如何在cpp / cli上的图片框中旋转图像 [英] How to rotatie image in a picturebox on cpp/cli

问题描述

你好我是c ​​++ / cli的初学者，我想制作一个旋转图像的程序，我在c＃中看到一个例子，我想在cpp / cli上编程

但是我的程序中有错误，你能帮我吗



例如＃http://www.codeproject.com/Articles/58815/C -Image-PictureBox-Rotations



谢谢

Hello i'm a beginer on c++/cli, i want to make a program that rotate an image in a picturboxe, i see an exemple in c#, i want to program it on cpp/cli
but i had errors in my programe, can you help me please

the exemplei n c# http://www.codeproject.com/Articles/58815/C-Image-PictureBox-Rotations

Thanks

推荐答案

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Please post your question in the forum at the end of the article.

在 PictireBox 中旋转任何东西都是个坏主意。你需要旋转图像，而不是控制，这根本不会帮助你，只会增加麻烦并浪费一些资源而不给予任何回报。相反，在您的重写方法 OnPaint Panel 。 $ c>或事件的处理程序 OnPaint 。 PictireBox 实际上也是如此，只是没有你对它的直接控制。有关详细信息，请参阅我过去的答案：

在图片框中附加图片 [ ^ ]，

如何从旧图纸中清除面板 [ ^ ]，

在C＃中绘制一个矩形 [ ^ ]，

如何避免在DatagridView C＃中使用红十字[ [ ^ ]，

什么样的俏皮方法是Paint？ （DataGridViewImageCell.Paint（...）） [ ^ ]，

在面板上捕获绘图 [ ^ ]，

mdi子表单之间的绘制线 [ ^ ]，

如何加快我的vb.net应用程序？ [ ^ ]。



请注意表格图形 System.Drawing 基于立即模式，而不是保留模式：

https://en.wikipedia.org/wiki/Retained_mode [ ^ ]，

https://en.wikipedia.org/wiki/Immediate_mode_%28computer_graphics%29 [ ^ ]。



现在，关于轮换：这是你可以使用的：

https：// msdn。 microsoft.com/en-us/library/system.drawing.graphics.transform%28v=vs.110%29.aspx [< a href =https://msdn.microsoft.com/en-us/library/system.drawing.graphics.transform%28v=vs.110%29.aspxtarget =_ blanktitle =New Window> ^ ]，

https://msdn.microsoft.com/en-us/library/system.drawing.drawing2d.matrix(v = vs.110）.aspx [ ^ ]，

https： //msdn.microsoft.com/en-us/library/system.drawing.drawing2d.matrix.rotate%28v=vs.110%29.aspx [ ^ ]，

https： //msdn.mi crosoft.com/en-us/library/system.drawing.drawing2d.matrix.rotateat%28v=vs.110%29.aspx [ ^ ]。



轻松，不是吗？

-SA

It's a bad idea to rotate anything in PictireBox. You need to rotate image, not control, which won't help you at all, will only add hassles and waste some resources giving nothing in return. Instead, render the image directly in your control, which could be a custom control or even something like Panel, in your overridden method OnPaint or a handler of the event OnPaint. PictireBox actually does the same, only without your direct control over it. For further detail, please see my past answers:
Append a picture within picturebox[^],
How do I clear a panel from old drawing[^],
draw a rectangle in C#[^],
How to avoid Red Cross in DatagridView C#[^],
What kind of playful method is Paint? (DataGridViewImageCell.Paint(...))[^],
capture the drawing on a panel[^],
Drawing Lines between mdi child forms[^],
How to speed up my vb.net application?[^].

Note that Forms graphics with System.Drawing is based on immediate mode, not retained mode:
https://en.wikipedia.org/wiki/Retained_mode[^],
https://en.wikipedia.org/wiki/Immediate_mode_%28computer_graphics%29[^].

Now, as to the rotation: this is what you can use:
https://msdn.microsoft.com/en-us/library/system.drawing.graphics.transform%28v=vs.110%29.aspx[^],
https://msdn.microsoft.com/en-us/library/system.drawing.drawing2d.matrix(v=vs.110).aspx[^],
https://msdn.microsoft.com/en-us/library/system.drawing.drawing2d.matrix.rotate%28v=vs.110%29.aspx[^],
https://msdn.microsoft.com/en-us/library/system.drawing.drawing2d.matrix.rotateat%28v=vs.110%29.aspx[^].

Easy, isn't it?

—SA

感谢您的重播，但我想用C ++ / CLI编程而不是c＃:)

你可以让我成为一个应用程序，用c ++ / cli将图像从180转到-180

请

Thanks for your replay, but me i want to program that in C++/CLI not in c# :)
could you make me an applicatio, with c++/cli that rotate an image from 180 to -180
Please

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