + Inch / 2, Inch * 2, Inch)            g.FillRoundRect(rEasy, rx, ry, Color.PaleGreen)            g.DrawRoundRect(rEasy, rx, ry, Color.Blue, 4)            '' Add a label:            Dim tf = New TextFormat() With            {                .Font = GCTEXT.Font.FromFile(IO.Path.Combine("Resources", "Fonts", "FreeSerif.ttf")),                .FontSize = Inch / 6            }            g.DrawString("The easy way.", tf, rEasy, TextAlignment.Center, ParagraphAlignment.Center, False)
            '' Using graphics path to achieve the same result:            Dim rHard = rEasy            rHard.Offset(0, rEasy.Height + Inch / 2)            Dim path = MakeRoundRect(g, rHard, rx, ry)            g.FillPath(path, Color.PaleVioletRed)            g.DrawPath(path, Color.Purple, 4)            '' Add a label:            g.DrawString("The hard way.", tf, rHard, TextAlignment.Center, ParagraphAlignment.Center, False)        End Using        '' Done        Return bmp    End Function
    '' This method shows how to create a graphics path that may be used    '' to fill Or draw arbitrary shapes on a GcGraphics.    Private Function MakeRoundRect(ByVal g As GcGraphics, ByVal rc As RectangleF, ByVal rx As Single, ByVal ry As Single) As IPath        Dim path = g.CreatePath()        Dim sz = New SizeF(rx, ry)        '' start from horizontal top left        path.BeginFigure(New PointF(rc.Left + rx, rc.Top))        path.AddLine(New PointF(rc.Right - rx, rc.Top))        path.AddArc(New ArcSegment() With {.Point = New PointF(rc.Right, rc.Top + ry), .SweepDirection = SweepDirection.Clockwise, .Size = sz})        path.AddLine(New PointF(rc.Right, rc.Bottom - ry))        path.AddArc(New ArcSegment() With {.Point = New PointF(rc.Right - rx, rc.Bottom), .SweepDirection = SweepDirection.Clockwise, .Size = sz})        path.AddLine(New PointF(rc.Left + rx, rc.Bottom))        path.AddArc(New ArcSegment() With {.Point = New PointF(rc.Left, rc.Bottom - ry), .SweepDirection = SweepDirection.Clockwise, .Size = sz})        path.AddLine(New PointF(rc.Left, rc.Top + ry))        path.AddArc(New ArcSegment() With {.Point = New PointF(rc.Left + rx, rc.Top), .SweepDirection = SweepDirection.Clockwise, .Size = sz})        path.EndFigure(FigureEnd.Closed)        Return path    End FunctionEnd Class