[Coding] Draw with DrawPrimitive

[SystemFiles]

Hi hackers here are my functions to draw with DrawPrimitive:

Somewhere in your initialize function:

if( FAILED( pDevice->CreateVertexBuffer( 31 * sizeof( CVertexList ), D3DUSAGE_WRITEONLY | D3DUSAGE_DYNAMIC, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &pVertexBuffer, NULL ) ) )
{
	return E_FAIL;
}

The functions:

HRESULT CDraw::DrawRect( LPDIRECT3DDEVICE9 pDevice, FLOAT X, FLOAT Y, FLOAT Width, FLOAT Height, D3DCOLOR dColor )
{
	CVertexList* pVertexList;

	pVertexBuffer->Lock( 0, 0, ( PVOID* )&pVertexList, D3DLOCK_NOSYSLOCK | D3DLOCK_DISCARD );

	pVertexList[0].X = X;
	pVertexList[0].Y = Y + Height;
	pVertexList[0].Z = 0.0f;
	pVertexList[0].RHW = 0.0f;
	pVertexList[0].dColor = dColor;

	pVertexList[1].X = X;
	pVertexList[1].Y = Y;
	pVertexList[1].Z = 0.0f;
	pVertexList[1].RHW = 0.0f;
	pVertexList[1].dColor = dColor;

	pVertexList[2].X = X + Width;
	pVertexList[2].Y = Y + Height;
	pVertexList[2].Z = 0.0f;
	pVertexList[2].RHW = 0.0f;
	pVertexList[2].dColor = dColor;

	pVertexList[3].X = X + Width;
	pVertexList[3].Y = Y;
	pVertexList[3].Z = 0.0f;
	pVertexList[3].RHW = 0.0f;
	pVertexList[3].dColor = dColor;

	pVertexBuffer->Unlock( );

	pDevice->SetTexture( 0, NULL );
	pDevice->SetStreamSource( 0, pVertexBuffer, 0, sizeof( CVertexList ) );
	pDevice->SetFVF( D3DFVF_CUSTOMVERTEX );

	return pDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 0, 2 );
}

HRESULT CDraw::DrawCircle( LPDIRECT3DDEVICE9 pDevice, FLOAT X, FLOAT Y, FLOAT RadiusW, FLOAT RadiusH, D3DCOLOR dColor )
{
	CONST INT NUMPOINTS = 30;
	CONST FLOAT Angle = ( 2.0f * D3DX_PI ) / NUMPOINTS;

	CVertexList* pVertexList;

	pVertexBuffer->Lock( 0, 0, ( PVOID* )&pVertexList, D3DLOCK_NOSYSLOCK | D3DLOCK_DISCARD );

	for( INT i = 0; i <= NUMPOINTS; i++ )
	{
		FLOAT CurAngle = ( FLOAT )i * Angle;
		FLOAT DrawPosX = ( X + RadiusW * cos( CurAngle ) );
		FLOAT DrawPosY = ( Y - RadiusH * sin( CurAngle ) );
		
		pVertexList[i].X = DrawPosX;
		pVertexList[i].Y = DrawPosY;
		pVertexList[i].Z = 0.0f;
		pVertexList[i].RHW = 0.0f;
		pVertexList[i].dColor = dColor;
	}

	pVertexBuffer->Unlock( );

	pDevice->SetTexture( 0, NULL );
	pDevice->SetStreamSource( 0, pVertexBuffer, 0, sizeof( CVertexList ) );
	pDevice->SetFVF( D3DFVF_CUSTOMVERTEX );

	return pDevice->DrawPrimitive( D3DPT_LINESTRIP, 0, NUMPOINTS );
}

HRESULT CDraw::DrawLine( LPDIRECT3DDEVICE9 pDevice, FLOAT X, FLOAT Y, FLOAT X2, FLOAT Y2, D3DCOLOR dColor )
{
	CVertexList* pVertexList;

	pVertexBuffer->Lock( 0, 0, ( PVOID* )&pVertexList, D3DLOCK_NOSYSLOCK | D3DLOCK_DISCARD );

	pVertexList[0].X = X;
	pVertexList[0].Y = Y;
	pVertexList[0].Z = 0.0f;
	pVertexList[0].RHW = 0.0f;
	pVertexList[0].dColor = dColor;

	pVertexList[1].X = X2;
	pVertexList[1].Y = Y2;
	pVertexList[1].Z = 0.0f;
	pVertexList[1].RHW = 0.0f;
	pVertexList[1].dColor = dColor;

	pVertexBuffer->Unlock( );

	pDevice->SetTexture( 0, NULL );
	pDevice->SetStreamSource( 0, pVertexBuffer, 0, sizeof( CVertexList ) );
	pDevice->SetFVF( D3DFVF_CUSTOMVERTEX );

	return pDevice->DrawPrimitive( D3DPT_LINELIST, 0, 1 );
} 

HRESULT CDraw::DrawGradientRect( LPDIRECT3DDEVICE9 pDevice, FLOAT X, FLOAT Y, FLOAT Width, FLOAT Height, D3DCOLOR dColor1, D3DCOLOR dColor2 )
{
	CVertexList* pVertexList;

	pVertexBuffer->Lock( 0, 0, ( PVOID* )&pVertexList, D3DLOCK_NOSYSLOCK | D3DLOCK_DISCARD );

	pVertexList[0].X = X;
	pVertexList[0].Y = Y + Height;
	pVertexList[0].Z = 0.0f;
	pVertexList[0].RHW = 0.0f;
	pVertexList[0].dColor = dColor2;

	pVertexList[1].X = X;
	pVertexList[1].Y = Y;
	pVertexList[1].Z = 0.0f;
	pVertexList[1].RHW = 0.0f;
	pVertexList[1].dColor = dColor1;

	pVertexList[2].X = X + Width;
	pVertexList[2].Y = Y + Height;
	pVertexList[2].Z = 0.0f;
	pVertexList[2].RHW = 0.0f;
	pVertexList[2].dColor = dColor2;

	pVertexList[3].X = X + Width;
	pVertexList[3].Y = Y;
	pVertexList[3].Z = 0.0f;
	pVertexList[3].RHW = 0.0f;
	pVertexList[3].dColor = dColor1;

	pVertexBuffer->Unlock( );

	pDevice->SetTexture( 0, NULL );
	pDevice->SetStreamSource( 0, pVertexBuffer, 0, sizeof( CVertexList ) );
	pDevice->SetFVF( D3DFVF_CUSTOMVERTEX );

	return pDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 0, 2 );
}

HRESULT CDraw::DrawGradientLine( LPDIRECT3DDEVICE9 pDevice, FLOAT X, FLOAT Y, FLOAT X2, FLOAT Y2, D3DCOLOR dColor1, D3DCOLOR dColor2 )
{
	CVertexList* pVertexList;

	pVertexBuffer->Lock( 0, 0, ( PVOID* )&pVertexList, D3DLOCK_NOSYSLOCK | D3DLOCK_DISCARD );

	pVertexList[0].X = X;
	pVertexList[0].Y = Y;
	pVertexList[0].Z = 0.0f;
	pVertexList[0].RHW = 0.0f;
	pVertexList[0].dColor = dColor1;

	pVertexList[1].X = X2;
	pVertexList[1].Y = Y2;
	pVertexList[1].Z = 0.0f;
	pVertexList[1].RHW = 0.0f;
	pVertexList[1].dColor = dColor2;

	pVertexBuffer->Unlock( );

	pDevice->SetTexture( 0, NULL );
	pDevice->SetStreamSource( 0, pVertexBuffer, 0, sizeof( CVertexList ) );
	pDevice->SetFVF( D3DFVF_CUSTOMVERTEX );

	return pDevice->DrawPrimitive( D3DPT_LINELIST, 0, 1 );
}

Credits: Me, Toymaker.info