VB.Net Tutorial/2D Graphics/InterpolationMode

Interpolation mode

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class InterpolationModeDemo
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
public class Form1
  Inherits System.Windows.Forms.Form
  Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
        Dim bm As New Bitmap("yourfile.jpg")
        e.Graphics.DrawImage(bm, 10, 10)
        Dim x As Integer = 10
        Dim y As Integer = 120
        DrawSample(e.Graphics, bm, Drawing2D.InterpolationMode.Default, x, y)
        DrawSample(e.Graphics, bm, Drawing2D.InterpolationMode.Low, x, y)
        DrawSample(e.Graphics, bm, Drawing2D.InterpolationMode.High, x, y)
        DrawSample(e.Graphics, bm, Drawing2D.InterpolationMode.Bilinear, x, y)
        x = 10
        y += 100
        DrawSample(e.Graphics, bm, Drawing2D.InterpolationMode.Bicubic, x, y)
        DrawSample(e.Graphics, bm, Drawing2D.InterpolationMode.NearestNeighbor, x, y)
        DrawSample(e.Graphics, bm, Drawing2D.InterpolationMode.HighQualityBilinear, x, y)
        DrawSample(e.Graphics, bm, Drawing2D.InterpolationMode.HighQualityBicubic, x, y)
    End Sub
    Private Sub DrawSample(ByVal gr As Graphics, ByVal bm As Bitmap, ByVal interpolation_mode As Drawing2D.InterpolationMode, ByRef x As Integer, ByVal y As Integer)
        gr.DrawString(interpolation_mode.ToString, Me.Font, Brushes.Black, x, y)
        gr.InterpolationMode = interpolation_mode
        gr.DrawImage(bm, x, y + 20, 50, 50)
        gr.InterpolationMode = interpolation_mode
        Dim src_rect As New Rectangle(35, 35, 30, 30)
        Dim dest_rect As New Rectangle(x + 60, y + 20, 50, 50)
        gr.DrawImage(bm, dest_rect, src_rect, GraphicsUnit.Pixel)
        gr.DrawRectangle(Pens.Black, dest_rect)
        x += 120
    End Sub
  Public Sub New()
   
    MyBase.New()
    Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
    Me.ClientSize = New System.Drawing.Size(292, 273)
    Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
  End Sub
End Class