画画上使用C#如何绘制图纸图片框图片框
回答
鼠标拖动您可以通过捕获图片框的鼠标移动事件,然后得到像图片框图形做到这一点。
Graphics g = pictureBox.CreateGraphics(); 然后你可以绘制任何你想要使用这个图形对象绘制
把一个PictureBox放在你的窗体上,并将其BackColor设置为白色。然后将此代码添加到您的窗体(你必须低于实际挂钩的鼠标事件,即你不能只是复制该代码粘贴到您的形式):
private Point? _Previous = null;
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
_Previous = e.Location;
pictureBox1_MouseMove(sender, e);
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (_Previous != null)
{
if (pictureBox1.Image == null)
{
Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
using (Graphics g = Graphics.FromImage(bmp))
{
g.Clear(Color.White);
}
pictureBox1.Image = bmp;
}
using (Graphics g = Graphics.FromImage(pictureBox1.Image))
{
g.DrawLine(Pens.Black, _Previous.Value, e.Location);
}
pictureBox1.Invalidate();
_Previous = e.Location;
}
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
_Previous = null;
}
再画了!
如果您愿意,可以通过设置Graphics
对象的SmoothingMode
属性来改善绘制图像的质量。
更新:的.Net CF简化版,有Pens
集合,MoustEventArgs
没有Location
,所以这里是一个CF的版本:
private Point? _Previous = null;
private Pen _Pen = new Pen(Color.Black);
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
_Previous = new Point(e.X, e.Y);
pictureBox1_MouseMove(sender, e);
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (_Previous != null)
{
if (pictureBox1.Image == null)
{
Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
using (Graphics g = Graphics.FromImage(bmp))
{
g.Clear(Color.White);
}
pictureBox1.Image = bmp;
}
using (Graphics g = Graphics.FromImage(pictureBox1.Image))
{
g.DrawLine(_Pen, _Previous.Value.X, _Previous.Value.Y, e.X, e.Y);
}
pictureBox1.Invalidate();
_Previous = new Point(e.X, e.Y);
}
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
_Previous = null;
}
谢谢你的帮助,但我得到的错误不知道钢笔和电子地址 – Gold 2010-04-26 13:32:39
@金:刚刚添加了这种方法的CF友好版本,因为CF没有Pens集合,MouseEventArgs没有一个位置(只是X和Y)。 – MusiGenesis 2010-04-26 14:16:26
+1对一个简短的,没有措辞很好的问题做了详细的回答。 :) – JYelton 2010-04-26 14:17:49
这里,pictureBox1 ==签名。我翻译了以这种方式VB:
全球:
Dim _previous As Point = Nothing
Dim _pen As Pen = New Pen(Color.Black)
Dim drawing As Boolean = False
''' <summary>
''' This handles the signature drawing events (drawing)
''' </summary>
''' <param name="sender"></param>
''' <param name="e"></param>
''' <remarks></remarks>
Private Sub signature_MouseMove(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles signature.MouseMove
If drawing = True Then
If signature.Image Is Nothing Then
Dim bmp As Bitmap = New Bitmap(signature.Width, signature.Height)
Using g As Graphics = Graphics.FromImage(bmp)
g.Clear(Color.White)
End Using
signature.Image = bmp
End If
Using g As Graphics = Graphics.FromImage(signature.Image)
g.DrawLine(_pen, _previous.X, _previous.Y, e.X, e.Y)
End Using
signature.Invalidate()
_previous = New Point(e.X, e.Y)
End If
End Sub
''' <summary>
''' this indicates somebody is going to write a signature
''' </summary>
''' <param name="sender"></param>
''' <param name="e"></param>
''' <remarks></remarks>
Private Sub signature_MouseDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles signature.MouseDown
_previous = New Point(e.X, e.Y)
drawing = True
signature_MouseMove(sender, e)
End Sub
''' <summary>
''' the signature is done.
''' </summary>
''' <param name="sender"></param>
''' <param name="e"></param>
''' <remarks></remarks>
Private Sub signature_MouseUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles signature.MouseUp
_previous = Nothing
drawing = False
End Sub
- 1. 绘制图片框C#
- 2. 如何正确绘制图片框?
- 3. 图片框在图片框
- 4. 图片图片框
- 5. 如果图片框小于图片,图像适合图片框
- 6. 在图片框中缓慢绘制图片
- 7. 图片缩放图片框
- 8. 导入图片图片框
- 9. 分配绘制到图片框
- 10. 在Panel-Panel里面绘制图片框#
- 11. 如何在c中的图片框上绘制图形#
- 12. 如何避免位图,而在图片框绘制
- 13. 在C#中的图片框内绘图
- 14. 如何绘制缩放图片框没有重绘新的点
- 15. 如何将图片框动态添加到图片框阵列
- 16. 如何绘制黑白图片mandelbrot图
- 17. 乘图片框
- 18. 在图片框
- 19. 图片/相框
- 20. 慢图片框
- 21. 在图片框
- 22. 控制移动图片框
- 23. 如何刷新图片框
- 24. 如何居中图片框
- 25. 如何在图片框
- 26. 如何旋转图片框
- 27. 如何制作带框的图片?
- 28. 如何制作滑动图片/框架?
- 29. 绘制图纸
- 30. 更改图片框中的图片C#
Eeeeep,上帝没有!你会得到这样的图形图形,我知道的唯一一个用于.CreateGraphics()的用例是测量字符串。你想重写OnPaint。 – Quibblesome 2009-10-08 11:27:26
或使用.Image属性。如果我们要做自定义绘图,尽管我会完全停止使用picturebox,并从Control继承。 – Quibblesome 2009-10-08 11:28:18