QCanvasConicalGradient Class

QCanvasConicalGradient is a brush for conical gradient painting. More...

Header:	`#include <QCanvasConicalGradient>`
CMake:	`find_package(Qt6 REQUIRED COMPONENTS CanvasPainter)` `target_link_libraries(mytarget PRIVATE Qt6::CanvasPainter)`
Since:	Qt 6.11
Inherits:	QCanvasGradient

List of all members, including inherited members

Public Functions

	QCanvasConicalGradient()
	QCanvasConicalGradient(QPointF center, float startAngle)
	QCanvasConicalGradient(float centerX, float centerY, float startAngle)
float	angle() const
QPointF	centerPosition() const
void	setAngle(float angle)
void	setCenterPosition(float x, float y)
void	setCenterPosition(QPointF center)

Detailed Description

Conical gradient interpolate colors between start and end points around a point with given coordinates. The angle starts from a line going horizontally right from the center, and proceeds clockwise.

Here is a simple example:

QRectF rect(20, 20, 160, 160);
QCanvasConicalGradient cg(rect.center(), 1.75 * M_PI);
cg.setColorAt(0.0, "#fdbb2d");
cg.setColorAt(0.5, "#1a2a6c");
cg.setColorAt(1.0, "#fdbb2d");
p->setFillStyle(cg);
p->beginPath();
p->ellipse(rect);
p->fill();

Member Function Documentation

QCanvasConicalGradient::QCanvasConicalGradient()

Constructs a default conical gradient. Gradient center position is (0, 0). Gradient angle is 0.0. Gradient start color is white (255, 255, 255) and end color transparent black (0, 0, 0, 0).

QCanvasConicalGradient::QCanvasConicalGradient(QPointF center, float startAngle)

Constructs a conical gradient. Gradient center position is center. Gradient start angle is startAngle. Gradient start color is white (255, 255, 255) and end color transparent black (0, 0, 0, 0).

QCanvasConicalGradient::QCanvasConicalGradient(float centerX, float centerY, float startAngle)

Constructs a conical gradient. Gradient center position is ( centerX, centerY). Gradient start angle is startAngle. Gradient start color is white (255, 255, 255) and end color transparent black (0, 0, 0, 0).

float QCanvasConicalGradient::angle() const

Returns the start angle of conical gradient in radians.

See also setAngle().

QPointF QCanvasConicalGradient::centerPosition() const

Returns the center point of conical gradient.

See also setCenterPosition().

void QCanvasConicalGradient::setAngle(float angle)

Sets the start angle of conical gradient to angle in radians. The angle starts from a line going horizontally right from the center, and proceeds clockwise.

See also angle().

void QCanvasConicalGradient::setCenterPosition(float x, float y)

Sets the center point of conical gradient to ( x, y).

See also centerPosition().

void QCanvasConicalGradient::setCenterPosition(QPointF center)

Sets the center point of conical gradient to center.

This is an overloaded function.

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