访问在C＃中的单个像素 [英] Access to a single pixel in C#

问题描述

我工作的一所学校的项目现在。它的意思是3D编辑软件，（像玛雅的一个非常最小化版本）。我将它写在C＃中，使用Windows应用程序项目。
我打算实​​施自己的所有的3D的东西，从预测到阴影。
我的问题是，我怎样才能在C＃Windows应用程序直接访问单个像素？
我知道我将不得不在窗口中的主视图端口。但我还没有决定将如何尚未作出。是否有一个内置的对象，我可以使用，这将让我定义视图港口的边界，然后逐个绘制每个像素？
（我只是在黑暗中拍摄在这里，我不知道很多关于C＃，我用C主要程序）

I'm working on a school project right now. It's meant to be a 3D editing software, (like a very minimized version of Maya). I have to write it in C#, using the 'Windows Application Project'. I intend to implement all the 3D stuff myself, from projections to shading. My question is, how can I get direct access to a single pixel in the C# windows application? I know I'm going to have a main view port in the window. But I haven't decided yet how it will be made. Is there a built in object that I can use, that will let me define the boundaries of the view port, and then paint each pixel individually? (I'm just shooting in the dark here, I don't know much about C#. I mostly program in C)

谢谢，$ B $ ; b马勒基

Thanks, Malki.

推荐答案

使用的createGraphics（）方法，这应该工作：

Using the CreateGraphics() method, this should work:

Bitmap b = new Bitmap(Width, Height, this.CreateGraphics());
//pixel is:
Color c = b.GetPixel(x, y);

要设置一个像素到一个特定的颜色，用它来代替颜色为c = b.GetPixel（X，Y）：

To set a pixel to a specific colour, use this instead of Color c = b.GetPixel(x,y):

b.SetPixel(x, y, c); // where c is a Color

如果你想有一个视口中，将面板或一个图片（也许与码头：填充），然后使用：

If you want a viewport, place a panel or a PictureBox (maybe with Dock: Fill), then use:

Bitmap b = new Bitmap(viewport.Width, viewport.Height, viewport.CreateGraphics());

代替以前使用的第一行。

instead of the first line used previously.

但是，从你想做的事，我认为这将是更好地使用OnPaint事件：

But from what you want to do, I think it would be better to use the OnPaint event:

void pnlViewport_Paint(object sender, PaintEventArgs e) {
    if ( e.ClipRectange.Width < 1 || e.ClipRectangle.Height < 1 ) return;
    Bitmap b = new Bitmap(e.ClipRectangle.Width, e.ClipRectangle.Height, e.Graphics);
    // ...
}

这事件触发每次控制需要涂漆。第一行检查正在绘制的区域是否为空 - 这将不只是节省CPU时间，但您的应用程序可能会崩溃 - 你得到它做一个为0x0位图

This event fires every time the control needs painted. The first line checks whether the area being drawn is empty - this will not just save CPU time, but your application may crash - you are getting it to make a 0x0 bitmap.

修改：是的，这是可调整大小，如果码头= DockStyle.Fill;当您调整窗口大小，控制扩展，以填补空间。然后将其粉刷 - 射击事件。

EDIT: Yes, this is resizable, if Dock = DockStyle.Fill; As your window resizes, the control expands to fill the space. It is then repainted - firing the event.

编辑2 ：正如有人指出的那样，这仍然缓慢。这听起来像是一个要求做3D绘图自己，所以也许 SDL.NET （我认为可以使用硬件加速）是要走的路。它甚至有一个（慢）SurfaceControl使用。

EDIT 2: As pointed out by others, this is still slow. It does sound like it is a requirement to do the 3D drawing yourself, so maybe SDL.NET (which I think can use hardware acceleration) is the way to go. It even has a (slow) SurfaceControl to use.

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