Because the project used in shape is more, although as a rectangle, round area of these shapes algorithm is simpler, but if each shape with the programmer to write algorithms, too much trouble, could not all written,
Only with area with the general integral algorithm, but how to through the incoming polygon area by using integral?

CodePudding user response:

The realization of the reference source OpenCV projects cvContourArea function,

CodePudding user response:

https://blog.csdn.net/langmanqishizaijia/article/details/51097364

CodePudding user response:

Shoelaces by formula are available, and the specific reference: https://blog.csdn.net/yang_deyuan/article/details/78863424

CodePudding user response:

We are made of numerical integration method, all the parameters of the curve can be used,

CodePudding user response:

 
Void CFillTudouDlg: : OnButton1 () 
{
//TODO: Add your the control notification handler code here 
BOOL start=FALSE; 
Int the end=0; 
The CDC * pDC=m_Pic. GetDC (); 
CRect rc; 
M_Pic. GetClientRect (rc); 
CRgn allRgn tmpRgn; 
AllRgn. CreateRectRgn (0,0,0,0); 
//
For (int y=0; Y & lt; Rc. Height (); Y++) 
{
For (int x=0; X & lt; Rc. Width (); X++) 
{
COLORREF col=pDC - & gt; GetPixel (x, y); 
if((! Start) & amp; & (col==RGB (0, 0))) 
{//once a line 
Start=TRUE; 
//find the end 
Int e=x; 
Int repeat=x; 
//the skip the as many as black points 
While ((pDC - & gt; GetPixel (e, y)==RGB (0, 0)) & amp; & (e & lt; Rc. Width ())) 
{
E++; 
Repeat++; 
} 
//search end 
While ((pDC - & gt; GetPixel (e, y)!=RGB (0, 0)) & amp; & (e & lt; Rc. Width ())) 
{
E++; 
} 
//if after the end, still black points 
While ((pDC - & gt; GetPixel (e, y)==RGB (0, 0)) & amp; & (e & lt; Rc. Width ())) 
{
E++; 
} 
//check valid x 
If (e==rc. Width ()) 
{//not found 
End=repeat; 
} 
The else 
{//found 
End=e; 
} 
}//end the if ((! Start) & amp; & (col==RGB (0, 0))) 
//add RGN 
If (start & amp; & (x & lt; End)) 
{
If # 1//not use RGN 
PDC - & gt; SetPixel (x, y, RGB (0, 255)); 
# the else 
TmpRgn. CreateRectRgn (x, y, x + 1, y + 1); 
AllRgn.Com bineRgn (& amp; AllRgn, & amp; TmpRgn RGN_OR); 
TmpRgn. DeleteObject (); 
# endif 
} 
}//end for x 
//reset flag 
Start=FALSE; 
}//end for y 
# if 0 
//the draw RGN 
The CBrush br; 
Br. CreateSolidBrush (RGB (0, 255)); 
PDC - & gt; FillRgn (& amp; AllRgn, & amp; Br); 
The ReleaseDC (pDC); 
# endif 
} 

Record the pDC - & gt; SetPixel (x, y, RGB (0, 255)); The point is the area