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如何在WinForms中绘制图像反射?

gdi+ winforms .net c#

NotDan · 技术社区 · 16 年前

我想在图像的C(WinForms)中绘制一个反射,因此我需要能够水平翻转图像。我知道我可以用image.rotateflip来完成这个操作,但是这种方法的问题是我必须翻转图像两次,这样我才能在下一次绘制时在右边再次绘制它。每幅图片每画两次这样做似乎很慢。

我想做翻转时,我画的图像,所以我只需要翻转它一次,但我找不到任何方法做这件事。这有可能吗?

我考虑的另一种方法是以某种方式翻转图形对象,正常地绘制图像,然后将图形对象向后翻转,以便下一次绘制正确。如果这比将图像翻转两次快,有可能吗?

另外,我不想在内存中保留两个图像,因此我无法复制该图像并翻转克隆。

2 回复 | 直到 16 年前

Shoban 16 年前

此代码来自 here 看看有没有什么帮助。

using System;
using System.Drawing;
using System.Windows.Forms;

class ImageReflection: Form
{
     Image image = Image.FromFile("Color.jpg");

     public static void Main()
     {
          Application.Run(new ImageReflection());
     }
     public ImageReflection()
     {
          ResizeRedraw = true;

     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }     
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          int cxImage = image.Width;
          int cyImage = image.Height;

          grfx.DrawImage(image, cx / 2, cy / 2,  cxImage,  cyImage);
          grfx.DrawImage(image, cx / 2, cy / 2, -cxImage,  cyImage);
          grfx.DrawImage(image, cx / 2, cy / 2,  cxImage, -cyImage);
          grfx.DrawImage(image, cx / 2, cy / 2, -cxImage, -cyImage);
     }
}

Fredou 16 年前

编辑

~~也像这样?~~

     draw(new Bitmap (img).rotateflip(param))

好的,rotateflip不返回图像

looking at this 只有一个翻转就足够了。不?

RotateNoneFlipNone  Specifies no rotation and no flipping.
Rotate90FlipNone    Specifies a 90-degree rotation without flipping.
Rotate180FlipNone   Specifies a 180-degree rotation without flipping.
Rotate270FlipNone   Specifies a 270-degree rotation without flipping.
RotateNoneFlipX Specifies no rotation followed by a horizontal flip.
Rotate90FlipX   Specifies a 90-degree rotation followed by a horizontal flip.
Rotate180FlipX  Specifies a 180-degree rotation followed by a horizontal flip.
Rotate270FlipX  Specifies a 270-degree rotation followed by a horizontal flip.
RotateNoneFlipY Specifies no rotation followed by a vertical flip.
Rotate90FlipY   Specifies a 90-degree rotation followed by a vertical flip.
Rotate180FlipY  Specifies a 180-degree rotation followed by a vertical flip.
Rotate270FlipY  Specifies a 270-degree rotation followed by a vertical flip.
RotateNoneFlipXY    Specifies no rotation followed by a horizontal and vertical flip.
Rotate90FlipXY  Specifies a 90-degree rotation followed by a horizontal and vertical flip.
Rotate180FlipXY Specifies a 180-degree rotation followed by a horizontal and vertical flip.
Rotate270FlipXY Specifies a 270-degree rotation followed by a horizontal and vertical flip.