Method paintEvent

Gui/QtColorTriangle.cpp:531–594

! \reimp First copies a background image of the hue donut and its background color onto the frame, then draws the color triangle, and finally the selectors. */

    and finally the selectors.
*/
void QtColorTriangle::paintEvent(QPaintEvent *e)
{
    QPainter p(this);
    if (e->rect().intersects(contentsRect()))
		p.setClipRegion(e->region().intersected(contentsRect()));
    if (mustGenerateBackground) {
	genBackground();
	mustGenerateBackground = false;
    }

    // Blit the static generated background with the hue gradient onto
    // the double buffer.
    QImage buf = bg.copy();

    // Draw the trigon
    int h,s,v;
    curColor.getHsv(&h, &s, &v);

    // Find the color with only the hue, and max value and saturation
    QColor hueColor;
    hueColor.setHsv(curHue, 255, 255);

    // Draw the triangle
    drawTrigon(&buf, pa, pb, pc, hueColor);

    // Slow step: convert the image to a pixmap
    QPixmap pix = QPixmap::fromImage(buf);
    QPainter painter(&pix);
    painter.setRenderHint(QPainter::Antialiasing);

    // Draw an outline of the triangle
    QColor halfAlpha(0, 0, 0, 128);
    painter.setPen(QPen(halfAlpha, 0));
    painter.drawLine(pa, pb);
    painter.drawLine(pb, pc);
    painter.drawLine(pc, pa);
    
    int ri, gi, bi;
    hueColor.getRgb(&ri, &gi, &bi);
    if ((ri * 30) + (gi * 59) + (bi * 11) > 12800)
	painter.setPen(QPen(Qt::black, penWidth));
    else
	painter.setPen(QPen(Qt::white, penWidth));
    painter.drawEllipse((int) (pd.x() - ellipseSize / 2.0),
			(int) (pd.y() - ellipseSize / 2.0),
			ellipseSize, ellipseSize);

    curColor.getRgb(&ri, &gi, &bi);

    // Find a color for painting the selector based on the brightness
    // value of the color.
    if ((ri * 30) + (gi * 59) + (bi * 11) > 12800)
	painter.setPen(QPen(Qt::black, penWidth));
    else
	painter.setPen(QPen(Qt::white, penWidth));

    // Draw the selector ellipse.
    painter.drawEllipse(QRectF(selectorPos.x() - ellipseSize / 2.0,