Question

vb中如何根据PictureBox的大小自动调整相片

Answer 1

添加两个Picture控件，先载入Picture2，然后根据Picture1的大小自动调整显示。

代码如下：

Private Sub Form_Load()
    Picture1.AutoRedraw = True '重绘图片
    Picture1.AutoSize = False   '图片框大小不变
    Picture1.Visible = True
    'Picture1.BackColor = RGB(255, 255, 255) '设置图片框背景颜色
    Picture2.AutoSize = True 'Picture2自动缩放以适应图片，不可见
    Picture2.Visible = False
End Sub
Private Sub Command1_Click()
        Picture2.Picture = LoadPicture("C:\2.jpg")          '图片加载到Pic2
        If Picture2.ScaleWidth > Picture2.ScaleHeight Then
            imageWidth = Picture1.ScaleWidth
            imageHeight = Picture1.ScaleHeight * Picture2.ScaleHeight / Picture2.ScaleWidth
        Else
            imageWidth = Picture1.ScaleWidth * Picture2.ScaleWidth / Picture2.ScaleHeight
            imageHeight = Picture1.ScaleHeight
        End If
        Picture1.Cls
        Picture1.PaintPicture Picture2, (Picture1.ScaleWidth - imageWidth) / 2, (Picture1.ScaleHeight - imageHeight) / 2, imageWidth, imageHeight, 0, 0, Picture2.ScaleWidth, Picture2.ScaleHeight
End Sub

效果(由于图片小，于是调整后上下空出来了)：

Answer 2

主要是坐标的换算，将picturebox的坐标与shape的坐标一致，如此只要用鼠标调节shape大小来调节picture的大小调整相片。

Answer 3

Picture1.PaintPicture Picture1.Picture, 0, 0, Picture1.Width, Picture1.Height

Answer 4

Picture1.PaintPicture Picture2, 0, 0, Picture1.Width, Picture1.Height, 0, 0, Picture2.Width, Picture2.Height