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      • vb.net教程之圖形控件

      • 2015-01-17 22:49 來源:未知
      圖形控件(相關vb.net教程)
      Picturebox:圖片框
      作用:加載圖片與圖片處理。
      常用屬性:
      Image:加載圖形.
      Sizemode:設置圖片的顯示格式.有4個可選項:
      Normal—默認值,在左上角顯示.
      Stretchimage圖片隨框的大小而自動縮放,總顯示完整
      Autosize—框根據圖片的大小而大小變化.
      Centerimage—圖片在框中居中顯示.
      應用見,圖片框的sizemode屬性
      程序如下:
      Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
              PictureBox1.SizeMode = PictureBoxSizeMode.Normal
          End Sub
       
          Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
              PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage
          End Sub
       
          Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
              PictureBox1.SizeMode = PictureBoxSizeMode.CenterImage
          End Sub
       
          Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
              PictureBox1.SizeMode = PictureBoxSizeMode.AutoSize
          End Sub
      Imagelist:圖片列表
      作用:加載圖片,以備其它控件使用。
      常用屬性:
      Colordepth:顏色深度,此值越大圖像越清晰,使用時要先設置此值,然后加載圖片.如果加載過了圖片再設置此項則已不起作用了.
      Imagesize:圖像大小
      Images:圖像排列,依序裝入圖片,序號從0開始.
      綜合應用:
      練習:制作一個可以瀏覽圖片的軟件。
      見,圖片瀏覽軟件.
      3:制作一個可以加載圖片、交換圖片及圖片縮放處理的軟件,見加載交換圖片。[實驗報告24]
      程序為:
      加載圖片部分:
      Public Class Form1
          Private Sub Button1.Click
              'PictureBox1.Image = ImageList1.Images(0)
              'PictureBox2.Image = ImageList1.Images(1)
              PictureBox1.Image = Image.FromFile("g:\1.jpg")
              PictureBox2.Image = Image.FromFile("g:\2.jpg")
          End Sub
      交換圖片部分:
          Private Sub Button2_Click
              PictureBox3.Image = PictureBox1.Image
              PictureBox1.Image = PictureBox2.Image
              PictureBox2.Image = PictureBox3.Image
              PictureBox3.Image = Nothing
          End Sub
      縮放部分的程序:
      Private Sub Button4_Click
              PictureBox1.Width = PictureBox1.Width - 30
              PictureBox1.Height = PictureBox1.Height - 30
          End Sub
       
          Private Sub Button5_Click
              PictureBox1.Width = PictureBox1.Width + 30
              PictureBox1.Height = PictureBox1.Height + 30
          End Sub
          Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
              End
          End Sub
      End Class
      說明:加載圖片有兩種方法:
      A、借助imagelist提供的圖片,如:PictureBox1.Image = ImageList1.Images(0)
      b、用fromfile方法,如picturebox1.image=image.fromfile(“h:\2.jpg”)
      panel面板:是一個圖片框(picturebox)的容器,它可以帶滾動條,常用的設置為:
      將picturebox放置在panel上,然后將picturebox的縮放模式,設置為autosize,將panel的autoscroll設置為真。程序見,panel面版與picturebox
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