VC 实现视图区背景颜色渐变填充

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void CSTest1View::OnDraw(CDC* pDC)

{

CSTest1Doc* pDoc = GetDocument();

ASSERT_VALID(pDoc);

// TODO: add draw code for native data here

CRect rcClient;

GetClientRect(&rcClient);

rcClient.DeflateRect(5,5,5,5);

if(m_nMode==0)

{

TRIVERTEX vert[2] ;

GRADIENT_RECT gRect;

vert [0] .x = rcClient.left;

vert [0] .y = rcClient.top;

vert [0] .Red = 0x8000;

vert [0] .Green = 0xc000;

vert [0] .Blue = 0xff00;

vert [0] .Alpha = 0x0000;

vert [1] .x = rcClient.right;

vert [1] .y = rcClient.bottom;

vert [1] .Red = 0xff00;

vert [1] .Green = 0xc000;

vert [1] .Blue = 0x8000;

vert [1] .Alpha = 0x0000;

gRect.UpperLeft = 1;

gRect.LowerRight = 0;

GradientFill(pDC->GetSafeHdc(),vert,2,&gRect,1,GRADIENT_FILL_RECT_V);

}

if(m_nMode==1)

{

TRIVERTEX vert [4] ;

GRADIENT_TRIANGLE gTri[2];

vert [0] .x = rcClient.left;

vert [0] .y = rcClient.top;

vert [0] .Red = 0xff00;

vert [0] .Green = 0xc000;

vert [0] .Blue = 0x8000;

vert [0] .Alpha = 0x0000;

vert [1] .x = rcClient.Width();

vert [1] .y = rcClient.top;

vert [1] .Red = 0x8000;

vert [1] .Green = 0xff00;

vert [1] .Blue = 0x8000;

vert [1] .Alpha = 0x0000;

vert [2] .x = rcClient.CenterPoint().x;

vert [2] .y = rcClient.bottom;

vert [2] .Red = 0x8000;

vert [2] .Green = 0xc000;

vert [2] .Blue = 0xff00;

vert [2] .Alpha = 0x0000;

vert [3] .x = rcClient.CenterPoint().x;

vert [3] .y = rcClient.CenterPoint().y;

vert [3] .Red = 0xff00;

vert [3] .Green = 0x0000;

vert [3] .Blue = 0x0000;

vert [3] .Alpha = 0x0000;

gTri[0].Vertex1 = 0;

gTri[0].Vertex2 = 1;

gTri[0].Vertex3 = 2;

gTri[1].Vertex1 = 0;

gTri[1].Vertex2 = 0;

gTri[1].Vertex3 = 0;

GradientFill(pDC->GetSafeHdc(),vert,4,&gTri,1,GRADIENT_FILL_TRIANGLE);

}

}