主题：正方形图片伸缩成梯形图片

Dim originalImage As Image = Image.FromFile(txt3 & "\" & t(zdw) & ".png")

    

    ' 创建一个新的Bitmap对象，用于存储转换后的梯形图片

    Dim width As Integer = originalImage.Width

    Dim height As Integer = originalImage.Height

    Dim newImage As New Bitmap(width, height)

    

    ' 使用Graphics对象来绘制图像

    Using g As Graphics = Graphics.FromImage(newImage)

        ' 创建一个Matrix对象来定义变换

        Dim matrix As New Matrix()

        

        ' 定义梯形的变换参数

            ' 这里假设我们想要一个顶部宽度比底部宽度小的梯形

        ' 需要根据实际需求调整参数

        Dim topWidth As Single = width * 0.8F

        Dim bottomWidth As Single = width

        Dim heightFactor As Single = 1F

        

        ' 计算梯形的顶部和底部中心点

        Dim topCenter As Single = topWidth / 2F

        Dim bottomCenter As Single = bottomWidth / 2F

        

        ' 应用梯形变换

        matrix.Shear(topCenter, bottomCenter, heightFactor, 0)

        

        ' 创建一个GraphicsPath对象来定义梯形的路径

        Dim path As New GraphicsPath()

        path.AddLine(topCenter, 0, topCenter, heightFactor * height)

        path.AddLine(topCenter, heightFactor * height, bottomCenter, height)

        path.AddLine(bottomCenter, height, bottomCenter + (bottomWidth - topWidth) / 2, heightFactor * height)

        path.AddLine(bottomCenter + (bottomWidth - topWidth) / 2, heightFactor * height, bottomCenter + (bottomWidth - topWidth), 0)

        path.CloseAllFigures()

        

        ' 将路径应用于Graphics对象

        g.SmoothingMode = SmoothingMode.AntiAlias

        g.InterpolationMode = InterpolationMode.HighQualityBicubic

        g.PixelOffsetMode = PixelOffsetMode.HighQuality

        g.DrawImage(originalImage, path)

        

        ' 显示转换后的梯形图片

        p3.Image = newImage

    End Using

    newImage.Save(txt3 & "\" & t(zdw) & "-tx.png")
此主题相关图片如下：1.png