Hola a todos:
Si le parece bien a Antonio podemos incluir la funci贸n
Degrada en fivewin.
Existe una funci贸n GradientFill en una dll del sistema pero no siempre esta disponible en todos los Windows asi que creo que es mejor utilizar esta forma
void GradientFill( HDC hDC, RECT* rct, COLORREF crStart, COLORREF crEnd, int bVertical )
{
int nSegments = 100;
COLORREF cr;
int nR = GetRValue(crStart);
int nG = GetGValue(crStart);
int nB = GetBValue(crStart);
int neB = GetBValue(crEnd);
int neG = GetGValue(crEnd);
int neR = GetRValue(crEnd);
int nDiffR = (neR - nR);
int nDiffG = (neG - nG);
int nDiffB = (neB - nB);
int ndR ;
int ndG ;
int ndB ;
int nCX ;
int nCY ;
int nTop = rct->top;
int nBottom = rct->bottom;
int nLeft = rct->left;
int nRight = rct->right;
HBRUSH hBrush;
RECT rc;
int i;
if( !bVertical )
{
if( nSegments > ( rct->right - rct->left ) )
{
nSegments = ( rct->right - rct->left );
}
}
else
{
if( nSegments > ( rct->bottom - rct->top ) )
{
nSegments = ( rct->bottom - rct->top );
}
}
ndR = 256 * (nDiffR) / (max(nSegments,1));
ndG = 256 * (nDiffG) / (max(nSegments,1));
ndB = 256 * (nDiffB) / (max(nSegments,1));
nCX = (rct->right-rct->left) / max(nSegments,1);
nCY = (rct->bottom-rct->top) / max(nSegments,1);
nR *= 256;
nG *= 256;
nB *= 256;
for (i = 0; i < nSegments; i++, nR += ndR, nG += ndG, nB += ndB)
{
if(i == (nSegments - 1))
{
nRight = rct->right;
nBottom = rct->bottom;
}
else
{
nBottom = nTop + nCY;
nRight = nLeft + nCX;
}
cr = RGB(nR / 256, nG / 256, nB / 256);
{
hBrush = CreateSolidBrush( cr );
if( bVertical )
{
rc.top = nTop;
rc.left = rct->left;
rc.bottom = nBottom + 1;
rc.right = rct->right;
}
else
{
rc.top = rct->top;
rc.left = nLeft;
rc.bottom = rct->bottom;
rc.right = nRight+1;
}
FillRect(hDC, &rc, hBrush );
DeleteObject( hBrush );
}
nLeft = nRight;
nTop = nBottom;
}
}
HB_FUNC( DEGRADA )
{
RECT rct;
rct.top = hb_parni( 2, 1 );
rct.left = hb_parni( 2, 2 );
rct.bottom = hb_parni( 2, 3 );
rct.right = hb_parni( 2, 4 );
GradientFill( ( HDC ) hb_parnl( 1 ) , &rct, hb_parnl( 3 ), hb_parnl( 4 ), hb_parl(5) );
}
local lVertical := .t.
Degrada( hDC, { 10, 10, 200, 200}, CLR_WHITE, CLR_BLUE, lVertical )
Este c贸digo est谩 inspirado en alguno que he visto por internet, no lo he imaginado yo solo.
Un saludo
Paco