void
JXColorWheel::SetColor
(
const JPoint& pt
)
{
if (itsImage == NULL)
{
Redraw();
}
const JRect bounds = GetBoundsGlobal();
const JCoordinate max = JMin(bounds.height(), bounds.width() - kSliderWidth - kSliderMargin);
const JCoordinate size = max - 2*kWheelMargin - 1;
const JCoordinate center = size/2 + kWheelMargin;
const JCoordinate dx = - pt.x + center;
const JCoordinate dy = pt.y - center;
const JFloat r = JMin(sqrt(dx*dx + dy*dy) / center, 1.0);
const JFloat a = 0.5 + atan2(dy, dx) / (2.0 * kJPi);
const JSize b = JRound(itsBrightnessSlider->GetValue());
SetColor(JHSB(JRound(a * kJMaxHSBValue), JRound(r * kJMaxHSBValue), b));
}
void
JXWidget::ShouldAllowUnboundedScrolling
(
const JBoolean allow
)
{
itsAllowUnboundedScrollingFlag = allow;
if (!allow)
{
const JRect apG = GetApertureGlobal();
const JRect bG = GetBoundsGlobal();
if (apG.top < bG.top || apG.left < bG.left)
{
ScrollTo(JMax(0L, apG.left - bG.left),
JMax(0L, apG.top - bG.top));
}
}
}
void
JXColorWheel::Draw
(
JXWindowPainter& p,
const JRect& rect
)
{
JXColormap* colormap = GetColormap();
const JColorIndex black = colormap->GetBlackColor();
const JRect bounds = GetBoundsGlobal();
const JCoordinate max = JMin(bounds.height(), bounds.width() - kSliderWidth - kSliderMargin);
const JCoordinate size = max - 2*kWheelMargin - 1;
const JCoordinate center = size/2 + kWheelMargin;
if (itsImage == NULL || itsImage->GetWidth() != max || itsColor.brightness != itsLastDrawBrightness)
{
p.SetFilling(kJTrue);
p.SetPenColor(black);
p.Ellipse(kWheelMargin, kWheelMargin, size, size);
p.SetFilling(kJFalse);
JRect r = bounds;
r.bottom = r.top + max;
r.right = r.left + max;
jdelete itsImage;
itsImage = jnew JXImage(GetDisplay(), p.GetDrawable(), r);
assert( itsImage != NULL );
itsLastDrawBrightness = itsColor.brightness;
for (JCoordinate x=0; x<max; x++)
{
const JCoordinate dx = - x + center;
for (JCoordinate y=0; y<max; y++)
{
if (itsImage->GetColor(x,y) == black)
{
const JCoordinate dy = y - center;
const JFloat r = sqrt(dx*dx + dy*dy) / center;
const JFloat a = 0.5 + atan2(dy, dx) / (2.0 * kJPi);
JHSB color(JRound(a * kJMaxHSBValue), JRound(r * kJMaxHSBValue), itsLastDrawBrightness);
itsImage->SetColor(x,y, colormap->JColormap::GetColor(color));
}
}
}
itsImage->ConvertToRemoteStorage();
}
p.JPainter::Image(*itsImage, itsImage->GetBounds(), 0,0);
const JFloat r = (itsColor.saturation / kJMaxHSBValueF) * size/2;
const JFloat a = ((itsColor.hue / kJMaxHSBValueF) - 0.5) * 2.0 * kJPi;
const JCoordinate x = center - JRound(r * cos(a));
const JCoordinate y = center + JRound(r * sin(a));
JRect mark(y-kWheelMargin, x-kWheelMargin, y+kWheelMargin+1, x+kWheelMargin+1);
p.SetPenColor(colormap->GetWhiteColor());
p.SetFilling(kJTrue);
p.JPainter::Rect(mark);
p.SetFilling(kJFalse);
p.SetPenColor(black);
p.JPainter::Rect(mark);
}
