The QtColorTriangle class provides a triangular color selection widget. More...
#include <qtcolortriangle.h>
Public Slots | |
| void | setColor (const QColor &col) |
Signals | |
| void | colorChanged (const QColor &col) |
Public Member Functions | |
| QtColorTriangle (QWidget *parent=0) | |
| ~QtColorTriangle () | |
| QSize | sizeHint () const |
| int | heightForWidth (int w) const |
| void | polish () |
| QColor | color () const |
Protected Member Functions | |
| void | paintEvent (QPaintEvent *) |
| void | mouseMoveEvent (QMouseEvent *) |
| void | mousePressEvent (QMouseEvent *) |
| void | mouseReleaseEvent (QMouseEvent *) |
| void | keyPressEvent (QKeyEvent *e) |
| void | resizeEvent (QResizeEvent *) |
| void | drawTrigon (QImage *p, const QPointF &a, const QPointF &b, const QPointF &c, const QColor &color) |
| void | internalSetNewColor (const QColor &color) |
Properties | |
| QColor | color |
The QtColorTriangle class provides a triangular color selection widget.
This widget uses the HSV color model, and is therefore useful for selecting colors by eye.
The triangle in the center of the widget is used for selecting saturation and value, and the surrounding circle is used for selecting hue.
Use setColor() and color() to set and get the current color.
Definition at line 79 of file qtcolortriangle.h.
| QtColorTriangle::QtColorTriangle | ( | QWidget * | parent = 0 | ) |
Constructs a color triangle widget with the given parent.
Definition at line 140 of file qtcolortriangle.cpp.
References setColor(), and QColor::setHsv().
Destructs the color triangle.
Definition at line 156 of file qtcolortriangle.cpp.
| QColor QtColorTriangle::color | ( | ) | const |
| QtColorTriangle::colorChanged | ( | const QColor & | color | ) | [signal] |
Whenever the color triangles color changes this signal is emitted with the new color.
Referenced by internalSetNewColor().
| void QtColorTriangle::drawTrigon | ( | QImage * | buf, |
| const QPointF & | pa, | ||
| const QPointF & | pb, | ||
| const QPointF & | pc, | ||
| const QColor & | color | ||
| ) | [protected] |
Draws a trigon (polygon with three corners pa, pb and pc and three edges), using painter.
Fills the trigon with a gradient, where the pa point has the color color, pb is black and bc is white. Bilinear gradient.
Definition at line 620 of file qtcolortriangle.cpp.
References QVarLengthArray::resize(), and QImage::scanLine().
Referenced by paintEvent().
| int QtColorTriangle::heightForWidth | ( | int | w | ) | const |
Forces the triangle widget to always be square. Returns the value w.
Definition at line 203 of file qtcolortriangle.cpp.
| void QtColorTriangle::internalSetNewColor | ( | const QColor & | color | ) | [protected] |
Definition at line 604 of file qtcolortriangle.cpp.
References colorChanged().
Referenced by mouseMoveEvent(), mousePressEvent(), and setColor().
| void QtColorTriangle::keyPressEvent | ( | QKeyEvent * | e | ) | [protected] |
Definition at line 443 of file qtcolortriangle.cpp.
References QColor::getHsv(), QKeyEvent::key(), QKeyEvent::modifiers(), setColor(), and QColor::setHsv().
| void QtColorTriangle::mouseMoveEvent | ( | QMouseEvent * | e | ) | [protected] |
Selects new hue or saturation/value values, depending on where the mouse button was pressed initially.
Definition at line 271 of file qtcolortriangle.cpp.
References QColor::alpha(), QMouseEvent::buttons(), QColor::getHsv(), internalSetNewColor(), PI, QMouseEvent::pos(), QColor::setHsv(), TWOPI, QPoint::x(), and QPoint::y().
| void QtColorTriangle::mousePressEvent | ( | QMouseEvent * | e | ) | [protected] |
When the left mouse button is pressed, this function determines what part of the color triangle the cursor is, and from that it initiates either selecting the hue (outside the triangle's area) or the saturation/value (inside the triangle's area).
Definition at line 352 of file qtcolortriangle.cpp.
References QColor::alpha(), QMouseEvent::button(), QColor::getHsv(), internalSetNewColor(), PI, QMouseEvent::pos(), QColor::setAlpha(), QColor::setHsv(), TWOPI, QPoint::x(), and QPoint::y().
| void QtColorTriangle::mouseReleaseEvent | ( | QMouseEvent * | e | ) | [protected] |
Stops selecting of colors with the mouse.
Definition at line 434 of file qtcolortriangle.cpp.
References QMouseEvent::button().
| void QtColorTriangle::paintEvent | ( | QPaintEvent * | e | ) | [protected] |
(reimplemented)
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.
Definition at line 538 of file qtcolortriangle.cpp.
References QImage::copy(), QPainter::drawEllipse(), QPainter::drawLine(), QPainter::drawPixmap(), drawTrigon(), QPixmap::fromImage(), QColor::getHsv(), QColor::getRgb(), QRegion::intersected(), QRect::intersects(), QPaintEvent::rect(), QPaintEvent::region(), QPainter::setClipRegion(), QColor::setHsv(), QPainter::setPen(), QPainter::setRenderHint(), QPointF::x(), and QPointF::y().
| void QtColorTriangle::polish | ( | ) |
Generates the first background image.
Definition at line 165 of file qtcolortriangle.cpp.
| void QtColorTriangle::resizeEvent | ( | QResizeEvent * | ) | [protected] |
Regenerates the background image and sends an update.
Definition at line 504 of file qtcolortriangle.cpp.
| void QtColorTriangle::setColor | ( | const QColor & | col | ) | [slot] |
Sets the color of the triangle to col.
Definition at line 820 of file qtcolortriangle.cpp.
References QColor::getHsv(), internalSetNewColor(), PI, and TWOPI.
Referenced by keyPressEvent(), and QtColorTriangle().
| QSize QtColorTriangle::sizeHint | ( | ) | const |
(reimplemented)
Definition at line 194 of file qtcolortriangle.cpp.
QColor QtColorTriangle::color [read, write] |
Returns the current color of the triangle.
Definition at line 83 of file qtcolortriangle.h.