(4) develop a simple CAD circle and rectangle step by step

(1) The Circle parameter, the center of the circle and the point above the circle, that is, the two parameters can draw a circle

As follows:

 

Class ccreateline: Public ccomand
{
Public:
Ccreateline ();
Virtual ~ Ccreateline ();
Public:

Void onlbuttondown (uint nflags, cposition POS );
Void onmousemove (uint nflags, cposition POS );
Void onrbuttondown (uint nflags, cposition POS );

 
PRIVATE:
Cposition m_begin;
Cposition m_end;
Ceraseline m_erase_line; // draw a rubber band

};

 

 

Ccreatecircle: ccreatecircle ()
{
M_nstep = 1;
C_refresh = g_refresh;

}

Ccreatecircle ::~ Ccreatecircle ()
{

}

Void ccreatecircle: onlbuttondown (uint nflags, cposition POS)
{

Switch (m_nstep)
{

Case 1: // output prompt information
{
M_erase_line.setbegin (POS );//////

Cposition center = Pos;
// G_pdoc-> drawflag (true, POs, & center); // draw a flag
M_end = m_begin = center;

M_nstep ++;
Break;

}

Case 2:
{
M_erase_line.setbegin (POS );

CDC * PDC = g_pview-> getdc ();
cposition center2 = Pos;
// g_pdoc-> drawflag (true, POs, & center2 ); // draw the mark
ccircle * ccircel1 = new ccircle (m_begin, center2);
g_pdoc-> m_solid.add (ccircel1 );
m_nstep = 1; // reset
g_pview-> releasedc (PDC);
break;

}< br> default:
break;
}< br>
}

void ccreatecircle: onmousemove (uint nflags, cposition POS)
{< br> cposition center2;
// g_pdoc-> drawflag (true, POs, & center2);
switch (m_nstep)
{< br> case 2:
m_erase_line.setend (POS);
If (c_refresh! = G_refresh)
{< br> m_end = m_begin;
c_refresh = g_refresh;
}< br> CDC * PDC = g_pview-> getdc ();

Ccircle * ccircel1 = new ccircle (m_begin, m_end );
Ccircel1-> drawsolid (PDC, drag );
Delete ccircel1;

Ccircle * ccircel2 = new ccircle (m_begin, POS); // portrait leather Line, Last
Ccircel2-> drawsolid (PDC, normal );
Delete ccircel2;

M_end = Pos;
 

G_pview-> releasedc (PDC );
 
Break;
}
}

Void ccreatecircle: onrbuttondown (uint nflags, cposition POS)
{
CDC * PDC = g_pview-> getdc ();

Ccircle * ccircel2 = new ccircle (m_begin, POS); // portrait leather Line, Last
Ccircel2-> drawsolid (PDC, back );
Delete ccircel2;

G_pview-> releasedc (PDC );

M_nstep = 1;
}

 

(2) Draw a rectangle. The upper left corner and the lower right corner of the circle can be determined by two parameters.

The following command is used to draw a circle:

 

Class ccreaterect: Public ccomand
{
Public:
Ccreaterect ();
Virtual ~ Ccreaterect ();
Public:
Void onlbuttondown (uint nflags, cposition POS );
Void onmousemove (uint nflags, cposition POS );
Void onrbuttondown (uint nflags, cposition POS );
PRIVATE:
Cposition m_begin;
Cposition m_end;

};

 

Ccreaterect: ccreaterect ()
{
M_nstep = 1;
C_refresh = g_refresh;

}

Ccreaterect ::~ Ccreaterect ()
{

}

Void ccreaterect: onlbuttondown (uint nflags, cposition POS)
{

Switch (m_nstep)
{

Case 1: // output prompt information
{

Cposition center = Pos;
// G_pdoc-> drawflag (true, POs, & center); // draw a flag
M_end = m_begin = center;

m_nstep ++;
break;

}< br>
case 2:
{< br> CDC * PDC = g_pview-> getdc ();
cposition center2 = Pos;
// g_pdoc-> drawflag (true, POs, & center2); // draw the mark
ccrect * ccircel1 = new ccrect (m_begin, m_end);
g_pdoc-> m_solid.add (ccircel1 );
m_nstep = 1; // reset
g_pview-> releasedc (PDC);
break;

}< br> default:
break;
}< br>
}

Void ccreaterect: onmousemove (uint nflags, cposition POS)
{

Switch (m_nstep)
{
Case 2:

If (c_refresh! = G_refresh)
{
M_end = m_begin;
C_refresh = g_refresh;
}
CDC * PDC = g_pview-> getdc ();

Ccrect * ccircel1 = new ccrect (m_begin, m_end );
Ccircel1-> drawsolid (PDC, drag );
Delete ccircel1;

Ccrect * ccircel2 = new ccrect (m_begin, POS); // portrait leather Line, Last
Ccircel2-> drawsolid (PDC, normal );
Delete ccircel2;

M_end = Pos;
 

G_pview-> releasedc (PDC );
 
Break;
}
}

Void ccreaterect: onrbuttondown (uint nflags, cposition POS)
{
CDC * PDC = g_pview-> getdc ();

Ccrect * ccircel2 = new ccrect (m_begin, POS); // portrait leather Line, Last
Ccircel2-> drawsolid (PDC, back );
Delete ccircel2;

G_pview-> releasedc (PDC );

M_nstep = 1;
}