Shulou(Shulou.com)06/02 Report--

description

When using DC for graphics rendering process, there will be flickering problem, mainly graphics are rendered in real time, if rendering in a piece of memory first, and then rendering is completed, only one-time mapping to the screen, you can avoid flickering problem. Therefore wxBuffered PaintDC is introduced. wxBufferedPaintDC inherits from wxBufferedDC, wxPaintDC is its private member variable, so this class can only be used in wxPaintEvent events, that is, only in OnPaint( wxPaintEvent& event ) functions.

In order to use this class, you need to include the header file #include "wx/dcbuffer.h", which is not currently included in the wx/wx.h file. You can add it directly to avoid every handwriting.

example

#include "wx/dcbuffer.h"

void CDownLinkPlaybackSliderCtrl::OnPaint( wxPaintEvent& event )

{

wxBufferedPaintDC dc(this);

dc.SetBrush(*wxWHITE_BRUSH);

dc.Clear();

wxSize size = this->GetSize();

int width = size.GetWidth();

int height = size.GetHeight();

int middleHeight = height/2;

dc.SetPen(wxPen(*wxBLACK, 2));

// dc.DrawLine(0, middleHeight-1, width, middleHeight-1);

// dc.DrawLine(0, middleHeight+1, width, middleHeight+1);

dc.SetBrush(*wxBLACK_BRUSH);

dc.DrawRectangle(2, middleHeight-2, width-4, 4);

int topDialHeight = middleHeight-2;

int buttonDialHeight = middleHeight+2;

int averageGap = (width-4)/25;

int count = 0;

for (int i=2; i

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