void ScrollbarThemeOpus::paintThumb(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect)
{
if (!clientOpacityMap->contains(scrollbar))
return;
int opacity = clientOpacityMap->get(scrollbar);
if (!opacity)
return;
IntRect thumbRect = rect;
thumbRect.inflate(-1);
int scrollThickness = thumbRect.width() < thumbRect.height() ? thumbRect.width() : thumbRect.height();
IntSize curveSize(scrollThickness / 2, scrollThickness / 2);
Color fillColor(makeRGBA(128, 128, 128, opacity));
context->fillRoundedRect(thumbRect, curveSize, curveSize, curveSize, curveSize, fillColor, ColorSpaceDeviceRGB);
}
void curvePoints(S_Curve *pCurve, int n, S_CoordVec *pPoints)
{
double step, t = 0.0;
int i, size;
IZG_ASSERT(pCurve && pPoints);
/* uprava velikosti vysledneho seznamu bodu */
size = curveSize(pCurve);
cvecResize(pPoints, size);
/* pocet ridicich bodu */
if( size < 2 || n < 2 ) return;
/* vypocet velikosti kroku */
step = 1.0 / (n - 1);
/* generovani bodu */
for( i = 0; i < n; ++i, t += step )
{
/* vypocet bodu krivky */
cvecGet(pPoints, i) = curvePoint(pCurve, t);
}
}
S_Coords curvePoint(S_Curve *pCurve, double t)
{
S_Coords point = makeCoords(0.0, 0.0, 0.0);
double A, denom = 0.0;
int i, size;
IZG_ASSERT(pCurve);
/* velikost krivky */
size = curveSize(pCurve);
/* kontrola hodnoty parametru t <0, 1> */
if( t < 0.0 ) t = 0.0;
else if( t >= 1.0 ) t = 1.0;
/* vypocet bodu krivky pomoci Bernsteinovych polynomu */
for( i = 0; i < size; ++i )
{
A = dvecGet(pCurve->weights, i) * splineFunc(i, pCurve->degree, pCurve->knots, t);
point.x += cvecGet(pCurve->points, i).x * A;
point.y += cvecGet(pCurve->points, i).y * A;
point.z += cvecGet(pCurve->points, i).z * A;
denom += A;
}
/* podeleni jmenovatelem */
if( !IS_ZERO(denom) )
{
denom = 1.0 / denom;
}
point.x *= denom;
point.y *= denom;
point.z *= denom;
return point;
}
