MFC中的Paint应用 [英] Paint Application in MFC

问题描述

我正在MFC中开发类似于Ms Paint的应用程序，但是我遇到了问题，例如我无法保留绘制的形状，因为在调用了invalidate之后窗口被重新绘制，
请帮助我，因为我是MFC的初学者.

解决方案

请看微软提供的涂鸦示例项目.

当然会发生.您必须记录动作并在WM_PAINT(MFC中的OnPaint)上重画

如果绘画动作很复杂无法记录(如手绘形状，而不是线条，矩形等)，您可以绘制到屏幕外的内存DC(MFC中的CDC :: CreateCompatibleDC-想象为位图)并在那里绘制.稍后，您可以使用OnPaint上的CDC-> BitBlt从该DC绘制到屏幕上

我不是MFC向导，我已经习惯了API.我建议您通过ms​​dn获取有关类的更多信息

将点存储在结构中，然后使用这些点在OnPaint中绘制形状.

Hi,
I am developing a Ms Paint like application in MFC ,but I am having problem like i am not able to retain the drawn shape,as the window is getting repainted after invalidate is getting called,
Please help me as I am kind a beginner in MFC .

解决方案

Look at the scribble sample project provided by microsoft.

Of course, it happens. You must record actions and re-draw on WM_PAINT (OnPaint in MFC)

If the painting actions are complex & cannot be recorded (like hand drawn shapes instead of lines, rectangles etc) You may draw into an offscreen memory DC (CDC::CreateCompatibleDC in MFC - imagine that as a bitmap) and draw it there. Later you can draw from that DC to screen using CDC->BitBlt on OnPaint

I''m not an MFC wizard, i''m used to the API. I suggest you go thru the msdn for more info on the classes

Store the points in a structure then using the points draw the shapes in OnPaint.

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