다이렉트 X에서 MatrixStack에 대한 설명이다.

코드를 짜놓고 시간이 지나면 설명을 어떻게 해야 기억이 안난다.

배 이동을 10장의 MoveShip과 비교해 보면 쉽게 이해 갈것이다.

리스트 - 1   일반 매트릭스를 사용한 배 이동
void MoveShip(float fx, float fy) { D3DXMATRIX mScale1, mRot1, mTran1, mResult1; D3DXMATRIX mScale2, mRot2, mTran2, mResult2; D3DXMATRIX mScale3, mRot3, mTran3, mResult3; //본체 //SRT D3DXMatrixScaling( &mScale1, 1.1f, 1.1f, 1.1f ); D3DXMatrixRotationZ(&mRot1, D3DXToRadian(g_fDegree)); D3DXMatrixTranslation( &mTran1, fx, fy, 0.0f); mResult1 = mScale1 * mRot1 * mTran1; g_d3d_Device->SetTransform( D3DTS_WORLD, &mResult1); g_d3d_Device->DrawPrimitive( D3DPT_TRIANGLESTRIP, 3, 2 ); //포탑 D3DXMatrixScaling( &mScale2, 1.0f, 1.0f, 1.0f ); D3DXMatrixRotationZ(&mRot2, D3DXToRadian(g_fTurretDegree)); D3DXMatrixTranslation( &mTran2, 0.0f, -0.7f, 0.0f ); mResult2 = mScale2 * mRot2 * mTran2 * mResult1; g_d3d_Device->SetTransform( D3DTS_WORLD, &mResult2 ); g_d3d_Device->DrawPrimitive( D3DPT_TRIANGLELIST, 0, 1 ); //포 D3DXMatrixScaling( &mScale3, 0.1f, 0.3f, 1.0f ); D3DXMatrixRotationZ(&mRot3, 0.0f); D3DXMatrixTranslation( &mTran3, 0.0f, -0.1f, -0.5f); mResult3 = mScale3 * mRot3 * mTran3 * mResult2; g_d3d_Device->SetTransform( D3DTS_WORLD, &mResult3 ); g_d3d_Device->DrawPrimitive( D3DPT_TRIANGLESTRIP, 3, 2 ); }

리스트 - 2  MatrixStack을 사용한 배 이동.
void MoveShip(float fx, float fy) { D3DXVECTOR3 ZAXIS( 0.0f, 0.0f, 1.0f) ; ID3DXMatrixStack* ppStack; D3DXCreateMatrixStack(0, &ppStack); ppStack->Push(); //본체 //SRT //mResult1 = mScale1 * mRot1 * mTran1; ppStack->TranslateLocal(fx, fy, 1.1f); ppStack->RotateAxisLocal(&ZAXIS, D3DXToRadian(g_fDegree)); ppStack->ScaleLocal(1.1f, 1.1f, 1.1f); g_d3d_Device->SetTransform( D3DTS_WORLD, ppStack->GetTop()); g_d3d_Device->DrawPrimitive( D3DPT_TRIANGLESTRIP, 3, 2 ); //포탑 //mResult2 = mScale2 * mRot2 * mTran2 * mResult1; ppStack->TranslateLocal(0.0f, -0.7f, 0.0f); ppStack->RotateAxisLocal(&ZAXIS, D3DXToRadian(g_fTurretDegree)); ppStack->ScaleLocal(1.1f, 1.1f, 1.1f); g_d3d_Device->SetTransform( D3DTS_WORLD, ppStack->GetTop()); g_d3d_Device->DrawPrimitive( D3DPT_TRIANGLELIST, 0, 1 ); //포 //mResult3 = mScale3 * mRot3 * mTran3 * mResult2; ppStack->TranslateLocal(0.0f, -0.1f, -0.5f); ppStack->RotateAxisLocal(&ZAXIS, 0.0f); ppStack->ScaleLocal(0.1f, 0.3f, 1.0f); g_d3d_Device->SetTransform( D3DTS_WORLD, ppStack->GetTop() ); g_d3d_Device->DrawPrimitive( D3DPT_TRIANGLESTRIP, 3, 2 ); if ( ppStack != NULL ) ppStack->Release(); }