使pictureBox透明MDI格式 - VB.Net [英] Make pictureBox Transparent over MDI form - VB.Net

问题描述

好的家伙，今天的问题是这样的：

我有一个显然包含所有其他表格的MDI表格。

在我程序的主菜单上（在MDI表格上），我想要放置4个pictureBox。

现在，mdi的BackgroundImage没有设置为none，我正在加载我自己的图片并拉伸它。图片框backColor设置为透明。当我运行代码，而不是在pictureBox上的透明背景，我可以看到mdi的BackgroundImage，我只能看到白色背景（或灰色）。任何想法？

谢谢，

oron。

解决方案

我想这是关于理解还是透明度 。在原始效果中，没有任何东西是透明的：对于不同的像素，你只有不同的颜色，并且像素总是100％不透明。

当你移动时，透明效果会出现（而不是隐喻）一些对象超过非均匀背景。然后背景表现为一些透视图案;结果像素由背景和前景的颜色组合而成。在统一的背景下，透明度是不可检测的。没有办法发现半透明图像之间的差异，或者根据一些不透明度值以一定比例着色的背景颜色的100％不透明图像。



现在：两个建议可能会出乎意料：

• 几乎从不使用 PictureBox 。除了最简单的情况外，这种控制完全是多余的，不会给你带来任何好处（但可能会增加许多麻烦）。透明度已经不是一个简单的案例。而是在自己的某些 Control 上渲染一些 Image 。显示一些半透明图像非常简单。



• 永远不要使用MDI。不要折磨自己，吓跑你的顾客。您将在下面引用的一些过去的答案中看到我建议做的事情。

对我过去答案的一些参考：

在图片框中附加图片 [ ^ ]，

在C＃中绘制一个矩形 [ ^ ]，

如何清除来自旧图纸的面板 [ ^ ]，

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 [ ^ ]，

如何在WPF中创建MDI父窗口？ [解决方案2 ]，

关于在WPF中使用MDI窗口的问题 [ ^ ]，

麦当劳给出错误 [ ^ ]，

如何设置子表单最大化，最后一个子表单最小化 [ ^ ]。



祝你好运。

-SA

o.k guys, the problem today goes like this:
I have an MDI form which contains all the other forms obviously.
on the main menu of my program (on the MDI form), i want to lay 4 pictureBox's.
Now, the BackgroundImage of the mdi is NOT set to none and i am loading my own picture and stretch it. the picturebox backColor is set to Transparent. when i run the code, instead of transparent Background on the pictureBox where i can see the BackgroundImage of the mdi, all i can see is white Background (or Gray). any ideas?
thanks,
oron.

解决方案

I guess this is about understanding or "transparency". In raw effect, nothing is transparent: you just have different colors for different pixels, and the pixel is always 100% opaque.
The effect of transparency comes up (rather as a metaphor), when you move some object over non-uniform background. Then the background behave as some see-through pattern; the resulting pixels are composed of the combination of colors of background and foreground. On a uniform background, "transparency" is undetectable. There is no a way to spot the difference between the semi-transparent image, or some 100% opaque image tinted with the background color in certain proportion depending on some opaqueness value.

Now: two recommendations which may come at surprise:

• Almost never use PictureBox. This control is totally redundant and won't give you any benefits (but may add a lot of troubles), except the simplest possible cases. Transparency is already not the simple case. Instead, render some Image on some Control yourself. Showing some semi-transparent image is quite trivial.


• Never use MDI. Don't torture yourself and scare off you customers. You will see what I recommend to do in some of the past answers referenced below.

Some references to my past answers:
Append a picture within picturebox[^],
draw a rectangle in C#[^],
How do I clear a panel from old drawing[^],
What kind of playful method is Paint? (DataGridViewImageCell.Paint(...))[^],
capture the drawing on a panel[^],
Drawing Lines between mdi child forms[^],
How to Create MDI Parent Window in WPF? [Solution 2],
Question on using MDI windows in WPF[^],
MDIContainer giving error[^],
How to set child forms maximized, last childform minimized[^].

Good luck.

—SA

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