Question

我有一个绘图程序，显示正在编辑的图像的放大版本，我将插值模式设置为“最近邻居”。此外，我有一个像素网格，在那里绘制，网格完全在每个地方，图像上有一个像素。因此它会向您显示准确的像素数量。我添加了一个画笔在图片框上绘制，但我希望画笔精确地绘制在正方形上，就像在其他具有像素网格视图的绘图程序中一样。因此，只要鼠标指针位于该像素方块内，它就只会填充它所在的像素方块的内部。以下是代码：（我的图片框名为canvaseditor。）

生成像素网格的代码：

Private Sub canvaseditor_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles canvaseditor.Paint
        If Not bmpNew Is Nothing Then
            e.Graphics.DrawImage(bmpNew, 0, 0)
        End If

        Dim g As Graphics = e.Graphics
        Dim pn As New Pen(Color.DimGray) '~~~ color of the lines

        Dim x As Integer
        Dim y As Integer

        Dim intSpacing As Integer = 8  '~~~ spacing between adjacent lines

        '~~~ Draw the horizontal lines
        x = canvaseditor.Width
        For y = 0 To canvaseditor.Height Step intSpacing
            g.DrawLine(pn, New Point(0, y), New Point(x, y))
        Next

        '~~~ Draw the vertical lines
        y = canvaseditor.Height
        For x = 0 To canvaseditor.Width Step intSpacing
            g.DrawLine(pn, New Point(x, 0), New Point(x, y))
        Next
    End Sub

这是插值代码：（TL14只是众多图片盒中的一个，其中包含将在canvaseditor中编辑的原始图像，而scalefactor只是一个设置为1的变量整数）

If TL14.Image Is Nothing Then
        Else
            canvaseditor.Image = Nothing
            canvaseditor.Image = TL14.Image
            canvaseditor.Width = TL14.Width * 8 + 1
            canvaseditor.Height = TL14.Height * 8 + 1
            'load and draw the image(s) once
            BackgroundImage1 = New Bitmap(TL14.Image)
            bmpNew = New Bitmap(canvaseditor.Width * scaleFactor, canvaseditor.Height * scaleFactor)
            Using g As Graphics = Graphics.FromImage(bmpNew)
                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor
                g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.Half
                g.DrawImage(BackgroundImage1, 0, 0, bmpNew.Width, bmpNew.Height)
            End Using
            canvaseditor.Focus()
            GroupBox13.Focus()
        End If

这允许我点击原始TL14图片框并将图像加载到canvaseditor图片框中，将其缩放到更大的尺寸，绘制像素网格，并在图像拉伸时带走抗锯齿。所以你最终得到了这个：

Screenshot

This is what it does when I draw on it

但是当我画上它时，它并没有完全排列在正方形内部。它只是绘制我的鼠标所在的位置，所以如何限制它呢？

在VB.NET中绘制网格内的像素

0 个答案: