如何更改表单(渐变)运行时的颜色? [英] how to change the color of the form (gradient) runtime?

问题描述

大师，
因为语言不好意思，

我想将表单(渐变)的颜色从低级颜色更改为高级颜色，就像进度条一样，几乎就像启动屏幕一样，显示表单然后将其隐藏，
但我不能:(

最好的祝愿和梦想...

hi masters,
excuse me because of the language,

i want to change the color of the form (gradient) for a while from low level of the color to the high , like a progress bar, almost like a splash screen, show the form & then hide it,
but i CAN''T :(

best wishes & dreams...

推荐答案

覆盖方法Form.OnPaint.在此方法中，使用通过事件参数参数传递给您的System.Drawing.Graphics实例，并使用其方法System.Drawing.Graphics.FillRectangle在窗体上绘画.对于画笔，请使用渐变画笔System.Drawing.Drawing2D.LinearGradientBrush.

请参阅:
http://msdn.microsoft.com/en-us/library/yysstebh.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/system. drawing.drawing2d.lineargradientbrush.aspx [ ^ ].

不要忘记布置实现System.IDisposable的对象.做到这一点并保证即使抛出异常也会发生的最佳方法是使用using语句，该语句的作用与try-finally块相同:
http://msdn.microsoft.com/en-us/library/system.idisposable.aspx [^ ]，
http://msdn.microsoft.com/en-us/library/yh598w02％28v = vs.100％29.aspx [ ^ ].

您可能会遇到一些闪烁.您可以在表单(或其他控件)中使用双缓冲来消除它，在该表单中您可以进行自定义呈现:
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.doublebuffered.aspx [ ^ ].

致以最良好的祝愿和唤醒……:-)

—SA

Override the method Form.OnPaint. In this method, use the instance of System.Drawing.Graphics passed to you via the event argument parameters, and paint on the form using its method System.Drawing.Graphics.FillRectangle. For a brush, use a gradient brush System.Drawing.Drawing2D.LinearGradientBrush.

Please see:
http://msdn.microsoft.com/en-us/library/yysstebh.aspx[^],
http://msdn.microsoft.com/en-us/library/system.drawing.drawing2d.lineargradientbrush.aspx[^].

Don''t forget to dispose the objects which implement System.IDisposable. The best way of doing it and guarantee that it happens even if an exception is thrown, is using the using statement, which acts identically to the try-finally block:
http://msdn.microsoft.com/en-us/library/system.idisposable.aspx[^],
http://msdn.microsoft.com/en-us/library/yh598w02%28v=vs.100%29.aspx[^].

You may face some flicker. You can eliminate it using double buffering for the form (or other control) where you do your custom rendering:
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.doublebuffered.aspx[^].

Best wishes and wake-ups… :-)

—SA

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