As two figures above, change the size of the circle, the icon is covered, how to change circle size appears only a circle, icon will not be covered again??
(probably is this meaning, forgive me,

CodePudding user response:

Put all drawing operations in ontouch,

CodePudding user response:

Double buffer drawing good memory draw on interface drawing operations inside the OnPaint completed

CodePudding user response:

Before the Ellipse selected to an empty brush or a background color of the brush

 
Void CSDI2View: : ontouch * pDC (CDC) 
{
CSDI2Doc * pDoc=GetDocument (); 
ASSERT_VALID (pDoc); 
//TODO: add the draw code for native data here 

Int nSaveDC=pDC - & gt; SaveDC (); 

//the background transparent 
Int nBkMode=pDC - & gt; SetBkMode (TRANSPARENT); 

//set the font color 
COLORREF txColorSave=pDC - & gt; SetTextColor (RGB (255, 0, 0)); 

//create & amp; Elected to the font 
CFont mFont; 
MFont. CreatePointFont (240, _T (" Arial ")); 
CFont * pOldFont=pDC - & gt; SelectObject (& amp; MFont); 

Cstrings sText=_T (" Test the Ellipse "); 
PDC - & gt; TextOut (10, 10, sText); 


//for air brush 
The CBrush * pOldBrush=(CBrush *) pDC - & gt; SelectStockObject (NULL_BRUSH); 

//elected to brush 
CPen pen (PS_SOLID, 1, RGB (0, 0, 255)); 
CPen * pOldPen=pDC - & gt; SelectObject (& amp; Pen); 

PDC - & gt; The Ellipse (0, 0, 100, 100); 

//restore brush 
PDC - & gt; SelectObject (pOldPen); 

//restore brush 
PDC - & gt; SelectObject (pOldBrush); 

//resume font 
PDC - & gt; SelectObject (pOldFont); 

//resume font color 
PDC - & gt; SetTextColor (txColorSave); 

//recovery background model 
PDC - & gt; SetBkMode (nBkMode); 

PDC - & gt; RestoreDC (nSaveDC); 

}