Generated by MFC single document template, in the view window draw some squares
1. The whole Draw_Rectangle function didn't assignment operators, why variable m_Width and m_Height becomes zero?
2. The drawing of the lattice graphics, such as how to stretches as the window than column change?
Thank you very much!

The code is as follows:
Add variables to the View class

 
Public: 
//than column factor 
Double m_Factor; 
//width 
Int m_Width; 
//height 
Int m_Height; 
Cx, void Draw_Rectangle (CDC * pDC, int int Cy, int m_Width2, int m_Height2); 

Ontouch function, assignment

 
Void CExampleView: : ontouch * pDC (CDC) 
{
CExampleDoc * pDoc=GetDocument (); 
ASSERT_VALID (pDoc); 
if (! PDoc) 
return; 

//TODO: here is the machine data add rendering code 
CRect m_Rect; 
GetClientRect (m_Rect); 

Double m_ViewHeight=m_Rect. Bottom - m_Rect. Top; 
M_Factor=m_ViewHeight/120000; 

M_Width=(int) (m_Width * m_Factor); 
M_Height=(int) (m_Height * m_Factor); 

Int Center_X=(int) (m_ViewHeight/2); 
Int Center_Y=(int) (m_ViewHeight/2); 

Draw_Rectangle (pDC, Center_X Center_Y m_Width, m_Height); 
} 

Function:

 
Void CExampleView: : Draw_Rectangle (CDC * pDC, Cx, int int Cy, int m_Width2, int m_Height2) 
{
Int LeftTop_X LeftTop_Y; 
For (int I=2; I & lt; 2; I++) 
{
For (int j=3; J<3; J++) 
{
LeftTop_X=Cx + I * m_Width2; 
LeftTop_Y=Cy + j * m_Height2; 
PDC - & gt; A Rectangle (LeftTop_X LeftTop_Y, LeftTop_X + m_Width2, LeftTop_Y + m_Height2); 
} 
} 

Cstrings STR. 
STR. The Format (L "% d, % d", m_Width2, m_Height2); 
MessageBox (STR, L "m_Width and m_Height"); 
} 

CodePudding user response:

Estimation is m_Factor force caused by integer
Why want to divided by 120000, it's too big

CodePudding user response:

To set breakpoints single-step debugging

CodePudding user response:

//width
Int m_Width;
//height
Int m_Height;
Uninitialized?

CodePudding user response:

Don't like the assignment

CodePudding user response:

Thank you for your attention!
Int m_Width and int m_Height; All initialization, in the constructor for the member variable assignment.

 
CExampleView: : CExampleView () 
: m_Factor (0) 
, m_Width (0) 
, m_Height (0) 
{
//TODO: add construction code here 
M_Height=7000; 
M_Width=5500; 
} 

CodePudding user response:

reference 1st floor yeah2000 response:

estimation is m_Factor force caused by integer
Why want to divided by 120000, it's too big.

Certainly not compulsory integer, divided by 120000, with a breakpoint debugging, can see, the m_Height=45 m_Width
=35?
With the two values in the client area draw rectangle is not small

Thank you, haven't solve, bother everybody to help!

CodePudding user response:

The presence of a variable is not much, you search, all add breakpoint debugging, see what has changed

CodePudding user response:

M_Width=(int) (m_Width * m_Factor);
7000 * 120000=840000000;
Not in the int

CodePudding user response:

The rectangle is no picture in the window?

CodePudding user response:

Normal, I debug, data is not shown,

CodePudding user response:

Thank you
As Iberia said, on both a breakpoint debugging and how to use monitoring, is no image display,

Graphics is in the client area, just don't know how the m_Width and value in the operation of the m_Height suddenly became a 0

In addition, m_Factor is a scaling factor between 0 ~ 1, m_Width=(int) (m_Width * m_Factor) must be within the scope of the int

Now I think of some way to avoid the hole, but still can't figure why is this so, welcome to discuss!

CodePudding user response:

GetClientRect (& amp; M_Rect);

CodePudding user response:

No problem!

 
Void CExampleView: : Draw_Rectangle (CDC * pDC, Cx, int int Cy, int m_Width2, int m_Height2) 
{
Int LeftTop_X LeftTop_Y; 
For (int I=2; I & lt; 2; I++) 
{
For (int j=3; J<3; J++) 
{
LeftTop_X=Cx + I * m_Width2; 
LeftTop_Y=Cy + j * m_Height2; 
PDC - & gt; A Rectangle (LeftTop_X LeftTop_Y, LeftTop_X + m_Width2, LeftTop_Y + m_Height2); 
} 
} 

Cstrings STR. 
STR. The Format (" % d, % d=m_Width=m_Height \ n ", m_Width2, m_Height2); 
AfxDump & lt; } 

Debugging code:
AfxDump & lt;
The MessageBox (STR, L "m_Width and m_Height"); Cover your picture!

CodePudding user response:

Find the problem!

 
Void CExampleView: : ontouch * pDC (CDC) 
{
CExampleDoc * pDoc=GetDocument (); 
ASSERT_VALID (pDoc); 
//TODO: add the draw code for native data here 
if (! PDoc) 
return; 

//TODO: here is the machine data add rendering code 
CRect m_Rect; 
GetClientRect (m_Rect); 

Double m_ViewHeight=m_Rect. Bottom - m_Rect. Top; 
M_Factor=m_ViewHeight/120000; 

//m_Height=7000; 
//m_Width=5500; 
# define WIN_HEIGHT 7000 
# define WIN_WIDTH 5500 
M_Width=(int) (WIN_WIDTH * m_Factor);//not m_Width * 
M_Height=(int) (WIN_HEIGHT * m_Factor);//not m_Height * 
//otherwise second redraw m_Height=0. 
Int Center_X=(int) (m_ViewHeight/2); 
Int Center_Y=(int) (m_ViewHeight/2); 

Draw_Rectangle (pDC, Center_X Center_Y m_Width, m_Height); nullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnull