pDC->SetWindowOrg();
pDC->SetViewportOrg();
pDC->SetWindowExt();
pDC->SetViewportExt();
这4个函数怎么用?请解释以下他们的作用是什么?
举例~
RECT rc;
this->GetClientRec(&rc);
这样就可以得到窗口的大小吗?没有初始化呀?
pDC->SetViewportOrg();
pDC->SetWindowExt();
pDC->SetViewportExt();
这4个函数怎么用?请解释以下他们的作用是什么?
举例~
RECT rc;
this->GetClientRec(&rc);
这样就可以得到窗口的大小吗?没有初始化呀?
后面的你没初始化但GetClientRect会把RECT结构中的各个无素填入适当的值无需初始化
int x,
int y
);
CPoint SetWindowOrg(
POINT point
);
Parameters
x
Specifies the logical x-coordinate of the new origin of the window.
y
Specifies the logical y-coordinate of the new origin of the window.
point
Specifies the logical coordinates of the new origin of the window. You can pass either a POINT structure or a CPoint object for this parameter.
Return Value
The previous origin of the window as a CPoint object.Res
The window, along with the device-context viewport, defines how GDI maps points in the logical coordinate system to points in the device coordinate system. The window origin s the point in the logical coordinate system from which GDI maps the viewport origin, a point in the device coordinate system specified by the SetWindowOrg function. GDI maps all other points by following the same process required to map the window origin to the viewport origin. For example, all points in a circle around the point at the window origin will be in a circle around the point at the viewport origin. Similarly, all points in a line that passes through the window origin will be in a line that passes through the viewport origin.具体见MSDN
pDC->SetWindowOrg(0,0);//把现在的(0,0)
pDC->SetViewportOr(x,y);//设到(x,y)
pDC->SetWindowExt();//设计宽和高
pDC->SetViewportExt();//到那里
pDC->SetViewportOr(x,y);//设到(x,y)
pDC->SetWindowExt();//设计宽和高
pDC->SetViewportExt();//到那里GetClientRect会把RECT结构中的各个无素填入适当的值无需初始化GetClientRect会把RECT结构中的各个无素填入适当的值无需初始化