我在画sin（）函数，如何将座标设置在clentRect的中央啊？

Question

我在画y=sin（）函数图像，如何将座标设置在clentRect的中央啊？

Answer 1

CRect rect;
GetClientRect(&rect);
dc.SetMapMode(MM_ANISOTROPIC); //设置不同比例的坐标系
dc.SetViewportOrg(rect.left,rect.bottom); //坐标原点 右下脚
dc.SetViewportExt(rect.right,rect.bottom); //视窗浣范围
dc.SetWindowOrg(0,0);
dc.SetWindowExt(rect.right,-rect.bottom);

Answer 2

dc.SetViewportOrg(rect.left,rect.bottom);
--->
dc.SetViewportOrg(rect.Width()/2,rect.Height()/2);

Answer 3

还不行啊！我的代码如下：
CClientDC dc(this); // device context for painting
CRect rect;
double y;
int x;
GetClientRect(&rect);
dc.MoveTo(0,rect.Height() / 2);
dc.LineTo (rect.Width(),rect.Height() / 2); dc.MoveTo(rect.Width()/2,0);
dc.LineTo (rect.Width()/2,rect.Height()); dc.SetTextColor(RGB(0,0,255)); ClientToScreen(&rect); for (x=1;x<rect.Width()-10;)
{
y=sin(x);
dc.TextOut (x,y+rect.Height() / 2,"*");
x=x+10;
         』

Answer 4

CRect rect;
GetClientRect(&rect);
dc.SetMapMode(MM_ANISOTROPIC);//设置不同比例的坐标系
dc.SetViewportOrg(rect.Width()/2,rect.Height()/2);//坐标原点 
dc.SetViewportExt(rect.right,rect.bottom);//视窗浣范围
dc.SetWindowOrg(0,0);
dc.SetWindowExt(rect.right,-rect.bottom);dc.MoveTo(0,0);
dc.LineTo(100,100);//看看效果

Answer 5

//接上上楼
CClientDC dc(this); // device context for painting
CRect rect;
GetClientRect(&rect);
dc.SetMapMode(MM_ANISOTROPIC);//设置不同比例的坐标系
dc.SetViewportOrg(rect.Width()/2,rect.Height()/2);//坐标原点 
dc.SetViewportExt(rect.right,rect.bottom);//视窗浣范围
dc.SetWindowOrg(0,0);
dc.SetWindowExt(rect.right,-rect.bottom);dc.MoveTo(-rect.right / 2,0);
dc.LineTo(rect.right / 2,0);
dc.MoveTo(0,-rect.bottom / 2);
dc.LineTo(0,rect.bottom / 2);double pi = 3.1415;
double rate = rect.Width() / (2 * pi);
for(double i = - pi; i < pi; i += 0.1)
{
if(i == -pi)
dc.MoveTo(i * rate,sin(i) * rate);
else
dc.LineTo(i * rate,sin(i) * rate);
}