六.绘制准备工作

为绘制流水线提供数据

Device->SetStreamSource(0, Triangle, 0, sizeof(Vertex));
Device->SetFVF(Vertex::FVF);

七.绘制图形

bool Display(float timeDelta)
{
    if( Device )
    {
        Device->Clear(0, 0, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 0xffffffff, 1.0f, 0);
        Device->BeginScene();

        Device->SetStreamSource(0, Triangle, 0, sizeof(Vertex));
        Device->SetFVF(Vertex::FVF);

        // Draw one triangle.
        Device->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);

        Device->EndScene();
        Device->Present(0, 0, 0, 0);
    }
    return true;
}

1.Clear方法清除病设置背景
2.在绘制图形前后调用BeginScene和EndScene方法
3.使用DrawPrimitive和DrawIndexedPrimitive方法根据顶点坐标绘制图形

3.1DrawPrimitive

3.2DrawIndexedPrimitive

以上便创建了一个简单的三角形

八.绘制一个立方体

1.准备顶点坐标和索引坐标

//
// Fill the buffers with the cube data.
//

// define unique vertices:
Vertex* vertices;
VB->Lock(0, 0, (void**)&vertices, 0);

// vertices of a unit cube
vertices[0] = Vertex(-1.0f, -1.0f, -1.0f);
vertices[1] = Vertex(-1.0f,  1.0f, -1.0f);
vertices[2] = Vertex( 1.0f,  1.0f, -1.0f);
vertices[3] = Vertex( 1.0f, -1.0f, -1.0f);
vertices[4] = Vertex(-1.0f, -1.0f,  1.0f);
vertices[5] = Vertex(-1.0f,  1.0f,  1.0f);
vertices[6] = Vertex( 1.0f,  1.0f,  1.0f);
vertices[7] = Vertex( 1.0f, -1.0f,  1.0f);

VB->Unlock();

// define the triangles of the cube:
WORD* indices = 0;
IB->Lock(0, 0, (void**)&indices, 0);

// front side
indices[0]  = 0; indices[1]  = 1; indices[2]  = 2;
indices[3]  = 0; indices[4]  = 2; indices[5]  = 3;

// back side
indices[6]  = 4; indices[7]  = 6; indices[8]  = 5;
indices[9]  = 4; indices[10] = 7; indices[11] = 6;

// left side
indices[12] = 4; indices[13] = 5; indices[14] = 1;
indices[15] = 4; indices[16] = 1; indices[17] = 0;

// right side
indices[18] = 3; indices[19] = 2; indices[20] = 6;
indices[21] = 3; indices[22] = 6; indices[23] = 7;

// top
indices[24] = 1; indices[25] = 5; indices[26] = 6;
indices[27] = 1; indices[28] = 6; indices[29] = 2;

// bottom
indices[30] = 4; indices[31] = 0; indices[32] = 3;
indices[33] = 4; indices[34] = 3; indices[35] = 7;

IB->Unlock();

2.绘制图形

//
// draw the scene:
//
Device->Clear(0, 0, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 0xffffffff, 1.0f, 0);
Device->BeginScene();

Device->SetStreamSource(0, VB, 0, sizeof(Vertex));
Device->SetIndices(IB);
Device->SetFVF(Vertex::FVF);

// Draw cube.
Device->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, 8, 0, 12);

Device->EndScene();
Device->Present(0, 0, 0, 0);

九.内置图形

其会返回一个ID3DXMesh接口,调用其DrawSubset方法来绘制图形