QtBase
v6.3.1
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The QRadialGradient class is used in combination with QBrush to specify a radial gradient brush. More...
#include <qbrush.h>
The QRadialGradient class is used in combination with QBrush to specify a radial gradient brush.
\inmodule QtGui
Qt supports both simple and extended radial gradients.
Simple radial gradients interpolate colors between a focal point and end points on a circle surrounding it. Extended radial gradients interpolate colors between a focal circle and a center circle. Points outside the cone defined by the two circles will be transparent. For simple radial gradients the focal point is adjusted to lie inside the center circle, whereas the focal point can have any position in an extended radial gradient.
Outside the end points the gradient is either padded, reflected or repeated depending on the currently set \l {QGradient::Spread}{spread} method:
\table \row
The colors in a gradient is defined using stop points of the QGradientStop type, i.e. a position and a color. Use the QGradient::setColorAt() or the QGradient::setStops() function to define the stop points. It is the gradient's complete set of stop points that describes how the gradient area should be filled. If no stop points have been specified, a gradient of black at 0 to white at 1 is used.
In addition to the functions inherited from QGradient, the QRadialGradient class provides the center(), focalPoint() and radius() functions returning the gradient's center, focal point and radius respectively.
QRadialGradient::QRadialGradient | ( | ) |
Constructs a simple radial gradient with the center and focal point at (0, 0) with a radius of 1.
Definition at line 2124 of file qbrush.cpp.
QRadialGradient::QRadialGradient | ( | const QPointF & | center, |
qreal | radius, | ||
const QPointF & | focalPoint | ||
) |
Constructs a simple radial gradient with the given center, radius and focalPoint.
Definition at line 2058 of file qbrush.cpp.
Constructs a simple radial gradient with the given center (cx, cy), radius and focal point (fx, fy).
Definition at line 2103 of file qbrush.cpp.
Constructs a simple radial gradient with the given center, radius and the focal point in the circle center.
Definition at line 2078 of file qbrush.cpp.
Constructs a simple radial gradient with the center at (cx, cy) and the specified radius. The focal point lies at the center of the circle.
Definition at line 2114 of file qbrush.cpp.
QRadialGradient::QRadialGradient | ( | const QPointF & | center, |
qreal | centerRadius, | ||
const QPointF & | focalPoint, | ||
qreal | focalRadius | ||
) |
Constructs an extended radial gradient with the given center, centerRadius, focalPoint, and focalRadius.
Definition at line 2142 of file qbrush.cpp.
QRadialGradient::QRadialGradient | ( | qreal | cx, |
qreal | cy, | ||
qreal | centerRadius, | ||
qreal | fx, | ||
qreal | fy, | ||
qreal | focalRadius | ||
) |
Constructs an extended radial gradient with the given center (cx, cy), center radius, centerRadius, focal point, (fx, fy), and focal radius focalRadius.
Definition at line 2163 of file qbrush.cpp.
QRadialGradient::~QRadialGradient | ( | ) |
Definition at line 2180 of file qbrush.cpp.
QPointF QRadialGradient::center | ( | ) | const |
Returns the center of this radial gradient in logical coordinates.
Definition at line 2190 of file qbrush.cpp.
qreal QRadialGradient::centerRadius | ( | ) | const |
Returns the center radius of this radial gradient in logical coordinates.
Definition at line 2261 of file qbrush.cpp.
QPointF QRadialGradient::focalPoint | ( | ) | const |
Returns the focal point of this radial gradient in logical coordinates.
Definition at line 2312 of file qbrush.cpp.
qreal QRadialGradient::focalRadius | ( | ) | const |
Returns the focal radius of this radial gradient in logical coordinates.
Definition at line 2287 of file qbrush.cpp.
qreal QRadialGradient::radius | ( | ) | const |
Returns the radius of this radial gradient in logical coordinates.
Equivalent to centerRadius()
Definition at line 2232 of file qbrush.cpp.
Sets the center of this radial gradient in logical coordinates to center.
Definition at line 2216 of file qbrush.cpp.
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
Sets the center of this radial gradient in logical coordinates to (x, y).
Definition at line 464 of file qbrush.h.
Sets the center radius of this radial gradient in logical coordinates to radius
Definition at line 2273 of file qbrush.cpp.
Sets the focal point of this radial gradient in logical coordinates to focalPoint.
Definition at line 2338 of file qbrush.cpp.
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
Sets the focal point of this radial gradient in logical coordinates to (x, y).
Definition at line 468 of file qbrush.h.
Sets the focal radius of this radial gradient in logical coordinates to radius
Definition at line 2299 of file qbrush.cpp.
Sets the radius of this radial gradient in logical coordinates to radius
Equivalent to setCenterRadius()
Definition at line 2247 of file qbrush.cpp.